ABAP Select data from SAP table VWKMKO into internal table

Get Example source ABAP code based on a different SAP table
  Get ABAP code

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VWKMKO
*  INTO TABLE @DATA(IT_VWKMKO2).
*--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_VWKMKO INDEX 1 INTO DATA(WA_VWKMKO2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VWKMKO>-MANDT = 1.
<VWKMKO>-KMNR = 1.
<VWKMKO>-DATUM = 1.
<VWKMKO>-STATUS = 1.
<VWKMKO>-KMART = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VWKMKO-HERK, sy-vline,
  WA_VWKMKO-KURZTEXT, sy-vline,
  WA_VWKMKO-XZUSATZ, sy-vline,
  WA_VWKMKO-BEWART1, sy-vline,
  WA_VWKMKO-BEWART2, sy-vline,
  WA_VWKMKO-BEWART3, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VWKMKO 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_VWKMKO 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_VWKMKO INTO WA_VWKMKO.


*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_VWKMKO-KMNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VWKMKO-KMNR.
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_VWKMKO_STR, 
MANDT TYPE STRING,
KMNR TYPE STRING,
DATUM TYPE STRING,
STATUS TYPE STRING,
KMART TYPE STRING,
HERK TYPE STRING,
KURZTEXT TYPE STRING,
XZUSATZ TYPE STRING,
BEWART1 TYPE STRING,
BEWART2 TYPE STRING,
BEWART3 TYPE STRING,
BEWART4 TYPE STRING,
BEWART5 TYPE STRING,
BEWART6 TYPE STRING,
BEWART7 TYPE STRING,
BEWART8 TYPE STRING,
BEWART9 TYPE STRING,
BEWART10 TYPE STRING,
BEWART11 TYPE STRING,
BEWART12 TYPE STRING,
BEWART13 TYPE STRING,
BEWART14 TYPE STRING,
BEWART15 TYPE STRING,
BEWART16 TYPE STRING,
RERF TYPE STRING,
DERF TYPE STRING,
TERF TYPE STRING,
REHER TYPE STRING,
RBEAR TYPE STRING,
DBEAR TYPE STRING,
TBEAR TYPE STRING,
RBHER TYPE STRING,
ZAEHLER TYPE STRING,
NENNER TYPE STRING,
KREAK TYPE STRING,
KURST TYPE STRING,
FLG_ALL_COND TYPE STRING,
BVNJA TYPE STRING,
WVNJA TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VWKMKO_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_VWKMKO_STR-MANDT sy-vline 
WA_VWKMKO_STR-KMNR sy-vline 
WA_VWKMKO_STR-DATUM sy-vline 
WA_VWKMKO_STR-STATUS sy-vline 
WA_VWKMKO_STR-KMART sy-vline 
WA_VWKMKO_STR-HERK sy-vline 
WA_VWKMKO_STR-KURZTEXT sy-vline 
WA_VWKMKO_STR-XZUSATZ sy-vline 
WA_VWKMKO_STR-BEWART1 sy-vline 
WA_VWKMKO_STR-BEWART2 sy-vline 
WA_VWKMKO_STR-BEWART3 sy-vline 
WA_VWKMKO_STR-BEWART4 sy-vline 
WA_VWKMKO_STR-BEWART5 sy-vline 
WA_VWKMKO_STR-BEWART6 sy-vline 
WA_VWKMKO_STR-BEWART7 sy-vline 
WA_VWKMKO_STR-BEWART8 sy-vline 
WA_VWKMKO_STR-BEWART9 sy-vline 
WA_VWKMKO_STR-BEWART10 sy-vline 
WA_VWKMKO_STR-BEWART11 sy-vline 
WA_VWKMKO_STR-BEWART12 sy-vline 
WA_VWKMKO_STR-BEWART13 sy-vline 
WA_VWKMKO_STR-BEWART14 sy-vline 
WA_VWKMKO_STR-BEWART15 sy-vline 
WA_VWKMKO_STR-BEWART16 sy-vline 
WA_VWKMKO_STR-RERF sy-vline 
WA_VWKMKO_STR-DERF sy-vline 
WA_VWKMKO_STR-TERF sy-vline 
WA_VWKMKO_STR-REHER sy-vline 
WA_VWKMKO_STR-RBEAR sy-vline 
WA_VWKMKO_STR-DBEAR sy-vline 
WA_VWKMKO_STR-TBEAR sy-vline 
WA_VWKMKO_STR-RBHER sy-vline 
WA_VWKMKO_STR-ZAEHLER sy-vline 
WA_VWKMKO_STR-NENNER sy-vline 
WA_VWKMKO_STR-KREAK sy-vline 
WA_VWKMKO_STR-KURST sy-vline 
WA_VWKMKO_STR-FLG_ALL_COND sy-vline 
WA_VWKMKO_STR-BVNJA sy-vline 
WA_VWKMKO_STR-WVNJA sy-vline      INTO ld_text SEPARATED BY SPACE.

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