ABAP Select data from SAP table CVWPWPKU into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CVWPWPKU
*  INTO TABLE @DATA(IT_CVWPWPKU2).
*--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_CVWPWPKU INDEX 1 INTO DATA(WA_CVWPWPKU2).


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

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

ENDLOOP.

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

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


*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_CVWPWPKU-RANL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CVWPWPKU-RANL.
WRITE:/ 'New Value:', ld_input.

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

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