How to use transaction in Symfony with Doctrine

The following code explains for itself in using simple transaction with Doctrine 1.x ORM in Symfony.

$conn = sfContext::getInstance()->getDatabaseManager()->getDatabase('doctrine')->getDoctrineConnection();   try { 	$conn->beginTransaction();   	// The part where you want to do transaction. Add your codes here   	// Commit the transaction when done 	$conn->commit();   } catch (Doctrine_Exception $e) { 	// Rollback if transaction fail 	$conn->rollback(); }