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Archive for April 2, 2008
达人开课之ABAP tips2：MVC
April 2, 2008 by 宝妈.
MVC means ‘Model Control View’. It is a very traditional way to structure the program. Usually it is used in OO (object-oriented) programming. Well, we can also apply this good thinking of programming in the ABAP4 which is process-oriented as well.
The normal structure of ABAP4 program is like this:
1 Definition
2 Input screen definition
3 Input screen event
4 Start-of-selection
5 End-of-selection
Then how can we apply MVC thinking? It is going to be like this:
Aarrange all the input procedure in the 2 & 3 part. For example, authorization check.
Arrange all the business logic control in the 4 part. Arrange all the data access in the subroutines which will be used in the business logic control.
At last, move all the output procedure in the 5 part.
It will be much easier for the descendant to understand the program in the future using this MVC thinking.
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