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We are using class alv and function alv, what is the difference between those options?

Sandra Rossi
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Merve Gül
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1 Answers1

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  • Some of the differences:

    • You can create screens using function modules however classes have to call separate program to generate screens.
    • Classes are more secure than FMs.
    • Class type increases the performance.
    • Class type is OO, it allows more flexibility. Can have multiple ALVs in one screen.
    • Classes will allow reusability better than FM because being Object Oriented.
    • Classes are instantiable while function groups are not.
    • Objects are the instance of class but FMs are not instances of a Function Group.
    • Function modules can be executed asynchronously and can be called by other systems remotely also.
    • A program can work with instances of several function groups at the same time however it cannot work with several instances of a single function group.

*This referance could be helpful too.

Hope it was helpful

Talha

Mtu
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  • This is very useful answer, thanks. I have another question too actually, how can i understand is the code written with functions or with class? Is there an obvious difference between the code writing? Like, is there a class definition into class alv's code? – Merve Gül Jul 10 '12 at 13:18
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    Those are written in code differently, for functions you can use REUSE_ALV_* methods and for Classes it would be like "CL_SALV_TABLE", get this [link](http://wiki.sdn.sap.com/wiki/display/ABAP/ABAP+-+Developing+Interactive+ALV+Report+using+OOABAP) as an example for OO SALV Classes. [HERE IS AN EXAMPLE](http://wiki.sdn.sap.com/wiki/display/ABAP/ALV+grid+control+with+2+different+approaches%21) for ALV grid control with 2 different approaches. Hope its helpful. – Mtu Jul 10 '12 at 13:28