YY面试,对MVC框架M层的理解,求指导
根据我的理解,平时用来处理数据的方法,我把它封装成类,以后遇到同样的数据处理我就调用这个类,这个类属于M层,处理数据。
面试官问我:
我们抓取网页有这么几步
1.根据URL抓取网页
2.正则表达式处理html元素
3.将抓取到的内容存入数据库
以上这三部哪一步处于M层?
我觉得三步都属于啊。
求大家指导我的理解是否有错,错在哪里,拜托了~
如果上面三步哪一步不是M层,那它属于MVC的哪一层??
回复讨论(解决方案)
个人觉得第3部属于m层.
因为第3部进行了数据库的查询.
第一步是不是有可能属于C层?这个要看项目的定义了。
3必然是 12可算可不算吧 我理解
首先3是对数据库的直接操作,肯定是一个通用性非常强的底层接口
2也可以算M,针对XX网站做的处理,来源于该网站的html都可以调用
1照样可以是M,无非是在2的基础上增加了一个curl抓取,url作参数而已
我觉得1.2属于业务逻辑层,3是数据层
明显3,对数据的操作
1 是控制层 3是处理数据层 我是这么理解
只有3是,1,2是控制层
第三步,m是数据处理层,当然你应用逻辑也可以写在m层,只不过很不规范。
正确的mvc架构应该让c层尽可能少的处理数据逻辑,而让m来处理,否则mvc的最大优点--代码模块化的优势就体现不出来了。
仅供参考!
MVC架构根本就没有准确定义,面试官水平不够或者故弄玄虚吧。
V是用户视角
C是业务视角
M是功能视角
三者本来就是一起合作完成任何一个功能的。抓取网页的话,对资源的请求一般写在M里。
正则表达式分析HTML这个,C和M都说得过去。在M里写好方法,C里调用是个比较好的结构。
数据库操作肯定是M,因为很多框架里,M就剩下访问数据库了。

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