diff --git a/helper/database.mysql.old.php b/helper/database.mysql.old.php
new file mode 100644
index 0000000..ad5c161
--- /dev/null
+++ b/helper/database.mysql.old.php
@@ -0,0 +1,52 @@
+<?php
+/**
+ * @file database.mysql.old.php
+ * @date 2018-09-14
+ * @author Go Namhyeon <gnh1201@gmail.com>
+ * @brief MySQL-old (lower than 5.4) database helper
+ */
+
+if(!function_exists("get_db_mysql_old_connect")) {
+	function get_db_mysql_old_connect() {
+		$conn = false;
+		$config = get_config();
+
+    $conn = mysql_connect($config['db_host'], $config['db_username'], $config['db_password']);
+    if(!$conn) {
+        set_error("Could not connect: " . @mysql_error());
+        show_errors();
+    }
+    
+    if(!@mysql_select_db('database_name', $conn)) {
+        set_error("Could not select database.");
+        show_errors();
+    }
+
+		return $conn;
+	}
+}
+
+if(!function_exists("exec_db_mysql_old_query")) {
+	function exec_db_mysql_old_query($sql, $bind) {
+		$result = false;
+		$dbc = get_dbc_object();
+
+		$binded_sql = get_db_binded_sql($sql, $bind);
+		$result = @mysql_query($dbc, $binded_sql);
+
+		return $result;
+	}
+}
+
+if(!function_exists("exec_db_mysql_old_fetch_all")) {
+	function exec_db_mysql_imp_fetch_all($sql, $bind) {
+		$rows = array();
+		$result = exec_db_mysql_imp_query($sql, $bind);
+
+		while($row = @mysql_fetch_array($result)) {
+			$rows[] = $row;
+		}
+
+		return $rows;
+	}
+}