//-----------------------------------------------------------------------
// <copyright file="JetApi.cs" company="Microsoft Corporation">
//     Copyright (c) Microsoft Corporation.
// </copyright>
//-----------------------------------------------------------------------

namespace Microsoft.Isam.Esent.Interop.Implementation
{
    using System;
    using System.Collections.Generic;
    using System.Diagnostics;
    using System.Globalization;
    using System.Runtime.CompilerServices;
    using System.Runtime.InteropServices;
    using System.Text;
    using System.Threading;
    using Microsoft.Isam.Esent.Interop.Server2003;
    using Microsoft.Isam.Esent.Interop.Vista;
    using Microsoft.Isam.Esent.Interop.Windows7;
    using Microsoft.Isam.Esent.Interop.Windows8;

    using Win32 = Microsoft.Isam.Esent.Interop.Win32;

    /// <summary>
    /// Calls to the ESENT interop layer. These calls take the managed types (e.g. JET_SESID) and
    /// return errors.
    /// </summary>
    internal sealed partial class JetApi : IJetApi
    {
        /// <summary>
        /// API call tracing.
        /// </summary>
        private static readonly TraceSwitch TraceSwitch = new TraceSwitch("ESENT P/Invoke", "P/Invoke calls to ESENT");

        /// <summary>
        /// The version of esent. If this is zero then it is looked up
        /// with JetGetVersion.
        /// </summary>
        private readonly uint versionOverride;

        /// <summary>
        /// Callback wrapper collection. This is used for long-running callbacks
        /// (callbacks which can be called after the API call returns). Create a
        /// wrapper here and occasionally clean them up.
        /// </summary>
        private readonly CallbackWrappers callbackWrappers = new CallbackWrappers();

#if !MANAGEDESENT_ON_WSA // Not exposed in MSDK
        /// <summary>
        /// Initializes static members of the JetApi class.
        /// </summary>
        static JetApi()
        {
            // Prepare these methods for inclusion in a constrained execution region (CER).
            // This is needed by the Instance class. Instance accesses these methods virtually
            // so RemoveUnnecessaryCode won't be able to prepare them.
            RuntimeHelpers.PrepareMethod(typeof(JetApi).GetMethod("JetCreateInstance").MethodHandle);
            RuntimeHelpers.PrepareMethod(typeof(JetApi).GetMethod("JetCreateInstance2").MethodHandle);
            RuntimeHelpers.PrepareMethod(typeof(JetApi).GetMethod("JetInit").MethodHandle);
            RuntimeHelpers.PrepareMethod(typeof(JetApi).GetMethod("JetInit2").MethodHandle);
            RuntimeHelpers.PrepareMethod(typeof(JetApi).GetMethod("JetInit3").MethodHandle);
            RuntimeHelpers.PrepareMethod(typeof(JetApi).GetMethod("JetTerm").MethodHandle);
            RuntimeHelpers.PrepareMethod(typeof(JetApi).GetMethod("JetTerm2").MethodHandle);
        }
#endif // !MANAGEDESENT_ON_WSA

        /// <summary>
        /// Initializes a new instance of the JetApi class. This allows the version
        /// to be set.
        /// </summary>
        /// <param name="version">
        /// The version of Esent. This is used to override the results of
        /// JetGetVersion.
        /// </param>
        public JetApi(uint version)
        {
#if MANAGEDESENT_ON_WSA
            // JetGetVersion isn't available in new Windows UI, so we'll pretend it's always Win8:
            this.versionOverride = 8250 << 8;
#else
            this.versionOverride = version;
#endif // MANAGEDESENT_ON_WSA
            this.DetermineCapabilities();
        }

        /// <summary>
        /// Initializes a new instance of the JetApi class.
        /// </summary>
        public JetApi()
        {
#if MANAGEDESENT_ON_WSA
            // JetGetVersion isn't available in new Windows UI, so we'll pretend it's always Win8:
            this.versionOverride = 8250 << 8;
#endif // MANAGEDESENT_ON_WSA
            this.DetermineCapabilities();
        }

        /// <summary>
        /// Gets the capabilities of this implementation of ESENT.
        /// </summary>
        public JetCapabilities Capabilities { get; private set; }

        #region Init/Term

        /// <summary>
        /// Allocates a new instance of the database engine.
        /// </summary>
        /// <param name="instance">Returns the new instance.</param>
        /// <param name="name">The name of the instance. Names must be unique.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetCreateInstance(out JET_INSTANCE instance, string name)
        {
#if MANAGEDESENT_ON_WSA
            return this.JetCreateInstance2(out instance, name, null, CreateInstanceGrbit.None);
#else
            TraceFunctionCall();
            instance.Value = IntPtr.Zero;
            if (this.Capabilities.SupportsUnicodePaths)
            {
                return Err(NativeMethods.JetCreateInstanceW(out instance.Value, name));
            }
            else
            {
                return Err(NativeMethods.JetCreateInstance(out instance.Value, name));
            }
#endif // MANAGEDESENT_ON_WSA
        }

        /// <summary>
        /// Allocate a new instance of the database engine for use in a single
        /// process, with a display name specified.
        /// </summary>
        /// <param name="instance">Returns the newly create instance.</param>
        /// <param name="name">
        /// Specifies a unique string identifier for the instance to be created.
        /// This string must be unique within a given process hosting the
        /// database engine.
        /// </param>
        /// <param name="displayName">
        /// A display name for the instance to be created. This will be used
        /// in eventlog entries.
        /// </param>
        /// <param name="grbit">Creation options.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetCreateInstance2(out JET_INSTANCE instance, string name, string displayName, CreateInstanceGrbit grbit)
        {
            TraceFunctionCall();
            instance.Value = IntPtr.Zero;

#if MANAGEDESENT_ON_WSA
            return Err(NativeMethods.JetCreateInstance2W(out instance.Value, name, displayName, (uint)grbit));
#else
            if (this.Capabilities.SupportsUnicodePaths)
            {
                return Err(NativeMethods.JetCreateInstance2W(out instance.Value, name, displayName, (uint)grbit));
            }
            else
            {
                return Err(NativeMethods.JetCreateInstance2(out instance.Value, name, displayName, (uint)grbit));
            }
#endif // MANAGEDESENT_ON_WSA
        }

        /// <summary>
        /// Initialize the ESENT database engine.
        /// </summary>
        /// <param name="instance">
        /// The instance to initialize. If an instance hasn't been
        /// allocated then a new one is created and the engine
        /// will operate in single-instance mode.
        /// </param>
        /// <returns>An error if the call fails.</returns>
        public int JetInit(ref JET_INSTANCE instance)
        {
#if MANAGEDESENT_ON_WSA
            return this.JetInit3(ref instance, null, InitGrbit.None);
#else
            TraceFunctionCall();
            return Err(NativeMethods.JetInit(ref instance.Value));
#endif // MANAGEDESENT_ON_WSA
        }

        /// <summary>
        /// Initialize the ESENT database engine.
        /// </summary>
        /// <param name="instance">
        /// The instance to initialize. If an instance hasn't been
        /// allocated then a new one is created and the engine
        /// will operate in single-instance mode.
        /// </param>
        /// <param name="grbit">
        /// Initialization options.
        /// </param>
        /// <returns>An error or a warning.</returns>
        public int JetInit2(ref JET_INSTANCE instance, InitGrbit grbit)
        {
#if MANAGEDESENT_ON_WSA
            return this.JetInit3(ref instance, null, grbit);
#else
            TraceFunctionCall();
            return Err(NativeMethods.JetInit2(ref instance.Value, (uint)grbit));
#endif // MANAGEDESENT_ON_WSA
        }

        /// <summary>
        /// Initialize the ESENT database engine.
        /// </summary>
        /// <param name="instance">
        /// The instance to initialize. If an instance hasn't been
        /// allocated then a new one is created and the engine
        /// will operate in single-instance mode.
        /// </param>
        /// <param name="recoveryOptions">
        /// Additional recovery parameters for remapping databases during
        /// recovery, position where to stop recovery at, or recovery status.
        /// </param>
        /// <param name="grbit">
        /// Initialization options.
        /// </param>
        /// <returns>An error code or warning.</returns>
        public int JetInit3(ref JET_INSTANCE instance, JET_RSTINFO recoveryOptions, InitGrbit grbit)
        {
            TraceFunctionCall();
            this.CheckSupportsVistaFeatures("JetInit3");

            if (null != recoveryOptions)
            {
                var callbackWrapper = new StatusCallbackWrapper(recoveryOptions.pfnStatus);
                NATIVE_RSTINFO rstinfo = recoveryOptions.GetNativeRstinfo();

                unsafe
                {
                    int numMaps = (null == recoveryOptions.rgrstmap) ? 0 : recoveryOptions.rgrstmap.Length;
                    try
                    {
                        NATIVE_RSTMAP* maps = stackalloc NATIVE_RSTMAP[numMaps];

                        if (numMaps > 0)
                        {
                            rstinfo.rgrstmap = maps;
                            for (int i = 0; i < numMaps; ++i)
                            {
                                rstinfo.rgrstmap[i] = recoveryOptions.rgrstmap[i].GetNativeRstmap();
                            }
                        }

                        rstinfo.pfnStatus = callbackWrapper.NativeCallback;
                        int err = Err(NativeMethods.JetInit3W(ref instance.Value, ref rstinfo, (uint)grbit));
                        callbackWrapper.ThrowSavedException();
                        return err;
                    }
                    finally
                    {
                        if (null != rstinfo.rgrstmap)
                        {
                            for (int i = 0; i < numMaps; ++i)
                            {
                                rstinfo.rgrstmap[i].FreeHGlobal();
                            }
                        }
                    }
                }
            }
            else
            {
                return Err(NativeMethods.JetInit3W(ref instance.Value, IntPtr.Zero, (uint)grbit));
            }
        }

#if !MANAGEDESENT_ON_WSA // Not exposed in MSDK
        /// <summary>
        /// Retrieves information about the instances that are running.
        /// </summary>
        /// <param name="numInstances">
        /// Returns the number of instances.
        /// </param>
        /// <param name="instances">
        /// Returns an array of instance info objects, one for each running
        /// instance.
        /// </param>
        /// <returns>An error code if the call fails.</returns>
        public int JetGetInstanceInfo(out int numInstances, out JET_INSTANCE_INFO[] instances)
        {
            TraceFunctionCall();

            unsafe
            {
                uint nativeNumInstance = 0;

                // Esent will allocate memory which will be freed by the ConvertInstanceInfos call.
                NATIVE_INSTANCE_INFO* nativeInstanceInfos = null;
                int err;
                if (this.Capabilities.SupportsUnicodePaths)
                {
                    err = NativeMethods.JetGetInstanceInfoW(out nativeNumInstance, out nativeInstanceInfos);
                    instances = this.ConvertInstanceInfosUnicode(nativeNumInstance, nativeInstanceInfos);
                }
                else
                {
                    err = NativeMethods.JetGetInstanceInfo(out nativeNumInstance, out nativeInstanceInfos);
                    instances = this.ConvertInstanceInfosAscii(nativeNumInstance, nativeInstanceInfos);
                }

                numInstances = instances.Length;

                return Err(err);
            }
        }

        /// <summary>
        /// Retrieves information about an instance.
        /// </summary>
        /// <param name="instance">The instance to get information about.</param>
        /// <param name="signature">Retrieved information.</param>
        /// <param name="infoLevel">The type of information to retrieve.</param>
        /// <returns>An error code if the call fails.</returns>
        public int JetGetInstanceMiscInfo(JET_INSTANCE instance, out JET_SIGNATURE signature, JET_InstanceMiscInfo infoLevel)
        {
            TraceFunctionCall();
            this.CheckSupportsVistaFeatures("JetGetInstanceMiscInfo");

            var nativeSignature = new NATIVE_SIGNATURE();
            int err = NativeMethods.JetGetInstanceMiscInfo(
                instance.Value,
                ref nativeSignature,
                checked((uint)NATIVE_SIGNATURE.Size),
                unchecked((uint)infoLevel));

            signature = new JET_SIGNATURE(nativeSignature);
            return Err(err);
        }

        /// <summary>
        /// Prevents streaming backup-related activity from continuing on a
        /// specific running instance, thus ending the streaming backup in
        /// a predictable way.
        /// </summary>
        /// <param name="instance">The instance to use.</param>
        /// <returns>An error code.</returns>
        public int JetStopBackupInstance(JET_INSTANCE instance)
        {
            TraceFunctionCall();
            return Err(NativeMethods.JetStopBackupInstance(instance.Value));
        }

        /// <summary>
        /// Prepares an instance for termination.
        /// </summary>
        /// <param name="instance">The (running) instance to use.</param>
        /// <returns>An error code.</returns>
        public int JetStopServiceInstance(JET_INSTANCE instance)
        {
            TraceFunctionCall();
            return Err(NativeMethods.JetStopServiceInstance(instance.Value));
        }
#endif // !MANAGEDESENT_ON_WSA

        /// <summary>
        /// Prepares an instance for termination. Can also be used to resume a previous quiescing.
        /// </summary>
        /// <param name="instance">The (running) instance to use.</param>
        /// <param name="grbit">The options to stop or resume the instance.</param>
        /// <returns>An error code.</returns>
        public int JetStopServiceInstance2(
            JET_INSTANCE instance,
            StopServiceGrbit grbit)
        {
            TraceFunctionCall();
            this.CheckSupportsWindows8Features("JetStopServiceInstance2");
            return Err(NativeMethods.JetStopServiceInstance2(instance.Value, unchecked((uint)grbit)));
        }

        /// <summary>
        /// Terminate an instance that was created with <see cref="IJetApi.JetInit"/> or
        /// <see cref="IJetApi.JetCreateInstance"/>.
        /// </summary>
        /// <param name="instance">The instance to terminate.</param>
        /// <returns>An error or warning.</returns>
        public int JetTerm(JET_INSTANCE instance)
        {
#if MANAGEDESENT_ON_WSA
            return this.JetTerm2(instance, TermGrbit.None);
#else
            TraceFunctionCall();
            this.callbackWrappers.Collect();
            if (!instance.IsInvalid)
            {
                return Err(NativeMethods.JetTerm(instance.Value));
            }

            return (int)JET_err.Success;
#endif // MANAGEDESENT_ON_WSA
        }

        /// <summary>
        /// Terminate an instance that was created with <see cref="IJetApi.JetInit"/> or
        /// <see cref="IJetApi.JetCreateInstance"/>.
        /// </summary>
        /// <param name="instance">The instance to terminate.</param>
        /// <param name="grbit">Termination options.</param>
        /// <returns>An error or warning.</returns>
        public int JetTerm2(JET_INSTANCE instance, TermGrbit grbit)
        {
            TraceFunctionCall();
            this.callbackWrappers.Collect();
            if (!instance.IsInvalid)
            {
                return Err(NativeMethods.JetTerm2(instance.Value, (uint)grbit));
            }

            return (int)JET_err.Success;
        }

        /// <summary>
        /// Sets database configuration options.
        /// </summary>
        /// <param name="instance">
        /// The instance to set the option on or <see cref="JET_INSTANCE.Nil"/>
        /// to set the option on all instances.
        /// </param>
        /// <param name="sesid">The session to use.</param>
        /// <param name="paramid">The parameter to set.</param>
        /// <param name="paramValue">The value of the parameter to set, if the parameter is an integer type.</param>
        /// <param name="paramString">The value of the parameter to set, if the parameter is a string type.</param>
        /// <returns>An error or warning.</returns>
        public int JetSetSystemParameter(JET_INSTANCE instance, JET_SESID sesid, JET_param paramid, IntPtr paramValue, string paramString)
        {
            TraceFunctionCall();
            unsafe
            {
                IntPtr* pinstance = (IntPtr.Zero == instance.Value) ? null : &instance.Value;
                if (this.Capabilities.SupportsUnicodePaths)
                {
                    return Err(NativeMethods.JetSetSystemParameterW(pinstance, sesid.Value, (uint)paramid, paramValue, paramString));
                }

#if MANAGEDESENT_ON_WSA
                return Err((int)JET_err.FeatureNotAvailable);
#else
                return Err(NativeMethods.JetSetSystemParameter(pinstance, sesid.Value, (uint)paramid, paramValue, paramString));
#endif // MANAGEDESENT_ON_WSA
            }
        }

        /// <summary>
        /// Sets database configuration options. This overload is used when the
        /// parameter being set is of type JET_CALLBACK.
        /// </summary>
        /// <param name="instance">
        /// The instance to set the option on or <see cref="JET_INSTANCE.Nil"/>
        /// to set the option on all instances.
        /// </param>
        /// <param name="sesid">The session to use.</param>
        /// <param name="paramid">The parameter to set.</param>
        /// <param name="paramValue">The value of the parameter to set.</param>
        /// <param name="paramString">The value of the string parameter to set.</param>
        /// <returns>An error or warning.</returns>
        public int JetSetSystemParameter(JET_INSTANCE instance, JET_SESID sesid, JET_param paramid, JET_CALLBACK paramValue, string paramString)
        {
            TraceFunctionCall();

            unsafe
            {
                // We are interested in the callback, not the string so we always use the ASCII API.
                IntPtr* pinstance = (IntPtr.Zero == instance.Value) ? null : &instance.Value;

                if (null == paramValue)
                {
                    return
                        Err(
#if MANAGEDESENT_ON_WSA
                            NativeMethods.JetSetSystemParameterW(
                                pinstance,
                                sesid.Value,
                                (uint)paramid,
                                IntPtr.Zero,
                                paramString));
#else
                            NativeMethods.JetSetSystemParameter(
                                pinstance,
                                sesid.Value,
                                (uint)paramid,
                                IntPtr.Zero,
                                paramString));
#endif // MANAGEDESENT_ON_WSA
                }

                JetCallbackWrapper wrapper = this.callbackWrappers.Add(paramValue);
                this.callbackWrappers.Collect();
                IntPtr functionPointer = Marshal.GetFunctionPointerForDelegate(wrapper.NativeCallback);
#if DEBUG
                GC.Collect();
#endif // DEBUG
#if MANAGEDESENT_ON_WSA
                return Err(
                        NativeMethods.JetSetSystemParameterW(
                            pinstance,
                            sesid.Value,
                            (uint)paramid,
                            functionPointer,
                            paramString));
#else
                return Err(
                        NativeMethods.JetSetSystemParameter(
                            pinstance,
                            sesid.Value,
                            (uint)paramid,
                            functionPointer,
                            paramString));
#endif // MANAGEDESENT_ON_WSA
            }
        }

        /// <summary>
        /// Gets database configuration options.
        /// </summary>
        /// <param name="instance">The instance to retrieve the options from.</param>
        /// <param name="sesid">The session to use.</param>
        /// <param name="paramid">The parameter to get.</param>
        /// <param name="paramValue">Returns the value of the parameter, if the value is an integer.</param>
        /// <param name="paramString">Returns the value of the parameter, if the value is a string.</param>
        /// <param name="maxParam">The maximum size of the parameter string.</param>
        /// <returns>An ESENT warning code.</returns>
        /// <remarks>
        /// <see cref="JET_param.ErrorToString"/> passes in the error number in the paramValue, which is why it is
        /// a ref parameter and not an out parameter.
        /// </remarks>
        /// <returns>An error or warning.</returns>
        public int JetGetSystemParameter(JET_INSTANCE instance, JET_SESID sesid, JET_param paramid, ref IntPtr paramValue, out string paramString, int maxParam)
        {
            TraceFunctionCall();
            CheckNotNegative(maxParam, "maxParam");

            uint bytesMax = checked((uint)(this.Capabilities.SupportsUnicodePaths ? maxParam * sizeof(char) : maxParam));

            var sb = new StringBuilder(maxParam);
            int err;
            if (this.Capabilities.SupportsUnicodePaths)
            {
                err = Err(NativeMethods.JetGetSystemParameterW(instance.Value, sesid.Value, (uint)paramid, ref paramValue, sb, bytesMax));
            }
            else
            {
#if MANAGEDESENT_ON_WSA
                err = Err((int)JET_err.FeatureNotAvailable);
#else
                err = Err(NativeMethods.JetGetSystemParameter(instance.Value, sesid.Value, (uint)paramid, ref paramValue, sb, bytesMax));
#endif
            }

            paramString = sb.ToString();
            paramString = StringCache.TryToIntern(paramString);
            return err;
        }

#if !MANAGEDESENT_ON_WSA // Not exposed in MSDK
        /// <summary>
        /// Retrieves the version of the database engine.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="version">Returns the version number of the database engine.</param>
        /// <returns>An error code if the call fails.</returns>
        public int JetGetVersion(JET_SESID sesid, out uint version)
        {
            TraceFunctionCall();
            uint nativeVersion;
            int err;

            if (0 != this.versionOverride)
            {
                // We have an explicitly set version
                Trace.WriteLineIf(
                    TraceSwitch.TraceVerbose, string.Format(CultureInfo.InvariantCulture, "JetGetVersion overridden with 0x{0:X}", this.versionOverride));
                nativeVersion = this.versionOverride;
                err = 0;
            }
            else
            {
                // Get the version from Esent
                err = Err(NativeMethods.JetGetVersion(sesid.Value, out nativeVersion));
            }

            version = nativeVersion;
            return err;
        }
#endif // !MANAGEDESENT_ON_WSA
        #endregion

        #region Databases

        /// <summary>
        /// Creates and attaches a database file.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="database">The path to the database file to create.</param>
        /// <param name="connect">The parameter is not used.</param>
        /// <param name="dbid">Returns the dbid of the new database.</param>
        /// <param name="grbit">Database creation options.</param>
        /// <returns>An error or warning.</returns>
        public int JetCreateDatabase(JET_SESID sesid, string database, string connect, out JET_DBID dbid, CreateDatabaseGrbit grbit)
        {
#if MANAGEDESENT_ON_WSA
            return this.JetCreateDatabase2(sesid, database, 0, out dbid, grbit);
#else
            TraceFunctionCall();
            CheckNotNull(database, "database");

            dbid = JET_DBID.Nil;
            if (this.Capabilities.SupportsUnicodePaths)
            {
                return Err(NativeMethods.JetCreateDatabaseW(sesid.Value, database, connect, out dbid.Value, (uint)grbit));
            }

            return Err(NativeMethods.JetCreateDatabase(sesid.Value, database, connect, out dbid.Value, (uint)grbit));
#endif // MANAGEDESENT_ON_WSA
        }

        /// <summary>
        /// Creates and attaches a database file with a maximum database size specified.
        /// <seealso cref="JetAttachDatabase2"/>.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="database">The path to the database file to create.</param>
        /// <param name="maxPages">
        /// The maximum size, in database pages, of the database. Passing 0 means there is
        /// no enforced maximum.
        /// </param>
        /// <param name="dbid">Returns the dbid of the new database.</param>
        /// <param name="grbit">Database creation options.</param>
        /// <returns>An error or warning.</returns>
        public int JetCreateDatabase2(JET_SESID sesid, string database, int maxPages, out JET_DBID dbid, CreateDatabaseGrbit grbit)
        {
            TraceFunctionCall();
            CheckNotNull(database, "database");
            CheckNotNegative(maxPages, "maxPages");

            dbid = JET_DBID.Nil;
            uint cpgDatabaseSizeMax = checked((uint)maxPages);
            if (this.Capabilities.SupportsUnicodePaths)
            {
                return Err(NativeMethods.JetCreateDatabase2W(sesid.Value, database, cpgDatabaseSizeMax, out dbid.Value, (uint)grbit));
            }

#if MANAGEDESENT_ON_WSA
            return Err((int)JET_err.FeatureNotAvailable);
#else
            return Err(NativeMethods.JetCreateDatabase2(sesid.Value, database, cpgDatabaseSizeMax, out dbid.Value, (uint)grbit));
#endif
        }

        /// <summary>
        /// Attaches a database file for use with a database instance. In order to use the
        /// database, it will need to be subsequently opened with <see cref="IJetApi.JetOpenDatabase"/>.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="database">The database to attach.</param>
        /// <param name="grbit">Attach options.</param>
        /// <returns>An error or warning.</returns>
        public int JetAttachDatabase(JET_SESID sesid, string database, AttachDatabaseGrbit grbit)
        {
#if MANAGEDESENT_ON_WSA
            return this.JetAttachDatabase2(sesid, database, 0, grbit);
#else
            TraceFunctionCall();
            CheckNotNull(database, "database");

            if (this.Capabilities.SupportsUnicodePaths)
            {
                return Err(NativeMethods.JetAttachDatabaseW(sesid.Value, database, (uint)grbit));
            }

            return Err(NativeMethods.JetAttachDatabase(sesid.Value, database, (uint)grbit));
#endif // MANAGEDESENT_ON_WSA
        }

        /// <summary>
        /// Attaches a database file for use with a database instance. In order to use the
        /// database, it will need to be subsequently opened with <see cref="JetOpenDatabase"/>.
        /// <seealso cref="JetCreateDatabase2"/>.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="database">The database to attach.</param>
        /// <param name="maxPages">
        /// The maximum size, in database pages, of the database. Passing 0 means there is
        /// no enforced maximum.
        /// </param>
        /// <param name="grbit">Attach options.</param>
        /// <returns>An error or warning.</returns>
        public int JetAttachDatabase2(JET_SESID sesid, string database, int maxPages, AttachDatabaseGrbit grbit)
        {
            TraceFunctionCall();
            CheckNotNull(database, "database");
            CheckNotNegative(maxPages, "maxPages");

            if (this.Capabilities.SupportsUnicodePaths)
            {
                return Err(NativeMethods.JetAttachDatabase2W(sesid.Value, database, checked((uint)maxPages), (uint)grbit));
            }

#if MANAGEDESENT_ON_WSA
            return Err((int)JET_err.FeatureNotAvailable);
#else
            return Err(NativeMethods.JetAttachDatabase2(sesid.Value, database, checked((uint)maxPages), (uint)grbit));
#endif
        }

        /// <summary>
        /// Opens a database previously attached with <see cref="IJetApi.JetAttachDatabase"/>,
        /// for use with a database session. This function can be called multiple times
        /// for the same database.
        /// </summary>
        /// <param name="sesid">The session that is opening the database.</param>
        /// <param name="database">The database to open.</param>
        /// <param name="connect">Reserved for future use.</param>
        /// <param name="dbid">Returns the dbid of the attached database.</param>
        /// <param name="grbit">Open database options.</param>
        /// <returns>An error or warning.</returns>
        public int JetOpenDatabase(JET_SESID sesid, string database, string connect, out JET_DBID dbid, OpenDatabaseGrbit grbit)
        {
            TraceFunctionCall();
            CheckNotNull(database, "database");
            dbid = JET_DBID.Nil;

            if (this.Capabilities.SupportsUnicodePaths)
            {
                return Err(NativeMethods.JetOpenDatabaseW(sesid.Value, database, connect, out dbid.Value, (uint)grbit));
            }

#if MANAGEDESENT_ON_WSA
            return Err((int)JET_err.FeatureNotAvailable);
#else
            return Err(NativeMethods.JetOpenDatabase(sesid.Value, database, connect, out dbid.Value, (uint)grbit));
#endif
        }

        /// <summary>
        /// Closes a database file that was previously opened with <see cref="IJetApi.JetOpenDatabase"/> or
        /// created with <see cref="IJetApi.JetCreateDatabase"/>.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="dbid">The database to close.</param>
        /// <param name="grbit">Close options.</param>
        /// <returns>An error or warning.</returns>
        public int JetCloseDatabase(JET_SESID sesid, JET_DBID dbid, CloseDatabaseGrbit grbit)
        {
            TraceFunctionCall();
            return Err(NativeMethods.JetCloseDatabase(sesid.Value, dbid.Value, (uint)grbit));
        }

        /// <summary>
        /// Releases a database file that was previously attached to a database session.
        /// </summary>
        /// <param name="sesid">The database session to use.</param>
        /// <param name="database">The database to detach.</param>
        /// <returns>An error or warning.</returns>
        public int JetDetachDatabase(JET_SESID sesid, string database)
        {
            TraceFunctionCall();

#if MANAGEDESENT_ON_WSA
            return this.JetDetachDatabase2(sesid, database, DetachDatabaseGrbit.None);
#else
            if (this.Capabilities.SupportsUnicodePaths)
            {
                return Err(NativeMethods.JetDetachDatabaseW(sesid.Value, database));
            }

            return Err(NativeMethods.JetDetachDatabase(sesid.Value, database));
#endif // MANAGEDESENT_ON_WSA
        }

        /// <summary>
        /// Releases a database file that was previously attached to a database session.
        /// </summary>
        /// <param name="sesid">The database session to use.</param>
        /// <param name="database">The database to detach.</param>
        /// <param name="grbit">Detach options.</param>
        /// <returns>An error or warning.</returns>
        public int JetDetachDatabase2(JET_SESID sesid, string database, DetachDatabaseGrbit grbit)
        {
            TraceFunctionCall();

            if (this.Capabilities.SupportsUnicodePaths)
            {
                return Err(NativeMethods.JetDetachDatabase2W(sesid.Value, database, (uint)grbit));
            }

#if MANAGEDESENT_ON_WSA
            return Err((int)JET_err.FeatureNotAvailable);
#else
            return Err(NativeMethods.JetDetachDatabase2(sesid.Value, database, (uint)grbit));
#endif
        }

