public function __construct($dsn, $username = null, $password = null, $options = [])
{
parent::__construct();
$this->_dsn = $dsn;
$this->_username = $username;
$this->_password = $password;
$this->_options = $options;
}
public function __construct($connection_string, $connect_type = 0)
{
parent::__construct();
$this->_connectionString = $connection_string;
$this->_connectType = $connect_type;
}
public function __construct($params = array())
{
parent::__construct($params);
}