In ABAP programming PERFORM statement is used for calling a subroutine ( Piece of reusable functional code defined with FORM statement ). We can call the subroutine defined in the current executing program or from an external program. A subroutine will be enclosed in a FORM and ENDFORM statements. Values are passing to subroutine by USING & CHANGING additions. See an Example Program.
Syntax and variants of this statement are
- PERFORM subroutine_name .
It calls the specified subroutine from the currently executing program - PERFORM subroutine_name(external_program_name).
It calls the specified subroutine from the an external program - PERFORM subroutine_name IN PROGRAM external_program_name.
Same as previous, but we can specify both dynamically - PERFORM index_no OF subroutine_name1 subroutine_name2 subroutine_name3
Subroutine names are there in the statement, and we can call it with the order number like 1 ,2 etc - PERFORM subroutine_name ON COMMIT
Subroutine will be called only after COMMIT statement
Additions used with PERFORM statement
- USING
- CHANGING
- TABLES
- IF FOUND
- LEVEL ( Only with COMMIT )
Main runtime errors occuring with ABAP PERFORM
- PERFORMANCE_PARAMETER_MISSING
- PERFORM_PARAMETER_COUNT
- PERFORM_TOO_MANY_PARAMETERS
- PERFORM_CONFLICT_TYPE
- PERFORM_CONFLICT_GENERIC_TYPE
- PERFORM_BASE_WRONG_ALIGNMENT
- PERFORM_PARAMETER_TOO_SHORT
- PERFORM_TABLE_REQUIRED
- PERFORM_BASE_LITL
- PERFORM_NOT_FOUND
- PERFORM_INDEX_0
- PERFORM_INDEX_NEGATIVE
- PERFORM_INDEX_TOO_LARGE
Here is sample program with source code