#if !MANAGEDESENT_ON_WSA // Not exposed in MSDK
        /// <summary>
        /// Makes a copy of an existing database. The copy is compacted to a
        /// state optimal for usage. Data in the copied data will be packed
        /// according to the measures chosen for the indexes at index create.
        /// In this way, compacted data may be stored as densely as possible.
        /// Alternatively, compacted data may reserve space for subsequent
        /// record growth or index insertions.
        /// </summary>
        /// <param name="sesid">The session to use for the call.</param>
        /// <param name="sourceDatabase">The source database that will be compacted.</param>
        /// <param name="destinationDatabase">The name to use for the compacted database.</param>
        /// <param name="statusCallback">
        /// A callback function that can be called periodically through the
        /// database compact operation to report progress.
        /// </param>
        /// <param name="ignored">
        /// This parameter is ignored and should be null.
        /// </param>
        /// <param name="grbit">Compact options.</param>
        /// <returns>An error code.</returns>
        public int JetCompact(
            JET_SESID sesid,
            string sourceDatabase,
            string destinationDatabase,
            JET_PFNSTATUS statusCallback,
            object ignored,
            CompactGrbit grbit)
        {
            TraceFunctionCall();
            CheckNotNull(sourceDatabase, "sourceDatabase");
            CheckNotNull(destinationDatabase, "destinationDatabase");
            if (null != ignored)
            {
                throw new ArgumentException("must be null", "ignored");
            }

            var callbackWrapper = new StatusCallbackWrapper(statusCallback);
            IntPtr functionPointer = (null == statusCallback) ? IntPtr.Zero : Marshal.GetFunctionPointerForDelegate(callbackWrapper.NativeCallback);
#if DEBUG
            GC.Collect();
#endif

            int err;
            if (this.Capabilities.SupportsUnicodePaths)
            {
                err = Err(NativeMethods.JetCompactW(
                            sesid.Value, sourceDatabase, destinationDatabase, functionPointer, IntPtr.Zero, (uint)grbit));
            }
            else
            {
                err = Err(NativeMethods.JetCompact(
                            sesid.Value, sourceDatabase, destinationDatabase, functionPointer, IntPtr.Zero, (uint)grbit));
            }

            callbackWrapper.ThrowSavedException();
            return err;
        }

        /// <summary>
        /// Extends the size of a database that is currently open.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="dbid">The database to grow.</param>
        /// <param name="desiredPages">The desired size of the database, in pages.</param>
        /// <param name="actualPages">
        /// The size of the database, in pages, after the call.
        /// </param>
        /// <returns>An error if the call fails.</returns>
        public int JetGrowDatabase(JET_SESID sesid, JET_DBID dbid, int desiredPages, out int actualPages)
        {
            TraceFunctionCall();
            CheckNotNegative(desiredPages, "desiredPages");

            uint actualPagesNative = 0;
            int err = Err(NativeMethods.JetGrowDatabase(
                        sesid.Value, dbid.Value, checked((uint)desiredPages), out actualPagesNative));
            actualPages = checked((int)actualPagesNative);
            return err;
        }

        /// <summary>
        /// Extends the size of a database that is currently open.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="database">The name of the database to grow.</param>
        /// <param name="desiredPages">The desired size of the database, in pages.</param>
        /// <param name="actualPages">
        /// The size of the database, in pages, after the call.
        /// </param>
        /// <returns>An error if the call fails.</returns>
        public int JetSetDatabaseSize(JET_SESID sesid, string database, int desiredPages, out int actualPages)
        {
            TraceFunctionCall();
            CheckNotNegative(desiredPages, "desiredPages");
            CheckNotNull(database, "database");

            uint actualPagesNative = 0;
            int err;
            if (this.Capabilities.SupportsUnicodePaths)
            {
                err = Err(NativeMethods.JetSetDatabaseSizeW(
                            sesid.Value, database, checked((uint)desiredPages), out actualPagesNative));
            }
            else
            {
                err = Err(NativeMethods.JetSetDatabaseSize(
                            sesid.Value, database, checked((uint)desiredPages), out actualPagesNative));
            }

            actualPages = checked((int)actualPagesNative);
            return err;
        }
#endif // !MANAGEDESENT_ON_WSA

        /// <summary>
        /// Retrieves certain information about the given database.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="dbid">The database identifier.</param>
        /// <param name="value">The value to be retrieved.</param>
        /// <param name="infoLevel">The specific data to retrieve.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetGetDatabaseInfo(
            JET_SESID sesid,
            JET_DBID dbid,
            out int value,
            JET_DbInfo infoLevel)
        {
            TraceFunctionCall();
#if MANAGEDESENT_ON_WSA
            return Err(NativeMethods.JetGetDatabaseInfoW(sesid.Value, dbid.Value, out value, sizeof(int), (uint)infoLevel));
#else
            return Err(NativeMethods.JetGetDatabaseInfo(sesid.Value, dbid.Value, out value, sizeof(int), (uint)infoLevel));
#endif
        }

        /// <summary>
        /// Retrieves certain information about the given database.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="dbid">The database identifier.</param>
        /// <param name="dbinfomisc">The value to be retrieved.</param>
        /// <param name="infoLevel">The specific data to retrieve.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetGetDatabaseInfo(
            JET_SESID sesid,
            JET_DBID dbid,
            out JET_DBINFOMISC dbinfomisc,
            JET_DbInfo infoLevel)
        {
            TraceFunctionCall();
            int err = (int)JET_err.Success;
            dbinfomisc = null;

            bool notYetPublishedSupported = false;
            this.NotYetPublishedGetDbinfomisc(sesid, dbid, ref dbinfomisc, infoLevel, ref notYetPublishedSupported, ref err);

            if (notYetPublishedSupported)
            {
                // The not-yet-published function in the other file set the 'ref' parameters.
            }
            else if (this.Capabilities.SupportsWindows7Features)
            {
                NATIVE_DBINFOMISC4 native;
                err = Err(NativeMethods.JetGetDatabaseInfoW(
                    sesid.Value,
                    dbid.Value,
                    out native,
                    (uint)Marshal.SizeOf(typeof(NATIVE_DBINFOMISC4)),
                    (uint)infoLevel));

                dbinfomisc = new JET_DBINFOMISC();
                dbinfomisc.SetFromNativeDbinfoMisc(ref native);
            }
#if MANAGEDESENT_ON_WSA
            else
            {
                var native = new NATIVE_DBINFOMISC4();
                err = Err((int)JET_err.FeatureNotAvailable);

                dbinfomisc = new JET_DBINFOMISC();
                dbinfomisc.SetFromNativeDbinfoMisc(ref native);
            }
#else
            else if (this.Capabilities.SupportsVistaFeatures)
            {
                NATIVE_DBINFOMISC native;
                err = Err(NativeMethods.JetGetDatabaseInfoW(
                    sesid.Value,
                    dbid.Value,
                    out native,
                    (uint)Marshal.SizeOf(typeof(NATIVE_DBINFOMISC)),
                    (uint)infoLevel));

                dbinfomisc = new JET_DBINFOMISC();
                dbinfomisc.SetFromNativeDbinfoMisc(ref native);
            }
            else
            {
                NATIVE_DBINFOMISC native;
                err = Err(NativeMethods.JetGetDatabaseInfo(
                    sesid.Value,
                    dbid.Value,
                    out native,
                    (uint)Marshal.SizeOf(typeof(NATIVE_DBINFOMISC)),
                    (uint)infoLevel));
                dbinfomisc = new JET_DBINFOMISC();
                dbinfomisc.SetFromNativeDbinfoMisc(ref native);
            }
#endif // MANAGEDESENT_ON_WSA

            return err;
        }

        /// <summary>
        /// Retrieves certain information about the given database.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="dbid">The database identifier.</param>
        /// <param name="value">The value to be retrieved.</param>
        /// <param name="infoLevel">The specific data to retrieve.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetGetDatabaseInfo(
            JET_SESID sesid,
            JET_DBID dbid,
            out string value,
            JET_DbInfo infoLevel)
        {
            TraceFunctionCall();
            int err;

            const int MaxCharacters = 1024;
            StringBuilder sb = new StringBuilder(MaxCharacters);
            if (this.Capabilities.SupportsUnicodePaths)
            {
                err = Err(NativeMethods.JetGetDatabaseInfoW(sesid.Value, dbid.Value, sb, MaxCharacters, (uint)infoLevel));
            }
            else
            {
#if MANAGEDESENT_ON_WSA
                err = Err((int)JET_err.FeatureNotAvailable);
#else
                err = Err(NativeMethods.JetGetDatabaseInfo(sesid.Value, dbid.Value, sb, MaxCharacters, (uint)infoLevel));
#endif
            }

            value = sb.ToString();
            return err;
        }

        /// <summary>
        /// Retrieves certain information about the given database.
        /// </summary>
        /// <param name="databaseName">The file name of the database.</param>
        /// <param name="value">The value to be retrieved.</param>
        /// <param name="infoLevel">The specific data to retrieve.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetGetDatabaseFileInfo(
            string databaseName,
            out int value,
            JET_DbInfo infoLevel)
        {
            TraceFunctionCall();
            int err;

            if (this.Capabilities.SupportsUnicodePaths)
            {
                err = Err(NativeMethods.JetGetDatabaseFileInfoW(databaseName, out value, sizeof(int), (uint)infoLevel));
            }
            else
            {
#if MANAGEDESENT_ON_WSA
                err = Err((int)JET_err.FeatureNotAvailable);
                value = 0;
#else
                err = Err(NativeMethods.JetGetDatabaseFileInfo(databaseName, out value, sizeof(int), (uint)infoLevel));
#endif
            }

            return err;
        }

        /// <summary>
        /// Retrieves certain information about the given database.
        /// </summary>
        /// <param name="databaseName">The file name of the database.</param>
        /// <param name="value">The value to be retrieved.</param>
        /// <param name="infoLevel">The specific data to retrieve.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetGetDatabaseFileInfo(
            string databaseName,
            out long value,
            JET_DbInfo infoLevel)
        {
            TraceFunctionCall();
            int err;

            if (this.Capabilities.SupportsUnicodePaths)
            {
                err = Err(NativeMethods.JetGetDatabaseFileInfoW(databaseName, out value, sizeof(long), (uint)infoLevel));
            }
            else
            {
#if MANAGEDESENT_ON_WSA
                err = Err((int)JET_err.FeatureNotAvailable);
                value = 0;
#else
                err = Err(NativeMethods.JetGetDatabaseFileInfo(databaseName, out value, sizeof(long), (uint)infoLevel));
#endif
            }

            return err;
        }

        /// <summary>
        /// Retrieves certain information about the given database.
        /// </summary>
        /// <param name="databaseName">The file name of the database.</param>
        /// <param name="dbinfomisc">The value to be retrieved.</param>
        /// <param name="infoLevel">The specific data to retrieve.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetGetDatabaseFileInfo(
            string databaseName,
            out JET_DBINFOMISC dbinfomisc,
            JET_DbInfo infoLevel)
        {
            TraceFunctionCall();
            int err = (int)JET_err.Success;
            dbinfomisc = null;

            bool notYetPublishedSupported = false;
            this.NotYetPublishedGetDbinfomisc(databaseName, ref dbinfomisc, infoLevel, ref notYetPublishedSupported, ref err);

            if (notYetPublishedSupported)
            {
                // The not-yet-published function in the other file set the 'ref' parameters.
            }
            else if (this.Capabilities.SupportsWindows7Features)
            {
                // Windows7 -> Unicode path support
                NATIVE_DBINFOMISC4 native;
                err = Err(NativeMethods.JetGetDatabaseFileInfoW(databaseName, out native, (uint)Marshal.SizeOf(typeof(NATIVE_DBINFOMISC4)), (uint)infoLevel));

                dbinfomisc = new JET_DBINFOMISC();
                dbinfomisc.SetFromNativeDbinfoMisc(ref native);
            }
#if MANAGEDESENT_ON_WSA
            else
            {
                err = Err((int)JET_err.FeatureNotAvailable);
                var native = new NATIVE_DBINFOMISC4();
                dbinfomisc = new JET_DBINFOMISC();
                dbinfomisc.SetFromNativeDbinfoMisc(ref native);
            }
#else
            else
            {
                NATIVE_DBINFOMISC native;
                if (this.Capabilities.SupportsUnicodePaths)
                {
                    err = Err(NativeMethods.JetGetDatabaseFileInfoW(databaseName, out native, (uint)Marshal.SizeOf(typeof(NATIVE_DBINFOMISC)), (uint)infoLevel));
                }
                else
                {
                    err = Err(NativeMethods.JetGetDatabaseFileInfo(databaseName, out native, (uint)Marshal.SizeOf(typeof(NATIVE_DBINFOMISC)), (uint)infoLevel));
                }

                dbinfomisc = new JET_DBINFOMISC();
                dbinfomisc.SetFromNativeDbinfoMisc(ref native);
            }
#endif // MANAGEDESENT_ON_WSA

            return err;
        }

        #endregion

        #region Backup/Restore

#if !MANAGEDESENT_ON_WSA
        /// <summary>
        /// Performs a streaming backup of an instance, including all the attached
        /// databases, to a directory. With multiple backup methods supported by
        /// the engine, this is the simplest and most encapsulated function.
        /// </summary>
        /// <param name="instance">The instance to backup.</param>
        /// <param name="destination">
        /// The directory where the backup is to be stored. If the backup path is
        /// null to use the function will truncate the logs, if possible.
        /// </param>
        /// <param name="grbit">Backup options.</param>
        /// <param name="statusCallback">
        /// Optional status notification callback.
        /// </param>
        /// <returns>An error code.</returns>
        public int JetBackupInstance(
            JET_INSTANCE instance, string destination, BackupGrbit grbit, JET_PFNSTATUS statusCallback)
        {
            TraceFunctionCall();

            var callbackWrapper = new StatusCallbackWrapper(statusCallback);
            IntPtr functionPointer = (null == statusCallback) ? IntPtr.Zero : Marshal.GetFunctionPointerForDelegate(callbackWrapper.NativeCallback);
#if DEBUG
            GC.Collect();
#endif
            int err;
            if (this.Capabilities.SupportsUnicodePaths)
            {
                err = Err(NativeMethods.JetBackupInstanceW(instance.Value, destination, (uint)grbit, functionPointer));
            }
            else
            {
                err = Err(NativeMethods.JetBackupInstance(instance.Value, destination, (uint)grbit, functionPointer));
            }

            callbackWrapper.ThrowSavedException();
            return err;
        }

        /// <summary>
        /// Restores and recovers a streaming backup of an instance including all
        /// the attached databases. It is designed to work with a backup created
        /// with the <see cref="Api.JetBackupInstance"/> function. This is the
        /// simplest and most encapsulated restore function.
        /// </summary>
        /// <param name="instance">The instance to use.</param>
        /// <param name="source">
        /// Location of the backup. The backup should have been created with
        /// <see cref="Api.JetBackupInstance"/>.
        /// </param>
        /// <param name="destination">
        /// Name of the folder where the database files from the backup set will
        /// be copied and recovered. If this is set to null, the database files
        /// will be copied and recovered to their original location.
        /// </param>
        /// <param name="statusCallback">
        /// Optional status notification callback.
        /// </param>
        /// <returns>An error code.</returns>
        public int JetRestoreInstance(JET_INSTANCE instance, string source, string destination, JET_PFNSTATUS statusCallback)
        {
            TraceFunctionCall();
            CheckNotNull(source, "source");

            var callbackWrapper = new StatusCallbackWrapper(statusCallback);
            IntPtr functionPointer = (null == statusCallback) ? IntPtr.Zero : Marshal.GetFunctionPointerForDelegate(callbackWrapper.NativeCallback);
#if DEBUG
            GC.Collect();
#endif

            int err;
            if (this.Capabilities.SupportsUnicodePaths)
            {
                err = Err(NativeMethods.JetRestoreInstanceW(instance.Value, source, destination, functionPointer));
            }
            else
            {
                err = Err(NativeMethods.JetRestoreInstance(instance.Value, source, destination, functionPointer));
            }

            callbackWrapper.ThrowSavedException();
            return err;
        }
#endif // !MANAGEDESENT_ON_WSA
        #endregion

        #region Snapshot Backup

#if !MANAGEDESENT_ON_WSA

        /// <summary>
        /// Begins the preparations for a snapshot session. A snapshot session
        /// is a short time interval in which the engine does not issue any
        /// write IOs to disk, so that the engine can participate in a volume
        /// snapshot session (when driven by a snapshot writer).
        /// </summary>
        /// <param name="snapid">Returns the ID of the snapshot session.</param>
        /// <param name="grbit">Snapshot options.</param>
        /// <returns>An error code if the call fails.</returns>
        public int JetOSSnapshotPrepare(out JET_OSSNAPID snapid, SnapshotPrepareGrbit grbit)
        {
            TraceFunctionCall();
            snapid = JET_OSSNAPID.Nil;
            return Err(NativeMethods.JetOSSnapshotPrepare(out snapid.Value, (uint)grbit));
        }

        /// <summary>
        /// Selects a specific instance to be part of the snapshot session.
        /// </summary>
        /// <param name="snapshot">The snapshot identifier.</param>
        /// <param name="instance">The instance to add to the snapshot.</param>
        /// <param name="grbit">Options for this call.</param>
        /// <returns>An error code if the call fails.</returns>
        public int JetOSSnapshotPrepareInstance(JET_OSSNAPID snapshot, JET_INSTANCE instance, SnapshotPrepareInstanceGrbit grbit)
        {
            TraceFunctionCall();
            this.CheckSupportsVistaFeatures("JetOSSnapshotPrepareInstance");
            return Err(NativeMethods.JetOSSnapshotPrepareInstance(snapshot.Value, instance.Value, (uint)grbit));
        }

        /// <summary>
        /// Starts a snapshot. While the snapshot is in progress, no
        /// write-to-disk activity by the engine can take place.
        /// </summary>
        /// <param name="snapshot">The snapshot session.</param>
        /// <param name="numInstances">
        /// Returns the number of instances that are part of the snapshot session.
        /// </param>
        /// <param name="instances">
        /// Returns information about the instances that are part of the snapshot session.
        /// </param>
        /// <param name="grbit">
        /// Snapshot freeze options.
        /// </param>
        /// <returns>An error code if the call fails.</returns>
        public int JetOSSnapshotFreeze(JET_OSSNAPID snapshot, out int numInstances, out JET_INSTANCE_INFO[] instances, SnapshotFreezeGrbit grbit)
        {
            TraceFunctionCall();

            unsafe
            {
                uint nativeNumInstance = 0;
                NATIVE_INSTANCE_INFO* nativeInstanceInfos = null;
                int err;
                if (this.Capabilities.SupportsUnicodePaths)
                {
                    err = NativeMethods.JetOSSnapshotFreezeW(snapshot.Value, out nativeNumInstance, out nativeInstanceInfos, (uint)grbit);
                    instances = this.ConvertInstanceInfosUnicode(nativeNumInstance, nativeInstanceInfos);
                }
                else
                {
                    err = NativeMethods.JetOSSnapshotFreeze(snapshot.Value, out nativeNumInstance, out nativeInstanceInfos, (uint)grbit);
                    instances = this.ConvertInstanceInfosAscii(nativeNumInstance, nativeInstanceInfos);
                }

                numInstances = instances.Length;

                return Err(err);
            }
        }

        /// <summary>
        /// Retrieves the list of instances and databases that are part of the
        /// snapshot session at any given moment.
        /// </summary>
        /// <param name="snapshot">The identifier of the snapshot session.</param>
        /// <param name="numInstances">Returns the number of instances.</param>
        /// <param name="instances">Returns information about the instances.</param>
        /// <param name="grbit">Options for this call.</param>
        /// <returns>An error code if the call fails.</returns>
        public int JetOSSnapshotGetFreezeInfo(
            JET_OSSNAPID snapshot,
            out int numInstances,
            out JET_INSTANCE_INFO[] instances,
            SnapshotGetFreezeInfoGrbit grbit)
        {
            TraceFunctionCall();
            this.CheckSupportsVistaFeatures("JetOSSnapshotGetFreezeInfo");
            Debug.Assert(this.Capabilities.SupportsUnicodePaths, "JetOSSnapshotGetFreezeInfo is always Unicode");

            unsafe
            {
                uint nativeNumInstance = 0;
                NATIVE_INSTANCE_INFO* nativeInstanceInfos = null;
                int err = NativeMethods.JetOSSnapshotGetFreezeInfoW(snapshot.Value, out nativeNumInstance, out nativeInstanceInfos, (uint)grbit);
                instances = this.ConvertInstanceInfosUnicode(nativeNumInstance, nativeInstanceInfos);
                numInstances = instances.Length;

                return Err(err);
            }
        }

        /// <summary>
        /// Notifies the engine that it can resume normal IO operations after a
        /// freeze period and a successful snapshot.
        /// </summary>
        /// <param name="snapid">The ID of the snapshot.</param>
        /// <param name="grbit">Thaw options.</param>
        /// <returns>An error code if the call fails.</returns>
        public int JetOSSnapshotThaw(JET_OSSNAPID snapid, SnapshotThawGrbit grbit)
        {
            TraceFunctionCall();
            return Err(NativeMethods.JetOSSnapshotThaw(snapid.Value, (uint)grbit));
        }

        /// <summary>
        /// Enables log truncation for all instances that are part of the snapshot session.
        /// </summary>
        /// <remarks>
        /// This function should be called only if the snapshot was created with the
        /// <see cref="VistaGrbits.ContinueAfterThaw"/> option. Otherwise, the snapshot
        /// session ends after the call to <see cref="Api.JetOSSnapshotThaw"/>.
        /// </remarks>
        /// <param name="snapshot">The snapshot identifier.</param>
        /// <param name="grbit">Options for this call.</param>
        /// <returns>An error code if the call fails.</returns>
        public int JetOSSnapshotTruncateLog(JET_OSSNAPID snapshot, SnapshotTruncateLogGrbit grbit)
        {
            TraceFunctionCall();
            this.CheckSupportsVistaFeatures("JetOSSnapshotTruncateLog");
            return Err(NativeMethods.JetOSSnapshotTruncateLog(snapshot.Value, (uint)grbit));
        }

        /// <summary>
        /// Truncates the log for a specified instance during a snapshot session.
        /// </summary>
        /// <remarks>
        /// This function should be called only if the snapshot was created with the
        /// <see cref="VistaGrbits.ContinueAfterThaw"/> option. Otherwise, the snapshot
        /// session ends after the call to <see cref="Api.JetOSSnapshotThaw"/>.
        /// </remarks>
        /// <param name="snapshot">The snapshot identifier.</param>
        /// <param name="instance">The instance to truncat the log for.</param>
        /// <param name="grbit">Options for this call.</param>
        /// <returns>An error code if the call fails.</returns>
        public int JetOSSnapshotTruncateLogInstance(JET_OSSNAPID snapshot, JET_INSTANCE instance, SnapshotTruncateLogGrbit grbit)
        {
            TraceFunctionCall();
            this.CheckSupportsVistaFeatures("JetOSSnapshotTruncateLogInstance");
            return Err(NativeMethods.JetOSSnapshotTruncateLogInstance(snapshot.Value, instance.Value, (uint)grbit));
        }

        /// <summary>
        /// Notifies the engine that the snapshot session finished.
        /// </summary>
        /// <param name="snapid">The identifier of the snapshot session.</param>
        /// <param name="grbit">Snapshot end options.</param>
        /// <returns>An error code.</returns>
        public int JetOSSnapshotEnd(JET_OSSNAPID snapid, SnapshotEndGrbit grbit)
        {
            TraceFunctionCall();
            this.CheckSupportsVistaFeatures("JetOSSnapshotEnd");
            return Err(NativeMethods.JetOSSnapshotEnd(snapid.Value, (uint)grbit));
        }

        /// <summary>
        /// Notifies the engine that it can resume normal IO operations after a
        /// freeze period ended with a failed snapshot.
        /// </summary>
        /// <param name="snapid">Identifier of the snapshot session.</param>
        /// <param name="grbit">Options for this call.</param>
        /// <returns>An error code.</returns>
        public int JetOSSnapshotAbort(JET_OSSNAPID snapid, SnapshotAbortGrbit grbit)
        {
            TraceFunctionCall();
            this.CheckSupportsServer2003Features("JetOSSnapshotAbort");
            return Err(NativeMethods.JetOSSnapshotAbort(snapid.Value, (uint)grbit));
        }
#endif // !MANAGEDESENT_ON_WSA
        #endregion

        #region Streaming Backup/Restore
#if !MANAGEDESENT_ON_WSA

        /// <summary>
        /// Initiates an external backup while the engine and database are online and active.
        /// </summary>
        /// <param name="instance">The instance prepare for backup.</param>
        /// <param name="grbit">Backup options.</param>
        /// <returns>An error code if the call fails.</returns>
        public int JetBeginExternalBackupInstance(JET_INSTANCE instance, BeginExternalBackupGrbit grbit)
        {
            TraceFunctionCall();
            return Err(NativeMethods.JetBeginExternalBackupInstance(instance.Value, (uint)grbit));
        }

        /// <summary>
        /// Closes a file that was opened with JetOpenFileInstance after the
        /// data from that file has been extracted using JetReadFileInstance.
        /// </summary>
        /// <param name="instance">The instance to use.</param>
        /// <param name="handle">The handle to close.</param>
        /// <returns>An error code if the call fails.</returns>
        public int JetCloseFileInstance(JET_INSTANCE instance, JET_HANDLE handle)
        {
            TraceFunctionCall();
            return Err(NativeMethods.JetCloseFileInstance(instance.Value, handle.Value));
        }

        /// <summary>
        /// Ends an external backup session. This API is the last API in a series
        /// of APIs that must be called to execute a successful online
        /// (non-VSS based) backup.
        /// </summary>
        /// <param name="instance">The instance to end the backup for.</param>
        /// <returns>An error code if the call fails.</returns>
        public int JetEndExternalBackupInstance(JET_INSTANCE instance)
        {
            TraceFunctionCall();
            return Err(NativeMethods.JetEndExternalBackupInstance(instance.Value));
        }

        /// <summary>
        /// Ends an external backup session. This API is the last API in a series
        /// of APIs that must be called to execute a successful online
        /// (non-VSS based) backup.
        /// </summary>
        /// <param name="instance">The instance to end the backup for.</param>
        /// <param name="grbit">Options that specify how the backup ended.</param>
        /// <returns>An error code if the call fails.</returns>
        public int JetEndExternalBackupInstance2(JET_INSTANCE instance, EndExternalBackupGrbit grbit)
        {
            TraceFunctionCall();
            return Err(NativeMethods.JetEndExternalBackupInstance2(instance.Value, (uint)grbit));
        }

        /// <summary>
        /// Used during a backup initiated by <see cref="JetBeginExternalBackupInstance"/>
        /// to query an instance for the names of database files that should become part of
        /// the backup file set. Only databases that are currently attached to the instance
        /// using <see cref="JetAttachDatabase"/> will be considered. These files may
        /// subsequently be opened using <see cref="JetOpenFileInstance"/> and read
        /// using <see cref="JetReadFileInstance"/>.
        /// </summary>
        /// <remarks>
        /// It is important to note that this API does not return an error or warning if
        /// the output buffer is too small to accept the full list of files that should be
        /// part of the backup file set.
        /// </remarks>
        /// <param name="instance">The instance to get the information for.</param>
        /// <param name="files">
        /// Returns a list of null terminated strings describing the set of database files
        /// that should be a part of the backup file set. The list of strings returned in
        /// this buffer is in the same format as a multi-string used by the registry. Each
        /// null-terminated string is returned in sequence followed by a final null terminator.
        /// </param>
        /// <param name="maxChars">
        /// Maximum number of characters to retrieve.
        /// </param>
        /// <param name="actualChars">
        /// Actual size of the file list. If this is greater than maxChars
        /// then the list has been truncated.
        /// </param>
        /// <returns>An error code if the call fails.</returns>
        public int JetGetAttachInfoInstance(JET_INSTANCE instance, out string files, int maxChars, out int actualChars)
        {
            TraceFunctionCall();
            CheckNotNegative(maxChars, "maxChars");

            // These strings have embedded nulls so we can't use a StringBuilder.
            int err;
            if (this.Capabilities.SupportsUnicodePaths)
            {
                uint bytesMax = checked((uint)maxChars) * sizeof(char);
                byte[] szz = new byte[bytesMax];
                uint bytesActual = 0;
                err = Err(NativeMethods.JetGetAttachInfoInstanceW(instance.Value, szz, bytesMax, out bytesActual));
                actualChars = checked((int)bytesActual) / sizeof(char);
                files = Encoding.Unicode.GetString(szz, 0, Math.Min(szz.Length, (int)bytesActual));
            }
            else
            {
                uint bytesMax = checked((uint)maxChars);
                byte[] szz = new byte[bytesMax];
                uint bytesActual = 0;
                err = Err(NativeMethods.JetGetAttachInfoInstance(instance.Value, szz, bytesMax, out bytesActual));
                actualChars = checked((int)bytesActual);
                files = LibraryHelpers.EncodingASCII.GetString(szz, 0, Math.Min(szz.Length, (int)bytesActual));
            }

            return err;
        }

        /// <summary>
        /// Used during a backup initiated by <see cref="JetBeginExternalBackupInstance"/>
        /// to query an instance for the names of database patch files and logfiles that
        /// should become part of the backup file set. These files may subsequently be
        /// opened using <see cref="JetOpenFileInstance"/> and read using <see cref="JetReadFileInstance"/>.
        /// </summary>
        /// <remarks>
        /// It is important to note that this API does not return an error or warning if
        /// the output buffer is too small to accept the full list of files that should be
        /// part of the backup file set.
        /// </remarks>
        /// <param name="instance">The instance to get the information for.</param>
        /// <param name="files">
        /// Returns a list of null terminated strings describing the set of database patch files
        /// and log files that should be a part of the backup file set. The list of strings returned in
        /// this buffer is in the same format as a multi-string used by the registry. Each
        /// null-terminated string is returned in sequence followed by a final null terminator.
        /// </param>
        /// <param name="maxChars">
        /// Maximum number of characters to retrieve.
        /// </param>
        /// <param name="actualChars">
        /// Actual size of the file list. If this is greater than maxChars
        /// then the list has been truncated.
        /// </param>
        /// <returns>An error code if the call fails.</returns>
        public int JetGetLogInfoInstance(JET_INSTANCE instance, out string files, int maxChars, out int actualChars)
        {
            TraceFunctionCall();
            CheckNotNegative(maxChars, "maxChars");

