diff --git a/system/drivers/DB_mysql.php b/system/drivers/DB_mysql.php
index 69a6db0..208f09c 100644
--- a/system/drivers/DB_mysql.php
+++ b/system/drivers/DB_mysql.php
@@ -123,7 +123,7 @@
* @access public
* @return bool
*/
- function trans_begin()
+ function trans_begin($test_mode = FALSE)
{
if ( ! $this->trans_enabled)
{
@@ -136,6 +136,11 @@
return TRUE;
}
+ // Reset the transaction failure flag.
+ // If the $test_mode flag is set to TRUE transactions will be rolled back
+ // even if the queries produce a successful result.
+ $this->_trans_failure = ($test_mode === TRUE) ? TRUE : FALSE;
+
$this->simple_query('SET AUTOCOMMIT=0');
$this->simple_query('START TRANSACTION'); // can also be BEGIN or BEGIN WORK
return TRUE;