concatenationabapfunction-module

Concatenate fields of a dynamic structure


How do we concatenate fields of a dynamic work area? The idea is in the below code:

LOOP AT lt_final INTO DATA(ls_final).
  CONCATENATE ls_final-field1
              ls_final-field2
              ls_final-field3
              ls_final-field4
              ls_final-field5
         INTO ls_attachment SEPARATED BY lc_tab.   "lc_tab is horizontal tab

  APPEND ls_attachment TO lt_attachment.
  CLEAR: ls_attachment.
ENDLOOP.

(This code will be used for sending email attachment.) Now, my problem is, the internal table in the above code is a dynamic internal table, therefore I am not sure how many fields will be there and the field names as well.

How do I concatenate the fields? Any idea, please help..

LOOP AT <dynamic_table> INTO DATA(ls_final).
  CONCATENATE ls_final-(?)
              ls_final-(?)
              ls_final-(?)
              ls_final-(?)
              ls_final-(?) 
              "or more fields insert here depending on dynamic table
         INTO ls_attachment SEPARATED BY lc_tab.   "lc_tab is horizontal tab

  APPEND ls_attachment TO lt_attachment.
  CLEAR: ls_attachment.
ENDLOOP.

Solution

  • FIELD-SYMBOLS: <lv_field> TYPE ANY.
    
    LOOP AT lt_final
         ASSIGNING FIELD-SYMBOL(<ls_final>).
      DO.
        ASSIGN COMPONENT sy-index
               OF STRUCTURE <ls_final>
               TO <lv_field>.
        IF sy-subrc EQ 0.
          IF sy-index EQ 1.
            ls_attachment = <lv_field>.
          ELSE.
            ls_attachment = ls_attachment && lc_tab && <lv_field>.
          ENDIF.
        ELSE.
          EXIT.
        ENDIF.
      ENDDO.
    ENDLOOP.
    

    I hope it is self explaining, but: You can use the system variable (sy-index), it is incremented automatically by SAP. In the first step, just copy the value, there is nothing to concatenate yet (otherwise there will be an unnecessary lc_tab at the beginning of the string).