ABAP Select data from SAP table VKAOF into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VKAOF
*  INTO TABLE @DATA(IT_VKAOF2).
*--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_VKAOF INDEX 1 INTO DATA(WA_VKAOF2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VKAOF>-MANDT = 1.
<VKAOF>-VKORG = 1.
<VKAOF>-TRVOG = 1.
<VKAOF>-VKBUR = 1.
<VKAOF>-VKGRP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VKAOF-VTWEG, sy-vline,
  WA_VKAOF-SPART, sy-vline,
  WA_VKAOF-KTAAR, sy-vline,
  WA_VKAOF-KUNNR, sy-vline,
  WA_VKAOF-KTADA, sy-vline,
  WA_VKAOF-ERNAM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VKAOF 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_VKAOF 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_VKAOF INTO WA_VKAOF.


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

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

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

*Conversion exit ALPHA, internal->external for field ADRNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VKAOF-ADRNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VKAOF-ADRNR.
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_VKAOF_STR, 
MANDT TYPE STRING,
VKORG TYPE STRING,
TRVOG TYPE STRING,
VKBUR TYPE STRING,
VKGRP TYPE STRING,
VTWEG TYPE STRING,
SPART TYPE STRING,
KTAAR TYPE STRING,
KUNNR TYPE STRING,
KTADA TYPE STRING,
ERNAM TYPE STRING,
VBELN TYPE STRING,
KTAFK TYPE STRING,
ADRNR_AG TYPE STRING,
ADRNR TYPE STRING,
KTABG TYPE STRING,
KTAEN TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VKAOF_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_VKAOF_STR-MANDT sy-vline 
WA_VKAOF_STR-VKORG sy-vline 
WA_VKAOF_STR-TRVOG sy-vline 
WA_VKAOF_STR-VKBUR sy-vline 
WA_VKAOF_STR-VKGRP sy-vline 
WA_VKAOF_STR-VTWEG sy-vline 
WA_VKAOF_STR-SPART sy-vline 
WA_VKAOF_STR-KTAAR sy-vline 
WA_VKAOF_STR-KUNNR sy-vline 
WA_VKAOF_STR-KTADA sy-vline 
WA_VKAOF_STR-ERNAM sy-vline 
WA_VKAOF_STR-VBELN sy-vline 
WA_VKAOF_STR-KTAFK sy-vline 
WA_VKAOF_STR-ADRNR_AG sy-vline 
WA_VKAOF_STR-ADRNR sy-vline 
WA_VKAOF_STR-KTABG sy-vline 
WA_VKAOF_STR-KTAEN sy-vline      INTO ld_text SEPARATED BY SPACE.

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