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What is the difference between the function of M and C in the MVC pattern?

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What is the difference between the role of M and C in the MVC pattern?
What is the difference between the role of M and C in the MVC pattern? For example, the establishment of a student information management system, M can change the student information and search, Operation database. What do you need to do with layer C? Of course, the C-tier can also use SQL to manipulate the database
------to solve the idea----------------------
M is the data layer for data acquisition
C is the control layer for logic control

You can understand that.

M is data, C is how to control how the data is used, V is how to display the data.

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