ABAP Select data from SAP table VAKCR into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VAKCR
*  INTO TABLE @DATA(IT_VAKCR2).
*--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_VAKCR INDEX 1 INTO DATA(WA_VAKCR2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VAKCR>-MANDT = 1.
<VAKCR>-KKBER = 1.
<VAKCR>-CMGST = 1.
<VAKCR>-SBGRP = 1.
<VAKCR>-CMNGV = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VAKCR-KNKLI, sy-vline,
  WA_VAKCR-CTLPC, sy-vline,
  WA_VAKCR-GRUPP, sy-vline,
  WA_VAKCR-CMFRE, sy-vline,
  WA_VAKCR-CMNUP, sy-vline,
  WA_VAKCR-VKORG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VAKCR 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_VAKCR 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_VAKCR INTO WA_VAKCR.


*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 KNKLI
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VAKCR-KNKLI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VAKCR-KNKLI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VBELN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VAKCR-VBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VAKCR-VBELN.
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_VAKCR_STR, 
MANDT TYPE STRING,
KKBER TYPE STRING,
CMGST TYPE STRING,
SBGRP TYPE STRING,
CMNGV TYPE STRING,
KNKLI TYPE STRING,
CTLPC TYPE STRING,
GRUPP TYPE STRING,
CMFRE TYPE STRING,
CMNUP TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
SPART TYPE STRING,
VBELN TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VAKCR_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_VAKCR_STR-MANDT sy-vline 
WA_VAKCR_STR-KKBER sy-vline 
WA_VAKCR_STR-CMGST sy-vline 
WA_VAKCR_STR-SBGRP sy-vline 
WA_VAKCR_STR-CMNGV sy-vline 
WA_VAKCR_STR-KNKLI sy-vline 
WA_VAKCR_STR-CTLPC sy-vline 
WA_VAKCR_STR-GRUPP sy-vline 
WA_VAKCR_STR-CMFRE sy-vline 
WA_VAKCR_STR-CMNUP sy-vline 
WA_VAKCR_STR-VKORG sy-vline 
WA_VAKCR_STR-VTWEG sy-vline 
WA_VAKCR_STR-SPART sy-vline 
WA_VAKCR_STR-VBELN sy-vline      INTO ld_text SEPARATED BY SPACE.

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