ABAP Select data from SAP table VAKPA_REF into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VAKPA_REF
*  INTO TABLE @DATA(IT_VAKPA_REF2).
*--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_VAKPA_REF INDEX 1 INTO DATA(WA_VAKPA_REF2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VAKPA_REF>-MANDT = 1.
<VAKPA_REF>-VBELN = 1.
<VAKPA_REF>-AUART = 1.
<VAKPA_REF>-TRVOG = 1.
<VAKPA_REF>-KUNDE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VAKPA_REF-PARVW, sy-vline,
  WA_VAKPA_REF-KUNNR, sy-vline,
  WA_VAKPA_REF-VKORG, sy-vline,
  WA_VAKPA_REF-VTWEG, sy-vline,
  WA_VAKPA_REF-SPART, sy-vline,
  WA_VAKPA_REF-DATAB, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VAKPA_REF 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_VAKPA_REF 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_VAKPA_REF INTO WA_VAKPA_REF.


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

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

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

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

*Conversion exit ALPHA, internal->external for field KUNNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VAKPA_REF-KUNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VAKPA_REF-KUNNR.
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_VAKPA_REF_STR, 
MANDT TYPE STRING,
VBELN TYPE STRING,
AUART TYPE STRING,
TRVOG TYPE STRING,
KUNDE TYPE STRING,
PARVW TYPE STRING,
KUNNR TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
SPART TYPE STRING,
DATAB TYPE STRING,
DATBI TYPE STRING,
VBTYP TYPE STRING,
ABRUF_PART TYPE STRING,
GBSTK TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VAKPA_REF_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_VAKPA_REF_STR-MANDT sy-vline 
WA_VAKPA_REF_STR-VBELN sy-vline 
WA_VAKPA_REF_STR-AUART sy-vline 
WA_VAKPA_REF_STR-TRVOG sy-vline 
WA_VAKPA_REF_STR-KUNDE sy-vline 
WA_VAKPA_REF_STR-PARVW sy-vline 
WA_VAKPA_REF_STR-KUNNR sy-vline 
WA_VAKPA_REF_STR-VKORG sy-vline 
WA_VAKPA_REF_STR-VTWEG sy-vline 
WA_VAKPA_REF_STR-SPART sy-vline 
WA_VAKPA_REF_STR-DATAB sy-vline 
WA_VAKPA_REF_STR-DATBI sy-vline 
WA_VAKPA_REF_STR-VBTYP sy-vline 
WA_VAKPA_REF_STR-ABRUF_PART sy-vline 
WA_VAKPA_REF_STR-GBSTK sy-vline      INTO ld_text SEPARATED BY SPACE.

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