            // These strings have embedded nulls so we can't use a StringBuilder.
            int err;
            if (this.Capabilities.SupportsUnicodePaths)
            {
                uint bytesMax = checked((uint)maxChars) * sizeof(char);
                byte[] szz = new byte[bytesMax];
                uint bytesActual = 0;
                err = Err(NativeMethods.JetGetLogInfoInstanceW(instance.Value, szz, bytesMax, out bytesActual));
                actualChars = checked((int)bytesActual) / sizeof(char);
                files = Encoding.Unicode.GetString(szz, 0, Math.Min(szz.Length, (int)bytesActual));
            }
            else
            {
                uint bytesMax = checked((uint)maxChars);
                byte[] szz = new byte[bytesMax];
                uint bytesActual = 0;
                err = Err(NativeMethods.JetGetLogInfoInstance(instance.Value, szz, bytesMax, out bytesActual));
                actualChars = checked((int)bytesActual);
                files = LibraryHelpers.EncodingASCII.GetString(szz, 0, Math.Min(szz.Length, (int)bytesActual));
            }

            return err;
        }

        /// <summary>
        /// Used during a backup initiated by <see cref="JetBeginExternalBackupInstance"/>
        /// to query an instance for the names of the transaction log files that can be safely
        /// deleted after the backup has successfully completed.
        /// </summary>
        /// <remarks>
        /// It is important to note that this API does not return an error or warning if
        /// the output buffer is too small to accept the full list of files that should be
        /// part of the backup file set.
        /// </remarks>
        /// <param name="instance">The instance to get the information for.</param>
        /// <param name="files">
        /// Returns a list of null terminated strings describing the set of database log files
        /// that can be safely deleted after the backup completes. The list of strings returned in
        /// this buffer is in the same format as a multi-string used by the registry. Each
        /// null-terminated string is returned in sequence followed by a final null terminator.
        /// </param>
        /// <param name="maxChars">
        /// Maximum number of characters to retrieve.
        /// </param>
        /// <param name="actualChars">
        /// Actual size of the file list. If this is greater than maxChars
        /// then the list has been truncated.
        /// </param>
        /// <returns>An error code if the call fails.</returns>
        public int JetGetTruncateLogInfoInstance(JET_INSTANCE instance, out string files, int maxChars, out int actualChars)
        {
            TraceFunctionCall();
            CheckNotNegative(maxChars, "maxChars");

            // These strings have embedded nulls so we can't use a StringBuilder.
            int err;
            if (this.Capabilities.SupportsUnicodePaths)
            {
                uint bytesMax = checked((uint)maxChars) * sizeof(char);
                byte[] szz = new byte[bytesMax];
                uint bytesActual = 0;
                err = Err(NativeMethods.JetGetTruncateLogInfoInstanceW(instance.Value, szz, bytesMax, out bytesActual));
                actualChars = checked((int)bytesActual) / sizeof(char);
                files = Encoding.Unicode.GetString(szz, 0, Math.Min(szz.Length, (int)bytesActual));
            }
            else
            {
                uint bytesMax = checked((uint)maxChars);
                byte[] szz = new byte[bytesMax];
                uint bytesActual = 0;
                err = Err(NativeMethods.JetGetTruncateLogInfoInstance(instance.Value, szz, bytesMax, out bytesActual));
                actualChars = checked((int)bytesActual);
                files = LibraryHelpers.EncodingASCII.GetString(szz, 0, Math.Min(szz.Length, (int)bytesActual));
            }

            return err;
        }

        /// <summary>
        /// Opens an attached database, database patch file, or transaction log
        /// file of an active instance for the purpose of performing a streaming
        /// fuzzy backup. The data from these files can subsequently be read
        /// through the returned handle using JetReadFileInstance. The returned
        /// handle must be closed using JetCloseFileInstance. An external backup
        /// of the instance must have been previously initiated using
        /// JetBeginExternalBackupInstance.
        /// </summary>
        /// <param name="instance">The instance to use.</param>
        /// <param name="file">The file to open.</param>
        /// <param name="handle">Returns a handle to the file.</param>
        /// <param name="fileSizeLow">Returns the least significant 32 bits of the file size.</param>
        /// <param name="fileSizeHigh">Returns the most significant 32 bits of the file size.</param>
        /// <returns>An error code if the call fails.</returns>
        public int JetOpenFileInstance(JET_INSTANCE instance, string file, out JET_HANDLE handle, out long fileSizeLow, out long fileSizeHigh)
        {
            TraceFunctionCall();
            CheckNotNull(file, "file");
            handle = JET_HANDLE.Nil;
            int err;
            uint nativeFileSizeLow;
            uint nativeFileSizeHigh;
            if (this.Capabilities.SupportsUnicodePaths)
            {
                err = Err(NativeMethods.JetOpenFileInstanceW(
                            instance.Value, file, out handle.Value, out nativeFileSizeLow, out nativeFileSizeHigh));
            }
            else
            {
                err = Err(NativeMethods.JetOpenFileInstance(
                            instance.Value, file, out handle.Value, out nativeFileSizeLow, out nativeFileSizeHigh));
            }

            fileSizeLow = nativeFileSizeLow;
            fileSizeHigh = nativeFileSizeHigh;
            return err;
        }

        /// <summary>
        /// Retrieves the contents of a file opened with <see cref="Api.JetOpenFileInstance"/>.
        /// </summary>
        /// <param name="instance">The instance to use.</param>
        /// <param name="file">The file to read from.</param>
        /// <param name="buffer">The buffer to read into.</param>
        /// <param name="bufferSize">The size of the buffer.</param>
        /// <param name="bytesRead">Returns the amount of data read into the buffer.</param>
        /// <returns>An error code if the call fails.</returns>
        public int JetReadFileInstance(JET_INSTANCE instance, JET_HANDLE file, byte[] buffer, int bufferSize, out int bytesRead)
        {
            TraceFunctionCall();
            CheckNotNull(buffer, "buffer");
            CheckDataSize(buffer, bufferSize, "bufferSize");

            // ESENT requires that the buffer be aligned on a page allocation boundary.
            // VirtualAlloc is the API used to do that, so we use P/Invoke to call it.
            IntPtr alignedBuffer = Win32.NativeMethods.VirtualAlloc(
                IntPtr.Zero,
                (UIntPtr)bufferSize,
                (uint)(Win32.AllocationType.MEM_COMMIT | Win32.AllocationType.MEM_RESERVE),
                (uint)Win32.MemoryProtection.PAGE_READWRITE);
            Win32.NativeMethods.ThrowExceptionOnNull(alignedBuffer, "VirtualAlloc");

            try
            {
                uint nativeBytesRead = 0;
                int err =
                    Err(
                        NativeMethods.JetReadFileInstance(
                            instance.Value, file.Value, alignedBuffer, checked((uint)bufferSize), out nativeBytesRead));
                bytesRead = checked((int)nativeBytesRead);

                // Copy the memory out of the aligned buffer into the user buffer.
                Marshal.Copy(alignedBuffer, buffer, 0, bytesRead);
                return err;
            }
            finally
            {
                bool freeSucceded = Win32.NativeMethods.VirtualFree(alignedBuffer, UIntPtr.Zero, (uint)Win32.FreeType.MEM_RELEASE);
                Win32.NativeMethods.ThrowExceptionOnFailure(freeSucceded, "VirtualFree");
            }
        }

        /// <summary>
        /// Used during a backup initiated by JetBeginExternalBackup to delete
        /// any transaction log files that will no longer be needed once the
        /// current backup completes successfully.
        /// </summary>
        /// <param name="instance">The instance to truncate.</param>
        /// <returns>An error code if the call fails.</returns>
        public int JetTruncateLogInstance(JET_INSTANCE instance)
        {
            TraceFunctionCall();
            return Err(NativeMethods.JetTruncateLogInstance(instance.Value));
        }
#endif // !MANAGEDESENT_ON_WSA
        #endregion

        #region Sessions

        /// <summary>
        /// Initialize a new ESENT session.
        /// </summary>
        /// <param name="instance">The initialized instance to create the session in.</param>
        /// <param name="sesid">Returns the created session.</param>
        /// <param name="username">The parameter is not used.</param>
        /// <param name="password">The parameter is not used.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetBeginSession(JET_INSTANCE instance, out JET_SESID sesid, string username, string password)
        {
            TraceFunctionCall();
            sesid = JET_SESID.Nil;
#if MANAGEDESENT_ON_WSA
            return Err(NativeMethods.JetBeginSessionW(instance.Value, out sesid.Value, username, password));
#else
            return Err(NativeMethods.JetBeginSession(instance.Value, out sesid.Value, username, password));
#endif
        }

        /// <summary>
        /// Associates a session with the current thread using the given context
        /// handle. This association overrides the default engine requirement
        /// that a transaction for a given session must occur entirely on the
        /// same thread.
        /// </summary>
        /// <param name="sesid">The session to set the context on.</param>
        /// <param name="context">The context to set.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetSetSessionContext(JET_SESID sesid, IntPtr context)
        {
            TraceFunctionCall();
            return Err(NativeMethods.JetSetSessionContext(sesid.Value, context));
        }

        /// <summary>
        /// Disassociates a session from the current thread. This should be
        /// used in conjunction with JetSetSessionContext.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetResetSessionContext(JET_SESID sesid)
        {
            TraceFunctionCall();
            return Err(NativeMethods.JetResetSessionContext(sesid.Value));
        }

        /// <summary>
        /// Ends a session.
        /// </summary>
        /// <param name="sesid">The session to end.</param>
        /// <param name="grbit">This parameter is not used.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetEndSession(JET_SESID sesid, EndSessionGrbit grbit)
        {
            TraceFunctionCall();
            return Err(NativeMethods.JetEndSession(sesid.Value, (uint)grbit));
        }

#if !MANAGEDESENT_ON_WSA // Not exposed in MSDK
        /// <summary>
        /// Initialize a new ESE session in the same instance as the given sesid.
        /// </summary>
        /// <param name="sesid">The session to duplicate.</param>
        /// <param name="newSesid">Returns the new session.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetDupSession(JET_SESID sesid, out JET_SESID newSesid)
        {
            TraceFunctionCall();
            newSesid = JET_SESID.Nil;
            return Err(NativeMethods.JetDupSession(sesid.Value, out newSesid.Value));
        }
#endif // !MANAGEDESENT_ON_WSA

        /// <summary>
        /// Retrieves performance information from the database engine for the
        /// current thread. Multiple calls can be used to collect statistics
        /// that reflect the activity of the database engine on this thread
        /// between those calls.
        /// </summary>
        /// <param name="threadstats">
        /// Returns the thread statistics..
        /// </param>
        /// <returns>An error code if the operation fails.</returns>
        public int JetGetThreadStats(out JET_THREADSTATS threadstats)
        {
            TraceFunctionCall();
            this.CheckSupportsVistaFeatures("JetGetThreadStats");

            // To speed up the interop we use unsafe code to avoid initializing
            // the out parameter. We just call the interop code.
            unsafe
            {
                fixed (JET_THREADSTATS* rawJetThreadstats = &threadstats)
                {
                    return Err(NativeMethods.JetGetThreadStats(rawJetThreadstats, checked((uint)JET_THREADSTATS.Size)));
                }
            }
        }

        #endregion

        #region Tables

        /// <summary>
        /// Opens a cursor on a previously created table.
        /// </summary>
        /// <param name="sesid">The database session to use.</param>
        /// <param name="dbid">The database to open the table in.</param>
        /// <param name="tablename">The name of the table to open.</param>
        /// <param name="parameters">The parameter is not used.</param>
        /// <param name="parametersLength">The parameter is not used.</param>
        /// <param name="grbit">Table open options.</param>
        /// <param name="tableid">Returns the opened table.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetOpenTable(JET_SESID sesid, JET_DBID dbid, string tablename, byte[] parameters, int parametersLength, OpenTableGrbit grbit, out JET_TABLEID tableid)
        {
            TraceFunctionCall();
            tableid = JET_TABLEID.Nil;
            CheckNotNull(tablename, "tablename");
            CheckDataSize(parameters, parametersLength, "parametersLength");

#if MANAGEDESENT_ON_WSA
            return Err(NativeMethods.JetOpenTableW(sesid.Value, dbid.Value, tablename, parameters, checked((uint)parametersLength), (uint)grbit, out tableid.Value));
#else
            return Err(NativeMethods.JetOpenTable(sesid.Value, dbid.Value, tablename, parameters, checked((uint)parametersLength), (uint)grbit, out tableid.Value));
#endif
        }

        /// <summary>
        /// Close an open table.
        /// </summary>
        /// <param name="sesid">The session which opened the table.</param>
        /// <param name="tableid">The table to close.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetCloseTable(JET_SESID sesid, JET_TABLEID tableid)
        {
            TraceFunctionCall();
            return Err(NativeMethods.JetCloseTable(sesid.Value, tableid.Value));
        }

#if !MANAGEDESENT_ON_WSA // Not exposed in MSDK
        /// <summary>
        /// Duplicates an open cursor and returns a handle to the duplicated cursor.
        /// If the cursor that was duplicated was a read-only cursor then the
        /// duplicated cursor is also a read-only cursor.
        /// Any state related to constructing a search key or updating a record is
        /// not copied into the duplicated cursor. In addition, the location of the
        /// original cursor is not duplicated into the duplicated cursor. The
        /// duplicated cursor is always opened on the clustered index and its
        /// location is always on the first row of the table.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The cursor to duplicate.</param>
        /// <param name="newTableid">The duplicated cursor.</param>
        /// <param name="grbit">Reserved for future use.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetDupCursor(JET_SESID sesid, JET_TABLEID tableid, out JET_TABLEID newTableid, DupCursorGrbit grbit)
        {
            TraceFunctionCall();
            newTableid = JET_TABLEID.Nil;
            return Err(NativeMethods.JetDupCursor(sesid.Value, tableid.Value, out newTableid.Value, (uint)grbit));
        }

        /// <summary>
        /// Walks each index of a table to exactly compute the number of entries
        /// in an index, and the number of distinct keys in an index. This
        /// information, together with the number of database pages allocated
        /// for an index and the current time of the computation is stored in
        /// index metadata in the database. This data can be subsequently retrieved
        /// with information operations.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The table that the statistics will be computed on.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetComputeStats(JET_SESID sesid, JET_TABLEID tableid)
        {
            TraceFunctionCall();
            return Err(NativeMethods.JetComputeStats(sesid.Value, tableid.Value));
        }

        /// <summary>
        /// Enables the application to associate a context handle known as
        /// Local Storage with a cursor or the table associated with that
        /// cursor. This context handle can be used by the application to
        /// store auxiliary data that is associated with a cursor or table.
        /// The application is later notified using a runtime callback when
        /// the context handle must be released. This makes it possible to
        /// associate dynamically allocated state with a cursor or table.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The cursor to use.</param>
        /// <param name="ls">The context handle to be associated with the session or cursor.</param>
        /// <param name="grbit">Set options.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetSetLS(JET_SESID sesid, JET_TABLEID tableid, JET_LS ls, LsGrbit grbit)
        {
            TraceFunctionCall();
            return Err(NativeMethods.JetSetLS(sesid.Value, tableid.Value, ls.Value, (uint)grbit));
        }

        /// <summary>
        /// Enables the application to retrieve the context handle known
        /// as Local Storage that is associated with a cursor or the table
        /// associated with that cursor. This context handle must have been
        /// previously set using <see cref="JetSetLS"/>. JetGetLS can also
        /// be used to simultaneously fetch the current context handle for
        /// a cursor or table and reset that context handle.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The cursor to use.</param>
        /// <param name="ls">Returns the retrieved context handle.</param>
        /// <param name="grbit">Retrieve options.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetGetLS(JET_SESID sesid, JET_TABLEID tableid, out JET_LS ls, LsGrbit grbit)
        {
            TraceFunctionCall();
            IntPtr native;
            int err = NativeMethods.JetGetLS(sesid.Value, tableid.Value, out native, (uint)grbit);
            ls = new JET_LS { Value = native };
            return Err(err);
        }

        /// <summary>
        /// Determine whether an update of the current record of a cursor
        /// will result in a write conflict, based on the current update
        /// status of the record. It is possible that a write conflict will
        /// ultimately be returned even if JetGetCursorInfo returns successfully.
        /// because another session may update the record before the current
        /// session is able to update the same record.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The cursor to check.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetGetCursorInfo(JET_SESID sesid, JET_TABLEID tableid)
        {
            TraceFunctionCall();
            return Err(NativeMethods.JetGetCursorInfo(sesid.Value, tableid.Value, IntPtr.Zero, 0, 0));
        }
#endif // !MANAGEDESENT_ON_WSA

        #endregion

        #region Transactions

        /// <summary>
        /// Causes a session to enter a transaction or create a new save point in an existing
        /// transaction.
        /// </summary>
        /// <param name="sesid">The session to begin the transaction for.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetBeginTransaction(JET_SESID sesid)
        {
            TraceFunctionCall();
#if MANAGEDESENT_ON_WSA
            // 19513 is an arbitrary number.
            return this.JetBeginTransaction3(sesid, 19513, BeginTransactionGrbit.None);
#else
            return Err(NativeMethods.JetBeginTransaction(sesid.Value));
#endif
        }

        /// <summary>
        /// Causes a session to enter a transaction or create a new save point in an existing
        /// transaction.
        /// </summary>
        /// <param name="sesid">The session to begin the transaction for.</param>
        /// <param name="grbit">Transaction options.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetBeginTransaction2(JET_SESID sesid, BeginTransactionGrbit grbit)
        {
            TraceFunctionCall();
#if MANAGEDESENT_ON_WSA
            // 33193 is an arbitrary number.
            return this.JetBeginTransaction3(sesid, 33193, BeginTransactionGrbit.None);
#else
            return Err(NativeMethods.JetBeginTransaction2(sesid.Value, unchecked((uint)grbit)));
#endif
        }

        /// <summary>
        /// Commits the changes made to the state of the database during the current save point
        /// and migrates them to the previous save point. If the outermost save point is committed
        /// then the changes made during that save point will be committed to the state of the
        /// database and the session will exit the transaction.
        /// </summary>
        /// <param name="sesid">The session to commit the transaction for.</param>
        /// <param name="grbit">Commit options.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetCommitTransaction(JET_SESID sesid, CommitTransactionGrbit grbit)
        {
            TraceFunctionCall();
#if MANAGEDESENT_ON_WSA
            JET_COMMIT_ID commitId;
            return this.JetCommitTransaction2(sesid, grbit, TimeSpan.Zero, out commitId);
#else
            return Err(NativeMethods.JetCommitTransaction(sesid.Value, unchecked((uint)grbit)));
#endif
        }

        /// <summary>
        /// Undoes the changes made to the state of the database
        /// and returns to the last save point. JetRollback will also close any cursors
        /// opened during the save point. If the outermost save point is undone, the
        /// session will exit the transaction.
        /// </summary>
        /// <param name="sesid">The session to rollback the transaction for.</param>
        /// <param name="grbit">Rollback options.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetRollback(JET_SESID sesid, RollbackTransactionGrbit grbit)
        {
            TraceFunctionCall();
            return Err(NativeMethods.JetRollback(sesid.Value, unchecked((uint)grbit)));
        }

        #endregion

        #region DDL

        /// <summary>
        /// Create an empty table. The newly created table is opened exclusively.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="dbid">The database to create the table in.</param>
        /// <param name="table">The name of the table to create.</param>
        /// <param name="pages">Initial number of pages in the table.</param>
        /// <param name="density">
        /// The default density of the table. This is used when doing sequential inserts.
        /// </param>
        /// <param name="tableid">Returns the tableid of the new table.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetCreateTable(JET_SESID sesid, JET_DBID dbid, string table, int pages, int density, out JET_TABLEID tableid)
        {
            TraceFunctionCall();
            tableid = JET_TABLEID.Nil;
            CheckNotNull(table, "table");

#if MANAGEDESENT_ON_WSA
            var tablecreate = new JET_TABLECREATE
            {
                szTableName = table,
                ulPages = pages,
                ulDensity = density,
            };
            int err = this.JetCreateTableColumnIndex4(sesid, dbid, tablecreate);
            tableid = tablecreate.tableid;
            return err;
#else
            return Err(NativeMethods.JetCreateTable(sesid.Value, dbid.Value, table, pages, density, out tableid.Value));
#endif
        }

        /// <summary>
        /// Deletes a table from a database.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="dbid">The database to delete the table from.</param>
        /// <param name="table">The name of the table to delete.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetDeleteTable(JET_SESID sesid, JET_DBID dbid, string table)
        {
            TraceFunctionCall();
            CheckNotNull(table, "table");

#if MANAGEDESENT_ON_WSA
            return Err(NativeMethods.JetDeleteTableW(sesid.Value, dbid.Value, table));
#else
            return Err(NativeMethods.JetDeleteTable(sesid.Value, dbid.Value, table));
#endif
        }

        /// <summary>
        /// Add a new column to an existing table.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The table to add the column to.</param>
        /// <param name="column">The name of the column.</param>
        /// <param name="columndef">The definition of the column.</param>
        /// <param name="defaultValue">The default value of the column.</param>
        /// <param name="defaultValueSize">The size of the default value.</param>
        /// <param name="columnid">Returns the columnid of the new column.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetAddColumn(JET_SESID sesid, JET_TABLEID tableid, string column, JET_COLUMNDEF columndef, byte[] defaultValue, int defaultValueSize, out JET_COLUMNID columnid)
        {
            TraceFunctionCall();
            columnid = JET_COLUMNID.Nil;
            CheckNotNull(column, "column");
            CheckNotNull(columndef, "columndef");
            CheckDataSize(defaultValue, defaultValueSize, "defaultValueSize");

            NATIVE_COLUMNDEF nativeColumndef = columndef.GetNativeColumndef();
#if MANAGEDESENT_ON_WSA
            int err = Err(NativeMethods.JetAddColumnW(
                                   sesid.Value,
                                   tableid.Value,
                                   column,
                                   ref nativeColumndef,
                                   defaultValue,
                                   checked((uint)defaultValueSize),
                                   out columnid.Value));
#else
            int err = Err(NativeMethods.JetAddColumn(
                                   sesid.Value,
                                   tableid.Value,
                                   column,
                                   ref nativeColumndef,
                                   defaultValue,
                                   checked((uint)defaultValueSize),
                                   out columnid.Value));
#endif // MANAGEDESENT_ON_WSA
            // esent doesn't actually set the columnid member of the passed in JET_COLUMNDEF, but we will do that here for
            // completeness.
            columndef.columnid = new JET_COLUMNID { Value = columnid.Value };
            return err;
        }

        /// <summary>
        /// Deletes a column from a database table.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">A cursor on the table to delete the column from.</param>
        /// <param name="column">The name of the column to be deleted.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetDeleteColumn(JET_SESID sesid, JET_TABLEID tableid, string column)
        {
#if MANAGEDESENT_ON_WSA
            return this.JetDeleteColumn2(sesid, tableid, column, DeleteColumnGrbit.None);
#else
            TraceFunctionCall();
            CheckNotNull(column, "column");
            return Err(NativeMethods.JetDeleteColumn(sesid.Value, tableid.Value, column));
#endif
        }

        /// <summary>
        /// Deletes a column from a database table.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">A cursor on the table to delete the column from.</param>
        /// <param name="column">The name of the column to be deleted.</param>
        /// <param name="grbit">Column deletion options.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetDeleteColumn2(JET_SESID sesid, JET_TABLEID tableid, string column, DeleteColumnGrbit grbit)
        {
            TraceFunctionCall();
            CheckNotNull(column, "column");
#if MANAGEDESENT_ON_WSA
            return Err(NativeMethods.JetDeleteColumn2W(sesid.Value, tableid.Value, column, (uint)grbit));
#else
            return Err(NativeMethods.JetDeleteColumn2(sesid.Value, tableid.Value, column, (uint)grbit));
#endif
        }

        /// <summary>
        /// Creates an index over data in an ESE database. An index can be used to locate
        /// specific data quickly.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The table to create the index on.</param>
        /// <param name="indexName">
        /// Pointer to a null-terminated string that specifies the name of the index to create.
        /// </param>
        /// <param name="grbit">Index creation options.</param>
        /// <param name="keyDescription">
        /// Pointer to a double null-terminated string of null-delimited tokens.
        /// </param>
        /// <param name="keyDescriptionLength">
        /// The length, in characters, of szKey including the two terminating nulls.
        /// </param>
        /// <param name="density">Initial B+ tree density.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetCreateIndex(
            JET_SESID sesid,
            JET_TABLEID tableid,
            string indexName,
            CreateIndexGrbit grbit,
            string keyDescription,
            int keyDescriptionLength,
            int density)
        {
            TraceFunctionCall();
#if MANAGEDESENT_ON_WSA
            // Up-convert to JetCreateIndex2().
            JET_INDEXCREATE indexcreate = new JET_INDEXCREATE();
            indexcreate.szIndexName = indexName;
            indexcreate.grbit = grbit;
            indexcreate.szKey = keyDescription;
            indexcreate.cbKey = keyDescriptionLength;
            indexcreate.ulDensity = density;

            JET_INDEXCREATE[] indexcreates = new JET_INDEXCREATE[] { indexcreate };

            return this.JetCreateIndex2(sesid, tableid, indexcreates, indexcreates.Length);
#else
            CheckNotNull(indexName, "indexName");
            CheckNotNegative(keyDescriptionLength, "keyDescriptionLength");
            CheckNotNegative(density, "density");
            if (keyDescriptionLength > checked(keyDescription.Length + 1))
            {
                throw new ArgumentOutOfRangeException(
                    "keyDescriptionLength", keyDescriptionLength, "cannot be greater than keyDescription.Length");
            }

            return Err(NativeMethods.JetCreateIndex(
                sesid.Value,
                tableid.Value,
                indexName,
                (uint)grbit,
                keyDescription,
                checked((uint)keyDescriptionLength),
                checked((uint)density)));
#endif // MANAGEDESENT_ON_WSA
        }

        /// <summary>
        /// Creates indexes over data in an ESE database.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The table to create the index on.</param>
        /// <param name="indexcreates">Array of objects describing the indexes to be created.</param>
        /// <param name="numIndexCreates">Number of index description objects.</param>
        /// <returns>An error code.</returns>
        public int JetCreateIndex2(
            JET_SESID sesid,
            JET_TABLEID tableid,
            JET_INDEXCREATE[] indexcreates,
            int numIndexCreates)
        {
            TraceFunctionCall();
            CheckNotNull(indexcreates, "indexcreates");
            CheckNotNegative(numIndexCreates, "numIndexCreates");
            if (numIndexCreates > indexcreates.Length)
            {
                throw new ArgumentOutOfRangeException(
                    "numIndexCreates", numIndexCreates, "numIndexCreates is larger than the number of indexes passed in");
            }

#if MANAGEDESENT_ON_WSA
            // Note that it is actually a bit risky to up-convert to CreateIndexes3(), which is why we don't
            // do it in the regular case.
            // Creating the NATIVE_UNICODEINDEX2 structure requires a locale string (not an LCID). If
            // JetCreateIndex2() is called, then the caller very likely used an LCID (or no locale at all).
            // If no locale is specified then it's OK.
            // But we can't convert an LCID to a locale name reliably on Core CLR platforms.
            // To get our test code working, we have a small hard-coded list of LCID->locale names.
            return CreateIndexes3(sesid, tableid, indexcreates, numIndexCreates);
#else
            // NOTE: Don't call CreateIndexes3() on Win8. Unlike other APIs, CreateIndexes3() is
            // not a superset. It requires locale names, and if the user called JetCreateIndex2(),
            // the input will likely have LCIDs.
            if (this.Capabilities.SupportsWindows7Features)
            {
                return CreateIndexes2(sesid, tableid, indexcreates, numIndexCreates);
            }

            if (this.Capabilities.SupportsVistaFeatures)
            {
                return CreateIndexes1(sesid, tableid, indexcreates, numIndexCreates);
            }

            return CreateIndexes(sesid, tableid, indexcreates, numIndexCreates);
#endif // MANAGEDESENT_ON_WSA
        }

        /// <summary>
        /// Deletes an index from a database table.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">A cursor on the table to delete the index from.</param>
        /// <param name="index">The name of the index to be deleted.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetDeleteIndex(JET_SESID sesid, JET_TABLEID tableid, string index)
        {
            TraceFunctionCall();
            CheckNotNull(index, "index");

#if MANAGEDESENT_ON_WSA
            return Err(NativeMethods.JetDeleteIndexW(sesid.Value, tableid.Value, index));
#else
            return Err(NativeMethods.JetDeleteIndex(sesid.Value, tableid.Value, index));
#endif
        }

