protected function databaseInfo()
    {
        $pdo = $this->database->getConnection()->getPdo();

        $version = $this->ifExists($pdo->getAttribute(PDO::ATTR_SERVER_VERSION));

        $driver = $this->ifExists($pdo->getAttribute(PDO::ATTR_DRIVER_NAME));
        $driver = $this->ifExists((! empty($this->databases[$driver]) ? $this->databases[$driver] : null));

        $this->results['database'] = compact('driver', 'version');

        return $this;
    }