Doctrine\DBAL\Platforms\OraclePlatform::_getTransactionIsolationLevelSQL PHP Метод

    protected function _getTransactionIsolationLevelSQL($level)
    {
        switch ($level) {
            case \Doctrine\DBAL\Connection::TRANSACTION_READ_UNCOMMITTED:
                return 'READ UNCOMMITTED';
            case \Doctrine\DBAL\Connection::TRANSACTION_READ_COMMITTED:
                return 'READ COMMITTED';
            case \Doctrine\DBAL\Connection::TRANSACTION_REPEATABLE_READ:
            case \Doctrine\DBAL\Connection::TRANSACTION_SERIALIZABLE:
                return 'SERIALIZABLE';
            default:
                return parent::_getTransactionIsolationLevelSQL($level);
        }
    }