ABAP Select data from SAP table VWKMPO into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VWKMPO
*  INTO TABLE @DATA(IT_VWKMPO2).
*--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_VWKMPO INDEX 1 INTO DATA(WA_VWKMPO2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VWKMPO>-MANDT = 1.
<VWKMPO>-KMNR = 1.
<VWKMPO>-POSNR = 1.
<VWKMPO>-REFRANL = 1.
<VWKMPO>-REFUNIT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VWKMPO-AUSART, sy-vline,
  WA_VWKMPO-RANL, sy-vline,
  WA_VWKMPO-VZ, sy-vline,
  WA_VWKMPO-BESTAEN, sy-vline,
  WA_VWKMPO-BWKOMP, sy-vline,
  WA_VWKMPO-BWFAKT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VWKMPO 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_VWKMPO 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_VWKMPO INTO WA_VWKMPO.


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

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

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

*Conversion exit ALPHA, internal->external for field DEAL_NUMBER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VWKMPO-DEAL_NUMBER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VWKMPO-DEAL_NUMBER.
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_VWKMPO_STR, 
MANDT TYPE STRING,
KMNR TYPE STRING,
POSNR TYPE STRING,
REFRANL TYPE STRING,
REFUNIT TYPE STRING,
AUSART TYPE STRING,
RANL TYPE STRING,
VZ TYPE STRING,
BESTAEN TYPE STRING,
BWKOMP TYPE STRING,
BWFAKT TYPE STRING,
MAXBW TYPE STRING,
WAEHRUNG TYPE STRING,
BWKONST TYPE STRING,
REF6B TYPE STRING,
KGV_FLAG TYPE STRING,
SBWHR_FIX TYPE STRING,
DEAL_NUMBER TYPE STRING,
COMPANY_CODE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VWKMPO_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_VWKMPO_STR-MANDT sy-vline 
WA_VWKMPO_STR-KMNR sy-vline 
WA_VWKMPO_STR-POSNR sy-vline 
WA_VWKMPO_STR-REFRANL sy-vline 
WA_VWKMPO_STR-REFUNIT sy-vline 
WA_VWKMPO_STR-AUSART sy-vline 
WA_VWKMPO_STR-RANL sy-vline 
WA_VWKMPO_STR-VZ sy-vline 
WA_VWKMPO_STR-BESTAEN sy-vline 
WA_VWKMPO_STR-BWKOMP sy-vline 
WA_VWKMPO_STR-BWFAKT sy-vline 
WA_VWKMPO_STR-MAXBW sy-vline 
WA_VWKMPO_STR-WAEHRUNG sy-vline 
WA_VWKMPO_STR-BWKONST sy-vline 
WA_VWKMPO_STR-REF6B sy-vline 
WA_VWKMPO_STR-KGV_FLAG sy-vline 
WA_VWKMPO_STR-SBWHR_FIX sy-vline 
WA_VWKMPO_STR-DEAL_NUMBER sy-vline 
WA_VWKMPO_STR-COMPANY_CODE sy-vline      INTO ld_text SEPARATED BY SPACE.

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