Zend_Db_Adapter_Pdo_Abstract::_beginTransaction PHP Method

    protected function _beginTransaction()
    {
        $this->_connect();
        $this->_connection->beginTransaction();
    }

 protected function _beginTransaction()
 {
     /**
      * Auto-Commit must be turned off before begin transaction
      */
     $this->getConnection()->setAttribute(PDO::ATTR_AUTOCOMMIT, 0);
     parent::_beginTransaction();
 }