        /// <summary>
        /// Creates a temporary table with a single index. A temporary table
        /// stores and retrieves records just like an ordinary table created
        /// using JetCreateTableColumnIndex. However, temporary tables are
        /// much faster than ordinary tables due to their volatile nature.
        /// They can also be used to very quickly sort and perform duplicate
        /// removal on record sets when accessed in a purely sequential manner.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="columns">
        /// Column definitions for the columns created in the temporary table.
        /// </param>
        /// <param name="numColumns">Number of column definitions.</param>
        /// <param name="grbit">Table creation options.</param>
        /// <param name="tableid">
        /// Returns the tableid of the temporary table. Closing this tableid
        /// frees the resources associated with the temporary table.
        /// </param>
        /// <param name="columnids">
        /// The output buffer that receives the array of column IDs generated
        /// during the creation of the temporary table. The column IDs in this
        /// array will exactly correspond to the input array of column definitions.
        /// As a result, the size of this buffer must correspond to the size of the input array.
        /// </param>
        /// <returns>An error code.</returns>
        public int JetOpenTempTable(
            JET_SESID sesid,
            JET_COLUMNDEF[] columns,
            int numColumns,
            TempTableGrbit grbit,
            out JET_TABLEID tableid,
            JET_COLUMNID[] columnids)
        {
            TraceFunctionCall();
            CheckNotNull(columns, "columnns");
            CheckDataSize(columns, numColumns, "numColumns");
            CheckNotNull(columnids, "columnids");
            CheckDataSize(columnids, numColumns, "numColumns");

#if MANAGEDESENT_ON_WSA
            return this.JetOpenTempTable3(sesid, columns, numColumns, null, grbit, out tableid, columnids);
#else
            tableid = JET_TABLEID.Nil;

            NATIVE_COLUMNDEF[] nativecolumndefs = GetNativecolumndefs(columns, numColumns);
            var nativecolumnids = new uint[numColumns];

            int err = Err(NativeMethods.JetOpenTempTable(
                sesid.Value, nativecolumndefs, checked((uint)numColumns), (uint)grbit, out tableid.Value, nativecolumnids));

            SetColumnids(columns, columnids, nativecolumnids, numColumns);

            return err;
#endif
        }

#if !MANAGEDESENT_ON_WSA // Not exposed in MSDK
        /// <summary>
        /// Creates a temporary table with a single index. A temporary table
        /// stores and retrieves records just like an ordinary table created
        /// using JetCreateTableColumnIndex. However, temporary tables are
        /// much faster than ordinary tables due to their volatile nature.
        /// They can also be used to very quickly sort and perform duplicate
        /// removal on record sets when accessed in a purely sequential manner.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="columns">
        /// Column definitions for the columns created in the temporary table.
        /// </param>
        /// <param name="numColumns">Number of column definitions.</param>
        /// <param name="lcid">
        /// The locale ID to use to compare any Unicode key column data in the temporary table.
        /// Any locale may be used as long as the appropriate language pack has been installed
        /// on the machine.
        /// </param>
        /// <param name="grbit">Table creation options.</param>
        /// <param name="tableid">
        /// Returns the tableid of the temporary table. Closing this tableid
        /// frees the resources associated with the temporary table.
        /// </param>
        /// <param name="columnids">
        /// The output buffer that receives the array of column IDs generated
        /// during the creation of the temporary table. The column IDs in this
        /// array will exactly correspond to the input array of column definitions.
        /// As a result, the size of this buffer must correspond to the size of the input array.
        /// </param>
        /// <returns>An error code.</returns>
        public int JetOpenTempTable2(
            JET_SESID sesid,
            JET_COLUMNDEF[] columns,
            int numColumns,
            int lcid,
            TempTableGrbit grbit,
            out JET_TABLEID tableid,
            JET_COLUMNID[] columnids)
        {
            TraceFunctionCall();
            CheckNotNull(columns, "columnns");
            CheckDataSize(columns, numColumns, "numColumns");
            CheckNotNull(columnids, "columnids");
            CheckDataSize(columnids, numColumns, "numColumns");

            tableid = JET_TABLEID.Nil;

            NATIVE_COLUMNDEF[] nativecolumndefs = GetNativecolumndefs(columns, numColumns);
            var nativecolumnids = new uint[numColumns];

            int err = Err(NativeMethods.JetOpenTempTable2(
                sesid.Value, nativecolumndefs, checked((uint)numColumns), (uint)lcid, (uint)grbit, out tableid.Value, nativecolumnids));

            SetColumnids(columns, columnids, nativecolumnids, numColumns);

            return err;
        }
#endif // !MANAGEDESENT_ON_WSA

        /// <summary>
        /// Creates a temporary table with a single index. A temporary table
        /// stores and retrieves records just like an ordinary table created
        /// using JetCreateTableColumnIndex. However, temporary tables are
        /// much faster than ordinary tables due to their volatile nature.
        /// They can also be used to very quickly sort and perform duplicate
        /// removal on record sets when accessed in a purely sequential manner.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="columns">
        /// Column definitions for the columns created in the temporary table.
        /// </param>
        /// <param name="numColumns">Number of column definitions.</param>
        /// <param name="unicodeindex">
        /// The Locale ID and normalization flags that will be used to compare
        /// any Unicode key column data in the temporary table. When this
        /// is not present then the default options are used.
        /// </param>
        /// <param name="grbit">Table creation options.</param>
        /// <param name="tableid">
        /// Returns the tableid of the temporary table. Closing this tableid
        /// frees the resources associated with the temporary table.
        /// </param>
        /// <param name="columnids">
        /// The output buffer that receives the array of column IDs generated
        /// during the creation of the temporary table. The column IDs in this
        /// array will exactly correspond to the input array of column definitions.
        /// As a result, the size of this buffer must correspond to the size of the input array.
        /// </param>
        /// <returns>An error code.</returns>
        public int JetOpenTempTable3(
            JET_SESID sesid,
            JET_COLUMNDEF[] columns,
            int numColumns,
            JET_UNICODEINDEX unicodeindex,
            TempTableGrbit grbit,
            out JET_TABLEID tableid,
            JET_COLUMNID[] columnids)
        {
            TraceFunctionCall();
            CheckNotNull(columns, "columnns");
            CheckDataSize(columns, numColumns, "numColumns");
            CheckNotNull(columnids, "columnids");
            CheckDataSize(columnids, numColumns, "numColumns");

            tableid = JET_TABLEID.Nil;

            NATIVE_COLUMNDEF[] nativecolumndefs = GetNativecolumndefs(columns, numColumns);
            var nativecolumnids = new uint[numColumns];

            int err;
            if (null != unicodeindex)
            {
                NATIVE_UNICODEINDEX nativeunicodeindex = unicodeindex.GetNativeUnicodeIndex();
                err = Err(NativeMethods.JetOpenTempTable3(
                    sesid.Value, nativecolumndefs, checked((uint)numColumns), ref nativeunicodeindex, (uint)grbit, out tableid.Value, nativecolumnids));
            }
            else
            {
                err = Err(NativeMethods.JetOpenTempTable3(
                    sesid.Value, nativecolumndefs, checked((uint)numColumns), IntPtr.Zero, (uint)grbit, out tableid.Value, nativecolumnids));
            }

            SetColumnids(columns, columnids, nativecolumnids, numColumns);

            return err;
        }

        /// <summary>
        /// Creates a temporary table with a single index. A temporary table
        /// stores and retrieves records just like an ordinary table created
        /// using JetCreateTableColumnIndex. However, temporary tables are
        /// much faster than ordinary tables due to their volatile nature.
        /// They can also be used to very quickly sort and perform duplicate
        /// removal on record sets when accessed in a purely sequential manner.
        /// </summary>
        /// <remarks>
        /// Introduced in Windows Vista.
        /// </remarks>
        /// <param name="sesid">The session to use.</param>
        /// <param name="temporarytable">
        /// Description of the temporary table to create on input. After a
        /// successful call, the structure contains the handle to the temporary
        /// table and column identifications.
        /// </param>
        /// <returns>An error code.</returns>
        public int JetOpenTemporaryTable(JET_SESID sesid, JET_OPENTEMPORARYTABLE temporarytable)
        {
            TraceFunctionCall();
#if MANAGEDESENT_ON_WSA
            return this.JetOpenTemporaryTable2(sesid, temporarytable);
#else
            this.CheckSupportsVistaFeatures("JetOpenTemporaryTable");
            CheckNotNull(temporarytable, "temporarytable");

            NATIVE_OPENTEMPORARYTABLE nativetemporarytable = temporarytable.GetNativeOpenTemporaryTable();
            var nativecolumnids = new uint[nativetemporarytable.ccolumn];
            NATIVE_COLUMNDEF[] nativecolumndefs = GetNativecolumndefs(temporarytable.prgcolumndef, temporarytable.ccolumn);
            unsafe
            {
                using (var gchandlecollection = new GCHandleCollection())
                {
                    // Pin memory
                    nativetemporarytable.prgcolumndef = (NATIVE_COLUMNDEF*)gchandlecollection.Add(nativecolumndefs);
                    nativetemporarytable.rgcolumnid = (uint*)gchandlecollection.Add(nativecolumnids);
                    if (null != temporarytable.pidxunicode)
                    {
                        nativetemporarytable.pidxunicode = (NATIVE_UNICODEINDEX*)
                            gchandlecollection.Add(temporarytable.pidxunicode.GetNativeUnicodeIndex());
                    }

                    // Call the interop method
                    int err = Err(NativeMethods.JetOpenTemporaryTable(sesid.Value, ref nativetemporarytable));

                    // Convert the return values
                    SetColumnids(temporarytable.prgcolumndef, temporarytable.prgcolumnid, nativecolumnids, temporarytable.ccolumn);
                    temporarytable.tableid = new JET_TABLEID { Value = nativetemporarytable.tableid };

                    return err;
                }
            }
#endif // MANAGEDESENT_ON_WSA
        }

        /// <summary>
        /// Creates a table, adds columns, and indices on that table.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="dbid">The database to which to add the new table.</param>
        /// <param name="tablecreate">Object describing the table to create.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetCreateTableColumnIndex3(
            JET_SESID sesid,
            JET_DBID dbid,
            JET_TABLECREATE tablecreate)
        {
            TraceFunctionCall();
            CheckNotNull(tablecreate, "tablecreate");

#if MANAGEDESENT_ON_WSA
            return CreateTableColumnIndex4(sesid, dbid, tablecreate);
#else
            if (this.Capabilities.SupportsWindows7Features)
            {
                return CreateTableColumnIndex3(sesid, dbid, tablecreate);
            }

            return this.CreateTableColumnIndex2(sesid, dbid, tablecreate);
#endif
        }

        #region JetGetTableColumnInfo overloads

        /// <summary>
        /// Retrieves information about a table column.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The table containing the column.</param>
        /// <param name="columnName">The name of the column.</param>
        /// <param name="columndef">Filled in with information about the column.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetGetTableColumnInfo(
                JET_SESID sesid,
                JET_TABLEID tableid,
                string columnName,
                out JET_COLUMNDEF columndef)
        {
            TraceFunctionCall();
            columndef = new JET_COLUMNDEF();
            CheckNotNull(columnName, "columnName");

            var nativeColumndef = new NATIVE_COLUMNDEF();
            nativeColumndef.cbStruct = checked((uint)Marshal.SizeOf(typeof(NATIVE_COLUMNDEF)));
            int err;

            if (this.Capabilities.SupportsVistaFeatures)
            {
                err = Err(NativeMethods.JetGetTableColumnInfoW(
                    sesid.Value,
                    tableid.Value,
                    columnName,
                    ref nativeColumndef,
                    nativeColumndef.cbStruct,
                    (uint)JET_ColInfo.Default));
            }
            else
            {
#if MANAGEDESENT_ON_WSA
                err = Err((int)JET_err.FeatureNotAvailable);
#else
                err = Err(NativeMethods.JetGetTableColumnInfo(
                    sesid.Value,
                    tableid.Value,
                    columnName,
                    ref nativeColumndef,
                    nativeColumndef.cbStruct,
                    (uint)JET_ColInfo.Default));
#endif
            }

            columndef.SetFromNativeColumndef(nativeColumndef);

            return err;
        }

        /// <summary>
        /// Retrieves information about a table column.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The table containing the column.</param>
        /// <param name="columnid">The columnid of the column.</param>
        /// <param name="columndef">Filled in with information about the column.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetGetTableColumnInfo(
                JET_SESID sesid,
                JET_TABLEID tableid,
                JET_COLUMNID columnid,
                out JET_COLUMNDEF columndef)
        {
            TraceFunctionCall();
            columndef = new JET_COLUMNDEF();
            int err;

            var nativeColumndef = new NATIVE_COLUMNDEF();
            nativeColumndef.cbStruct = checked((uint)Marshal.SizeOf(typeof(NATIVE_COLUMNDEF)));

            if (this.Capabilities.SupportsVistaFeatures)
            {
                err = Err(NativeMethods.JetGetTableColumnInfoW(
                    sesid.Value,
                    tableid.Value,
                    ref columnid.Value,
                    ref nativeColumndef,
                    nativeColumndef.cbStruct,
                    (uint)JET_ColInfo.ByColid));
            }
            else
            {
#if MANAGEDESENT_ON_WSA
                err = Err((int)JET_err.FeatureNotAvailable);
#else
                err = Err(NativeMethods.JetGetTableColumnInfo(
                    sesid.Value,
                    tableid.Value,
                    ref columnid.Value,
                    ref nativeColumndef,
                    nativeColumndef.cbStruct,
                    (uint)JET_ColInfo.ByColid));
#endif
            }

            columndef.SetFromNativeColumndef(nativeColumndef);

            return err;
        }

        /// <summary>
        /// Retrieves information about a table column, given its <see cref="JET_TABLEID"/> and name.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The table containing the column.</param>
        /// <param name="columnName">The name of the column.</param>
        /// <param name="columnbase">Filled in with information about the column.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetGetTableColumnInfo(
                JET_SESID sesid,
                JET_TABLEID tableid,
                string columnName,
                out JET_COLUMNBASE columnbase)
        {
            TraceFunctionCall();
            CheckNotNull(columnName, "columnName");

            int err;

            if (this.Capabilities.SupportsVistaFeatures)
            {
                var nativeColumnbase = new NATIVE_COLUMNBASE_WIDE();
                nativeColumnbase.cbStruct = checked((uint)Marshal.SizeOf(typeof(NATIVE_COLUMNBASE_WIDE)));

                err = Err(NativeMethods.JetGetTableColumnInfoW(
                    sesid.Value,
                    tableid.Value,
                    columnName,
                    ref nativeColumnbase,
                    nativeColumnbase.cbStruct,
                    (uint)JET_ColInfo.Base));

                columnbase = new JET_COLUMNBASE(nativeColumnbase);
            }
            else
            {
#if MANAGEDESENT_ON_WSA
                err = Err((int)JET_err.FeatureNotAvailable);
                columnbase = null;
#else
                var nativeColumnbase = new NATIVE_COLUMNBASE();
                nativeColumnbase.cbStruct = checked((uint)Marshal.SizeOf(typeof(NATIVE_COLUMNBASE)));

                err = Err(NativeMethods.JetGetTableColumnInfo(
                    sesid.Value,
                    tableid.Value,
                    columnName,
                    ref nativeColumnbase,
                    nativeColumnbase.cbStruct,
                    (uint)JET_ColInfo.Base));

                columnbase = new JET_COLUMNBASE(nativeColumnbase);
#endif
            }

            return err;
        }

        /// <summary>
        /// Retrieves information about a table column, given its <see cref="JET_TABLEID"/> and <see cref="JET_COLUMNID"/>.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The table containing the column.</param>
        /// <param name="columnid">The columnid of the column.</param>
        /// <param name="columnbase">Filled in with information about the column.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetGetTableColumnInfo(
            JET_SESID sesid,
            JET_TABLEID tableid,
            JET_COLUMNID columnid,
            out JET_COLUMNBASE columnbase)
        {
            TraceFunctionCall();
            this.CheckSupportsVistaFeatures("JetGetTableColumnInfo");
            int err;

            var nativeColumnbase = new NATIVE_COLUMNBASE_WIDE();
            nativeColumnbase.cbStruct = checked((uint)Marshal.SizeOf(typeof(NATIVE_COLUMNBASE_WIDE)));

            err = Err(NativeMethods.JetGetTableColumnInfoW(
                sesid.Value,
                tableid.Value,
                ref columnid.Value,
                ref nativeColumnbase,
                nativeColumnbase.cbStruct,
                (uint)VistaColInfo.BaseByColid));

            columnbase = new JET_COLUMNBASE(nativeColumnbase);

            return err;
        }

        /// <summary>
        /// Retrieves information about all columns in the table.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The table containing the column.</param>
        /// <param name="ignored">The parameter is ignored.</param>
        /// <param name="grbit">Additional options for JetGetTableColumnInfo.</param>
        /// <param name="columnlist">Filled in with information about the columns in the table.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetGetTableColumnInfo(
                JET_SESID sesid,
                JET_TABLEID tableid,
                string ignored,
                ColInfoGrbit grbit,
                out JET_COLUMNLIST columnlist)
        {
            TraceFunctionCall();
            columnlist = new JET_COLUMNLIST();
            int err;

            var nativeColumnlist = new NATIVE_COLUMNLIST();
            nativeColumnlist.cbStruct = checked((uint)Marshal.SizeOf(typeof(NATIVE_COLUMNLIST)));

            // Technically, this should have worked in Vista. But there was a bug, and
            // it was fixed after Windows 7.
            if (this.Capabilities.SupportsWindows8Features)
            {
                err = Err(NativeMethods.JetGetTableColumnInfoW(
                    sesid.Value,
                    tableid.Value,
                    ignored,
                    ref nativeColumnlist,
                    nativeColumnlist.cbStruct,
                    (uint)grbit | (uint)JET_ColInfo.List));
            }
            else
            {
#if MANAGEDESENT_ON_WSA
                err = Err((int)JET_err.FeatureNotAvailable);
#else
                err = Err(NativeMethods.JetGetTableColumnInfo(
                    sesid.Value,
                    tableid.Value,
                    ignored,
                    ref nativeColumnlist,
                    nativeColumnlist.cbStruct,
                    (uint)grbit | (uint)JET_ColInfo.List));
#endif
            }

            columnlist.SetFromNativeColumnlist(nativeColumnlist);

            return err;
        }

        #endregion

        #region JetGetColumnInfo overloads

        /// <summary>
        /// Retrieves information about a table column.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="dbid">The database that contains the table.</param>
        /// <param name="tablename">The name of the table containing the column.</param>
        /// <param name="columnName">The name of the column.</param>
        /// <param name="columndef">Filled in with information about the column.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetGetColumnInfo(
                JET_SESID sesid,
                JET_DBID dbid,
                string tablename,
                string columnName,
                out JET_COLUMNDEF columndef)
        {
            TraceFunctionCall();
            columndef = new JET_COLUMNDEF();
            CheckNotNull(tablename, "tablename");
            CheckNotNull(columnName, "columnName");
            int err;

            var nativeColumndef = new NATIVE_COLUMNDEF();
            nativeColumndef.cbStruct = checked((uint)Marshal.SizeOf(typeof(NATIVE_COLUMNDEF)));

            // Technically, this should have worked in Vista. But there was a bug, and
            // it was fixed after Windows 7.
            if (this.Capabilities.SupportsWindows8Features)
            {
                err = Err(NativeMethods.JetGetColumnInfoW(
                        sesid.Value,
                        dbid.Value,
                        tablename,
                        columnName,
                        ref nativeColumndef,
                        nativeColumndef.cbStruct,
                        (uint)JET_ColInfo.Default));
            }
            else
            {
#if MANAGEDESENT_ON_WSA
                err = Err((int)JET_err.FeatureNotAvailable);
#else
                err = Err(NativeMethods.JetGetColumnInfo(
                    sesid.Value,
                    dbid.Value,
                    tablename,
                    columnName,
                    ref nativeColumndef,
                    nativeColumndef.cbStruct,
                    (uint)JET_ColInfo.Default));
#endif
            }

            columndef.SetFromNativeColumndef(nativeColumndef);

            return err;
        }

        /// <summary>
        /// Retrieves information about all columns in a table.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="dbid">The database that contains the table.</param>
        /// <param name="tablename">The name of the table containing the column.</param>
        /// <param name="ignored">This parameter is ignored.</param>
        /// <param name="columnlist">Filled in with information about the columns in the table.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetGetColumnInfo(
                JET_SESID sesid,
                JET_DBID dbid,
                string tablename,
                string ignored,
                out JET_COLUMNLIST columnlist)
        {
            TraceFunctionCall();
            columnlist = new JET_COLUMNLIST();
            CheckNotNull(tablename, "tablename");
            int err;

            var nativeColumnlist = new NATIVE_COLUMNLIST();
            nativeColumnlist.cbStruct = checked((uint)Marshal.SizeOf(typeof(NATIVE_COLUMNLIST)));

            // Technically, this should have worked in Vista. But there was a bug, and
            // it was fixed after Windows 7.
            if (this.Capabilities.SupportsWindows8Features)
            {
                err = Err(NativeMethods.JetGetColumnInfoW(
                    sesid.Value,
                    dbid.Value,
                    tablename,
                    ignored,
                    ref nativeColumnlist,
                    nativeColumnlist.cbStruct,
                    (uint)JET_ColInfo.List));
            }
            else
            {
#if MANAGEDESENT_ON_WSA
                err = Err((int)JET_err.FeatureNotAvailable);
#else
                err = Err(NativeMethods.JetGetColumnInfo(
                    sesid.Value,
                    dbid.Value,
                    tablename,
                    ignored,
                    ref nativeColumnlist,
                    nativeColumnlist.cbStruct,
                    (uint)JET_ColInfo.List));
#endif
            }

            columnlist.SetFromNativeColumnlist(nativeColumnlist);

            return err;
        }

        /// <summary>
        /// Retrieves information about a column in a table.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="dbid">The database that contains the table.</param>
        /// <param name="tablename">The name of the table containing the column.</param>
        /// <param name="columnName">The name of the column.</param>
        /// <param name="columnbase">Filled in with information about the columns in the table.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetGetColumnInfo(
                JET_SESID sesid,
                JET_DBID dbid,
                string tablename,
                string columnName,
                out JET_COLUMNBASE columnbase)
        {
            TraceFunctionCall();
            CheckNotNull(tablename, "tablename");
            CheckNotNull(columnName, "columnName");
            int err;

            // Technically, this should have worked in Vista. But there was a bug, and
            // it was fixed after Windows 7.
            if (this.Capabilities.SupportsWindows8Features)
            {
                var nativeColumnbase = new NATIVE_COLUMNBASE_WIDE();
                nativeColumnbase.cbStruct = checked((uint)Marshal.SizeOf(typeof(NATIVE_COLUMNBASE_WIDE)));

                err = Err(NativeMethods.JetGetColumnInfoW(
                    sesid.Value,
                    dbid.Value,
                    tablename,
                    columnName,
                    ref nativeColumnbase,
                    nativeColumnbase.cbStruct,
                    (uint)JET_ColInfo.Base));

                columnbase = new JET_COLUMNBASE(nativeColumnbase);
            }
            else
            {
                var nativeColumnbase = new NATIVE_COLUMNBASE();
                nativeColumnbase.cbStruct = checked((uint)Marshal.SizeOf(typeof(NATIVE_COLUMNBASE)));

#if MANAGEDESENT_ON_WSA
                err = Err((int)JET_err.FeatureNotAvailable);
#else
                err = Err(NativeMethods.JetGetColumnInfo(
                    sesid.Value,
                    dbid.Value,
                    tablename,
                    columnName,
                    ref nativeColumnbase,
                    nativeColumnbase.cbStruct,
                    (uint)JET_ColInfo.Base));
#endif

                columnbase = new JET_COLUMNBASE(nativeColumnbase);
            }

            return err;
        }

        /// <summary>
        /// Retrieves information about a column.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="dbid">The database that contains the table.</param>
        /// <param name="tablename">The name of the table containing the column.</param>
        /// <param name="columnid">The columnid of the column.</param>
        /// <param name="columnbase">Filled in with information about the columns in the table.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetGetColumnInfo(
                JET_SESID sesid,
                JET_DBID dbid,
                string tablename,
                JET_COLUMNID columnid,
                out JET_COLUMNBASE columnbase)
        {
            TraceFunctionCall();
            this.CheckSupportsVistaFeatures("JetGetColumnInfo");
            CheckNotNull(tablename, "tablename");
            int err;

            // Technically, this should have worked in Vista. But there was a bug, and
            // it was fixed after Windows 7.
            if (this.Capabilities.SupportsWindows8Features)
            {
                var nativeColumnbase = new NATIVE_COLUMNBASE_WIDE();
                nativeColumnbase.cbStruct = checked((uint)Marshal.SizeOf(typeof(NATIVE_COLUMNBASE_WIDE)));

                err = Err(NativeMethods.JetGetColumnInfoW(
                    sesid.Value,
                    dbid.Value,
                    tablename,
                    ref columnid.Value,
                    ref nativeColumnbase,
                    nativeColumnbase.cbStruct,
                    (uint)VistaColInfo.BaseByColid));

                columnbase = new JET_COLUMNBASE(nativeColumnbase);
            }
            else
            {
                var nativeColumnbase = new NATIVE_COLUMNBASE();
                nativeColumnbase.cbStruct = checked((uint)Marshal.SizeOf(typeof(NATIVE_COLUMNBASE)));

#if MANAGEDESENT_ON_WSA
                err = Err((int)JET_err.FeatureNotAvailable);
#else
                err = Err(NativeMethods.JetGetColumnInfo(
                    sesid.Value,
                    dbid.Value,
                    tablename,
                    ref columnid.Value,
                    ref nativeColumnbase,
                    nativeColumnbase.cbStruct,
                    (uint)VistaColInfo.BaseByColid));

#endif
                columnbase = new JET_COLUMNBASE(nativeColumnbase);
            }

            return err;
        }

        #endregion

        #region JetGetObjectInfo overloads

        /// <summary>
        /// Retrieves information about database objects.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="dbid">The database to use.</param>
        /// <param name="objectlist">Filled in with information about the objects in the database.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetGetObjectInfo(JET_SESID sesid, JET_DBID dbid, out JET_OBJECTLIST objectlist)
        {
            TraceFunctionCall();
            objectlist = new JET_OBJECTLIST();

            var nativeObjectlist = new NATIVE_OBJECTLIST();
            nativeObjectlist.cbStruct = checked((uint)Marshal.SizeOf(typeof(NATIVE_OBJECTLIST)));
            int err;

            if (this.Capabilities.SupportsVistaFeatures)
            {
                err = Err(NativeMethods.JetGetObjectInfoW(
                    sesid.Value,
                    dbid.Value,
                    (uint)JET_objtyp.Table,
                    null,
                    null,
                    ref nativeObjectlist,
                    nativeObjectlist.cbStruct,
                    (uint)JET_ObjInfo.ListNoStats));
            }
            else
            {
#if MANAGEDESENT_ON_WSA
                err = Err((int)JET_err.FeatureNotAvailable);
#else
                err = Err(NativeMethods.JetGetObjectInfo(
                    sesid.Value,
                    dbid.Value,
                    (uint)JET_objtyp.Table,
                    null,
                    null,
                    ref nativeObjectlist,
                    nativeObjectlist.cbStruct,
                    (uint)JET_ObjInfo.ListNoStats));
#endif
            }

            objectlist.SetFromNativeObjectlist(nativeObjectlist);
            return err;
        }

        /// <summary>
        /// Retrieves information about database objects.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="dbid">The database to use.</param>
        /// <param name="objtyp">The type of the object.</param>
        /// <param name="objectName">The object name about which to retrieve information.</param>
        /// <param name="objectinfo">Filled in with information about the objects in the database.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetGetObjectInfo(
            JET_SESID sesid,
            JET_DBID dbid,
            JET_objtyp objtyp,
            string objectName,
            out JET_OBJECTINFO objectinfo)
        {
            TraceFunctionCall();
            objectinfo = new JET_OBJECTINFO();

            var nativeObjectinfo = new NATIVE_OBJECTINFO();
            nativeObjectinfo.cbStruct = checked((uint)Marshal.SizeOf(typeof(NATIVE_OBJECTINFO)));
            int err;

            if (this.Capabilities.SupportsVistaFeatures)
            {
                err = Err(NativeMethods.JetGetObjectInfoW(
                    sesid.Value,
                    dbid.Value,
                    (uint)objtyp,
                    null,
                    objectName,
                    ref nativeObjectinfo,
                    nativeObjectinfo.cbStruct,
                    (uint)JET_ObjInfo.NoStats));
            }
            else
            {
#if MANAGEDESENT_ON_WSA
                err = Err((int)JET_err.FeatureNotAvailable);
#else
                err = Err(NativeMethods.JetGetObjectInfo(
                    sesid.Value,
                    dbid.Value,
                    (uint)objtyp,
                    null,
                    objectName,
                    ref nativeObjectinfo,
                    nativeObjectinfo.cbStruct,
                    (uint)JET_ObjInfo.NoStats));
#endif
            }

            objectinfo.SetFromNativeObjectinfo(ref nativeObjectinfo);
            return err;
        }

        #endregion

        /// <summary>
        /// JetGetCurrentIndex function determines the name of the current
        /// index of a given cursor. This name is also used to later re-select
        /// that index as the current index using <see cref="JetSetCurrentIndex"/>. It can
        /// also be used to discover the properties of that index using
        /// JetGetTableIndexInfo.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The cursor to get the index name for.</param>
        /// <param name="indexName">Returns the name of the index.</param>
        /// <param name="maxNameLength">
        /// The maximum length of the index name. Index names are no more than
        /// Api.MaxNameLength characters.
        /// </param>
        /// <returns>An error if the call fails.</returns>
        public int JetGetCurrentIndex(JET_SESID sesid, JET_TABLEID tableid, out string indexName, int maxNameLength)
        {
            TraceFunctionCall();
            CheckNotNegative(maxNameLength, "maxNameLength");

            var name = new StringBuilder(maxNameLength);
#if MANAGEDESENT_ON_WSA
            int err = Err(NativeMethods.JetGetCurrentIndexW(sesid.Value, tableid.Value, name, checked((uint)maxNameLength)));
#else
            int err = Err(NativeMethods.JetGetCurrentIndex(sesid.Value, tableid.Value, name, checked((uint)maxNameLength)));
#endif
            indexName = name.ToString();
            indexName = StringCache.TryToIntern(indexName);
            return err;
        }

