ABAP Select data from SAP table VFKOM_STG 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 VFKOM_STG 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 VFKOM_STG. 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 VFKOM_STG 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_VFKOM_STG TYPE STANDARD TABLE OF VFKOM_STG,
      WA_VFKOM_STG TYPE VFKOM_STG,
      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: <VFKOM_STG> TYPE VFKOM_STG.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VFKOM_STG
*  INTO TABLE @DATA(IT_VFKOM_STG2).
*--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_VFKOM_STG INDEX 1 INTO DATA(WA_VFKOM_STG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VFKOM_STG>-VSART = 1.
<VFKOM_STG>-LAUFK = 1.
<VFKOM_STG>-TDLNR = 1.
<VFKOM_STG>-TDLNR_LND = 1.
<VFKOM_STG>-SDABW = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VFKOM_STG-SLAND1_A, sy-vline,
  WA_VFKOM_STG-SLAND1_Z, sy-vline,
  WA_VFKOM_STG-KNOTA, sy-vline,
  WA_VFKOM_STG-LAND1A, sy-vline,
  WA_VFKOM_STG-PSTLZA, sy-vline,
  WA_VFKOM_STG-LZONEA, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VFKOM_STG 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_VFKOM_STG 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_VFKOM_STG INTO WA_VFKOM_STG.


*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 TDLNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VFKOM_STG-TDLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VFKOM_STG-TDLNR.
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_VFKOM_STG_STR, 
VSART TYPE STRING,
LAUFK TYPE STRING,
TDLNR TYPE STRING,
TDLNR_LND TYPE STRING,
SDABW TYPE STRING,
SLAND1_A TYPE STRING,
SLAND1_Z TYPE STRING,
KNOTA TYPE STRING,
LAND1A TYPE STRING,
PSTLZA TYPE STRING,
LZONEA TYPE STRING,
REGIOA TYPE STRING,
TRFZNA TYPE STRING,
KNOTZ TYPE STRING,
LAND1Z TYPE STRING,
PSTLZZ TYPE STRING,
LZONEZ TYPE STRING,
REGIOZ TYPE STRING,
TRFZNZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VFKOM_STG_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_VFKOM_STG_STR-VSART sy-vline 
WA_VFKOM_STG_STR-LAUFK sy-vline 
WA_VFKOM_STG_STR-TDLNR sy-vline 
WA_VFKOM_STG_STR-TDLNR_LND sy-vline 
WA_VFKOM_STG_STR-SDABW sy-vline 
WA_VFKOM_STG_STR-SLAND1_A sy-vline 
WA_VFKOM_STG_STR-SLAND1_Z sy-vline 
WA_VFKOM_STG_STR-KNOTA sy-vline 
WA_VFKOM_STG_STR-LAND1A sy-vline 
WA_VFKOM_STG_STR-PSTLZA sy-vline 
WA_VFKOM_STG_STR-LZONEA sy-vline 
WA_VFKOM_STG_STR-REGIOA sy-vline 
WA_VFKOM_STG_STR-TRFZNA sy-vline 
WA_VFKOM_STG_STR-KNOTZ sy-vline 
WA_VFKOM_STG_STR-LAND1Z sy-vline 
WA_VFKOM_STG_STR-PSTLZZ sy-vline 
WA_VFKOM_STG_STR-LZONEZ sy-vline 
WA_VFKOM_STG_STR-REGIOZ sy-vline 
WA_VFKOM_STG_STR-TRFZNZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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