ABAP Select data from SAP table KOMPBWA into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP KOMPBWA table and store it within an internal table, including using the newer @DATA inline declaration methods. It also shows you various ways to process this data using ABAP work area, inline declaration or field symbols including executing all the relevant CONVERSION_EXIT routines specific to KOMPBWA. See here for more generic Select statement tips.

Sometimes data within SAP is stored within the database table in a different format to what it is displayed to the user. These input/output conversation FM routines are what translates the data between the two formats.

There is also a full declaration of the KOMPBWA table where each field has a char/string type for you to simply copy and paste. This allows you to use processing that is only available to these field types such as the CONCATENATE statement.

DATA: IT_KOMPBWA TYPE STANDARD TABLE OF KOMPBWA,
      WA_KOMPBWA TYPE KOMPBWA,
      GD_STR TYPE STRING.

DATA: lo_typedescr type REF TO cl_abap_typedescr.
DATA: lv_fieldname type fieldname.

FIELD-SYMBOLS: <FIELD> TYPE any.
FIELD-SYMBOLS: <KOMPBWA> TYPE KOMPBWA.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_KOMPBWA.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM KOMPBWA
  INTO TABLE IT_KOMPBWA.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KOMPBWA
*  INTO TABLE @DATA(IT_KOMPBWA2).
*--Further methods of using ABAP code to  select data from SAP database tables

*You can also declare the header/work area using the in-line DATA declaration method
READ TABLE IT_KOMPBWA INDEX 1 INTO DATA(WA_KOMPBWA2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_KOMPBWA ASSIGNING <KOMPBWA>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KOMPBWA>-VLFKZ = 1.
<KOMPBWA>-VLFKZA = 1.
<KOMPBWA>-KUNNR = 1.
<KOMPBWA>-WERKS = 1.
<KOMPBWA>-VKORG = 1.

ENDLOOP.

LOOP AT IT_KOMPBWA INTO WA_KOMPBWA.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KOMPBWA-VTWEG, sy-vline,
  WA_KOMPBWA-ABFDT, sy-vline,
  WA_KOMPBWA-ABFTP, sy-vline,
  WA_KOMPBWA-ABAST, sy-vline,
  WA_KOMPBWA-MANDT, sy-vline,
  WA_KOMPBWA-AAVIT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KOMPBWA you want to display...

  WRITE:/ sy-uline.
* Aternatively use generic code to Write field values (and NAME) to screen report
  DO.
    ASSIGN COMPONENT sy-index OF STRUCTURE wa_KOMPBWA TO <field>.
    IF sy-subrc <> 0. EXIT. ENDIF.
    WRITE:/ 'Field Value', <field>, sy-vline.
    gd_str = <field> .
    lo_typedescr ?= CL_ABAP_DATADESCR=>DESCRIBE_BY_DATA( <field> ).
    lv_fieldname = lo_typedescr->GET_RELATIVE_NAME( ).
    WRITE:/ 'Field Name', lv_fieldname.
  ENDDO.

  
*Redo loop but convert all fields from internal to out value  
LOOP AT IT_KOMPBWA INTO WA_KOMPBWA.


*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Convert all fields to display/output versions using conversion routines
  PERFORM convert_all_field_values CHANGING wa_EKKO.
	 
ENDLOOP.

  
*&---------------------------------------------------------------------*
*& Form convert_all_field_values
*&---------------------------------------------------------------------*
FORM convert_all_field_values CHANGING p_EKKO LIKE wa_EKKO.
DATA: ld_input(1000) TYPE c, ld_output(1000) TYPE C.

*Conversion exit ALPHA, internal->external for field KUNNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KOMPBWA-KUNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMPBWA-KUNNR.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_KOMPBWA_STR, 
VLFKZ TYPE STRING,
VLFKZA TYPE STRING,
KUNNR TYPE STRING,
WERKS TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
ABFDT TYPE STRING,
ABFTP TYPE STRING,
ABAST TYPE STRING,
MANDT TYPE STRING,
AAVIT TYPE STRING,
KNARIFI TYPE STRING,
AMITB TYPE STRING,
ARMEL TYPE STRING,
BM_MIT_WM TYPE STRING,
BM_FUELLEN_AUTO TYPE STRING,
AMITV TYPE STRING,
AANZM TYPE STRING,
BANZM TYPE STRING,
DATKT TYPE STRING,
DATPT TYPE STRING,
DATLW TYPE STRING,
DATWM TYPE STRING,
DATEK TYPE STRING,
DATVK TYPE STRING,
DATNP TYPE STRING,
AAMEB TYPE STRING,
AAMEV TYPE STRING,
APSTP TYPE STRING,
AAFBG TYPE STRING,
ASNRM TYPE STRING,
TATYP TYPE STRING,
WMERF TYPE STRING,
BMERF TYPE STRING,
AENDG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KOMPBWA_STR type T_EKKO_STR.

DATA: ld_text TYPE string.

LOOP AT IT_EKKO INTO WA_EKKO.
  MOVE-CORRESPONDING wa_EKKO TO WA_EKKO_STR.
  CONCATENATE: sy-vline
WA_KOMPBWA_STR-VLFKZ sy-vline 
WA_KOMPBWA_STR-VLFKZA sy-vline 
WA_KOMPBWA_STR-KUNNR sy-vline 
WA_KOMPBWA_STR-WERKS sy-vline 
WA_KOMPBWA_STR-VKORG sy-vline 
WA_KOMPBWA_STR-VTWEG sy-vline 
WA_KOMPBWA_STR-ABFDT sy-vline 
WA_KOMPBWA_STR-ABFTP sy-vline 
WA_KOMPBWA_STR-ABAST sy-vline 
WA_KOMPBWA_STR-MANDT sy-vline 
WA_KOMPBWA_STR-AAVIT sy-vline 
WA_KOMPBWA_STR-KNARIFI sy-vline 
WA_KOMPBWA_STR-AMITB sy-vline 
WA_KOMPBWA_STR-ARMEL sy-vline 
WA_KOMPBWA_STR-BM_MIT_WM sy-vline 
WA_KOMPBWA_STR-BM_FUELLEN_AUTO sy-vline 
WA_KOMPBWA_STR-AMITV sy-vline 
WA_KOMPBWA_STR-AANZM sy-vline 
WA_KOMPBWA_STR-BANZM sy-vline 
WA_KOMPBWA_STR-DATKT sy-vline 
WA_KOMPBWA_STR-DATPT sy-vline 
WA_KOMPBWA_STR-DATLW sy-vline 
WA_KOMPBWA_STR-DATWM sy-vline 
WA_KOMPBWA_STR-DATEK sy-vline 
WA_KOMPBWA_STR-DATVK sy-vline 
WA_KOMPBWA_STR-DATNP sy-vline 
WA_KOMPBWA_STR-AAMEB sy-vline 
WA_KOMPBWA_STR-AAMEV sy-vline 
WA_KOMPBWA_STR-APSTP sy-vline 
WA_KOMPBWA_STR-AAFBG sy-vline 
WA_KOMPBWA_STR-ASNRM sy-vline 
WA_KOMPBWA_STR-TATYP sy-vline 
WA_KOMPBWA_STR-WMERF sy-vline 
WA_KOMPBWA_STR-BMERF sy-vline 
WA_KOMPBWA_STR-AENDG sy-vline      INTO ld_text SEPARATED BY SPACE.

*Add any further fields from structure WA_EKKO_STR you want to CONCATENATE...
ENDLOOP.
ENDFORM.