        #region JetGetTableInfo overloads

        /// <summary>
        /// Retrieves various pieces of information about a table in a database.
        /// </summary>
        /// <remarks>
        /// This overload is used with <see cref="JET_TblInfo.Default"/>.
        /// </remarks>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The table to retrieve information about.</param>
        /// <param name="result">Retrieved information.</param>
        /// <param name="infoLevel">The type of information to retrieve.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetGetTableInfo(JET_SESID sesid, JET_TABLEID tableid, out JET_OBJECTINFO result, JET_TblInfo infoLevel)
        {
            TraceFunctionCall();
            var nativeResult = new NATIVE_OBJECTINFO();
            int err;

            if (this.Capabilities.SupportsVistaFeatures)
            {
                err = Err(
                    NativeMethods.JetGetTableInfoW(
                        sesid.Value,
                        tableid.Value,
                        out nativeResult,
                        checked((uint)Marshal.SizeOf(typeof(NATIVE_OBJECTINFO))),
                        (uint)infoLevel));
            }
            else
            {
#if MANAGEDESENT_ON_WSA
                err = Err((int)JET_err.FeatureNotAvailable);
#else
                err = Err(
                    NativeMethods.JetGetTableInfo(
                        sesid.Value,
                        tableid.Value,
                        out nativeResult,
                        checked((uint)Marshal.SizeOf(typeof(NATIVE_OBJECTINFO))),
                        (uint)infoLevel));
#endif
            }

            result = new JET_OBJECTINFO();
            result.SetFromNativeObjectinfo(ref nativeResult);
            return err;
        }

        /// <summary>
        /// Retrieves various pieces of information about a table in a database.
        /// </summary>
        /// <remarks>
        /// This overload is used with <see cref="JET_TblInfo.Name"/> and
        /// <see cref="JET_TblInfo.TemplateTableName"/>.
        /// </remarks>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The table to retrieve information about.</param>
        /// <param name="result">Retrieved information.</param>
        /// <param name="infoLevel">The type of information to retrieve.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetGetTableInfo(JET_SESID sesid, JET_TABLEID tableid, out string result, JET_TblInfo infoLevel)
        {
            TraceFunctionCall();
            var resultBuffer = new StringBuilder(SystemParameters.NameMost + 1);
            int err;

            if (this.Capabilities.SupportsVistaFeatures)
            {
                err = Err(NativeMethods.JetGetTableInfoW(
                    sesid.Value, tableid.Value, resultBuffer, (uint)resultBuffer.Capacity * sizeof(char), (uint)infoLevel));
            }
            else
            {
#if MANAGEDESENT_ON_WSA
                err = Err((int)JET_err.FeatureNotAvailable);
#else
                err = Err(NativeMethods.JetGetTableInfo(
                    sesid.Value, tableid.Value, resultBuffer, (uint)resultBuffer.Capacity, (uint)infoLevel));
#endif
            }

            result = resultBuffer.ToString();
            result = StringCache.TryToIntern(result);
            return err;
        }

        /// <summary>
        /// Retrieves various pieces of information about a table in a database.
        /// </summary>
        /// <remarks>
        /// This overload is used with <see cref="JET_TblInfo.Dbid"/>.
        /// </remarks>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The table to retrieve information about.</param>
        /// <param name="result">Retrieved information.</param>
        /// <param name="infoLevel">The type of information to retrieve.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetGetTableInfo(JET_SESID sesid, JET_TABLEID tableid, out JET_DBID result, JET_TblInfo infoLevel)
        {
            TraceFunctionCall();
            result = JET_DBID.Nil;

            if (this.Capabilities.SupportsVistaFeatures)
            {
                return Err(NativeMethods.JetGetTableInfoW(sesid.Value, tableid.Value, out result.Value, sizeof(uint), (uint)infoLevel));
            }
            else
            {
#if MANAGEDESENT_ON_WSA
                return Err((int)JET_err.FeatureNotAvailable);
#else
                return Err(NativeMethods.JetGetTableInfo(sesid.Value, tableid.Value, out result.Value, sizeof(uint), (uint)infoLevel));
#endif
            }
        }

        /// <summary>
        /// Retrieves various pieces of information about a table in a database.
        /// </summary>
        /// <remarks>
        /// This overload is used with <see cref="JET_TblInfo.SpaceUsage"/> and
        /// <see cref="JET_TblInfo.SpaceAlloc"/>.
        /// </remarks>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The table to retrieve information about.</param>
        /// <param name="result">Retrieved information.</param>
        /// <param name="infoLevel">The type of information to retrieve.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetGetTableInfo(JET_SESID sesid, JET_TABLEID tableid, int[] result, JET_TblInfo infoLevel)
        {
            TraceFunctionCall();
            CheckNotNull(result, "result");

            uint bytesResult = checked((uint)(result.Length * sizeof(int)));
            if (this.Capabilities.SupportsVistaFeatures)
            {
                return Err(NativeMethods.JetGetTableInfoW(sesid.Value, tableid.Value, result, bytesResult, (uint)infoLevel));
            }
            else
            {
#if MANAGEDESENT_ON_WSA
                return Err((int)JET_err.FeatureNotAvailable);
#else
                return Err(NativeMethods.JetGetTableInfo(sesid.Value, tableid.Value, result, bytesResult, (uint)infoLevel));
#endif
            }
        }

        /// <summary>
        /// Retrieves various pieces of information about a table in a database.
        /// </summary>
        /// <remarks>
        /// This overload is used with <see cref="JET_TblInfo.SpaceOwned"/> and
        /// <see cref="JET_TblInfo.SpaceAvailable"/>.
        /// </remarks>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The table to retrieve information about.</param>
        /// <param name="result">Retrieved information.</param>
        /// <param name="infoLevel">The type of information to retrieve.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetGetTableInfo(JET_SESID sesid, JET_TABLEID tableid, out int result, JET_TblInfo infoLevel)
        {
            TraceFunctionCall();
            uint nativeResult;
            int err;
            if (this.Capabilities.SupportsVistaFeatures)
            {
                err = Err(NativeMethods.JetGetTableInfoW(sesid.Value, tableid.Value, out nativeResult, sizeof(uint), (uint)infoLevel));
            }
            else
            {
#if MANAGEDESENT_ON_WSA
                nativeResult = 0;
                err = Err((int)JET_err.FeatureNotAvailable);
#else
                err = Err(NativeMethods.JetGetTableInfo(sesid.Value, tableid.Value, out nativeResult, sizeof(uint), (uint)infoLevel));
#endif
            }

            result = unchecked((int)nativeResult);
            return err;
        }

        #endregion

        #region JetGetIndexInfo overloads

        /// <summary>
        /// Retrieves information about indexes on a table.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="dbid">The database to use.</param>
        /// <param name="tablename">The name of the table to retrieve index information about.</param>
        /// <param name="indexname">The name of the index to retrieve information about.</param>
        /// <param name="result">Filled in with information about indexes on the table.</param>
        /// <param name="infoLevel">The type of information to retrieve.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetGetIndexInfo(
            JET_SESID sesid,
            JET_DBID dbid,
            string tablename,
            string indexname,
            out ushort result,
            JET_IdxInfo infoLevel)
        {
            TraceFunctionCall();
            CheckNotNull(tablename, "tablename");
            int err;

            if (this.Capabilities.SupportsVistaFeatures)
            {
                err = Err(NativeMethods.JetGetIndexInfoW(
                    sesid.Value,
                    dbid.Value,
                    tablename,
                    indexname,
                    out result,
                    sizeof(ushort),
                    (uint)infoLevel));
            }
            else
            {
#if MANAGEDESENT_ON_WSA
                result = 0;
                err = Err((int)JET_err.FeatureNotAvailable);
#else
                err = Err(NativeMethods.JetGetIndexInfo(
                    sesid.Value,
                    dbid.Value,
                    tablename,
                    indexname,
                    out result,
                    sizeof(ushort),
                    (uint)infoLevel));
#endif
            }

            return err;
        }

        /// <summary>
        /// Retrieves information about indexes on a table.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="dbid">The database to use.</param>
        /// <param name="tablename">The name of the table to retrieve index information about.</param>
        /// <param name="indexname">The name of the index to retrieve information about.</param>
        /// <param name="result">Filled in with information about indexes on the table.</param>
        /// <param name="infoLevel">The type of information to retrieve.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetGetIndexInfo(
            JET_SESID sesid,
            JET_DBID dbid,
            string tablename,
            string indexname,
            out int result,
            JET_IdxInfo infoLevel)
        {
            TraceFunctionCall();
            CheckNotNull(tablename, "tablename");

            uint nativeResult;
            int err;

            if (this.Capabilities.SupportsVistaFeatures)
            {
                err = Err(NativeMethods.JetGetIndexInfoW(
                    sesid.Value,
                    dbid.Value,
                    tablename,
                    indexname,
                    out nativeResult,
                    sizeof(uint),
                    (uint)infoLevel));
            }
            else
            {
#if MANAGEDESENT_ON_WSA
                nativeResult = 0;
                err = Err((int)JET_err.FeatureNotAvailable);
#else
                err = Err(NativeMethods.JetGetIndexInfo(
                    sesid.Value,
                    dbid.Value,
                    tablename,
                    indexname,
                    out nativeResult,
                    sizeof(uint),
                    (uint)infoLevel));
#endif
            }

            result = unchecked((int)nativeResult);
            return err;
        }

        /// <summary>
        /// Retrieves information about indexes on a table.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="dbid">The database to use.</param>
        /// <param name="tablename">The name of the table to retrieve index information about.</param>
        /// <param name="indexname">The name of the index to retrieve information about.</param>
        /// <param name="result">Filled in with information about indexes on the table.</param>
        /// <param name="infoLevel">The type of information to retrieve.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetGetIndexInfo(
            JET_SESID sesid,
            JET_DBID dbid,
            string tablename,
            string indexname,
            out JET_INDEXID result,
            JET_IdxInfo infoLevel)
        {
            TraceFunctionCall();
            CheckNotNull(tablename, "tablename");

            int err;

            if (this.Capabilities.SupportsVistaFeatures)
            {
                err = Err(NativeMethods.JetGetIndexInfoW(
                    sesid.Value,
                    dbid.Value,
                    tablename,
                    indexname,
                    out result,
                    JET_INDEXID.SizeOfIndexId,
                    (uint)infoLevel));
            }
            else
            {
#if MANAGEDESENT_ON_WSA
                result = new JET_INDEXID();
                err = Err((int)JET_err.FeatureNotAvailable);
#else
                err = Err(NativeMethods.JetGetIndexInfo(
                    sesid.Value,
                    dbid.Value,
                    tablename,
                    indexname,
                    out result,
                    JET_INDEXID.SizeOfIndexId,
                    (uint)infoLevel));
#endif
            }

            return err;
        }

        /// <summary>
        /// Retrieves information about indexes on a table.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="dbid">The database to use.</param>
        /// <param name="tablename">The name of the table to retrieve index information about.</param>
        /// <param name="indexname">The name of the index to retrieve information about.</param>
        /// <param name="result">Filled in with information about indexes on the table.</param>
        /// <param name="infoLevel">The type of information to retrieve.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetGetIndexInfo(
            JET_SESID sesid,
            JET_DBID dbid,
            string tablename,
            string indexname,
            out JET_INDEXLIST result,
            JET_IdxInfo infoLevel)
        {
            TraceFunctionCall();
            CheckNotNull(tablename, "tablename");
            int err;

            var nativeIndexlist = new NATIVE_INDEXLIST();
            nativeIndexlist.cbStruct = checked((uint)Marshal.SizeOf(typeof(NATIVE_INDEXLIST)));
            if (this.Capabilities.SupportsVistaFeatures)
            {
                err = Err(NativeMethods.JetGetIndexInfoW(
                    sesid.Value,
                    dbid.Value,
                    tablename,
                    indexname,
                    ref nativeIndexlist,
                    nativeIndexlist.cbStruct,
                    (uint)infoLevel));
            }
            else
            {
#if MANAGEDESENT_ON_WSA
                err = Err((int)JET_err.FeatureNotAvailable);
#else
                err = Err(NativeMethods.JetGetIndexInfo(
                sesid.Value,
                dbid.Value,
                tablename,
                indexname,
                ref nativeIndexlist,
                nativeIndexlist.cbStruct,
                (uint)infoLevel));
#endif
            }

            result = new JET_INDEXLIST();
            result.SetFromNativeIndexlist(nativeIndexlist);

            return err;
        }

        /// <summary>
        /// Retrieves information about indexes on a table.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="dbid">The database to use.</param>
        /// <param name="tablename">The name of the table to retrieve index information about.</param>
        /// <param name="indexname">The name of the index to retrieve information about.</param>
        /// <param name="result">Filled in with information about indexes on the table.</param>
        /// <param name="infoLevel">The type of information to retrieve.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetGetIndexInfo(
            JET_SESID sesid,
            JET_DBID dbid,
            string tablename,
            string indexname,
            out string result,
            JET_IdxInfo infoLevel)
        {
            TraceFunctionCall();
            CheckNotNull(tablename, "tablename");
            int err;

            // Will need to check for Windows 8 Features.
            //
            // Currently only JET_IdxInfo.LocaleName is supported.
            uint bytesMax = checked((uint)SystemParameters.LocaleNameMaxLength * sizeof(char));

            var stringBuilder = new StringBuilder(SystemParameters.LocaleNameMaxLength);
            err = Err(NativeMethods.JetGetIndexInfoW(
                sesid.Value,
                dbid.Value,
                tablename,
                indexname,
                stringBuilder,
                bytesMax,
                (uint)infoLevel));

            result = stringBuilder.ToString();
            result = StringCache.TryToIntern(result);
            return err;
        }

        #endregion

        #region JetGetTableIndexInfo overloads

        /// <summary>
        /// Retrieves information about indexes on a table.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The table to retrieve index information about.</param>
        /// <param name="indexname">The name of the index.</param>
        /// <param name="result">Filled in with information about indexes on the table.</param>
        /// <param name="infoLevel">The type of information to retrieve.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetGetTableIndexInfo(
            JET_SESID sesid,
            JET_TABLEID tableid,
            string indexname,
            out ushort result,
            JET_IdxInfo infoLevel)
        {
            TraceFunctionCall();
            int err;

            if (this.Capabilities.SupportsVistaFeatures)
            {
                err = Err(NativeMethods.JetGetTableIndexInfoW(
                    sesid.Value,
                    tableid.Value,
                    indexname,
                    out result,
                    sizeof(ushort),
                    (uint)infoLevel));
            }
            else
            {
#if MANAGEDESENT_ON_WSA
                result = 0;
                err = Err((int)JET_err.FeatureNotAvailable);
#else
                err = Err(NativeMethods.JetGetTableIndexInfo(
                    sesid.Value,
                    tableid.Value,
                    indexname,
                    out result,
                    sizeof(ushort),
                    (uint)infoLevel));
#endif
            }

            return err;
        }

        /// <summary>
        /// Retrieves information about indexes on a table.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The table to retrieve index information about.</param>
        /// <param name="indexname">The name of the index.</param>
        /// <param name="result">Filled in with information about indexes on the table.</param>
        /// <param name="infoLevel">The type of information to retrieve.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetGetTableIndexInfo(
            JET_SESID sesid,
            JET_TABLEID tableid,
            string indexname,
            out int result,
            JET_IdxInfo infoLevel)
        {
            TraceFunctionCall();

            uint nativeResult;
            int err;

            if (this.Capabilities.SupportsVistaFeatures)
            {
                err = Err(NativeMethods.JetGetTableIndexInfoW(
                    sesid.Value,
                    tableid.Value,
                    indexname,
                    out nativeResult,
                    sizeof(uint),
                    (uint)infoLevel));
            }
            else
            {
#if MANAGEDESENT_ON_WSA
                nativeResult = 0;
                err = Err((int)JET_err.FeatureNotAvailable);
#else
                err = Err(NativeMethods.JetGetTableIndexInfo(
                    sesid.Value,
                    tableid.Value,
                    indexname,
                    out nativeResult,
                    sizeof(uint),
                    (uint)infoLevel));
#endif
            }

            result = unchecked((int)nativeResult);
            return err;
        }

        /// <summary>
        /// Retrieves information about indexes on a table.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The table to retrieve index information about.</param>
        /// <param name="indexname">The name of the index.</param>
        /// <param name="result">Filled in with information about indexes on the table.</param>
        /// <param name="infoLevel">The type of information to retrieve.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetGetTableIndexInfo(
            JET_SESID sesid,
            JET_TABLEID tableid,
            string indexname,
            out JET_INDEXID result,
            JET_IdxInfo infoLevel)
        {
            TraceFunctionCall();
            int err;

            if (this.Capabilities.SupportsVistaFeatures)
            {
                err = Err(NativeMethods.JetGetTableIndexInfoW(
                    sesid.Value,
                    tableid.Value,
                    indexname,
                    out result,
                    JET_INDEXID.SizeOfIndexId,
                    (uint)infoLevel));
            }
            else
            {
#if MANAGEDESENT_ON_WSA
                result = new JET_INDEXID();
                err = Err((int)JET_err.FeatureNotAvailable);
#else
                err = Err(NativeMethods.JetGetTableIndexInfo(
                    sesid.Value,
                    tableid.Value,
                    indexname,
                    out result,
                    JET_INDEXID.SizeOfIndexId,
                    (uint)infoLevel));
#endif
            }

            return err;
        }

        /// <summary>
        /// Retrieves information about indexes on a table.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The table to retrieve index information about.</param>
        /// <param name="indexname">The name of the index.</param>
        /// <param name="result">Filled in with information about indexes on the table.</param>
        /// <param name="infoLevel">The type of information to retrieve.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetGetTableIndexInfo(
            JET_SESID sesid,
            JET_TABLEID tableid,
            string indexname,
            out JET_INDEXLIST result,
            JET_IdxInfo infoLevel)
        {
            TraceFunctionCall();

            var nativeIndexlist = new NATIVE_INDEXLIST();
            nativeIndexlist.cbStruct = checked((uint)Marshal.SizeOf(typeof(NATIVE_INDEXLIST)));
            int err;

            if (this.Capabilities.SupportsVistaFeatures)
            {
                err = Err(NativeMethods.JetGetTableIndexInfoW(
                    sesid.Value,
                    tableid.Value,
                    indexname,
                    ref nativeIndexlist,
                    nativeIndexlist.cbStruct,
                    (uint)infoLevel));
            }
            else
            {
#if MANAGEDESENT_ON_WSA
                err = Err((int)JET_err.FeatureNotAvailable);
#else
                err = Err(NativeMethods.JetGetTableIndexInfo(
                    sesid.Value,
                    tableid.Value,
                    indexname,
                    ref nativeIndexlist,
                    nativeIndexlist.cbStruct,
                    (uint)infoLevel));
#endif
            }

            result = new JET_INDEXLIST();
            result.SetFromNativeIndexlist(nativeIndexlist);

            return err;
        }

        /// <summary>
        /// Retrieves information about indexes on a table.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The table to retrieve index information about.</param>
        /// <param name="indexname">The name of the index.</param>
        /// <param name="result">Filled in with information about indexes on the table.</param>
        /// <param name="infoLevel">The type of information to retrieve.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetGetTableIndexInfo(
            JET_SESID sesid,
            JET_TABLEID tableid,
            string indexname,
            out string result,
            JET_IdxInfo infoLevel)
        {
            TraceFunctionCall();

            // Will need to check for Windows 8 Features.
            //
            // Currently only JET_IdxInfo.LocaleName is supported.
            uint bytesMax = checked((uint)SystemParameters.LocaleNameMaxLength * sizeof(char));

            var stringBuilder = new StringBuilder(SystemParameters.LocaleNameMaxLength);
            int err;
            err = Err(NativeMethods.JetGetTableIndexInfoW(
                sesid.Value,
                tableid.Value,
                indexname,
                stringBuilder,
                bytesMax,
                (uint)infoLevel));

            result = stringBuilder.ToString();
            result = StringCache.TryToIntern(result);
            return err;
        }

        #endregion

        /// <summary>
        /// Changes the name of an existing table.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="dbid">The database containing the table.</param>
        /// <param name="tableName">The name of the table.</param>
        /// <param name="newTableName">The new name of the table.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetRenameTable(JET_SESID sesid, JET_DBID dbid, string tableName, string newTableName)
        {
            TraceFunctionCall();
            CheckNotNull(tableName, "tableName");
            CheckNotNull(newTableName, "newTableName");
#if MANAGEDESENT_ON_WSA
            return Err(NativeMethods.JetRenameTableW(sesid.Value, dbid.Value, tableName, newTableName));
#else
            return Err(NativeMethods.JetRenameTable(sesid.Value, dbid.Value, tableName, newTableName));
#endif
        }

        /// <summary>
        /// Changes the name of an existing column.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The table containing the column.</param>
        /// <param name="name">The name of the column.</param>
        /// <param name="newName">The new name of the column.</param>
        /// <param name="grbit">Column rename options.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetRenameColumn(JET_SESID sesid, JET_TABLEID tableid, string name, string newName, RenameColumnGrbit grbit)
        {
            TraceFunctionCall();
            CheckNotNull(name, "name");
            CheckNotNull(newName, "newName");
#if MANAGEDESENT_ON_WSA
            return Err(
                NativeMethods.JetRenameColumnW(sesid.Value, tableid.Value, name, newName, (uint)grbit));
#else
            return Err(
                NativeMethods.JetRenameColumn(sesid.Value, tableid.Value, name, newName, (uint)grbit));
#endif
        }

#if !MANAGEDESENT_ON_WSA // Not exposed in MSDK
        /// <summary>
        /// Changes the default value of an existing column.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="dbid">The database containing the column.</param>
        /// <param name="tableName">The name of the table containing the column.</param>
        /// <param name="columnName">The name of the column.</param>
        /// <param name="data">The new default value.</param>
        /// <param name="dataSize">Size of the new default value.</param>
        /// <param name="grbit">Column default value options.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetSetColumnDefaultValue(
            JET_SESID sesid, JET_DBID dbid, string tableName, string columnName, byte[] data, int dataSize, SetColumnDefaultValueGrbit grbit)
        {
            TraceFunctionCall();
            CheckNotNull(tableName, "tableName");
            CheckNotNull(columnName, "columnName");
            CheckDataSize(data, dataSize, "dataSize");
            return Err(
                NativeMethods.JetSetColumnDefaultValue(
                    sesid.Value, dbid.Value, tableName, columnName, data, checked((uint)dataSize), (uint)grbit));
        }
#endif // !MANAGEDESENT_ON_WSA

        #endregion

        #region Navigation

        /// <summary>
        /// Positions a cursor to an index entry for the record that is associated with
        /// the specified bookmark. The bookmark can be used with any index defined over
        /// a table. The bookmark for a record can be retrieved using <see cref="IJetApi.JetGetBookmark"/>.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The cursor to position.</param>
        /// <param name="bookmark">The bookmark used to position the cursor.</param>
        /// <param name="bookmarkSize">The size of the bookmark.</param>        /// <returns>An error if the call fails.</returns>
        public int JetGotoBookmark(JET_SESID sesid, JET_TABLEID tableid, byte[] bookmark, int bookmarkSize)
        {
            TraceFunctionCall();
            CheckNotNull(bookmark, "bookmark");
            CheckDataSize(bookmark, bookmarkSize, "bookmarkSize");

            return
                Err(
                    NativeMethods.JetGotoBookmark(
                        sesid.Value, tableid.Value, bookmark, checked((uint)bookmarkSize)));
        }

        /// <summary>
        /// Positions a cursor to an index entry that is associated with the
        /// specified secondary index bookmark. The secondary index bookmark
        /// must be used with the same index over the same table from which it
        /// was originally retrieved. The secondary index bookmark for an index
        /// entry can be retrieved using <see cref="JetGotoSecondaryIndexBookmark"/>.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The table cursor to position.</param>
        /// <param name="secondaryKey">The buffer that contains the secondary key.</param>
        /// <param name="secondaryKeySize">The size of the secondary key.</param>
        /// <param name="primaryKey">The buffer that contains the primary key.</param>
        /// <param name="primaryKeySize">The size of the primary key.</param>
        /// <param name="grbit">Options for positioning the bookmark.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetGotoSecondaryIndexBookmark(
            JET_SESID sesid,
            JET_TABLEID tableid,
            byte[] secondaryKey,
            int secondaryKeySize,
            byte[] primaryKey,
            int primaryKeySize,
            GotoSecondaryIndexBookmarkGrbit grbit)
        {
            TraceFunctionCall();
            CheckNotNull(secondaryKey, "secondaryKey");
            CheckDataSize(secondaryKey, secondaryKeySize, "secondaryKeySize");
            CheckDataSize(primaryKey, primaryKeySize, "primaryKeySize");

            return
                Err(
                    NativeMethods.JetGotoSecondaryIndexBookmark(
                        sesid.Value,
                        tableid.Value,
                        secondaryKey,
                        checked((uint)secondaryKeySize),
                        primaryKey,
                        checked((uint)primaryKeySize),
                        (uint)grbit));
        }

        /// <summary>
        /// Constructs search keys that may then be used by <see cref="IJetApi.JetSeek"/> and <see cref="IJetApi.JetSetIndexRange"/>.
        /// </summary>
        /// <remarks>
        /// The MakeKey functions provide datatype-specific make key functionality.
        /// </remarks>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The cursor to create the key on.</param>
        /// <param name="data">Column data for the current key column of the current index.</param>
        /// <param name="dataSize">Size of the data.</param>
        /// <param name="grbit">Key options.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetMakeKey(JET_SESID sesid, JET_TABLEID tableid, IntPtr data, int dataSize, MakeKeyGrbit grbit)
        {
            TraceFunctionCall();
            CheckNotNegative(dataSize, "dataSize");
            return Err(NativeMethods.JetMakeKey(sesid.Value, tableid.Value, data, checked((uint)dataSize), unchecked((uint)grbit)));
        }

        /// <summary>
        /// Efficiently positions a cursor to an index entry that matches the search
        /// criteria specified by the search key in that cursor and the specified
        /// inequality. A search key must have been previously constructed using
        /// JetMakeKey.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The cursor to position.</param>
        /// <param name="grbit">Seek options.</param>
        /// <returns>An error or warning..</returns>
        public int JetSeek(JET_SESID sesid, JET_TABLEID tableid, SeekGrbit grbit)
        {
            TraceFunctionCall();
            return Err(NativeMethods.JetSeek(sesid.Value, tableid.Value, unchecked((uint)grbit)));
        }

        /// <summary>
        /// Navigate through an index. The cursor can be positioned at the start or
        /// end of the index and moved backwards and forwards by a specified number
        /// of index entries.
        /// </summary>
        /// <param name="sesid">The session to use for the call.</param>
        /// <param name="tableid">The cursor to position.</param>
        /// <param name="numRows">An offset which indicates how far to move the cursor.</param>
        /// <param name="grbit">Move options.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetMove(JET_SESID sesid, JET_TABLEID tableid, int numRows, MoveGrbit grbit)
        {
            TraceFunctionCall();
            return Err(NativeMethods.JetMove(sesid.Value, tableid.Value, numRows, unchecked((uint)grbit)));
        }

        /// <summary>
        /// Temporarily limits the set of index entries that the cursor can walk using
        /// <see cref="IJetApi.JetMove"/> to those starting
        /// from the current index entry and ending at the index entry that matches the
        /// search criteria specified by the search key in that cursor and the specified
        /// bound criteria. A search key must have been previously constructed using
        /// JetMakeKey.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The cursor to set the index range on.</param>
        /// <param name="grbit">Index range options.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetSetIndexRange(JET_SESID sesid, JET_TABLEID tableid, SetIndexRangeGrbit grbit)
        {
            TraceFunctionCall();
            return Err(NativeMethods.JetSetIndexRange(sesid.Value, tableid.Value, unchecked((uint)grbit)));
        }

        /// <summary>
        /// Computes the intersection between multiple sets of index entries from different secondary
        /// indices over the same table. This operation is useful for finding the set of records in a
        /// table that match two or more criteria that can be expressed using index ranges.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="ranges">
        /// An the index ranges to intersect. The tableids in the ranges
        ///  must have index ranges set on them.
        /// </param>
        /// <param name="numRanges">
        /// The number of index ranges.
        /// </param>
        /// <param name="recordlist">
        /// Returns information about the temporary table containing the intersection results.
        /// </param>
        /// <param name="grbit">Intersection options.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetIntersectIndexes(
            JET_SESID sesid,
            JET_INDEXRANGE[] ranges,
            int numRanges,
            out JET_RECORDLIST recordlist,
            IntersectIndexesGrbit grbit)
        {
            TraceFunctionCall();
            CheckNotNull(ranges, "ranges");
            CheckDataSize(ranges, numRanges, "numRanges");
            if (numRanges < 2)
            {
                throw new ArgumentOutOfRangeException(
                    "numRanges", numRanges, "JetIntersectIndexes requires at least two index ranges.");
            }

            var indexRanges = new NATIVE_INDEXRANGE[numRanges];
            for (int i = 0; i < numRanges; ++i)
            {
                indexRanges[i] = ranges[i].GetNativeIndexRange();
            }

            var nativeRecordlist = new NATIVE_RECORDLIST();
            nativeRecordlist.cbStruct = checked((uint)Marshal.SizeOf(typeof(NATIVE_RECORDLIST)));

            int err = Err(
                        NativeMethods.JetIntersectIndexes(
                            sesid.Value,
                            indexRanges,
                            checked((uint)indexRanges.Length),
                            ref nativeRecordlist,
                            (uint)grbit));
            recordlist = new JET_RECORDLIST();
            recordlist.SetFromNativeRecordlist(nativeRecordlist);
            return err;
        }

