/**
* Rolls back the current transaction.
*
* This is just a wrapper method to rollback whatever transaction stack we are
* currently in, which is managed by the connection object itself. Note that
* logging (preferable with watchdog_exception()) needs to happen after a
* transaction has been rolled back or the log messages will be rolled back
* too.
*
* @see kxDB::rollback()
* @see watchdog_exception()
*/
public function rollback()
{
$this->rolledBack = TRUE;
$this->connection->rollback($this->name);
}