/**
* Creates the PDO instance.
*
* This method is called by {@see \rock\db\Connection::open()} to establish a DB connection.
* The default implementation will create a PHP PDO instance.
* You may override this method if the default PDO needs to be adapted for certain DBMS.
* @return PDO the pdo instance
*/
protected function createPdoInstance()
{
$pdoClass = $this->pdoClass;
if ($pdoClass === null) {
$pdoClass = 'PDO';
if ($this->_driverName !== null) {
$driver = $this->_driverName;
} elseif (($pos = strpos($this->dsn, ':')) !== false) {
$driver = strtolower(substr($this->dsn, 0, $pos));
}
if (isset($driver) && ($driver === 'mssql' || $driver === 'dblib' || $driver === 'sqlsrv')) {
$pdoClass = \rock\db\mssql\PDO::className();
}
}
return new $pdoClass($this->dsn, $this->username, $this->password, $this->attributes);
}
