用这框架用了一段时间了,但一直都只是用了view层和controller层,一直没有用过model层,有人知道这个model具体在实际开发中是干嘛的吗?
回复讨论(解决方案)
Model(模型)是应用程序中用于处理应用程序数据逻辑的部分。
通常模型对象负责在数据库中存取数据。
Model(模型)是应用程序中用于处理应用程序数据逻辑的部分。
通常模型对象负责在数据库中存取数据。
可我所有的数据库存取都在controller里完成了,比如下面controller里的代码,意思是要把下面的某些封到model里才正规?
public function goodsPage(){ $table_goods=M('goods'); $goods_id=I('param.id'); $info_where['id']=$goods_id; $goods_info=$table_goods->where($info_where)->field('id,name,price,type,img,detail_img1,detail_img2,detail_img3,number,supply')->select(); $this->assign('info',$goods_info); $this->display(); }
Model(模型)是应用程序中用于处理应用程序数据逻辑的部分。
通常模型对象负责在数据库中存取数据。
可我所有的数据库存取都在controller里完成了,比如下面controller里的代码,意思是要把下面的某些封到model里才正规?
public function goodsPage(){ $table_goods=M('goods'); $goods_id=I('param.id'); $info_where['id']=$goods_id; $goods_info=$table_goods->where($info_where)->field('id,name,price,type,img,detail_img1,detail_img2,detail_img3,number,supply')->select(); $this->assign('info',$goods_info); $this->display(); }对滴,标准的mvc是这样。
能说下具体是如何进行封装到model里的吗,比如我上面的那段代码,谢谢
首先 MVC 并无标准,他只是反映了大多数人对事物的认知
其次 M、V、C 间并无明确的分工,不需要过于拘泥 M 还是 C
按照 MVC 的一般解释,网站开发中,你的工作都应该在 M、V 中完成,C 几乎没事可做(尤其是多入口架构)
现代框架中,M 充当了数据库操作的角色。实际上是将部分业务逻辑在 C 中完成
试试下面这样写看行不
action 代码:
public function goodsPage(){ $goods=D('Goods'); $goods_info = $goods->foo(); $this->assign('info',$goods_info); $this->display(); }
在model文件夹下建立一个 GoodsModel.class.php 文件
代码如下:
<?phpclass GoodsModel extends Model{ public function foo(){ $table_goods=M('goods'); $goods_id=I('param.id'); $info_where['id']=$goods_id; $goods_info=$table_goods->where($info_where)->field('id,name,price,type,img,detail_img1,detail_img2,detail_img3,number,supply')->select(); return $goods_info; }}
假如你做一个 列表展示页 和一个 导出excel功能
不写模型 相同的select数据 你得在俩个function里写俩次
如果写了模型 俩个function中可以调用一个模型
可以省很多事 少写很多代码 也方便以后的修改
和html 共用一个top.html footer.html 是一个道理

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