ABAP Select data from SAP table KOMPD0 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP KOMPD0 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 KOMPD0. 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 KOMPD0 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_KOMPD0 TYPE STANDARD TABLE OF KOMPD0,
      WA_KOMPD0 TYPE KOMPD0,
      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: <KOMPD0> TYPE KOMPD0.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_KOMPD0.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM KOMPD0
  INTO TABLE IT_KOMPD0.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KOMPD0
*  INTO TABLE @DATA(IT_KOMPD02).
*--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_KOMPD0 INDEX 1 INTO DATA(WA_KOMPD02).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_KOMPD0 ASSIGNING <KOMPD0>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KOMPD0>-MATNR = 1.
<KOMPD0>-CHARG = 1.
<KOMPD0>-WERKS = 1.
<KOMPD0>-EANNR = 1.
<KOMPD0>-WAGRP = 1.

ENDLOOP.

LOOP AT IT_KOMPD0 INTO WA_KOMPD0.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KOMPD0-KONDM, sy-vline,
  WA_KOMPD0-MATKL, sy-vline,
  WA_KOMPD0-INFNR, sy-vline,
  WA_KOMPD0-PRODH, sy-vline,
  WA_KOMPD0-PMATN, sy-vline,
  WA_KOMPD0-VKGRU, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KOMPD0 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_KOMPD0 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_KOMPD0 INTO WA_KOMPD0.


*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 MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_KOMPD0-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMPD0-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field INFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KOMPD0-INFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMPD0-INFNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field PMATN
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_KOMPD0-PMATN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMPD0-PMATN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MATWA
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_KOMPD0-MATWA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMPD0-MATWA.
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_KOMPD0_STR, 
MATNR TYPE STRING,
CHARG TYPE STRING,
WERKS TYPE STRING,
EANNR TYPE STRING,
WAGRP TYPE STRING,
KONDM TYPE STRING,
MATKL TYPE STRING,
INFNR TYPE STRING,
PRODH TYPE STRING,
PMATN TYPE STRING,
VKGRU TYPE STRING,
VKAUS TYPE STRING,
MTART TYPE STRING,
MATWA TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KOMPD0_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_KOMPD0_STR-MATNR sy-vline 
WA_KOMPD0_STR-CHARG sy-vline 
WA_KOMPD0_STR-WERKS sy-vline 
WA_KOMPD0_STR-EANNR sy-vline 
WA_KOMPD0_STR-WAGRP sy-vline 
WA_KOMPD0_STR-KONDM sy-vline 
WA_KOMPD0_STR-MATKL sy-vline 
WA_KOMPD0_STR-INFNR sy-vline 
WA_KOMPD0_STR-PRODH sy-vline 
WA_KOMPD0_STR-PMATN sy-vline 
WA_KOMPD0_STR-VKGRU sy-vline 
WA_KOMPD0_STR-VKAUS sy-vline 
WA_KOMPD0_STR-MTART sy-vline 
WA_KOMPD0_STR-MATWA sy-vline      INTO ld_text SEPARATED BY SPACE.

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