diff --git a/phpBB/includes/db/driver/mssql_base.php b/phpBB/includes/db/driver/mssql_base.php
new file mode 100644
index 0000000000..56c111c871
--- /dev/null
+++ b/phpBB/includes/db/driver/mssql_base.php
@@ -0,0 +1,65 @@
+<?php
+/**
+*
+* @package dbal
+* @copyright (c) 2013 phpBB Group
+* @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License v2
+*
+*/
+
+/**
+* @ignore
+*/
+if (!defined('IN_PHPBB'))
+{
+	exit;
+}
+
+/**
+* MSSQL Database Base Abstraction Layer
+* @package dbal
+ */
+abstract class phpbb_db_driver_mssql_base extends phpbb_db_driver
+{
+	/**
+	* {@inheritDoc}
+	*/
+	public function sql_concatenate($expr1, $expr2)
+	{
+		return $expr1 . ' + ' . $expr2;
+	}
+
+	/**
+	* Escape string used in sql query
+	*/
+	function sql_escape($msg)
+	{
+		return str_replace(array("'", "\0"), array("''", ''), $msg);
+	}
+
+	/**
+	* {@inheritDoc}
+	*/
+	function sql_lower_text($column_name)
+	{
+		return "LOWER(SUBSTRING($column_name, 1, DATALENGTH($column_name)))";
+	}
+
+	/**
+	* Build LIKE expression
+	* @access private
+	*/
+	function _sql_like_expression($expression)
+	{
+		return $expression . " ESCAPE '\\'";
+	}
+
+	/**
+	* Build db-specific query data
+	* @access private
+	*/
+	function _sql_custom_build($stage, $data)
+	{
+		return $data;
+	}
+}
diff --git a/phpBB/includes/db/driver/mssql_odbc.php b/phpBB/includes/db/driver/mssql_odbc.php
index f7834443eb..cde9d332ba 100644
--- a/phpBB/includes/db/driver/mssql_odbc.php
+++ b/phpBB/includes/db/driver/mssql_odbc.php
@@ -26,7 +26,7 @@ if (!defined('IN_PHPBB'))
 *
 * @package dbal
 */
-class phpbb_db_driver_mssql_odbc extends phpbb_db_driver
+class phpbb_db_driver_mssql_odbc extends phpbb_db_driver_mssql_base
 {
 	var $last_query_text = '';
 	var $connect_error = '';
@@ -125,14 +125,6 @@ class phpbb_db_driver_mssql_odbc extends phpbb_db_driver
 		return ($this->sql_server_version) ? 'MSSQL (ODBC)<br />' . $this->sql_server_version : 'MSSQL (ODBC)';
 	}
 
-	/**
-	* {@inheritDoc}
-	*/
-	public function sql_concatenate($expr1, $expr2)
-	{
-		return $expr1 . ' + ' . $expr2;
-	}
-
 	/**
 	* SQL Transaction
 	* @access private
@@ -325,40 +317,6 @@ class phpbb_db_driver_mssql_odbc extends phpbb_db_driver
 		return false;
 	}
 
-	/**
-	* Escape string used in sql query
-	*/
-	function sql_escape($msg)
-	{
-		return str_replace(array("'", "\0"), array("''", ''), $msg);
-	}
-
-	/**
-	* {@inheritDoc}
-	*/
-	function sql_lower_text($column_name)
-	{
-		return "LOWER(SUBSTRING($column_name, 1, DATALENGTH($column_name)))";
-	}
-
-	/**
-	* Build LIKE expression
-	* @access private
-	*/
-	function _sql_like_expression($expression)
-	{
-		return $expression . " ESCAPE '\\'";
-	}
-
-	/**
-	* Build db-specific query data
-	* @access private
-	*/
-	function _sql_custom_build($stage, $data)
-	{
-		return $data;
-	}
-
 	/**
 	* return sql error array
 	* @access private
diff --git a/phpBB/includes/db/driver/mssqlnative.php b/phpBB/includes/db/driver/mssqlnative.php
index 656cbd2437..6f433e10cf 100644
--- a/phpBB/includes/db/driver/mssqlnative.php
+++ b/phpBB/includes/db/driver/mssqlnative.php
@@ -191,7 +191,7 @@ class result_mssqlnative
 /**
 * @package dbal
 */
-class phpbb_db_driver_mssqlnative extends phpbb_db_driver
+class phpbb_db_driver_mssqlnative extends phpbb_db_driver_mssql_base
 {
 	var $m_insert_id = NULL;
 	var $last_query_text = '';
@@ -256,14 +256,6 @@ class phpbb_db_driver_mssqlnative extends phpbb_db_driver
 		return ($this->sql_server_version) ? 'MSSQL<br />' . $this->sql_server_version : 'MSSQL';
 	}
 
-	/**
-	* {@inheritDoc}
-	*/
-	public function sql_concatenate($expr1, $expr2)
-	{
-		return $expr1 . ' + ' . $expr2;
-	}
-
 	/**
 	* {@inheritDoc}
 	*/
@@ -490,31 +482,6 @@ class phpbb_db_driver_mssqlnative extends phpbb_db_driver
 		return false;
 	}
 
-	/**
-	* Escape string used in sql query
-	*/
-	function sql_escape($msg)
-	{
-		return str_replace(array("'", "\0"), array("''", ''), $msg);
-	}
-
-	/**
-	* {@inheritDoc}
-	*/
-	function sql_lower_text($column_name)
-	{
-		return "LOWER(SUBSTRING($column_name, 1, DATALENGTH($column_name)))";
-	}
-
-	/**
-	* Build LIKE expression
-	* @access private
-	*/
-	function _sql_like_expression($expression)
-	{
-		return $expression . " ESCAPE '\\'";
-	}
-
 	/**
 	* return sql error array
 	* @access private
@@ -560,15 +527,6 @@ class phpbb_db_driver_mssqlnative extends phpbb_db_driver
 		return $error;
 	}
 
-	/**
-	* Build db-specific query data
-	* @access private
-	*/
-	function _sql_custom_build($stage, $data)
-	{
-		return $data;
-	}
-
 	/**
 	* Close sql connection
 	* @access private