3 modularity in abap_ macro,include,subroutines,function modules & groups

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3/18/13 Modularity in ABAP: Macro,Include,Subroutines,Function Modules & Groups

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Modularity in ABAP:

Macro,Include,Subroutines,Function Modules &

Groups

When you modularize source code, you place a sequence of ABAP statements in a module. Then, instead of placing all

of the statements in your main program, you just call the module.When the program is generated, the source code in the

modularization unit is treated as though it were actually physically present in the main program.

Need of Modularization

Improve the structure of the program.

Easy to read the code

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Easy to maintain the code

Avoid redundancy and promotes code reuse

Various Modularization Techniques

Use of Macros

Use of include files

Subroutines

Function Modules

Lets look into each of them in detail :

SAP- ABAP Macro

If you want to reuse the same set of statements more than once in a program, you can include them in a macro.

You can only use a macro within the program in which it is defined, and it can only be called in lines of the program

following its definition.

Macros can be useful for long calculations or complex WRITE statements.

Syntax

DEFINE

Macro Statements

END-OF-DEFINITION

Macros can use Parameters &Nwhere N = 1,2,3

Example:-

DATA: number1 TYPE I VALUE 1.

DEFINE increment.

ADD 1 to &1.

WRITE &1.

END-OF-DEFINITION.

Increment number1.

WRITE number1.

Output: 2

Include Programs


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Include Programs are solely for modularizing source code, and have no parameter interface.

Include programs allow you to use the same source code in different programs. They can be useful if you have lengthy

data declarations that you want to use in different programs.

Syntax

Include

Points to Note

Include programs cannot call themselves.

Include programs must contain complete statements.

Example:

INCLUDE ZILX0004.

WRITE: / User, SY-UNAME,/ Date, SY-DATUM.

================================

PROGRAM ZRPM0001.

INCLUDE ZILX0004.

Subroutines

Subroutines are procedures that you can define in any ABAP program and also call from any program. Subroutines are

normally called internally, that is, they contain sections of code or algorithms that are used frequently locally. If you want

a function to be reusable throughout the system, use a function module.

Syntax-

FORM [].

.

ENDFORM.

= Name of the subroutine

= Parameters being passed

Types of Subroutines

1. Internal

Subroutine defined in same program being called.

Can access all the data objects declared in the main ABAP/4 program.

2. External

Subroutine defined outside the program being called.

Need to use the option or declare data objects in common parts of memory.


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Calling a Subroutine

Internal Subroutines

PERFORM []

= Name of the subroutine

= Parameters being passed

Data declared in main program is automatically available.

External Subroutines

PERFORM () [].

PERFORM () [] [IF FOUND].

PERFORM () IN PROGRAM () [] [IF FOUND].

PERFORM OF [].

Points to Note

Nested calls are allowed in subroutines (i.e. PERFORM within a FORM ENDFORM ).

Recursive calls are also possible.

To define local data, use the DATA statement after FORM . Each time you enter the subroutine, the data is

recreated (with an initial value) and released at the end (from the stack).

To define global data used within a subroutine, use the LOCAL statement after FORM . The values are saved

when you enter the subroutine and then released at the end (from the stack)

Function Modules

Function Modules are general purpose ABAP/4 routines that anyone can use. Infact , there are a large number of

standard function Modules available.

Function Modules are organized into Function Groups: Collections of logically related functions. A Function module

always belongs to a Function Group.

Syntax-

FUNCTION

ENDFUNCTION.

Important information Associated with Function Module

Administration

Import/Changing/Export parameters.

Table Parameters/Exceptions.


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Documentation

Source code LU01 . is the Function Group

Global Data LTOP.Global data for the function group- Accessible across function modules in the

function group.

Main Program SAPL . Contains the list of all the include files for that function group

Call a Function Module

To call a function module, use the CALL FUNCTION statement:

CALL FUNCTION

[EXPORTING f1 = a 1.... f n = a n] [IMPORTING f1 = a 1.... f n = a n] [CHANGING f1 = a 1.... f n

= a n] [TABLES f1 = a 1.... f n = a n] [EXCEPTIONS e1 = r 1.... e n = r n [ERROR_MESSAGE = r

E] [OTHERS = ro]].

Function Groups

Function groups are containers for function modules. Infact, there are a large number of standard Function Groups.All of the function modules in a function group can access the global data of the group.

Like executable programs (type 1) and module pools (type M), function groups can contain screens, selection screens,

and lists.

Points to Note

Function Groups cannot be executed.

The name of a function group can be up to 26 characters long.

When you create a function group or function module, the main program and include programs are generated

automatically.

Function groups encapsulate data.

How to create a Function Group

1. Goto Transaction SE80.

2. Select Program in the DropDown.

3. Write the name of the Function Group That you want to create. Generally User made Function groups start with

Z. e.g. . Hit Enter Key.

4. Note that The TOP Include is create by default if the user checks the option of creating a TOP include.

How to create a Function Module

1. Create a function Group (say ZCAL).

2. Create a function module, set the attributes like (Function group, Application, Short Text and Process Type) and

Save.

3. Include file LZCALU01 will have source code of first function module.

4. Include file LZCALTOP will have global data.

5. Main program SAPLZCAL contains

Global data Include file LZCALTOP

Function modules include file LZCALUXX

User defined Include files LZCALF.., LZCALO.. and LZCALI..


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6. Define interface parameters and Exceptions

7. Write the source code

8. Activate Function Module

9. Testing the Function Module Single Test & Debugging

10. Documenting and Releasing a Function Module

Thats all to Modularity in ABAP.

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3 modularity in abap_ macro,include,subroutines,function modules & groups

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