ABAP Select data from SAP table VWPWPKU into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VWPWPKU
*  INTO TABLE @DATA(IT_VWPWPKU2).
*--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_VWPWPKU INDEX 1 INTO DATA(WA_VWPWPKU2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VWPWPKU>-MANDT = 1.
<VWPWPKU>-RANL = 1.
<VWPWPKU>-RHANDPL = 1.
<VWPWPKU>-SKURSART = 1.
<VWPWPKU>-DKURS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VWPWPKU-WAERS, sy-vline,
  WA_VWPWPKU-BKUR, sy-vline,
  WA_VWPWPKU-PKUR, sy-vline,
  WA_VWPWPKU-SKHERK, sy-vline,
  WA_VWPWPKU-SOBJEKT, sy-vline,
  WA_VWPWPKU-RBEAR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VWPWPKU 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_VWPWPKU 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_VWPWPKU INTO WA_VWPWPKU.


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

*Conversion exit ALPHA, internal->external for field RFGEB
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VWPWPKU-RFGEB
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VWPWPKU-RFGEB.
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_VWPWPKU_STR, 
MANDT TYPE STRING,
RANL TYPE STRING,
RHANDPL TYPE STRING,
SKURSART TYPE STRING,
DKURS TYPE STRING,
WAERS TYPE STRING,
BKUR TYPE STRING,
PKUR TYPE STRING,
SKHERK TYPE STRING,
SOBJEKT TYPE STRING,
RBEAR TYPE STRING,
DBEAR TYPE STRING,
TBEAR TYPE STRING,
RFGEB TYPE STRING,
DFREI TYPE STRING,
TFREI TYPE STRING,
SKZUSA TYPE STRING,
SKABSCH TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VWPWPKU_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_VWPWPKU_STR-MANDT sy-vline 
WA_VWPWPKU_STR-RANL sy-vline 
WA_VWPWPKU_STR-RHANDPL sy-vline 
WA_VWPWPKU_STR-SKURSART sy-vline 
WA_VWPWPKU_STR-DKURS sy-vline 
WA_VWPWPKU_STR-WAERS sy-vline 
WA_VWPWPKU_STR-BKUR sy-vline 
WA_VWPWPKU_STR-PKUR sy-vline 
WA_VWPWPKU_STR-SKHERK sy-vline 
WA_VWPWPKU_STR-SOBJEKT sy-vline 
WA_VWPWPKU_STR-RBEAR sy-vline 
WA_VWPWPKU_STR-DBEAR sy-vline 
WA_VWPWPKU_STR-TBEAR sy-vline 
WA_VWPWPKU_STR-RFGEB sy-vline 
WA_VWPWPKU_STR-DFREI sy-vline 
WA_VWPWPKU_STR-TFREI sy-vline 
WA_VWPWPKU_STR-SKZUSA sy-vline 
WA_VWPWPKU_STR-SKABSCH sy-vline      INTO ld_text SEPARATED BY SPACE.

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