ABAP Select data from SAP table WVFI_ITEM into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WVFI_ITEM
*  INTO TABLE @DATA(IT_WVFI_ITEM2).
*--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_WVFI_ITEM INDEX 1 INTO DATA(WA_WVFI_ITEM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WVFI_ITEM>-MATNR = 1.
<WVFI_ITEM>-EAN11 = 1.
<WVFI_ITEM>-CHARG = 1.
<WVFI_ITEM>-BSTAR = 1.
<WVFI_ITEM>-LIFNR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WVFI_ITEM-KDAUF, sy-vline,
  WA_WVFI_ITEM-KDPOS, sy-vline,
  WA_WVFI_ITEM-ERFMG, sy-vline,
  WA_WVFI_ITEM-ERFME, sy-vline,
  WA_WVFI_ITEM-XNULL, sy-vline,
  WA_WVFI_ITEM-EXVKW, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WVFI_ITEM 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_WVFI_ITEM 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_WVFI_ITEM INTO WA_WVFI_ITEM.


*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 MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_WVFI_ITEM-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WVFI_ITEM-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit EAN11, internal->external for field EAN11
CALL FUNCTION 'CONVERSION_EXIT_EAN11_OUTPUT'
  EXPORTING
    input =                      WA_WVFI_ITEM-EAN11
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WVFI_ITEM-EAN11.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LIFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WVFI_ITEM-LIFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WVFI_ITEM-LIFNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KDAUF
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WVFI_ITEM-KDAUF
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WVFI_ITEM-KDAUF.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ALPHA, internal->external for field IBLNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WVFI_ITEM-IBLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WVFI_ITEM-IBLNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field GJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_WVFI_ITEM-GJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WVFI_ITEM-GJAHR.
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_WVFI_ITEM_STR, 
MATNR TYPE STRING,
EAN11 TYPE STRING,
CHARG TYPE STRING,
BSTAR TYPE STRING,
LIFNR TYPE STRING,
KDAUF TYPE STRING,
KDPOS TYPE STRING,
ERFMG TYPE STRING,
ERFME TYPE STRING,
XNULL TYPE STRING,
EXVKW TYPE STRING,
WAERS TYPE STRING,
PDC_DATE TYPE STRING,
PDC_TIME TYPE STRING,
IBLNR TYPE STRING,
GJAHR TYPE STRING,
ZEILI TYPE STRING,
ROW TYPE STRING,
ERROR TYPE STRING,
ITMADD TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WVFI_ITEM_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_WVFI_ITEM_STR-MATNR sy-vline 
WA_WVFI_ITEM_STR-EAN11 sy-vline 
WA_WVFI_ITEM_STR-CHARG sy-vline 
WA_WVFI_ITEM_STR-BSTAR sy-vline 
WA_WVFI_ITEM_STR-LIFNR sy-vline 
WA_WVFI_ITEM_STR-KDAUF sy-vline 
WA_WVFI_ITEM_STR-KDPOS sy-vline 
WA_WVFI_ITEM_STR-ERFMG sy-vline 
WA_WVFI_ITEM_STR-ERFME sy-vline 
WA_WVFI_ITEM_STR-XNULL sy-vline 
WA_WVFI_ITEM_STR-EXVKW sy-vline 
WA_WVFI_ITEM_STR-WAERS sy-vline 
WA_WVFI_ITEM_STR-PDC_DATE sy-vline 
WA_WVFI_ITEM_STR-PDC_TIME sy-vline 
WA_WVFI_ITEM_STR-IBLNR sy-vline 
WA_WVFI_ITEM_STR-GJAHR sy-vline 
WA_WVFI_ITEM_STR-ZEILI sy-vline 
WA_WVFI_ITEM_STR-ROW sy-vline 
WA_WVFI_ITEM_STR-ERROR sy-vline 
WA_WVFI_ITEM_STR-ITMADD sy-vline      INTO ld_text SEPARATED BY SPACE.

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