ABAP Macros for dynamically looping internal tables

ABAP Macros for dynamically looping internal tables

Lot of times when writing an ABAP program with internal tables, we need to loop at the Internal tables and write each row data on the screen. The attached code has macros defined which can be used to loop at any internal table dynamically to have the report produced by each row.


REPORT ZTABLOOP.
*--This program has two macros which can be used in any program for
*--dynamically looping at internal table and reporting each row field

DATA: BEGIN OF ITAB OCCURS 0,
        A(1),
        B(3),
        C(2),
      END OF ITAB.
DATA: TNAME(30).

FIELD-SYMBOLS: <T> TYPE STANDARD TABLE,
               <F>,
               <W>.

DEFINE LOOP_ITAB.
*--table passed with &1
  LOOP AT &1.
    DO.
      IF SY-INDEX = 1.
        NEW-LINE.
      ENDIF.
      ASSIGN COMPONENT SY-INDEX OF STRUCTURE &1 TO <F>.
      IF SY-SUBRC = 0.
        WRITE: <F>.
      ELSE.
        EXIT.
      ENDIF.
    ENDDO.
  ENDLOOP.
END-OF-DEFINITION.

DEFINE LOOP_ITAB_DYNAMIC.
*--Table not known - name Passed in &1
  CONCATENATE &1 '[]' INTO &1.
  ASSIGN (&1) TO <T>.
  LOOP AT <T> ASSIGNING <W>.
    DO.
      IF SY-INDEX = 1.
        NEW-LINE.
      ENDIF.
      ASSIGN COMPONENT SY-INDEX OF STRUCTURE <W> TO <F>.
      IF SY-SUBRC = 0.
        WRITE: <F>.
      ELSE.
        EXIT.
      ENDIF.
    ENDDO.
  ENDLOOP.
END-OF-DEFINITION.


START-OF-SELECTION.
*--add some data

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  ITAB-A = '1'. ITAB-B = 'ABC'. ITAB-C = '56'. APPEND ITAB.
  ITAB-A = '2'. ITAB-B = 'ABC'. ITAB-C = '56'. APPEND ITAB.
  ITAB-A = '3'. ITAB-B = 'ABC'. ITAB-C = '56'. APPEND ITAB.
* loop via macro
  LOOP_ITAB ITAB.
  SKIP.
* loop with another approach
  TNAME = 'ITAB'.
  LOOP_ITAB_DYNAMIC TNAME.
END-OF-SELECTION.

This was first published in January 2002

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