ABAP Select data from SAP table KOMKG0 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP KOMKG0 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 KOMKG0. 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 KOMKG0 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_KOMKG0 TYPE STANDARD TABLE OF KOMKG0,
      WA_KOMKG0 TYPE KOMKG0,
      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: <KOMKG0> TYPE KOMKG0.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_KOMKG0.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM KOMKG0
  INTO TABLE IT_KOMKG0.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KOMKG0
*  INTO TABLE @DATA(IT_KOMKG02).
*--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_KOMKG0 INDEX 1 INTO DATA(WA_KOMKG02).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_KOMKG0 ASSIGNING <KOMKG0>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KOMKG0>-VKORG = 1.
<KOMKG0>-VTWEG = 1.
<KOMKG0>-SPART = 1.
<KOMKG0>-KDGRP = 1.
<KOMKG0>-ALAND = 1.

ENDLOOP.

LOOP AT IT_KOMKG0 INTO WA_KOMKG0.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KOMKG0-WKREG, sy-vline,
  WA_KOMKG0-WKCOU, sy-vline,
  WA_KOMKG0-WKCTY, sy-vline,
  WA_KOMKG0-BUKRS, sy-vline,
  WA_KOMKG0-KUNNR, sy-vline,
  WA_KOMKG0-KNRZE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KOMKG0 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_KOMKG0 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_KOMKG0 INTO WA_KOMKG0.


*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_KOMKG0-KUNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMKG0-KUNNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KNRZE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KOMKG0-KNRZE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMKG0-KNRZE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LIFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KOMKG0-LIFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMKG0-LIFNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AUART, internal->external for field AUART
CALL FUNCTION 'CONVERSION_EXIT_AUART_OUTPUT'
  EXPORTING
    input =                      WA_KOMKG0-AUART
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMKG0-AUART.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LIFRE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KOMKG0-LIFRE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMKG0-LIFRE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KUNAG
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KOMKG0-KUNAG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMKG0-KUNAG.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KUNWE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KOMKG0-KUNWE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMKG0-KUNWE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field SPDNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KOMKG0-SPDNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMKG0-SPDNR.
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_KOMKG0_STR, 
VKORG TYPE STRING,
VTWEG TYPE STRING,
SPART TYPE STRING,
KDGRP TYPE STRING,
ALAND TYPE STRING,
WKREG TYPE STRING,
WKCOU TYPE STRING,
WKCTY TYPE STRING,
BUKRS TYPE STRING,
KUNNR TYPE STRING,
KNRZE TYPE STRING,
LIFNR TYPE STRING,
INCO1 TYPE STRING,
INCO2 TYPE STRING,
LAND1 TYPE STRING,
REGIO TYPE STRING,
COUNC TYPE STRING,
CITYC TYPE STRING,
AUART TYPE STRING,
EKORG TYPE STRING,
LIFRE TYPE STRING,
VBTYP TYPE STRING,
KUNAG TYPE STRING,
KUNWE TYPE STRING,
SPDNR TYPE STRING,
VRTNR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KOMKG0_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_KOMKG0_STR-VKORG sy-vline 
WA_KOMKG0_STR-VTWEG sy-vline 
WA_KOMKG0_STR-SPART sy-vline 
WA_KOMKG0_STR-KDGRP sy-vline 
WA_KOMKG0_STR-ALAND sy-vline 
WA_KOMKG0_STR-WKREG sy-vline 
WA_KOMKG0_STR-WKCOU sy-vline 
WA_KOMKG0_STR-WKCTY sy-vline 
WA_KOMKG0_STR-BUKRS sy-vline 
WA_KOMKG0_STR-KUNNR sy-vline 
WA_KOMKG0_STR-KNRZE sy-vline 
WA_KOMKG0_STR-LIFNR sy-vline 
WA_KOMKG0_STR-INCO1 sy-vline 
WA_KOMKG0_STR-INCO2 sy-vline 
WA_KOMKG0_STR-LAND1 sy-vline 
WA_KOMKG0_STR-REGIO sy-vline 
WA_KOMKG0_STR-COUNC sy-vline 
WA_KOMKG0_STR-CITYC sy-vline 
WA_KOMKG0_STR-AUART sy-vline 
WA_KOMKG0_STR-EKORG sy-vline 
WA_KOMKG0_STR-LIFRE sy-vline 
WA_KOMKG0_STR-VBTYP sy-vline 
WA_KOMKG0_STR-KUNAG sy-vline 
WA_KOMKG0_STR-KUNWE sy-vline 
WA_KOMKG0_STR-SPDNR sy-vline 
WA_KOMKG0_STR-VRTNR sy-vline      INTO ld_text SEPARATED BY SPACE.

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