DB::queryOneRow PHP Method

    public static function queryOneRow()
    {
        $args = func_get_args();
        return call_user_func_array(array(DB::getMDB(), 'queryOneRow'), $args);
    }

 public function __construct($category_id, $item_id)
 {
     $data = DB::queryOneRow("SELECT * FROM category_items WHERE category_id=%d AND id=%d", $category_id, $item_id);
     foreach ($data as $k => $v) {
         $this->{$k} = $v;
     }
 }