public function connect($driverOptions= array (), array $options= array()) {
        $connected = false;
        $this->getConnection($options);
        if ($this->connection instanceof xPDOConnection) {
            $connected = $this->connection->connect($driverOptions);
            if ($connected) {
                $this->pdo =& $this->connection->pdo;
            }
        }
        return $connected;
    }