ABAP Select data from SAP table VDFKK_VT_ST into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VDFKK_VT_ST
*  INTO TABLE @DATA(IT_VDFKK_VT_ST2).
*--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_VDFKK_VT_ST INDEX 1 INTO DATA(WA_VDFKK_VT_ST2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VDFKK_VT_ST>-MANDT = 1.
<VDFKK_VT_ST>-VTKEY = 1.
<VDFKK_VT_ST>-VTPOS = 1.
<VDFKK_VT_ST>-SERVICE_TYPE = 1.
<VDFKK_VT_ST>-ERDAT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VDFKK_VT_ST-ERTIM, sy-vline,
  WA_VDFKK_VT_ST-ERNAM, sy-vline,
  WA_VDFKK_VT_ST-AEDAT, sy-vline,
  WA_VDFKK_VT_ST-AETIM, sy-vline,
  WA_VDFKK_VT_ST-AENAM, sy-vline,
  WA_VDFKK_VT_ST-KZ, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VDFKK_VT_ST 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_VDFKK_VT_ST 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_VDFKK_VT_ST INTO WA_VDFKK_VT_ST.


*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 VTKEY
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VDFKK_VT_ST-VTKEY
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VDFKK_VT_ST-VTKEY.
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_VDFKK_VT_ST_STR, 
MANDT TYPE STRING,
VTKEY TYPE STRING,
VTPOS TYPE STRING,
SERVICE_TYPE TYPE STRING,
ERDAT TYPE STRING,
ERTIM TYPE STRING,
ERNAM TYPE STRING,
AEDAT TYPE STRING,
AETIM TYPE STRING,
AENAM TYPE STRING,
KZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VDFKK_VT_ST_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_VDFKK_VT_ST_STR-MANDT sy-vline 
WA_VDFKK_VT_ST_STR-VTKEY sy-vline 
WA_VDFKK_VT_ST_STR-VTPOS sy-vline 
WA_VDFKK_VT_ST_STR-SERVICE_TYPE sy-vline 
WA_VDFKK_VT_ST_STR-ERDAT sy-vline 
WA_VDFKK_VT_ST_STR-ERTIM sy-vline 
WA_VDFKK_VT_ST_STR-ERNAM sy-vline 
WA_VDFKK_VT_ST_STR-AEDAT sy-vline 
WA_VDFKK_VT_ST_STR-AETIM sy-vline 
WA_VDFKK_VT_ST_STR-AENAM sy-vline 
WA_VDFKK_VT_ST_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.