ABAP Select data from SAP table VEWIK into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VEWIK
*  INTO TABLE @DATA(IT_VEWIK2).
*--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_VEWIK INDEX 1 INTO DATA(WA_VEWIK2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VEWIK>-MANDT = 1.
<VEWIK>-WGRUPPE = 1.
<VEWIK>-WNUMMER = 1.
<VEWIK>-WANDART = 1.
<VEWIK>-WTYP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VEWIK-WART, sy-vline,
  WA_VEWIK-WSPANN, sy-vline,
  WA_VEWIK-WSTROM, sy-vline,
  WA_VEWIK-WLEIST, sy-vline,
  WA_VEWIK-WLEIST_C, sy-vline,
  WA_VEWIK-WGKLASSE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VEWIK 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_VEWIK 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_VEWIK INTO WA_VEWIK.


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

*Conversion exit NVOLT, internal->external for field NOMINALVOLT
CALL FUNCTION 'CONVERSION_EXIT_NVOLT_OUTPUT'
  EXPORTING
    input =                      WA_VEWIK-NOMINALVOLT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VEWIK-NOMINALVOLT.
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_VEWIK_STR, 
MANDT TYPE STRING,
WGRUPPE TYPE STRING,
WNUMMER TYPE STRING,
WANDART TYPE STRING,
WTYP TYPE STRING,
WART TYPE STRING,
WSPANN TYPE STRING,
WSTROM TYPE STRING,
WLEIST TYPE STRING,
WLEIST_C TYPE STRING,
WGKLASSE TYPE STRING,
PRIMKENNZ TYPE STRING,
SECKENNZ TYPE STRING,
SUCHBEG TYPE STRING,
ERDAT TYPE STRING,
ERNAM TYPE STRING,
AEDAT TYPE STRING,
AENAM TYPE STRING,
NOMINALVOLT TYPE STRING,
KZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VEWIK_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_VEWIK_STR-MANDT sy-vline 
WA_VEWIK_STR-WGRUPPE sy-vline 
WA_VEWIK_STR-WNUMMER sy-vline 
WA_VEWIK_STR-WANDART sy-vline 
WA_VEWIK_STR-WTYP sy-vline 
WA_VEWIK_STR-WART sy-vline 
WA_VEWIK_STR-WSPANN sy-vline 
WA_VEWIK_STR-WSTROM sy-vline 
WA_VEWIK_STR-WLEIST sy-vline 
WA_VEWIK_STR-WLEIST_C sy-vline 
WA_VEWIK_STR-WGKLASSE sy-vline 
WA_VEWIK_STR-PRIMKENNZ sy-vline 
WA_VEWIK_STR-SECKENNZ sy-vline 
WA_VEWIK_STR-SUCHBEG sy-vline 
WA_VEWIK_STR-ERDAT sy-vline 
WA_VEWIK_STR-ERNAM sy-vline 
WA_VEWIK_STR-AEDAT sy-vline 
WA_VEWIK_STR-AENAM sy-vline 
WA_VEWIK_STR-NOMINALVOLT sy-vline 
WA_VEWIK_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.