MVC模式中，M和C的作用到底有什么区别？
MVC模式中，M和C的作用到底有什么区别？比如建个学生信息管理系统，M可以对学生信息增删改查，操作数据库。那还需要C层干什么呢？当然了，C层也能够使用sql操作数据库
回复讨论(解决方案)
mvc 的分工是人为划分的，并无明确的界限
一般的说，M 是业务逻辑。即凡是与具体业务相关的部分（除开用户界面）都应该放在这里
由于数据库与具体业务相关，所以不应放在 C 中（不是说 C 中不能操作数据库，而是你强迫自己不在 C 中访问数据库）
M 是数据层，用于数据获取
C 是控制层，用于逻辑控制
可以这样理解
M是数据，C是控制怎样使用数据，V是怎么把数据显示。
mvc 的分工是人为划分的，并无明确的界限
一般的说，M 是业务逻辑。即凡是与具体业务相关的部分（除开用户界面）都应该放在这里
由于数据库与具体业务相关，所以不应放在 C 中（不是说 C 中不能操作数据库，而是你强迫自己不在 C 中访问数据库）
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