ABAP Select data from SAP table VVIGWFLKG into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VVIGWFLKG
*  INTO TABLE @DATA(IT_VVIGWFLKG2).
*--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_VVIGWFLKG INDEX 1 INTO DATA(WA_VVIGWFLKG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VVIGWFLKG>-MANDT = 1.
<VVIGWFLKG>-INTRENO = 1.
<VVIGWFLKG>-FLAG = 1.
<VVIGWFLKG>-DGUELBIS = 1.
<VVIGWFLKG>-VERSION = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VVIGWFLKG-DGUELAB, sy-vline,
  WA_VVIGWFLKG-FEINH, sy-vline,
  WA_VVIGWFLKG-FLKGR, sy-vline,
  WA_VVIGWFLKG-ZUOMOD, sy-vline,
  WA_VVIGWFLKG-GFLKAP, sy-vline,
  WA_VVIGWFLKG-GKAPEH, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VVIGWFLKG 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_VVIGWFLKG 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_VVIGWFLKG INTO WA_VVIGWFLKG.


*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 CUNIT, internal->external for field FEINH
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_VVIGWFLKG-FEINH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VVIGWFLKG-FEINH.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field GKAPEH
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_VVIGWFLKG-GKAPEH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VVIGWFLKG-GKAPEH.
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_VVIGWFLKG_STR, 
MANDT TYPE STRING,
INTRENO TYPE STRING,
FLAG TYPE STRING,
DGUELBIS TYPE STRING,
VERSION TYPE STRING,
DGUELAB TYPE STRING,
FEINH TYPE STRING,
FLKGR TYPE STRING,
ZUOMOD TYPE STRING,
GFLKAP TYPE STRING,
GKAPEH TYPE STRING,
KZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VVIGWFLKG_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_VVIGWFLKG_STR-MANDT sy-vline 
WA_VVIGWFLKG_STR-INTRENO sy-vline 
WA_VVIGWFLKG_STR-FLAG sy-vline 
WA_VVIGWFLKG_STR-DGUELBIS sy-vline 
WA_VVIGWFLKG_STR-VERSION sy-vline 
WA_VVIGWFLKG_STR-DGUELAB sy-vline 
WA_VVIGWFLKG_STR-FEINH sy-vline 
WA_VVIGWFLKG_STR-FLKGR sy-vline 
WA_VVIGWFLKG_STR-ZUOMOD sy-vline 
WA_VVIGWFLKG_STR-GFLKAP sy-vline 
WA_VVIGWFLKG_STR-GKAPEH sy-vline 
WA_VVIGWFLKG_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.