        /// <summary>
        /// Set the current index of a cursor.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The cursor to set the index on.</param>
        /// <param name="index">
        /// The name of the index to be selected. If this is null or empty the primary
        /// index will be selected.
        /// </param>
        /// <returns>An error if the call fails.</returns>
        public int JetSetCurrentIndex(JET_SESID sesid, JET_TABLEID tableid, string index)
        {
#if MANAGEDESENT_ON_WSA
            return this.JetSetCurrentIndex4(sesid, tableid, index, IntPtr.Zero, SetCurrentIndexGrbit.MoveFirst, 1);
#else
            TraceFunctionCall();

            // A null index name is valid here -- it will set the table to the primary index
            return Err(NativeMethods.JetSetCurrentIndex(sesid.Value, tableid.Value, index));
#endif
        }

        /// <summary>
        /// Set the current index of a cursor.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The cursor to set the index on.</param>
        /// <param name="index">
        /// The name of the index to be selected. If this is null or empty the primary
        /// index will be selected.
        /// </param>
        /// <param name="grbit">
        /// Set index options.
        /// </param>
        /// <returns>An error if the call fails.</returns>
        public int JetSetCurrentIndex2(JET_SESID sesid, JET_TABLEID tableid, string index, SetCurrentIndexGrbit grbit)
        {
#if MANAGEDESENT_ON_WSA
            return this.JetSetCurrentIndex4(sesid, tableid, index, IntPtr.Zero, grbit, 1);
#else
            TraceFunctionCall();

            // A null index name is valid here -- it will set the table to the primary index
            return Err(NativeMethods.JetSetCurrentIndex2(sesid.Value, tableid.Value, index, (uint)grbit));
#endif
        }

        /// <summary>
        /// Set the current index of a cursor.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The cursor to set the index on.</param>
        /// <param name="index">
        /// The name of the index to be selected. If this is null or empty the primary
        /// index will be selected.
        /// </param>
        /// <param name="grbit">
        /// Set index options.
        /// </param>
        /// <param name="itagSequence">
        /// Sequence number of the multi-valued column value which will be used
        /// to position the cursor on the new index. This parameter is only used
        /// in conjunction with <see cref="SetCurrentIndexGrbit.NoMove"/>. When
        /// this parameter is not present or is set to zero, its value is presumed
        /// to be 1.
        /// </param>
        /// <returns>An error if the call fails.</returns>
        public int JetSetCurrentIndex3(JET_SESID sesid, JET_TABLEID tableid, string index, SetCurrentIndexGrbit grbit, int itagSequence)
        {
#if MANAGEDESENT_ON_WSA
            return this.JetSetCurrentIndex4(sesid, tableid, index, IntPtr.Zero, grbit, itagSequence);
#else
            TraceFunctionCall();

            // A null index name is valid here -- it will set the table to the primary index
            return Err(NativeMethods.JetSetCurrentIndex3(sesid.Value, tableid.Value, index, (uint)grbit, checked((uint)itagSequence)));
#endif
        }

        /// <summary>
        /// Set the current index of a cursor.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The cursor to set the index on.</param>
        /// <param name="index">
        /// The name of the index to be selected. If this is null or empty the primary
        /// index will be selected.
        /// </param>
        /// <param name="indexid">
        /// The id of the index to select. This id can be obtained using JetGetIndexInfo
        /// or JetGetTableIndexInfo with the <see cref="JET_IdxInfo.IndexId"/> option.
        /// </param>
        /// <param name="grbit">
        /// Set index options.
        /// </param>
        /// <param name="itagSequence">
        /// Sequence number of the multi-valued column value which will be used
        /// to position the cursor on the new index. This parameter is only used
        /// in conjunction with <see cref="SetCurrentIndexGrbit.NoMove"/>. When
        /// this parameter is not present or is set to zero, its value is presumed
        /// to be 1.
        /// </param>
        /// <returns>An error if the call fails.</returns>
        public int JetSetCurrentIndex4(
            JET_SESID sesid,
            JET_TABLEID tableid,
            string index,
            JET_INDEXID indexid,
            SetCurrentIndexGrbit grbit,
            int itagSequence)
        {
            TraceFunctionCall();

            // A null index name is valid here -- it will set the table to the primary index
#if MANAGEDESENT_ON_WSA
            return Err(NativeMethods.JetSetCurrentIndex4W(sesid.Value, tableid.Value, index, ref indexid, (uint)grbit, checked((uint)itagSequence)));
#else
            return Err(NativeMethods.JetSetCurrentIndex4(sesid.Value, tableid.Value, index, ref indexid, (uint)grbit, checked((uint)itagSequence)));
#endif
        }

        /// <summary>
        /// Counts the number of entries in the current index from the current position forward.
        /// The current position is included in the count. The count can be greater than the
        /// total number of records in the table if the current index is over a multi-valued
        /// column and instances of the column have multiple-values. If the table is empty,
        /// then 0 will be returned for the count.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The cursor to count the records in.</param>
        /// <param name="numRecords">Returns the number of records.</param>
        /// <param name="maxRecordsToCount">
        /// The maximum number of records to count.
        /// </param>
        /// <returns>An error if the call fails.</returns>
        public int JetIndexRecordCount(JET_SESID sesid, JET_TABLEID tableid, out int numRecords, int maxRecordsToCount)
        {
            TraceFunctionCall();
            CheckNotNegative(maxRecordsToCount, "maxRecordsToCount");
            uint crec = 0;
            int err = Err(NativeMethods.JetIndexRecordCount(sesid.Value, tableid.Value, out crec, unchecked((uint)maxRecordsToCount))); // -1 is allowed
            numRecords = checked((int)crec);
            return err;
        }

        /// <summary>
        /// Counts the number of entries in the current index from the current position forward.
        /// The current position is included in the count. The count can be greater than the
        /// total number of records in the table if the current index is over a multi-valued
        /// column and instances of the column have multiple-values. If the table is empty,
        /// then 0 will be returned for the count.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The cursor to count the records in.</param>
        /// <param name="numRecords">Returns the number of records.</param>
        /// <param name="maxRecordsToCount">
        /// The maximum number of records to count.
        /// </param>
        /// <returns>An error if the call fails.</returns>
        public int JetIndexRecordCount2(JET_SESID sesid, JET_TABLEID tableid, out long numRecords, long maxRecordsToCount)
        {
            TraceFunctionCall();
            CheckNotNegative(maxRecordsToCount, "maxRecordsToCount");
            ulong crec = 0;
            int err = Err(NativeMethods.JetIndexRecordCount2(sesid.Value, tableid.Value, out crec, unchecked((ulong)maxRecordsToCount)));
            numRecords = checked((long)crec);
            return err;
        }

        /// <summary>
        /// Notifies the database engine that the application is scanning the entire
        /// index that the cursor is positioned on. Consequently, the methods that
        /// are used to access the index data will be tuned to make this scenario as
        /// fast as possible.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The cursor that will be accessing the data.</param>
        /// <param name="grbit">Reserved for future use.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetSetTableSequential(JET_SESID sesid, JET_TABLEID tableid, SetTableSequentialGrbit grbit)
        {
            TraceFunctionCall();
            return Err(NativeMethods.JetSetTableSequential(sesid.Value, tableid.Value, (uint)grbit));
        }

        /// <summary>
        /// Notifies the database engine that the application is no longer scanning the
        /// entire index the cursor is positioned on. This call reverses a notification
        /// sent by JetSetTableSequential.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The cursor that was accessing the data.</param>
        /// <param name="grbit">Reserved for future use.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetResetTableSequential(JET_SESID sesid, JET_TABLEID tableid, ResetTableSequentialGrbit grbit)
        {
            TraceFunctionCall();
            return Err(NativeMethods.JetResetTableSequential(sesid.Value, tableid.Value, (uint)grbit));
        }

        /// <summary>
        /// Returns the fractional position of the current record in the current index
        /// in the form of a JET_RECPOS structure.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The cursor positioned on the record.</param>
        /// <param name="recpos">Returns the approximate fractional position of the record.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetGetRecordPosition(JET_SESID sesid, JET_TABLEID tableid, out JET_RECPOS recpos)
        {
            TraceFunctionCall();
            recpos = new JET_RECPOS();
            NATIVE_RECPOS native = recpos.GetNativeRecpos();
            int err = Err(NativeMethods.JetGetRecordPosition(sesid.Value, tableid.Value, out native, native.cbStruct));
            recpos.SetFromNativeRecpos(native);
            return err;
        }

        /// <summary>
        /// Moves a cursor to a new location that is a fraction of the way through
        /// the current index.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The cursor to position.</param>
        /// <param name="recpos">The approximate position to move to.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetGotoPosition(JET_SESID sesid, JET_TABLEID tableid, JET_RECPOS recpos)
        {
            TraceFunctionCall();
            NATIVE_RECPOS native = recpos.GetNativeRecpos();
            return Err(NativeMethods.JetGotoPosition(sesid.Value, tableid.Value, ref native));
        }

        /// <summary>
        /// If the records with the specified keys are not in the buffer cache
        /// then start asynchronous reads to bring the records into the database
        /// buffer cache.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The table to issue the prereads against.</param>
        /// <param name="keys">
        /// The keys to preread. The keys must be sorted.
        /// </param>
        /// <param name="keyLengths">The lengths of the keys to preread.</param>
        /// <param name="keyIndex">
        /// The index of the first key in the keys array to read.
        /// </param>
        /// <param name="keyCount">
        /// The maximum number of keys to preread.
        /// </param>
        /// <param name="keysPreread">
        /// Returns the number of keys to actually preread.
        /// </param>
        /// <param name="grbit">
        /// Preread options. Used to specify the direction of the preread.
        /// </param>
        /// <returns>An error or warning.</returns>
        public int JetPrereadKeys(
            JET_SESID sesid,
            JET_TABLEID tableid,
            byte[][] keys,
            int[] keyLengths,
            int keyIndex,
            int keyCount,
            out int keysPreread,
            PrereadKeysGrbit grbit)
        {
            TraceFunctionCall();
            this.CheckSupportsWindows7Features("JetPrereadKeys");
            CheckDataSize(keys, keyIndex, "keyIndex", keyCount, "keyCount");
            CheckDataSize(keyLengths, keyIndex, "keyIndex", keyCount, "keyCount");
            CheckNotNull(keys, "keys");
            CheckNotNull(keyLengths, "keyLengths");

            int err;
            unsafe
            {
                void** rgpvKeys = stackalloc void*[keyCount]; // [7/21/2010] StyleCop error? You need at least the 4.4 release of StyleCop
                uint* rgcbKeys = stackalloc uint[keyCount];
                using (var gchandlecollection = new GCHandleCollection())
                {
                    gchandlecollection.SetCapacity(keyCount);

                    for (int i = 0; i < keyCount; ++i)
                    {
                        rgpvKeys[i] = (void*)gchandlecollection.Add(keys[keyIndex + i]);
                        rgcbKeys[i] = checked((uint)keyLengths[keyIndex + i]);
                    }

                    err = Err(NativeMethods.JetPrereadKeys(
                                sesid.Value, tableid.Value, rgpvKeys, rgcbKeys, keyCount, out keysPreread, (uint)grbit));
                }
            }

            return err;
        }

        #endregion

        #region Data Retrieval

        /// <summary>
        /// Retrieves the bookmark for the record that is associated with the index entry
        /// at the current position of a cursor. This bookmark can then be used to
        /// reposition that cursor back to the same record using <see cref="IJetApi.JetGotoBookmark"/>.
        /// The bookmark will be no longer than <see cref="SystemParameters.BookmarkMost"/>
        /// bytes.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The cursor to retrieve the bookmark from.</param>
        /// <param name="bookmark">Buffer to contain the bookmark.</param>
        /// <param name="bookmarkSize">Size of the bookmark buffer.</param>
        /// <param name="actualBookmarkSize">Returns the actual size of the bookmark.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetGetBookmark(JET_SESID sesid, JET_TABLEID tableid, byte[] bookmark, int bookmarkSize, out int actualBookmarkSize)
        {
            TraceFunctionCall();
            CheckDataSize(bookmark, bookmarkSize, "bookmarkSize");

            uint bytesActual = 0;
            int err = Err(
                NativeMethods.JetGetBookmark(
                    sesid.Value,
                    tableid.Value,
                    bookmark,
                    checked((uint)bookmarkSize),
                    out bytesActual));

            actualBookmarkSize = GetActualSize(bytesActual);
            return err;
        }

        /// <summary>
        /// Retrieves a special bookmark for the secondary index entry at the
        /// current position of a cursor. This bookmark can then be used to
        /// efficiently reposition that cursor back to the same index entry
        /// using JetGotoSecondaryIndexBookmark. This is most useful when
        /// repositioning on a secondary index that contains duplicate keys or
        /// that contains multiple index entries for the same record.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The cursor to retrieve the bookmark from.</param>
        /// <param name="secondaryKey">Output buffer for the secondary key.</param>
        /// <param name="secondaryKeySize">Size of the secondary key buffer.</param>
        /// <param name="actualSecondaryKeySize">Returns the size of the secondary key.</param>
        /// <param name="primaryKey">Output buffer for the primary key.</param>
        /// <param name="primaryKeySize">Size of the primary key buffer.</param>
        /// <param name="actualPrimaryKeySize">Returns the size of the primary key.</param>
        /// <param name="grbit">Options for the call.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetGetSecondaryIndexBookmark(
            JET_SESID sesid,
            JET_TABLEID tableid,
            byte[] secondaryKey,
            int secondaryKeySize,
            out int actualSecondaryKeySize,
            byte[] primaryKey,
            int primaryKeySize,
            out int actualPrimaryKeySize,
            GetSecondaryIndexBookmarkGrbit grbit)
        {
            TraceFunctionCall();
            CheckDataSize(secondaryKey, secondaryKeySize, "secondaryKeySize");
            CheckDataSize(primaryKey, primaryKeySize, "primaryKeySize");

            uint bytesSecondaryKey = 0;
            uint bytesPrimaryKey = 0;
            int err = Err(
                NativeMethods.JetGetSecondaryIndexBookmark(
                    sesid.Value,
                    tableid.Value,
                    secondaryKey,
                    checked((uint)secondaryKeySize),
                    out bytesSecondaryKey,
                    primaryKey,
                    checked((uint)primaryKeySize),
                    out bytesPrimaryKey,
                    (uint)grbit));

            actualSecondaryKeySize = GetActualSize(bytesSecondaryKey);
            actualPrimaryKeySize = GetActualSize(bytesPrimaryKey);

            return err;
        }

        /// <summary>
        /// Retrieves the key for the index entry at the current position of a cursor.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The cursor to retrieve the key from.</param>
        /// <param name="data">The buffer to retrieve the key into.</param>
        /// <param name="dataSize">The size of the buffer.</param>
        /// <param name="actualDataSize">Returns the actual size of the data.</param>
        /// <param name="grbit">Retrieve key options.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetRetrieveKey(JET_SESID sesid, JET_TABLEID tableid, byte[] data, int dataSize, out int actualDataSize, RetrieveKeyGrbit grbit)
        {
            TraceFunctionCall();
            CheckDataSize(data, dataSize, "dataSize");

            uint bytesActual = 0;
            int err = Err(NativeMethods.JetRetrieveKey(sesid.Value, tableid.Value, data, checked((uint)dataSize), out bytesActual, unchecked((uint)grbit)));

            actualDataSize = GetActualSize(bytesActual);
            return err;
        }

        /// <summary>
        /// Retrieves a single column value from the current record. The record is that
        /// record associated with the index entry at the current position of the cursor.
        /// Alternatively, this function can retrieve a column from a record being created
        /// in the cursor copy buffer. This function can also retrieve column data from an
        /// index entry that references the current record. In addition to retrieving the
        /// actual column value, JetRetrieveColumn can also be used to retrieve the size
        /// of a column, before retrieving the column data itself so that application
        /// buffers can be sized appropriately.
        /// </summary>
        /// <remarks>
        /// The RetrieveColumnAs functions provide datatype-specific retrieval functions.
        /// </remarks>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The cursor to retrieve the column from.</param>
        /// <param name="columnid">The columnid to retrieve.</param>
        /// <param name="data">The data buffer to be retrieved into.</param>
        /// <param name="dataSize">The size of the data buffer.</param>
        /// <param name="actualDataSize">Returns the actual size of the data buffer.</param>
        /// <param name="grbit">Retrieve column options.</param>
        /// <param name="retinfo">
        /// If pretinfo is give as NULL then the function behaves as though an itagSequence
        /// of 1 and an ibLongValue of 0 (zero) were given. This causes column retrieval to
        /// retrieve the first value of a multi-valued column, and to retrieve long data at
        /// offset 0 (zero).
        /// </param>
        /// <returns>An error or warning.</returns>
        public int JetRetrieveColumn(JET_SESID sesid, JET_TABLEID tableid, JET_COLUMNID columnid, IntPtr data, int dataSize, out int actualDataSize, RetrieveColumnGrbit grbit, JET_RETINFO retinfo)
        {
            TraceFunctionCall();
            CheckNotNegative(dataSize, "dataSize");

            int err;
            uint bytesActual = 0;
            if (null != retinfo)
            {
                NATIVE_RETINFO nativeRetinfo = retinfo.GetNativeRetinfo();
                err = Err(NativeMethods.JetRetrieveColumn(
                        sesid.Value,
                        tableid.Value,
                        columnid.Value,
                        data,
                        checked((uint)dataSize),
                        out bytesActual,
                        unchecked((uint)grbit),
                        ref nativeRetinfo));
                retinfo.SetFromNativeRetinfo(nativeRetinfo);
            }
            else
            {
                err = Err(NativeMethods.JetRetrieveColumn(
                        sesid.Value,
                        tableid.Value,
                        columnid.Value,
                        data,
                        checked((uint)dataSize),
                        out bytesActual,
                        unchecked((uint)grbit),
                        IntPtr.Zero));
            }

            actualDataSize = checked((int)bytesActual);
            return err;
        }

        /// <summary>
        /// The JetRetrieveColumns function retrieves multiple column values
        /// from the current record in a single operation. An array of
        /// <see cref="NATIVE_RETRIEVECOLUMN"/> structures is used to
        /// describe the set of column values to be retrieved, and to describe
        /// output buffers for each column value to be retrieved.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The cursor to retrieve columns from.</param>
        /// <param name="retrievecolumns">
        /// An array of one or more JET_RETRIEVECOLUMN structures. Each
        /// structure includes descriptions of which column value to retrieve
        /// and where to store returned data.
        /// </param>
        /// <param name="numColumns">
        /// Number of structures in the array given by retrievecolumns.
        /// </param>
        /// <returns>
        /// An error or warning.
        /// </returns>
        public unsafe int JetRetrieveColumns(JET_SESID sesid, JET_TABLEID tableid, NATIVE_RETRIEVECOLUMN* retrievecolumns, int numColumns)
        {
            TraceFunctionCall();
            return Err(NativeMethods.JetRetrieveColumns(sesid.Value, tableid.Value, retrievecolumns, checked((uint)numColumns)));
        }

        /// <summary>
        /// Efficiently retrieves a set of columns and their values from the
        /// current record of a cursor or the copy buffer of that cursor. The
        /// columns and values retrieved can be restricted by a list of
        /// column IDs, itagSequence numbers, and other characteristics. This
        /// column retrieval API is unique in that it returns information in
        /// dynamically allocated memory that is obtained using a
        /// user-provided realloc compatible callback. This new flexibility
        /// permits the efficient retrieval of column data with specific
        /// characteristics (such as size and multiplicity) that are unknown
        /// to the caller. This eliminates the need for the use of the discovery
        /// modes of JetRetrieveColumn to determine those
        /// characteristics in order to setup a final call to
        /// JetRetrieveColumn that will successfully retrieve
        /// the desired data.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The cursor to retrieve data from.</param>
        /// <param name="numColumnids">The numbers of JET_ENUMCOLUMNIDS.</param>
        /// <param name="columnids">
        /// An optional array of column IDs, each with an optional array of itagSequence
        /// numbers to enumerate.
        /// </param>
        /// <param name="numColumnValues">
        /// Returns the number of column values retrieved.
        /// </param>
        /// <param name="columnValues">
        /// Returns the enumerated column values.
        /// </param>
        /// <param name="allocator">
        /// Callback used to allocate memory.
        /// </param>
        /// <param name="allocatorContext">
        /// Context for the allocation callback.
        /// </param>
        /// <param name="maxDataSize">
        /// Sets a cap on the amount of data to return from a long text or long
        /// binary column. This parameter can be used to prevent the enumeration
        /// of an extremely large column value.
        /// </param>
        /// <param name="grbit">Retrieve options.</param>
        /// <returns>A warning, error or success.</returns>
        public int JetEnumerateColumns(
            JET_SESID sesid,
            JET_TABLEID tableid,
            int numColumnids,
            JET_ENUMCOLUMNID[] columnids,
            out int numColumnValues,
            out JET_ENUMCOLUMN[] columnValues,
            JET_PFNREALLOC allocator,
            IntPtr allocatorContext,
            int maxDataSize,
            EnumerateColumnsGrbit grbit)
        {
            TraceFunctionCall();
            CheckNotNull(allocator, "allocator");
            CheckNotNegative(maxDataSize, "maxDataSize");
            CheckDataSize(columnids, numColumnids, "numColumnids");

            unsafe
            {
                // Converting to the native structs is a bit complex because we
                // do not want to allocate heap memory for this operations. We
                // allocate the NATIVE_ENUMCOLUMNID array on the stack and
                // convert the managed objects. During the conversion pass we
                // calculate the total size of the tags. An array for the tags
                // is then allocated and a second pass converts the tags.
                //
                // Because we are using stackalloc all the work has to be done
                // in the same method.
                NATIVE_ENUMCOLUMNID* nativecolumnids = stackalloc NATIVE_ENUMCOLUMNID[numColumnids];
                int totalNumTags = ConvertEnumColumnids(columnids, numColumnids, nativecolumnids);

                uint* tags = stackalloc uint[totalNumTags];
                ConvertEnumColumnidTags(columnids, numColumnids, nativecolumnids, tags);

                uint numEnumColumn;
                NATIVE_ENUMCOLUMN* nativeenumcolumns;
                int err = NativeMethods.JetEnumerateColumns(
                    sesid.Value,
                    tableid.Value,
                    checked((uint)numColumnids),
                    numColumnids > 0 ? nativecolumnids : null,
                    out numEnumColumn,
                    out nativeenumcolumns,
                    allocator,
                    allocatorContext,
                    checked((uint)maxDataSize),
                    (uint)grbit);

                ConvertEnumerateColumnsResult(allocator, allocatorContext, numEnumColumn, nativeenumcolumns, out numColumnValues, out columnValues);

                return Err(err);
            }
        }

        /// <summary>
        /// Efficiently retrieves a set of columns and their values from the
        /// current record of a cursor or the copy buffer of that cursor.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The cursor to retrieve data from.</param>
        /// <param name="grbit">Enumerate options.</param>
        /// <param name="enumeratedColumns">The discovered columns and their values.</param>
        /// <returns>A warning or success.</returns>
        public int JetEnumerateColumns(
            JET_SESID sesid,
            JET_TABLEID tableid,
            EnumerateColumnsGrbit grbit,
            out IEnumerable<EnumeratedColumn> enumeratedColumns)
        {
            unsafe
            {
                // NOTE:  We must never throw an exception up through ESE or it will corrupt its internal state!
                Exception allocatorException = null;
                JET_PFNREALLOC allocator = (c, pv, cb) =>
                {
                    try
                    {
                        if (pv == IntPtr.Zero)
                        {
                            // NOTE:  this will allocate memory if cb == 0 and that is what we want.
                            return Marshal.AllocHGlobal(new IntPtr(cb));
                        }

                        if (cb == 0)
                        {
                            Marshal.FreeHGlobal(pv);
                            return IntPtr.Zero;
                        }

                        return Marshal.ReAllocHGlobal(pv, new IntPtr(cb));
                    }
                    catch (OutOfMemoryException)
                    {
                        return IntPtr.Zero;
                    }
#if !MANAGEDESENT_ON_WSA // Thread model has changed in windows store apps.
                    catch (ThreadAbortException e)
                    {
                        LibraryHelpers.ThreadResetAbort();
                        allocatorException = e;
                        return IntPtr.Zero;
                    }
#endif
                    catch (Exception e)
                    {
                        allocatorException = e;
                        return IntPtr.Zero;
                    }
                };

                uint nativeEnumColumnCount;
                NATIVE_ENUMCOLUMN* nativeEnumColumns;
                int err = Implementation.NativeMethods.JetEnumerateColumns(
                    sesid.Value,
                    tableid.Value,
                    0,
                    null,
                    out nativeEnumColumnCount,
                    out nativeEnumColumns,
                    allocator,
                    IntPtr.Zero,
                    int.MaxValue,
                    (uint)(grbit & ~EnumerateColumnsGrbit.EnumerateCompressOutput));

                var columns = new EnumeratedColumn[nativeEnumColumnCount];
                for (int i = 0; i < nativeEnumColumnCount; ++i)
                {
                    columns[i] = new EnumeratedColumn();
                    columns[i].Id = new JET_COLUMNID { Value = nativeEnumColumns[i].columnid };
                    columns[i].Error = nativeEnumColumns[i].err < 0 ? (JET_err)nativeEnumColumns[i].err : JET_err.Success;
                    columns[i].Warning = nativeEnumColumns[i].err > 0 ? (JET_wrn)nativeEnumColumns[i].err : JET_wrn.Success;
                    if ((JET_wrn)nativeEnumColumns[i].err == JET_wrn.Success)
                    {
                        EnumeratedColumn.Value[] values = new EnumeratedColumn.Value[nativeEnumColumns[i].cEnumColumnValue];
                        columns[i].Values = values;
                        for (int j = 0; j < nativeEnumColumns[i].cEnumColumnValue; j++)
                        {
                            values[j] = new EnumeratedColumn.Value();
                            values[j].Ordinal = j + 1;
                            values[j].Warning = (JET_wrn)nativeEnumColumns[i].rgEnumColumnValue[j].err;
                            values[j].Bytes = new byte[(int)nativeEnumColumns[i].rgEnumColumnValue[j].cbData];
                            Marshal.Copy(
                                nativeEnumColumns[i].rgEnumColumnValue[j].pvData,
                                values[j].Bytes,
                                0,
                                (int)nativeEnumColumns[i].rgEnumColumnValue[j].cbData);
                            if (nativeEnumColumns[i].rgEnumColumnValue[j].pvData != IntPtr.Zero)
                            {
                                allocator(IntPtr.Zero, nativeEnumColumns[i].rgEnumColumnValue[j].pvData, 0);
                            }
                        }

                        if (nativeEnumColumns[i].rgEnumColumnValue != null)
                        {
                            allocator(IntPtr.Zero, new IntPtr(nativeEnumColumns[i].rgEnumColumnValue), 0);
                        }
                    }
                }

                if (nativeEnumColumns != null)
                {
                    allocator(IntPtr.Zero, new IntPtr(nativeEnumColumns), 0);
                }

                if (allocatorException != null)
                {
#if !MANAGEDESENT_ON_WSA // Thread model has changed in Windows store apps.
                    if (allocatorException is ThreadAbortException)
                    {
                        Thread.CurrentThread.Abort();
                    }
#endif
                    throw allocatorException;
                }

                enumeratedColumns = columns;
                return Err(err);
            }
        }

#if !MANAGEDESENT_ON_WSA // Not exposed in MSDK
        /// <summary>
        /// Retrieves record size information from the desired location.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">
        /// The cursor that will be used for the API call. The cursor must be
        /// positioned on a record, or have an update prepared.
        /// </param>
        /// <param name="recsize">Returns the size of the record.</param>
        /// <param name="grbit">Call options.</param>
        /// <returns>A warning, error or success.</returns>
        public int JetGetRecordSize(JET_SESID sesid, JET_TABLEID tableid, ref JET_RECSIZE recsize, GetRecordSizeGrbit grbit)
        {
            TraceFunctionCall();
            this.CheckSupportsVistaFeatures("JetGetRecordSize");
            int err;

            // Use JetGetRecordSize2 if available, otherwise JetGetRecordSize.
            if (this.Capabilities.SupportsWindows7Features)
            {
                var native = recsize.GetNativeRecsize2();
                err = NativeMethods.JetGetRecordSize2(sesid.Value, tableid.Value, ref native, (uint)grbit);
                recsize.SetFromNativeRecsize(native);
            }
            else
            {
                var native = recsize.GetNativeRecsize();
                err = NativeMethods.JetGetRecordSize(sesid.Value, tableid.Value, ref native, (uint)grbit);
                recsize.SetFromNativeRecsize(native);
            }

            return Err(err);
        }
#endif // !MANAGEDESENT_ON_WSA

        #endregion

        #region DML

        /// <summary>
        /// Deletes the current record in a database table.
        /// </summary>
        /// <param name="sesid">The session that opened the cursor.</param>
        /// <param name="tableid">The cursor on a database table. The current row will be deleted.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetDelete(JET_SESID sesid, JET_TABLEID tableid)
        {
            TraceFunctionCall();
            return Err(NativeMethods.JetDelete(sesid.Value, tableid.Value));
        }

        /// <summary>
        /// Prepare a cursor for update.
        /// </summary>
        /// <param name="sesid">The session which is starting the update.</param>
        /// <param name="tableid">The cursor to start the update for.</param>
        /// <param name="prep">The type of update to prepare.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetPrepareUpdate(JET_SESID sesid, JET_TABLEID tableid, JET_prep prep)
        {
            TraceFunctionCall();
            return Err(NativeMethods.JetPrepareUpdate(sesid.Value, tableid.Value, unchecked((uint)prep)));
        }

