Model\Card::queryCardById PHP Method

    public static function queryCardById($id)
    {
        $st = DB::sql("SELECT * FROM card WHERE id=:id ");
        $st->bindValue(":id", $id, DB::PARAM_INT);
        $st->execute();
        return $st->fetchObject(__CLASS__);
    }

 /**
  * 删除卡号
  * @JSON
  */
 public function delete()
 {
     MCard::queryCardById(trim($_POST['id']))->delete();
     return array('error' => 0, 'message' => '删除成功');
 }