Aspects of Object Orientation using Function Group

by Raghava Vakada, Mouri Tech Solutions

“I would like to explain about Aspects of Object Orientation through “Function Group”. The function group can be created using the standard SAP transaction SE37. Once the function group is created you can declare “Global Variables” in the    function group and can be used any function module which has belong to that function group”. 

In this article I am creating a function group “ZCOUNTER” and created a global variable “COUNTER”. I have created 3 custom function modules “ZSET_COUNTER”, ZSET_INCREMENT and ZGET_COUNTER. The following function modules are called in a report program “ZFG_REPORT”. 

Creating a “Function Group”. 

Create function Group in “SE37” 

Enter the Function Group name “ZCOUNTER” and Short text. 

Click “Save” button and specify the local package. 

Create function module “ZSET_COUNTER” and enter the following details shown below screen shot. 

Goto à Global Data.  

Create Global Variable “COUNTER”, as shown below. 

Save, Check and Activate the Top include program.

Get Back to function Module.

Enter the following source code. 

Save, Check and Activate the function module. 

Create function module “ZSET_INCREMENT” and enter the following details shown below. 

Enter the following code as shown below. 

Save, Check and Activate the function module. 

Create function module “ZGET_COUNTER” and enter the following details shown below. 

Enter the following code as shown below . 

Create the report program “ZFG_REPORT”  and enter the below code. 

*&---------------------------------------------------------------------*
*& Report  ZFG_REPORT                                                  *
*&                                                                     *
*&---------------------------------------------------------------------*
*&                                                                     *
*&                                                                     *
*&---------------------------------------------------------------------*

REPORT  ZFG_REPORT                              .

data number type i value 5.

CALL FUNCTION 'ZSET_COUNTER'
  EXPORTING
    VAL           = number
          .

do 3 times.

CALL FUNCTION 'ZSET_INCREMENT'
          .
enddo.

CALL FUNCTION 'ZGET_COUNTER'
 IMPORTING
   GETVAL        = number.
          .

write :/ 'The number has value : ' color 7, number color 5. 

After this section of the program has been processed, the program variable NUMBER will have the value 8.