        /// <summary>
        /// The JetUpdate function performs an update operation including inserting a new row into
        /// a table or updating an existing row. Deleting a table row is performed by calling
        /// <see cref="IJetApi.JetDelete"/>.
        /// </summary>
        /// <param name="sesid">The session which started the update.</param>
        /// <param name="tableid">The cursor to update. An update should be prepared.</param>
        /// <param name="bookmark">Returns the bookmark of the updated record. This can be null.</param>
        /// <param name="bookmarkSize">The size of the bookmark buffer.</param>
        /// <param name="actualBookmarkSize">Returns the actual size of the bookmark.</param>
        /// <remarks>
        /// JetUpdate is the final step in performing an insert or an update. The update is begun by
        /// calling <see cref="IJetApi.JetPrepareUpdate"/> and then by calling
        /// JetSetColumn
        /// one or more times to set the record state. Finally, JetUpdate
        /// is called to complete the update operation. Indexes are updated only by JetUpdate or and not during JetSetColumn.
        /// </remarks>
        /// <returns>An error if the call fails.</returns>
        public int JetUpdate(JET_SESID sesid, JET_TABLEID tableid, byte[] bookmark, int bookmarkSize, out int actualBookmarkSize)
        {
            TraceFunctionCall();
#if MANAGEDESENT_ON_WSA
            return this.JetUpdate2(sesid, tableid, bookmark, bookmarkSize, out actualBookmarkSize, UpdateGrbit.None);
#else
            CheckDataSize(bookmark, bookmarkSize, "bookmarkSize");

            uint bytesActual;
            int err = Err(NativeMethods.JetUpdate(sesid.Value, tableid.Value, bookmark, checked((uint)bookmarkSize), out bytesActual));
            actualBookmarkSize = GetActualSize(bytesActual);

            return err;
#endif
        }

        /// <summary>
        /// The JetUpdate2 function performs an update operation including inserting a new row into
        /// a table or updating an existing row. Deleting a table row is performed by calling
        /// <see cref="JetDelete"/>.
        /// </summary>
        /// <param name="sesid">The session which started the update.</param>
        /// <param name="tableid">The cursor to update. An update should be prepared.</param>
        /// <param name="bookmark">Returns the bookmark of the updated record. This can be null.</param>
        /// <param name="bookmarkSize">The size of the bookmark buffer.</param>
        /// <param name="actualBookmarkSize">Returns the actual size of the bookmark.</param>
        /// <param name="grbit">Update options.</param>
        /// <remarks>
        /// JetUpdate is the final step in performing an insert or an update. The update is begun by
        /// calling <see cref="JetPrepareUpdate"/> and then by calling
        /// JetSetColumn one or more times to set the record state. Finally, JetUpdate
        /// is called to complete the update operation. Indexes are updated only by JetUpdate or and not during JetSetColumn.
        /// </remarks>
        /// <returns>An error if the call fails.</returns>
        public int JetUpdate2(JET_SESID sesid, JET_TABLEID tableid, byte[] bookmark, int bookmarkSize, out int actualBookmarkSize, UpdateGrbit grbit)
        {
            TraceFunctionCall();
            CheckDataSize(bookmark, bookmarkSize, "bookmarkSize");
            this.CheckSupportsServer2003Features("JetUpdate2");

            uint bytesActual;
            int err = Err(NativeMethods.JetUpdate2(sesid.Value, tableid.Value, bookmark, checked((uint)bookmarkSize), out bytesActual, (uint)grbit));
            actualBookmarkSize = GetActualSize(bytesActual);

            return err;
        }

        /// <summary>
        /// The JetSetColumn function modifies a single column value in a modified record to be inserted or to
        /// update the current record. It can overwrite an existing value, add a new value to a sequence of
        /// values in a multi-valued column, remove a value from a sequence of values in a multi-valued column,
        /// or update all or part of a long value (a column of type <see cref="JET_coltyp.LongText"/>
        /// or <see cref="JET_coltyp.LongBinary"/>).
        /// </summary>
        /// <remarks>
        /// The SetColumn methods provide datatype-specific overrides which may be more efficient.
        /// </remarks>
        /// <param name="sesid">The session which is performing the update.</param>
        /// <param name="tableid">The cursor to update. An update should be prepared.</param>
        /// <param name="columnid">The columnid to set.</param>
        /// <param name="data">The data to set.</param>
        /// <param name="dataSize">The size of data to set.</param>
        /// <param name="grbit">SetColumn options.</param>
        /// <param name="setinfo">Used to specify itag or long-value offset.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetSetColumn(JET_SESID sesid, JET_TABLEID tableid, JET_COLUMNID columnid, IntPtr data, int dataSize, SetColumnGrbit grbit, JET_SETINFO setinfo)
        {
            TraceFunctionCall();
            CheckNotNegative(dataSize, "dataSize");
            if (IntPtr.Zero == data)
            {
                if (dataSize > 0 && (SetColumnGrbit.SizeLV != (grbit & SetColumnGrbit.SizeLV)))
                {
                    throw new ArgumentOutOfRangeException(
                        "dataSize",
                        dataSize,
                        "cannot be greater than the length of the data (unless the SizeLV option is used)");
                }
            }

            if (null != setinfo)
            {
                NATIVE_SETINFO nativeSetinfo = setinfo.GetNativeSetinfo();
                return Err(NativeMethods.JetSetColumn(sesid.Value, tableid.Value, columnid.Value, data, checked((uint)dataSize), unchecked((uint)grbit), ref nativeSetinfo));
            }

            return Err(NativeMethods.JetSetColumn(sesid.Value, tableid.Value, columnid.Value, data, checked((uint)dataSize), unchecked((uint)grbit), IntPtr.Zero));
        }

        /// <summary>
        /// Allows an application to set multiple column values in a single
        /// operation. An array of <see cref="NATIVE_SETCOLUMN"/> structures is
        /// used to describe the set of column values to be set, and to describe
        /// input buffers for each column value to be set.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The cursor to set the columns on.</param>
        /// <param name="setcolumns">
        /// An array of <see cref="NATIVE_SETCOLUMN"/> structures describing the
        /// data to set.
        /// </param>
        /// <param name="numColumns">
        /// Number of entries in the setcolumns parameter.
        /// </param>
        /// <returns>An error code or warning.</returns>
        public unsafe int JetSetColumns(JET_SESID sesid, JET_TABLEID tableid, NATIVE_SETCOLUMN* setcolumns, int numColumns)
        {
            TraceFunctionCall();
            return Err(NativeMethods.JetSetColumns(sesid.Value, tableid.Value, setcolumns, checked((uint)numColumns)));
        }

#if !MANAGEDESENT_ON_WSA // Not exposed in MSDK
        /// <summary>
        /// Explicitly reserve the ability to update a row, write lock, or to explicitly prevent a row from
        /// being updated by any other session, read lock. Normally, row write locks are acquired implicitly as a
        /// result of updating rows. Read locks are usually not required because of record versioning. However,
        /// in some cases a transaction may desire to explicitly lock a row to enforce serialization, or to ensure
        /// that a subsequent operation will succeed.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The cursor to use. A lock will be acquired on the current record.</param>
        /// <param name="grbit">Lock options, use this to specify which type of lock to obtain.</param>
        /// <returns>An error if the call fails.</returns>
        public int JetGetLock(JET_SESID sesid, JET_TABLEID tableid, GetLockGrbit grbit)
        {
            TraceFunctionCall();
            return Err(NativeMethods.JetGetLock(sesid.Value, tableid.Value, unchecked((uint)grbit)));
        }
#endif // !MANAGEDESENT_ON_WSA

        /// <summary>
        /// Performs an atomic addition operation on one column. This function allows
        /// multiple sessions to update the same record concurrently without conflicts.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The cursor to update.</param>
        /// <param name="columnid">
        /// The column to update. This must be an escrow updatable column.
        /// </param>
        /// <param name="delta">The buffer containing the addend.</param>
        /// <param name="deltaSize">The size of the addend.</param>
        /// <param name="previousValue">
        /// An output buffer that will recieve the current value of the column. This buffer
        /// can be null.
        /// </param>
        /// <param name="previousValueLength">The size of the previousValue buffer.</param>
        /// <param name="actualPreviousValueLength">Returns the actual size of the previousValue.</param>
        /// <param name="grbit">Escrow update options.</param>
        /// <returns>An error code if the operation fails.</returns>
        public int JetEscrowUpdate(
            JET_SESID sesid,
            JET_TABLEID tableid,
            JET_COLUMNID columnid,
            byte[] delta,
            int deltaSize,
            byte[] previousValue,
            int previousValueLength,
            out int actualPreviousValueLength,
            EscrowUpdateGrbit grbit)
        {
            TraceFunctionCall();
            CheckNotNull(delta, "delta");
            CheckDataSize(delta, deltaSize, "deltaSize");
            CheckDataSize(previousValue, previousValueLength, "previousValueLength");

            uint bytesOldActual = 0;
            int err = Err(NativeMethods.JetEscrowUpdate(
                                  sesid.Value,
                                  tableid.Value,
                                  columnid.Value,
                                  delta,
                                  checked((uint)deltaSize),
                                  previousValue,
                                  checked((uint)previousValueLength),
                                  out bytesOldActual,
                                  unchecked((uint)grbit)));
            actualPreviousValueLength = checked((int)bytesOldActual);
            return err;
        }

        #endregion

        #region Callbacks

        /// <summary>
        /// Allows the application to configure the database engine to issue
        /// notifications to the application for specific events. These
        /// notifications are associated with a specific table and remain in
        /// effect only until the instance containing the table is shut down
        /// using <see cref="JetTerm"/>.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">
        /// A cursor opened on the table that the callback should be
        /// registered on.
        /// </param>
        /// <param name="cbtyp">
        /// The callback reasons for which the application wishes to receive notifications.
        /// </param>
        /// <param name="callback">The callback function.</param>
        /// <param name="context">A context that will be given to the callback.</param>
        /// <param name="callbackId">
        /// A handle that can later be used to cancel the registration of the given
        /// callback function using <see cref="JetUnregisterCallback"/>.
        /// </param>
        /// <returns>An error if the call fails.</returns>
        public int JetRegisterCallback(
            JET_SESID sesid,
            JET_TABLEID tableid,
            JET_cbtyp cbtyp,
            JET_CALLBACK callback,
            IntPtr context,
            out JET_HANDLE callbackId)
        {
            TraceFunctionCall();
            CheckNotNull(callback, "callback");

            callbackId = JET_HANDLE.Nil;
            return Err(NativeMethods.JetRegisterCallback(
                sesid.Value,
                tableid.Value,
                unchecked((uint)cbtyp),
                this.callbackWrappers.Add(callback).NativeCallback,
                context,
                out callbackId.Value));
        }

        /// <summary>
        /// Configures the database engine to stop issuing notifications to the
        /// application as previously requested through
        /// <see cref="JetRegisterCallback"/>.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">
        /// A cursor opened on the table that the callback should be
        /// registered on.
        /// </param>
        /// <param name="cbtyp">
        /// The callback reasons for which the application no longer wishes to receive notifications.
        /// </param>
        /// <param name="callbackId">
        /// The handle of the registered callback that was returned by <see cref="JetRegisterCallback"/>.
        /// </param>
        /// <returns>An error if the call fails.</returns>
        public int JetUnregisterCallback(JET_SESID sesid, JET_TABLEID tableid, JET_cbtyp cbtyp, JET_HANDLE callbackId)
        {
            TraceFunctionCall();
            this.callbackWrappers.Collect();
            return Err(NativeMethods.JetUnregisterCallback(
                sesid.Value,
                tableid.Value,
                unchecked((uint)cbtyp),
                callbackId.Value));
        }

        #endregion

        #region Online Maintenance

        /// <summary>
        /// Starts and stops database defragmentation tasks that improves data
        /// organization within a database.
        /// </summary>
        /// <param name="sesid">The session to use for the call.</param>
        /// <param name="dbid">The database to be defragmented.</param>
        /// <param name="tableName">
        /// Under some options defragmentation is performed for the entire database described by the given 
        /// database ID, and other options (such as <see cref="Windows7Grbits.DefragmentBTree"/>) require
        /// the name of the table to defragment.
        /// </param>
        /// <param name="passes">
        /// When starting an online defragmentation task, this parameter sets the maximum number of defragmentation
        /// passes. When stopping an online defragmentation task, this parameter is set to the number of passes
        /// performed. This is not honored in all modes (such as <see cref="Windows7Grbits.DefragmentBTree"/>).
        /// </param>
        /// <param name="seconds">
        /// When starting an online defragmentation task, this parameter sets
        /// the maximum time for defragmentation. When stopping an online
        /// defragmentation task, this output buffer is set to the length of
        /// time used for defragmentation. This is not honored in all modes (such as <see cref="Windows7Grbits.DefragmentBTree"/>).
        /// </param>
        /// <param name="grbit">Defragmentation options.</param>
        /// <returns>An error code.</returns>
        /// <seealso cref="JetApi.Defragment"/>.
        /// <seealso cref="JetApi.JetDefragment2"/>.
        public int JetDefragment(JET_SESID sesid, JET_DBID dbid, string tableName, ref int passes, ref int seconds, DefragGrbit grbit)
        {
#if MANAGEDESENT_ON_WSA
            return this.JetDefragment2(sesid, dbid, tableName, ref passes, ref seconds, null, grbit);
#else
            TraceFunctionCall();
            uint nativePasses = unchecked((uint)passes);
            uint nativeSeconds = unchecked((uint)seconds);
            int err = Err(NativeMethods.JetDefragment(
                sesid.Value, dbid.Value, tableName, ref nativePasses, ref nativeSeconds, (uint)grbit));
            passes = unchecked((int)nativePasses);
            seconds = unchecked((int)nativeSeconds);
            return err;
#endif
        }

        /// <summary>
        /// Starts and stops database defragmentation tasks that improves data
        /// organization within a database.
        /// </summary>
        /// <param name="sesid">The session to use for the call.</param>
        /// <param name="dbid">The database to be defragmented.</param>
        /// <param name="tableName">
        /// Under some options defragmentation is performed for the entire database described by the given 
        /// database ID, and other options (such as <see cref="Windows7Grbits.DefragmentBTree"/>) require
        /// the name of the table to defragment.
        /// </param>
        /// <param name="grbit">Defragmentation options.</param>
        /// <returns>An error code.</returns>
        /// <seealso cref="JetApi.JetDefragment"/>.
        public int Defragment(
            JET_SESID sesid,
            JET_DBID dbid,
            string tableName,
            DefragGrbit grbit)
        {
#if MANAGEDESENT_ON_WSA
            return this.Defragment2(sesid, dbid, tableName, null, grbit);
#else
            TraceFunctionCall();
            int err = Err(NativeMethods.JetDefragment(
                sesid.Value, dbid.Value, tableName, IntPtr.Zero, IntPtr.Zero, (uint)grbit));
            return err;
#endif
        }

        /// <summary>
        /// Starts and stops database defragmentation tasks that improves data
        /// organization within a database.
        /// </summary>
        /// <param name="sesid">The session to use for the call.</param>
        /// <param name="dbid">The database to be defragmented.</param>
        /// <param name="tableName">
        /// Under some options defragmentation is performed for the entire database described by the given 
        /// database ID, and other options (such as <see cref="Windows7Grbits.DefragmentBTree"/>) require
        /// the name of the table to defragment.
        /// </param>
        /// <param name="passes">
        /// When starting an online defragmentation task, this parameter sets the maximum number of defragmentation
        /// passes. When stopping an online defragmentation task, this parameter is set to the number of passes
        /// performed. This is not honored in all modes (such as <see cref="Windows7Grbits.DefragmentBTree"/>).
        /// </param>
        /// <param name="seconds">
        /// When starting an online defragmentation task, this parameter sets
        /// the maximum time for defragmentation. When stopping an online
        /// defragmentation task, this output buffer is set to the length of
        /// time used for defragmentation. This is not honored in all modes (such as <see cref="Windows7Grbits.DefragmentBTree"/>).
        /// </param>
        /// <param name="callback">Callback function that defrag uses to report progress.</param>
        /// <param name="grbit">Defragmentation options.</param>
        /// <returns>An error code or warning.</returns>
        /// <seealso cref="JetApi.JetDefragment"/>.
        public int JetDefragment2(
            JET_SESID sesid,
            JET_DBID dbid,
            string tableName,
            ref int passes,
            ref int seconds,
            JET_CALLBACK callback,
            DefragGrbit grbit)
        {
            TraceFunctionCall();
            uint nativePasses = unchecked((uint)passes);
            uint nativeSeconds = unchecked((uint)seconds);

            IntPtr functionPointer;
            if (null == callback)
            {
                functionPointer = IntPtr.Zero;
            }
            else
            {
                JetCallbackWrapper callbackWrapper = this.callbackWrappers.Add(callback);
                functionPointer = Marshal.GetFunctionPointerForDelegate(callbackWrapper.NativeCallback);
#if DEBUG
                GC.Collect();
#endif
            }

#if MANAGEDESENT_ON_WSA
            int err = Err(NativeMethods.JetDefragment2W(
                sesid.Value, dbid.Value, tableName, ref nativePasses, ref nativeSeconds, functionPointer, (uint)grbit));
#else
            int err = Err(NativeMethods.JetDefragment2(
                sesid.Value, dbid.Value, tableName, ref nativePasses, ref nativeSeconds, functionPointer, (uint)grbit));
#endif
            passes = unchecked((int)nativePasses);
            seconds = unchecked((int)nativeSeconds);
            this.callbackWrappers.Collect();
            return err;
        }

        //// Currently, this overload of JetDefragment2() is not used outside of WSA.
#if MANAGEDESENT_ON_WSA
        /// <summary>
        /// Starts and stops database defragmentation tasks that improves data
        /// organization within a database.
        /// </summary>
        /// <param name="sesid">The session to use for the call.</param>
        /// <param name="dbid">The database to be defragmented.</param>
        /// <param name="tableName">
        /// Under some options defragmentation is performed for the entire database described by the given 
        /// database ID, and other options (such as <see cref="Windows7Grbits.DefragmentBTree"/>) require
        /// the name of the table to defragment.
        /// </param>
        /// <param name="callback">Callback function that defrag uses to report progress.</param>
        /// <param name="grbit">Defragmentation options.</param>
        /// <returns>An error code or warning.</returns>
        /// <seealso cref="JetApi.JetDefragment2"/>.
        public int Defragment2(
            JET_SESID sesid,
            JET_DBID dbid,
            string tableName,
            JET_CALLBACK callback,
            DefragGrbit grbit)
        {
            TraceFunctionCall();

            IntPtr functionPointer;
            if (null == callback)
            {
                functionPointer = IntPtr.Zero;
            }
            else
            {
                JetCallbackWrapper callbackWrapper = this.callbackWrappers.Add(callback);
                functionPointer = Marshal.GetFunctionPointerForDelegate(callbackWrapper.NativeCallback);
#if DEBUG
                GC.Collect();
#endif
            }

#if MANAGEDESENT_ON_WSA
            int err = Err(NativeMethods.JetDefragment2W(
                sesid.Value, dbid.Value, tableName, IntPtr.Zero, IntPtr.Zero, functionPointer, (uint)grbit));
#else
            int err = Err(NativeMethods.JetDefragment2(
                sesid.Value, dbid.Value, tableName, IntPtr.Zero, IntPtr.Zero, functionPointer, (uint)grbit));
#endif
            this.callbackWrappers.Collect();
            return err;
        }
#endif

#if !MANAGEDESENT_ON_WSA // Not exposed in MSDK
        /// <summary>
        /// Performs idle cleanup tasks or checks the version store status in ESE.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="grbit">A combination of JetIdleGrbit flags.</param>
        /// <returns>An error code if the operation fails.</returns>
        public int JetIdle(JET_SESID sesid, IdleGrbit grbit)
        {
            TraceFunctionCall();
            return Err(NativeMethods.JetIdle(sesid.Value, (uint)grbit));
        }
#endif // !MANAGEDESENT_ON_WSA

        #endregion

        #region Misc

#if !MANAGEDESENT_ON_WSA // Not exposed in MSDK
        /// <summary>
        /// Crash dump options for Watson.
        /// </summary>
        /// <param name="grbit">Crash dump options.</param>
        /// <returns>An error code.</returns>
        public int JetConfigureProcessForCrashDump(CrashDumpGrbit grbit)
        {
            TraceFunctionCall();
            this.CheckSupportsWindows7Features("JetConfigureProcessForCrashDump");
            return Err(NativeMethods.JetConfigureProcessForCrashDump((uint)grbit));
        }

        /// <summary>
        /// Frees memory that was allocated by a database engine call.
        /// </summary>
        /// <param name="buffer">
        /// The buffer allocated by a call to the database engine.
        /// <see cref="IntPtr.Zero"/> is acceptable, and will be ignored.
        /// </param>
        /// <returns>An error code.</returns>
        public int JetFreeBuffer(IntPtr buffer)
        {
            TraceFunctionCall();
            return Err(NativeMethods.JetFreeBuffer(buffer));
        }
#endif // !MANAGEDESENT_ON_WSA

        #endregion

        #region Internal Helper Methods

        /// <summary>
        /// Given the size returned by ESENT, get the size
        /// to return to the user.
        /// </summary>
        /// <param name="numBytesActual">The size returned by ESENT.</param>
        /// <returns>The bookmark size to return to the user.</returns>
        internal static int GetActualSize(uint numBytesActual)
        {
            // BUG: debug builds of ESENT can fill numBytesActual with this value in case of failure.
            const uint CbActualDebugFill = 0xDDDDDDDD;
            int actualSize;
            if (CbActualDebugFill == numBytesActual)
            {
                actualSize = 0;
            }
            else
            {
                actualSize = checked((int)numBytesActual);
            }

            return actualSize;
        }

        #endregion Internal Helper Methods

        #region Parameter Checking and Tracing

        /// <summary>
        /// Make sure the data, dataOffset and dataSize arguments match.
        /// </summary>
        /// <param name="data">The data buffer.</param>
        /// <param name="dataOffset">The offset into the data.</param>
        /// <param name="offsetArgumentName">The name of the offset argument.</param>
        /// <param name="dataSize">The size of the data.</param>
        /// <param name="sizeArgumentName">The name of the size argument.</param>
        /// <typeparam name="T">The type of the data.</typeparam>
        private static void CheckDataSize<T>(ICollection<T> data, int dataOffset, string offsetArgumentName, int dataSize, string sizeArgumentName)
        {
            CheckNotNegative(dataSize, sizeArgumentName);
            CheckNotNegative(dataOffset, offsetArgumentName);

            if ((null == data && 0 != dataOffset) || (null != data && dataOffset > data.Count))
            {
                Trace.WriteLineIf(TraceSwitch.TraceError, "CheckDataSize failed");
                throw new ArgumentOutOfRangeException(
                    offsetArgumentName,
                    dataOffset,
                    "cannot be greater than the length of the buffer");
            }

            if ((null == data && 0 != dataSize) || (null != data && dataSize > data.Count - dataOffset))
            {
                Trace.WriteLineIf(TraceSwitch.TraceError, "CheckDataSize failed");
                throw new ArgumentOutOfRangeException(
                    sizeArgumentName,
                    dataSize,
                    "cannot be greater than the length of the buffer");
            }
        }

        /// <summary>
        /// Make sure the data and dataSize arguments match.
        /// </summary>
        /// <param name="data">The data buffer.</param>
        /// <param name="dataSize">The size of the data.</param>
        /// <param name="argumentName">The name of the size argument.</param>
        /// <typeparam name="T">The type of the data.</typeparam>
        private static void CheckDataSize<T>(ICollection<T> data, int dataSize, string argumentName)
        {
            CheckDataSize(data, 0, string.Empty, dataSize, argumentName);
        }

        /// <summary>
        /// Make sure the given object isn't null. If it is
        /// then throw an ArgumentNullException.
        /// </summary>
        /// <param name="o">The object to check.</param>
        /// <param name="paramName">The name of the parameter.</param>
        private static void CheckNotNull(object o, string paramName)
        {
            if (null == o)
            {
                Trace.WriteLineIf(TraceSwitch.TraceError, "CheckNotNull failed");
                throw new ArgumentNullException(paramName);
            }
        }

        /// <summary>
        /// Make sure the given integer isn't negative. If it is
        /// then throw an ArgumentOutOfRangeException.
        /// </summary>
        /// <param name="i">The integer to check.</param>
        /// <param name="paramName">The name of the parameter.</param>
        private static void CheckNotNegative(long i, string paramName)
        {
            if (i < 0)
            {
                Trace.WriteLineIf(TraceSwitch.TraceError, "CheckNotNegative failed");
                throw new ArgumentOutOfRangeException(paramName, i, "cannot be negative");
            }
        }

        /// <summary>
        /// Used when an unsupported API method is called. This
        /// logs an error and returns an InvalidOperationException.
        /// </summary>
        /// <param name="method">The name of the method.</param>
        /// <returns>The exception to throw.</returns>
        private static Exception UnsupportedApiException(string method)
        {
            string error = string.Format(CultureInfo.InvariantCulture, "Method {0} is not supported by this version of ESENT", method);
            Trace.WriteLineIf(TraceSwitch.TraceError, error);
            return new InvalidOperationException(error);
        }

        /// <summary>
        /// Trace a call to an ESENT function.
        /// </summary>
        /// <param name="function">The name of the function being called.</param>
        [Conditional("TRACE")]
#if DEBUG
        // Disallow inlining so we can always get the name of the calling function.
        [MethodImpl(MethodImplOptions.NoInlining)]
#endif
        private static void TraceFunctionCall([System.Runtime.CompilerServices.CallerMemberName] string function = null)
        {
            Trace.WriteLineIf(TraceSwitch.TraceInfo, function);
        }

        /// <summary>
        /// Can be used to trap ESENT errors.
        /// </summary>
        /// <param name="err">The error being returned.</param>
        /// <returns>The error.</returns>
        private static int Err(int err)
        {
            TraceErr(err);
            return err;
        }

        /// <summary>
        /// Trace an error generated by a call to ESENT.
        /// </summary>
        /// <param name="err">The error to trace.</param>
        [Conditional("TRACE")]
        private static void TraceErr(int err)
        {
            if (0 == err)
            {
                Trace.WriteLineIf(TraceSwitch.TraceVerbose, "JET_err.Success");
            }
            else if (err > 0)
            {
                Trace.WriteLineIf(TraceSwitch.TraceWarning, unchecked((JET_wrn)err));
            }
            else
            {
                Trace.WriteLineIf(TraceSwitch.TraceError, unchecked((JET_err)err));
            }
        }

        #endregion Parameter Checking and Tracing

        #region Helper Methods

        /// <summary>
        /// Convert managed JET_ENUMCOLUMNID objects to NATIVE_ENUMCOLUMNID
        /// structures.
        /// </summary>
        /// <param name="columnids">The columnids to convert.</param>
        /// <param name="numColumnids">The number of columnids to convert.</param>
        /// <param name="nativecolumnids">The array to store the converted columnids.</param>
        /// <returns>The total number of tag entries in the converted structures.</returns>
        private static unsafe int ConvertEnumColumnids(IList<JET_ENUMCOLUMNID> columnids, int numColumnids, NATIVE_ENUMCOLUMNID* nativecolumnids)
        {
            int totalNumTags = 0;
            for (int i = 0; i < numColumnids; ++i)
            {
                nativecolumnids[i] = columnids[i].GetNativeEnumColumnid();
                checked
                {
                    totalNumTags += columnids[i].ctagSequence;
                }
            }

            return totalNumTags;
        }

        /// <summary>
        /// Convert managed rgtagSequence to unmanaged rgtagSequence.
        /// </summary>
        /// <param name="columnids">The columnids to convert.</param>
        /// <param name="numColumnids">The number of columnids to covert.</param>
        /// <param name="nativecolumnids">The unmanaged columnids to add the tags to.</param>
        /// <param name="tags">
        /// Memory to use for converted rgtagSequence. This should be large enough to
        /// hold all columnids.
        /// </param>
        private static unsafe void ConvertEnumColumnidTags(IList<JET_ENUMCOLUMNID> columnids, int numColumnids, NATIVE_ENUMCOLUMNID* nativecolumnids, uint* tags)
        {
            for (int i = 0; i < numColumnids; ++i)
            {
                nativecolumnids[i].rgtagSequence = tags;
                for (int j = 0; j < columnids[i].ctagSequence; ++j)
                {
                    nativecolumnids[i].rgtagSequence[j] = checked((uint)columnids[i].rgtagSequence[j]);
                }

                tags += columnids[i].ctagSequence;
            }
        }

        /// <summary>
        /// Convert the native (unmanaged) results of JetEnumerateColumns to
        /// managed objects. This uses the allocator callback to free some
        /// memory as the data is converted.
        /// </summary>
        /// <param name="allocator">The allocator callback used.</param>
        /// <param name="allocatorContext">The allocator callback context.</param>
        /// <param name="numEnumColumn">Number of NATIVE_ENUMCOLUMN structures returned.</param>
        /// <param name="nativeenumcolumns">NATIVE_ENUMCOLUMN structures.</param>
        /// <param name="numColumnValues">Returns the number of converted JET_ENUMCOLUMN objects.</param>
        /// <param name="columnValues">Returns the convertd column values.</param>
        private static unsafe void ConvertEnumerateColumnsResult(JET_PFNREALLOC allocator, IntPtr allocatorContext, uint numEnumColumn, NATIVE_ENUMCOLUMN* nativeenumcolumns, out int numColumnValues, out JET_ENUMCOLUMN[] columnValues)
        {
            numColumnValues = checked((int)numEnumColumn);
            columnValues = new JET_ENUMCOLUMN[numColumnValues];
            for (int i = 0; i < numColumnValues; ++i)
            {
                columnValues[i] = new JET_ENUMCOLUMN();
                columnValues[i].SetFromNativeEnumColumn(nativeenumcolumns[i]);
                if (JET_wrn.ColumnSingleValue != columnValues[i].err)
                {
                    columnValues[i].rgEnumColumnValue = new JET_ENUMCOLUMNVALUE[columnValues[i].cEnumColumnValue];
                    for (int j = 0; j < columnValues[i].cEnumColumnValue; ++j)
                    {
                        columnValues[i].rgEnumColumnValue[j] = new JET_ENUMCOLUMNVALUE();
                        columnValues[i].rgEnumColumnValue[j].SetFromNativeEnumColumnValue(nativeenumcolumns[i].rgEnumColumnValue[j]);
                    }

