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<?php
/**
* @link http://www.yiiframework.com/
* @copyright Copyright (c) 2008 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
namespace yii\db\mssql;
/**
* This is an extension of the default PDO class of MSSQL and DBLIB drivers.
* It provides workarounds for improperly implemented functionalities of the MSSQL and DBLIB drivers.
*
* @author Timur Ruziev <resurtm@gmail.com>
* @since 2.0
*/
class PDO extends \PDO
{
/**
* Returns value of the last inserted ID.
* @param string|null $sequence the sequence name. Defaults to null.
* @return integer last inserted ID value.
*/
public function lastInsertId($sequence = null)
{
return $this->query('SELECT CAST(COALESCE(SCOPE_IDENTITY(), @@IDENTITY) AS bigint)')->fetchColumn();
}
/**
* Starts a transaction. It is necessary to override PDO's method as MSSQL PDO driver does not
* natively support transactions.
* @return boolean the result of a transaction start.
*/
public function beginTransaction()
{
$this->exec('BEGIN TRANSACTION');
return true;
}
/**
* Commits a transaction. It is necessary to override PDO's method as MSSQL PDO driver does not
* natively support transactions.
* @return boolean the result of a transaction commit.
*/
public function commit()
{
$this->exec('COMMIT TRANSACTION');
return true;
}
/**
* Rollbacks a transaction. It is necessary to override PDO's method as MSSQL PDO driver does not
* natively support transactions.
* @return boolean the result of a transaction rollback.
*/
public function rollBack()
{
$this->exec('ROLLBACK TRANSACTION');
return true;
}
}