When and where to use REUSE_ALV_GRID_DISPLAY,CL_GUI_ALV_GRID,CL_SALV_TABLE

Question

Hi All,
I am not trying to ask a interview question here.
I have come across many links ,many programs that talk about ALV display like REUSE_ALV_GRID_DISPLAY,CL_GUI_ALV_GRID,CL_SALV_TABLE but i am not able to clearly understand why is one more advantageous than another one and in what scenarios we need to use each one.
Can somebody help me /others who need similar clarification regarding these things
Thanks
Bala Duvvuri

Answer 1

Hi
1.REUSE_ALV_GRID_DISPLAY is used for displaying alv using functional module.It is more of a procedural approach.If you have used it in any of your programs that you would know that in order to do anythng in alv like displaying header or handling any event or anything else  you have to make respective function(form)  and internal tables and pass that function or internal table in the respective parameters of REUSE_ALV_GRID_DISPLAY.
2.CL_GUI_ALV_GRID is the oops approach for displaying alv.In this we don't use any functional modules.Instead of this we use the concept of classes and objects.
3.CL_SALV_TABLE is the also the oops approach but more efficient and advanced as compared to the above one.It is the main class used to create the simple 2D table it create a reference variable for this class.In this there is no need to create field catalog , table def. eveything can be handled dynamically....It is preferred to use this approach for alv.
Thanks