                    // the NATIVE_ENUMCOLUMNVALUES have been converted
                    // free their memory
                    allocator(allocatorContext, new IntPtr(nativeenumcolumns[i].rgEnumColumnValue), 0);
                    nativeenumcolumns[i].rgEnumColumnValue = null;
                }
            }

            // Now we have converted all the NATIVE_ENUMCOLUMNS we can
            // free the memory they use
            allocator(allocatorContext, new IntPtr(nativeenumcolumns), 0);
            nativeenumcolumns = null;
        }

        /// <summary>
        /// Make an array of native columndefs from JET_COLUMNDEFs.
        /// </summary>
        /// <param name="columns">Columndefs to convert.</param>
        /// <param name="numColumns">Number of columndefs to convert.</param>
        /// <returns>An array of native columndefs.</returns>
        private static NATIVE_COLUMNDEF[] GetNativecolumndefs(IList<JET_COLUMNDEF> columns, int numColumns)
        {
            var nativecolumndefs = new NATIVE_COLUMNDEF[numColumns];
            for (int i = 0; i < numColumns; ++i)
            {
                nativecolumndefs[i] = columns[i].GetNativeColumndef();
            }

            return nativecolumndefs;
        }

        /// <summary>
        /// Make native conditionalcolumn structures from the managed ones.
        /// </summary>
        /// <param name="conditionalColumns">The conditional columns to convert.</param>
        /// <param name="useUnicodeData">Wehether to convert the strings with UTF-16.</param>
        /// <param name="handles">The handle collection used to pin the data.</param>
        /// <returns>Pinned native versions of the conditional columns.</returns>
        private static IntPtr GetNativeConditionalColumns(
            IList<JET_CONDITIONALCOLUMN> conditionalColumns,
            bool useUnicodeData,
            ref GCHandleCollection handles)
        {
            if (null == conditionalColumns)
            {
                return IntPtr.Zero;
            }

            var nativeConditionalcolumns = new NATIVE_CONDITIONALCOLUMN[conditionalColumns.Count];
            for (int i = 0; i < conditionalColumns.Count; ++i)
            {
                nativeConditionalcolumns[i] = conditionalColumns[i].GetNativeConditionalColumn();
                if (useUnicodeData)
                {
                    nativeConditionalcolumns[i].szColumnName = handles.Add(Util.ConvertToNullTerminatedUnicodeByteArray(conditionalColumns[i].szColumnName));
                }
                else
                {
                    nativeConditionalcolumns[i].szColumnName = handles.Add(Util.ConvertToNullTerminatedAsciiByteArray(conditionalColumns[i].szColumnName));
                }
            }

            return handles.Add(nativeConditionalcolumns);
        }

        /// <summary>
        /// Make native columncreate structures from the managed ones.
        /// </summary>
        /// <param name="managedColumnCreates">Column create structures to convert.</param>
        /// <param name="useUnicodeData">Wehether to convert the strings with UTF-16.</param>
        /// <param name="handles">The handle collection used to pin the data.</param>
        /// <returns>Pinned native versions of the column creates.</returns>
        private static IntPtr GetNativeColumnCreates(
            IList<JET_COLUMNCREATE> managedColumnCreates,
            bool useUnicodeData,
            ref GCHandleCollection handles)
        {
            IntPtr nativeBuffer = IntPtr.Zero;

            if (managedColumnCreates != null && managedColumnCreates.Count > 0)
            {
                var nativeColumns = new NATIVE_COLUMNCREATE[managedColumnCreates.Count];

                for (int i = 0; i < managedColumnCreates.Count; ++i)
                {
                    if (managedColumnCreates[i] != null)
                    {
                        JET_COLUMNCREATE managedColumn = managedColumnCreates[i];
                        nativeColumns[i] = managedColumn.GetNativeColumnCreate();

                        if (useUnicodeData)
                        {
                            nativeColumns[i].szColumnName = handles.Add(Util.ConvertToNullTerminatedUnicodeByteArray(managedColumn.szColumnName));
                        }
                        else
                        {
                            nativeColumns[i].szColumnName = handles.Add(Util.ConvertToNullTerminatedAsciiByteArray(managedColumn.szColumnName));
                        }

                        if (managedColumn.cbDefault > 0)
                        {
                            nativeColumns[i].pvDefault = handles.Add(managedColumn.pvDefault);
                        }
                    }
                }

                nativeBuffer = handles.Add(nativeColumns);
            }

            return nativeBuffer;
        }

#if !MANAGEDESENT_ON_WSA // Not exposed in MSDK
        /// <summary>
        /// Make native indexcreate structures from the managed ones.
        /// Only supports Ascii data, since it could be used on XP.
        /// </summary>
        /// <param name="managedIndexCreates">Index create structures to convert.</param>
        /// <param name="handles">The handle collection used to pin the data.</param>
        /// <returns>Pinned native versions of the index creates.</returns>
        private static unsafe JET_INDEXCREATE.NATIVE_INDEXCREATE[] GetNativeIndexCreates(
            IList<JET_INDEXCREATE> managedIndexCreates,
            ref GCHandleCollection handles)
        {
            JET_INDEXCREATE.NATIVE_INDEXCREATE[] nativeIndices = null;

            if (managedIndexCreates != null && managedIndexCreates.Count > 0)
            {
                nativeIndices = new JET_INDEXCREATE.NATIVE_INDEXCREATE[managedIndexCreates.Count];

                for (int i = 0; i < managedIndexCreates.Count; ++i)
                {
                    nativeIndices[i] = managedIndexCreates[i].GetNativeIndexcreate();

                    if (null != managedIndexCreates[i].pidxUnicode)
                    {
                        NATIVE_UNICODEINDEX unicode = managedIndexCreates[i].pidxUnicode.GetNativeUnicodeIndex();
                        nativeIndices[i].pidxUnicode = (NATIVE_UNICODEINDEX*)handles.Add(unicode);
                        nativeIndices[i].grbit |= (uint)VistaGrbits.IndexUnicode;
                    }

                    nativeIndices[i].szKey = handles.Add(Util.ConvertToNullTerminatedAsciiByteArray(managedIndexCreates[i].szKey));
                    nativeIndices[i].szIndexName = handles.Add(Util.ConvertToNullTerminatedAsciiByteArray(managedIndexCreates[i].szIndexName));
                    nativeIndices[i].rgconditionalcolumn = GetNativeConditionalColumns(managedIndexCreates[i].rgconditionalcolumn, false, ref handles);
                }
            }

            return nativeIndices;
        }

        /// <summary>
        /// Make native indexcreate structures from the managed ones.
        /// Only supports Unicode data, since it was introduced in Vista.
        /// </summary>
        /// <param name="managedIndexCreates">Index create structures to convert.</param>
        /// <param name="handles">The handle collection used to pin the data.</param>
        /// <returns>Pinned native versions of the index creates.</returns>
        private static unsafe JET_INDEXCREATE.NATIVE_INDEXCREATE1[] GetNativeIndexCreate1s(
            IList<JET_INDEXCREATE> managedIndexCreates,
            ref GCHandleCollection handles)
        {
            JET_INDEXCREATE.NATIVE_INDEXCREATE1[] nativeIndices = null;

            if (managedIndexCreates != null && managedIndexCreates.Count > 0)
            {
                nativeIndices = new JET_INDEXCREATE.NATIVE_INDEXCREATE1[managedIndexCreates.Count];

                for (int i = 0; i < managedIndexCreates.Count; ++i)
                {
                    nativeIndices[i] = managedIndexCreates[i].GetNativeIndexcreate1();

                    if (null != managedIndexCreates[i].pidxUnicode)
                    {
                        NATIVE_UNICODEINDEX unicode = managedIndexCreates[i].pidxUnicode.GetNativeUnicodeIndex();
                        nativeIndices[i].indexcreate.pidxUnicode = (NATIVE_UNICODEINDEX*)handles.Add(unicode);
                        nativeIndices[i].indexcreate.grbit |= (uint)VistaGrbits.IndexUnicode;
                    }

                    nativeIndices[i].indexcreate.szKey = handles.Add(Util.ConvertToNullTerminatedUnicodeByteArray(managedIndexCreates[i].szKey));
                    nativeIndices[i].indexcreate.cbKey *= sizeof(char);
                    nativeIndices[i].indexcreate.szIndexName = handles.Add(Util.ConvertToNullTerminatedUnicodeByteArray(managedIndexCreates[i].szIndexName));
                    nativeIndices[i].indexcreate.rgconditionalcolumn = GetNativeConditionalColumns(managedIndexCreates[i].rgconditionalcolumn, false, ref handles);
                }
            }

            return nativeIndices;
        }

        /// <summary>
        /// Make native indexcreate structures from the managed ones.
        /// Only supports Unicode data, since it was introduced in Win7.
        /// </summary>
        /// <param name="managedIndexCreates">Index create structures to convert.</param>
        /// <param name="handles">The handle collection used to pin the data.</param>
        /// <returns>Pinned native versions of the index creates.</returns>
        private static unsafe JET_INDEXCREATE.NATIVE_INDEXCREATE2[] GetNativeIndexCreate2s(
            IList<JET_INDEXCREATE> managedIndexCreates,
            ref GCHandleCollection handles)
        {
            JET_INDEXCREATE.NATIVE_INDEXCREATE2[] nativeIndices = null;

            if (managedIndexCreates != null && managedIndexCreates.Count > 0)
            {
                nativeIndices = new JET_INDEXCREATE.NATIVE_INDEXCREATE2[managedIndexCreates.Count];

                for (int i = 0; i < managedIndexCreates.Count; ++i)
                {
                    nativeIndices[i] = managedIndexCreates[i].GetNativeIndexcreate2();

                    if (null != managedIndexCreates[i].pidxUnicode)
                    {
                        NATIVE_UNICODEINDEX unicode = managedIndexCreates[i].pidxUnicode.GetNativeUnicodeIndex();
                        nativeIndices[i].indexcreate1.indexcreate.pidxUnicode = (NATIVE_UNICODEINDEX*)handles.Add(unicode);
                        nativeIndices[i].indexcreate1.indexcreate.grbit |= (uint)VistaGrbits.IndexUnicode;
                    }

                    nativeIndices[i].indexcreate1.indexcreate.szKey = handles.Add(Util.ConvertToNullTerminatedUnicodeByteArray(managedIndexCreates[i].szKey));
                    nativeIndices[i].indexcreate1.indexcreate.cbKey *= sizeof(char);
                    nativeIndices[i].indexcreate1.indexcreate.szIndexName = handles.Add(Util.ConvertToNullTerminatedUnicodeByteArray(managedIndexCreates[i].szIndexName));
                    nativeIndices[i].indexcreate1.indexcreate.rgconditionalcolumn = GetNativeConditionalColumns(managedIndexCreates[i].rgconditionalcolumn, true, ref handles);

                    // Convert pSpaceHints.
                    if (managedIndexCreates[i].pSpaceHints != null)
                    {
                        NATIVE_SPACEHINTS nativeSpaceHints = managedIndexCreates[i].pSpaceHints.GetNativeSpaceHints();

                        nativeIndices[i].pSpaceHints = handles.Add(nativeSpaceHints);
                    }
                }
            }

            return nativeIndices;
        }
#endif // !MANAGEDESENT_ON_WSA

        /// <summary>
        /// Set managed columnids from unmanaged columnids. This also sets the columnids
        /// in the columndefs.
        /// </summary>
        /// <param name="columns">The column definitions.</param>
        /// <param name="columnids">The columnids to set.</param>
        /// <param name="nativecolumnids">The native columnids.</param>
        /// <param name="numColumns">The number of columnids to set.</param>
        private static void SetColumnids(IList<JET_COLUMNDEF> columns, IList<JET_COLUMNID> columnids, IList<uint> nativecolumnids, int numColumns)
        {
            for (int i = 0; i < numColumns; ++i)
            {
                columnids[i] = new JET_COLUMNID { Value = nativecolumnids[i] };
                columns[i].columnid = columnids[i];
            }
        }

#if !MANAGEDESENT_ON_WSA // Not exposed in MSDK
        /// <summary>
        /// Creates indexes over data in an ESE database.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The table to create the index on.</param>
        /// <param name="indexcreates">Array of objects describing the indexes to be created.</param>
        /// <param name="numIndexCreates">Number of index description objects.</param>
        /// <returns>An error code.</returns>
        private static int CreateIndexes(JET_SESID sesid, JET_TABLEID tableid, IList<JET_INDEXCREATE> indexcreates, int numIndexCreates)
        {
            // pin the memory
            var handles = new GCHandleCollection();
            try
            {
                JET_INDEXCREATE.NATIVE_INDEXCREATE[] nativeIndexcreates = GetNativeIndexCreates(indexcreates, ref handles);
                return Err(NativeMethods.JetCreateIndex2(sesid.Value, tableid.Value, nativeIndexcreates, checked((uint)numIndexCreates)));
            }
            finally
            {
                handles.Dispose();
            }
        }

        /// <summary>
        /// Creates indexes over data in an ESE database.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The table to create the index on.</param>
        /// <param name="indexcreates">Array of objects describing the indexes to be created.</param>
        /// <param name="numIndexCreates">Number of index description objects.</param>
        /// <returns>An error code.</returns>
        private static int CreateIndexes1(JET_SESID sesid, JET_TABLEID tableid, IList<JET_INDEXCREATE> indexcreates, int numIndexCreates)
        {
            // pin the memory
            var handles = new GCHandleCollection();
            try
            {
                JET_INDEXCREATE.NATIVE_INDEXCREATE1[] nativeIndexcreates = GetNativeIndexCreate1s(indexcreates, ref handles);
                return Err(NativeMethods.JetCreateIndex2W(sesid.Value, tableid.Value, nativeIndexcreates, checked((uint)numIndexCreates)));
            }
            finally
            {
                handles.Dispose();
            }
        }

        /// <summary>
        /// Creates indexes over data in an ESE database.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The table to create the index on.</param>
        /// <param name="indexcreates">Array of objects describing the indexes to be created.</param>
        /// <param name="numIndexCreates">Number of index description objects.</param>
        /// <returns>An error code.</returns>
        private static int CreateIndexes2(JET_SESID sesid, JET_TABLEID tableid, IList<JET_INDEXCREATE> indexcreates, int numIndexCreates)
        {
            // pin the memory
            var handles = new GCHandleCollection();
            try
            {
                JET_INDEXCREATE.NATIVE_INDEXCREATE2[] nativeIndexcreates = GetNativeIndexCreate2s(indexcreates, ref handles);
                return Err(NativeMethods.JetCreateIndex3W(sesid.Value, tableid.Value, nativeIndexcreates, checked((uint)numIndexCreates)));
            }
            finally
            {
                handles.Dispose();
            }
        }

        /// <summary>
        /// Creates a table, adds columns, and indices on that table.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="dbid">The database to which to add the new table.</param>
        /// <param name="tablecreate">Object describing the table to create.</param>
        /// <returns>An error if the call fails.</returns>
        private static int CreateTableColumnIndex3(
            JET_SESID sesid,
            JET_DBID dbid,
            JET_TABLECREATE tablecreate)
        {
            JET_TABLECREATE.NATIVE_TABLECREATE3 nativeTableCreate = tablecreate.GetNativeTableCreate3();

            unsafe
            {
                var handles = new GCHandleCollection();
                try
                {
                    // Convert/pin the column definitions.
                    nativeTableCreate.rgcolumncreate = (NATIVE_COLUMNCREATE*)GetNativeColumnCreates(tablecreate.rgcolumncreate, true, ref handles);

                    // Convert/pin the index definitions.
                    JET_INDEXCREATE.NATIVE_INDEXCREATE2[] nativeIndexCreates = GetNativeIndexCreate2s(tablecreate.rgindexcreate, ref handles);
                    nativeTableCreate.rgindexcreate = handles.Add(nativeIndexCreates);

                    // Convert/pin the space hints.
                    if (tablecreate.pSeqSpacehints != null)
                    {
                        NATIVE_SPACEHINTS nativeSpaceHints = tablecreate.pSeqSpacehints.GetNativeSpaceHints();
                        nativeTableCreate.pSeqSpacehints = (NATIVE_SPACEHINTS*)handles.Add(nativeSpaceHints);
                    }

                    if (tablecreate.pLVSpacehints != null)
                    {
                        NATIVE_SPACEHINTS nativeSpaceHints = tablecreate.pLVSpacehints.GetNativeSpaceHints();
                        nativeTableCreate.pLVSpacehints = (NATIVE_SPACEHINTS*)handles.Add(nativeSpaceHints);
                    }

                    int err = NativeMethods.JetCreateTableColumnIndex3W(sesid.Value, dbid.Value, ref nativeTableCreate);

                    // Modified fields.
                    tablecreate.tableid = new JET_TABLEID
                    {
                        Value = nativeTableCreate.tableid
                    };

                    tablecreate.cCreated = checked((int)nativeTableCreate.cCreated);

                    if (tablecreate.rgcolumncreate != null)
                    {
                        for (int i = 0; i < tablecreate.rgcolumncreate.Length; ++i)
                        {
                            tablecreate.rgcolumncreate[i].SetFromNativeColumnCreate(ref nativeTableCreate.rgcolumncreate[i]);
                        }
                    }

                    if (tablecreate.rgindexcreate != null)
                    {
                        for (int i = 0; i < tablecreate.rgindexcreate.Length; ++i)
                        {
                            tablecreate.rgindexcreate[i].SetFromNativeIndexCreate(nativeIndexCreates[i]);
                        }
                    }

                    return Err(err);
                }
                finally
                {
                    handles.Dispose();
                }
            }
        }

        /// <summary>
        /// Convert native instance info structures to managed, treating the
        /// unmanaged strings as Unicode.
        /// </summary>
        /// <param name="nativeNumInstance">The number of native structures.</param>
        /// <param name="nativeInstanceInfos">
        /// A pointer to the native structures. This pointer will be freed with JetFreeBuffer.
        /// </param>
        /// <returns>
        /// An array of JET_INSTANCE_INFO structures created from the unmanaged.
        /// </returns>
        private unsafe JET_INSTANCE_INFO[] ConvertInstanceInfosUnicode(uint nativeNumInstance, NATIVE_INSTANCE_INFO* nativeInstanceInfos)
        {
            int numInstances = checked((int)nativeNumInstance);
            var instances = new JET_INSTANCE_INFO[numInstances];
            for (int i = 0; i < numInstances; ++i)
            {
                instances[i] = new JET_INSTANCE_INFO();
                instances[i].SetFromNativeUnicode(nativeInstanceInfos[i]);
            }

            this.JetFreeBuffer(new IntPtr(nativeInstanceInfos));

            return instances;
        }

        /// <summary>
        /// Convert native instance info structures to managed, treating the
        /// unmanaged string as Unicode.
        /// </summary>
        /// <param name="nativeNumInstance">The number of native structures.</param>
        /// <param name="nativeInstanceInfos">
        /// A pointer to the native structures. This pointer will be freed with JetFreeBuffer.
        /// </param>
        /// <returns>
        /// An array of JET_INSTANCE_INFO structures created from the unmanaged.
        /// </returns>
        private unsafe JET_INSTANCE_INFO[] ConvertInstanceInfosAscii(uint nativeNumInstance, NATIVE_INSTANCE_INFO* nativeInstanceInfos)
        {
            int numInstances = checked((int)nativeNumInstance);
            var instances = new JET_INSTANCE_INFO[numInstances];
            for (int i = 0; i < numInstances; ++i)
            {
                instances[i] = new JET_INSTANCE_INFO();
                instances[i].SetFromNativeAscii(nativeInstanceInfos[i]);
            }

            this.JetFreeBuffer(new IntPtr(nativeInstanceInfos));

            return instances;
        }
#endif // !MANAGEDESENT_ON_WSA

        #endregion

        #region Capability Checking

        /// <summary>
        /// Check that ESENT supports Server 2003 features. Throws an exception if Server 2003 features
        /// aren't supported.
        /// </summary>
        /// <param name="api">The API that is being called.</param>
        private void CheckSupportsServer2003Features(string api)
        {
            if (!this.Capabilities.SupportsServer2003Features)
            {
                throw UnsupportedApiException(api);
            }
        }

        /// <summary>
        /// Check that ESENT supports Vista features. Throws an exception if Vista features
        /// aren't supported.
        /// </summary>
        /// <param name="api">The API that is being called.</param>
        private void CheckSupportsVistaFeatures(string api)
        {
            if (!this.Capabilities.SupportsVistaFeatures)
            {
                throw UnsupportedApiException(api);
            }
        }

        /// <summary>
        /// Check that ESENT supports Windows7 features. Throws an exception if Windows7 features
        /// aren't supported.
        /// </summary>
        /// <param name="api">The API that is being called.</param>
        private void CheckSupportsWindows7Features(string api)
        {
            if (!this.Capabilities.SupportsWindows7Features)
            {
                throw UnsupportedApiException(api);
            }
        }

        /// <summary>
        /// Check that ESENT supports Windows8 features. Throws an exception if Windows8 features
        /// aren't supported.
        /// </summary>
        /// <param name="api">The API that is being called.</param>
        private void CheckSupportsWindows8Features(string api)
        {
            if (!this.Capabilities.SupportsWindows8Features)
            {
                throw UnsupportedApiException(api);
            }
        }

        /// <summary>
        /// Check that ESENT supports Windows10 features. Throws an exception if Windows10 features
        /// aren't supported.
        /// </summary>
        /// <param name="api">The API that is being called.</param>
        private void CheckSupportsWindows10Features(string api)
        {
            if (!this.Capabilities.SupportsWindows10Features)
            {
                throw UnsupportedApiException(api);
            }
        }

        #endregion

        #region Non-static Helper Methods

        // This overload takes an IntPtr rather than a JET_INDEXID. It's meant to only be called by
        // our JetSetCurrentIndex1-3, to 'up-cast' to JetSetCurrentIndex4().
#if MANAGEDESENT_ON_WSA
        /// <summary>
        /// Set the current index of a cursor.
        /// This overload takes an IntPtr rather than a JET_INDEXID. It's meant to only be called by
        /// our JetSetCurrentIndex1-3, to 'up-cast' to JetSetCurrentIndex4().
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="tableid">The cursor to set the index on.</param>
        /// <param name="index">
        /// The name of the index to be selected. If this is null or empty the primary
        /// index will be selected.
        /// </param>
        /// <param name="indexid">
        /// Reserved. Must be IntPtr.Zero.
        /// </param>
        /// <param name="grbit">
        /// Set index options.
        /// </param>
        /// <param name="itagSequence">
        /// Sequence number of the multi-valued column value which will be used
        /// to position the cursor on the new index. This parameter is only used
        /// in conjunction with <see cref="SetCurrentIndexGrbit.NoMove"/>. When
        /// this parameter is not present or is set to zero, its value is presumed
        /// to be 1.
        /// </param>
        /// <returns>An error if the call fails.</returns>
        private int JetSetCurrentIndex4(
            JET_SESID sesid,
            JET_TABLEID tableid,
            string index,
            IntPtr indexid,
            SetCurrentIndexGrbit grbit,
            int itagSequence)
        {
            TraceFunctionCall();

            if (indexid != IntPtr.Zero)
            {
                // If you have a valid indexid, you should be using the other overload!
                throw new ArgumentException("indexid must be IntPtr.Zero.", "indexid");
            }

            // A null index name is valid here -- it will set the table to the primary index
            return Err(NativeMethods.JetSetCurrentIndex4W(sesid.Value, tableid.Value, index, indexid, (uint)grbit, checked((uint)itagSequence)));
        }
#endif // MANAGEDESENT_ON_WSA

#if !MANAGEDESENT_ON_WSA // Not exposed in MSDK
        /// <summary>
        /// Creates a table, adds columns, and indices on that table.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="dbid">The database to which to add the new table.</param>
        /// <param name="tablecreate">Object describing the table to create.</param>
        /// <returns>An error if the call fails.</returns>
        private int CreateTableColumnIndex2(
            JET_SESID sesid,
            JET_DBID dbid,
            JET_TABLECREATE tablecreate)
        {
            JET_TABLECREATE.NATIVE_TABLECREATE2 nativeTableCreate = tablecreate.GetNativeTableCreate2();

            unsafe
            {
                var handles = new GCHandleCollection();
                try
                {
                    JET_INDEXCREATE.NATIVE_INDEXCREATE1[] nativeIndexCreate1s = null;
                    JET_INDEXCREATE.NATIVE_INDEXCREATE[] nativeIndexCreates = null;
                    int err;

                    if (this.Capabilities.SupportsVistaFeatures)
                    {
                        // Convert/pin the column definitions.
                        nativeTableCreate.rgcolumncreate = (NATIVE_COLUMNCREATE*)GetNativeColumnCreates(tablecreate.rgcolumncreate, true, ref handles);

                        // Convert/pin the index definitions.
                        nativeIndexCreate1s = GetNativeIndexCreate1s(tablecreate.rgindexcreate, ref handles);
                        nativeTableCreate.rgindexcreate = handles.Add(nativeIndexCreate1s);
                        err = NativeMethods.JetCreateTableColumnIndex2W(sesid.Value, dbid.Value, ref nativeTableCreate);
                    }
                    else
                    {
                        // Convert/pin the column definitions.
                        nativeTableCreate.rgcolumncreate = (NATIVE_COLUMNCREATE*)GetNativeColumnCreates(tablecreate.rgcolumncreate, false, ref handles);

                        // Convert/pin the index definitions.
                        nativeIndexCreates = GetNativeIndexCreates(tablecreate.rgindexcreate, ref handles);
                        nativeTableCreate.rgindexcreate = handles.Add(nativeIndexCreates);
                        err = NativeMethods.JetCreateTableColumnIndex2(sesid.Value, dbid.Value, ref nativeTableCreate);
                    }

                    // Modified fields.
                    tablecreate.tableid = new JET_TABLEID
                        {
                            Value = nativeTableCreate.tableid
                        };

                    tablecreate.cCreated = checked((int)nativeTableCreate.cCreated);

                    if (tablecreate.rgcolumncreate != null)
                    {
                        for (int i = 0; i < tablecreate.rgcolumncreate.Length; ++i)
                        {
                            tablecreate.rgcolumncreate[i].SetFromNativeColumnCreate(ref nativeTableCreate.rgcolumncreate[i]);
                        }
                    }

                    if (tablecreate.rgindexcreate != null)
                    {
                        for (int i = 0; i < tablecreate.rgindexcreate.Length; ++i)
                        {
                            if (null != nativeIndexCreate1s)
                            {
                                tablecreate.rgindexcreate[i].SetFromNativeIndexCreate(nativeIndexCreate1s[i]);
                            }
                            else
                            {
                                tablecreate.rgindexcreate[i].SetFromNativeIndexCreate(nativeIndexCreates[i]);
                            }
                        }
                    }

                    return Err(err);
                }
                finally
                {
                    handles.Dispose();
                }
            }
        }
#endif // !MANAGEDESENT_ON_WSA

        #endregion

        #region Hooks for not-yet-published APIs.
        /// <summary>
        /// Provides a hook to allow population of additional fields in
        /// a different file. These additonal fields are not yet published
        /// on MSDN.
        /// </summary>
        /// <param name="databaseName">The name of the database about which to retrieve information.</param>
        /// <param name="dbinfomisc">The output structure to populate.</param>
        /// <param name="infoLevel">Specifies which information to retrieve.</param>
        /// <param name="notYetPublishedSupported">Whether the additional fields specified by in <paramref name="infoLevel"/>
        /// are populated.</param>
        /// <param name="err">The <see cref="JET_err"/> error code returned.</param>
        partial void NotYetPublishedGetDbinfomisc(
            string databaseName,
            ref JET_DBINFOMISC dbinfomisc,
            JET_DbInfo infoLevel,
            ref bool notYetPublishedSupported,
            ref int err);

        /// <summary>
        /// Provides a hook to allow population of additional fields in
        /// a different file. These additonal fields are not yet published
        /// on MSDN.
        /// </summary>
        /// <param name="sesid">The session to use.</param>
        /// <param name="dbid">The database identifier.</param>
        /// <param name="dbinfomisc">The output structure to populate.</param>
        /// <param name="infoLevel">Specifies which information to retrieve.</param>
        /// <param name="notYetPublishedSupported">Whether the additional fields specified by in <paramref name="infoLevel"/>
        /// are populated.</param>
        /// <param name="err">The <see cref="JET_err"/> error code returned.</param>
        partial void NotYetPublishedGetDbinfomisc(
            JET_SESID sesid,
            JET_DBID dbid,
            ref JET_DBINFOMISC dbinfomisc,
            JET_DbInfo infoLevel,
            ref bool notYetPublishedSupported,
            ref int err);

        #endregion
    }
}