ABAP Select data from SAP table VRKPA into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP VRKPA 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 VRKPA. 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 VRKPA 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_VRKPA TYPE STANDARD TABLE OF VRKPA,
      WA_VRKPA TYPE VRKPA,
      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: <VRKPA> TYPE VRKPA.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VRKPA
*  INTO TABLE @DATA(IT_VRKPA2).
*--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_VRKPA INDEX 1 INTO DATA(WA_VRKPA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VRKPA>-MANDT = 1.
<VRKPA>-KUNDE = 1.
<VRKPA>-PARVW = 1.
<VRKPA>-VKORG = 1.
<VRKPA>-FKDAT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VRKPA-VTWEG, sy-vline,
  WA_VRKPA-FKART, sy-vline,
  WA_VRKPA-KUNNR, sy-vline,
  WA_VRKPA-KUNAG, sy-vline,
  WA_VRKPA-VBTYP, sy-vline,
  WA_VRKPA-ERNAM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VRKPA 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_VRKPA 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_VRKPA INTO WA_VRKPA.


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

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

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

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

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

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

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

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

*Conversion exit GJAHR, internal->external for field GJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_VRKPA-GJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VRKPA-GJAHR.
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_VRKPA_STR, 
MANDT TYPE STRING,
KUNDE TYPE STRING,
PARVW TYPE STRING,
VKORG TYPE STRING,
FKDAT TYPE STRING,
VTWEG TYPE STRING,
FKART TYPE STRING,
KUNNR TYPE STRING,
KUNAG TYPE STRING,
VBTYP TYPE STRING,
ERNAM TYPE STRING,
VBELN TYPE STRING,
FKTYP TYPE STRING,
ADRNR TYPE STRING,
ADRNR_RG TYPE STRING,
BELNR TYPE STRING,
GJAHR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VRKPA_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_VRKPA_STR-MANDT sy-vline 
WA_VRKPA_STR-KUNDE sy-vline 
WA_VRKPA_STR-PARVW sy-vline 
WA_VRKPA_STR-VKORG sy-vline 
WA_VRKPA_STR-FKDAT sy-vline 
WA_VRKPA_STR-VTWEG sy-vline 
WA_VRKPA_STR-FKART sy-vline 
WA_VRKPA_STR-KUNNR sy-vline 
WA_VRKPA_STR-KUNAG sy-vline 
WA_VRKPA_STR-VBTYP sy-vline 
WA_VRKPA_STR-ERNAM sy-vline 
WA_VRKPA_STR-VBELN sy-vline 
WA_VRKPA_STR-FKTYP sy-vline 
WA_VRKPA_STR-ADRNR sy-vline 
WA_VRKPA_STR-ADRNR_RG sy-vline 
WA_VRKPA_STR-BELNR sy-vline 
WA_VRKPA_STR-GJAHR sy-vline      INTO ld_text SEPARATED BY SPACE.

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