WeDevs\ORM\Eloquent\Database::instance PHP 메소드

    public static function instance()
    {
        static $instance = false;
        if (!$instance) {
            $instance = new self();
        }
        return $instance;
    }

 public function __construct()
 {
     $this->_db = \WeDevs\ORM\Eloquent\Database::instance();
 }