ABAP Select data from SAP table WSTI_ITEM into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP WSTI_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 WSTI_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 WSTI_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_WSTI_ITEM TYPE STANDARD TABLE OF WSTI_ITEM,
      WA_WSTI_ITEM TYPE WSTI_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: <WSTI_ITEM> TYPE WSTI_ITEM.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WSTI_ITEM
*  INTO TABLE @DATA(IT_WSTI_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_WSTI_ITEM INDEX 1 INTO DATA(WA_WSTI_ITEM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WSTI_ITEM>-WROW = 1.
<WSTI_ITEM>-WXTAKE = 1.
<WSTI_ITEM>-WSTATUS = 1.
<WSTI_ITEM>-WXWART = 1.
<WSTI_ITEM>-WXADUP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WSTI_ITEM-WVFD_ERROR, sy-vline,
  WA_WSTI_ITEM-WMAKTX, sy-vline,
  WA_WSTI_ITEM-WWGBEZ, sy-vline,
  WA_WSTI_ITEM-VO_CHECK_DONE, sy-vline,
  WA_WSTI_ITEM-SMATNR_EXIST, sy-vline,
  WA_WSTI_ITEM-WXCHAR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WSTI_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_WSTI_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_WSTI_ITEM INTO WA_WSTI_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_WSTI_ITEM-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WSTI_ITEM-MATNR.
WRITE:/ 'New Value:', ld_input.

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

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

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

*Conversion exit ABPSP, internal->external for field PSPNR
CALL FUNCTION 'CONVERSION_EXIT_ABPSP_OUTPUT'
  EXPORTING
    input =                      WA_WSTI_ITEM-PSPNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WSTI_ITEM-PSPNR.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_WSTI_ITEM-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WSTI_ITEM-MEINS.
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_WSTI_ITEM_STR, 
WROW TYPE STRING,
WXTAKE TYPE STRING,
WSTATUS TYPE STRING,
WXWART TYPE STRING,
WXADUP TYPE STRING,
WVFD_ERROR TYPE STRING,
WMAKTX TYPE STRING,
WWGBEZ TYPE STRING,
VO_CHECK_DONE TYPE STRING,
SMATNR_EXIST TYPE STRING,
WXCHAR TYPE STRING,
BSTAR_SORT TYPE STRING,
BATCHES TYPE STRING,
MATNR TYPE STRING,
WERKS TYPE STRING,
LGORT TYPE STRING,
MATKL TYPE STRING,
BSTAR TYPE STRING,
MTART TYPE STRING,
KZILL TYPE STRING,
KZILQ TYPE STRING,
KZILS TYPE STRING,
LABST TYPE STRING,
INSME TYPE STRING,
SPEME TYPE STRING,
VKLAB TYPE STRING,
CHARG TYPE STRING,
LGPBE TYPE STRING,
LVORM TYPE STRING,
ABCIN TYPE STRING,
BWTAR TYPE STRING,
LIFNR TYPE STRING,
KUNNR TYPE STRING,
VBELN TYPE STRING,
POSNR TYPE STRING,
PSPNR TYPE STRING,
SOBKZ TYPE STRING,
KZVLL TYPE STRING,
KZVLQ TYPE STRING,
KZVLS TYPE STRING,
MAT_KEY TYPE STRING,
EAN11 TYPE STRING,
MEINS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WSTI_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_WSTI_ITEM_STR-WROW sy-vline 
WA_WSTI_ITEM_STR-WXTAKE sy-vline 
WA_WSTI_ITEM_STR-WSTATUS sy-vline 
WA_WSTI_ITEM_STR-WXWART sy-vline 
WA_WSTI_ITEM_STR-WXADUP sy-vline 
WA_WSTI_ITEM_STR-WVFD_ERROR sy-vline 
WA_WSTI_ITEM_STR-WMAKTX sy-vline 
WA_WSTI_ITEM_STR-WWGBEZ sy-vline 
WA_WSTI_ITEM_STR-VO_CHECK_DONE sy-vline 
WA_WSTI_ITEM_STR-SMATNR_EXIST sy-vline 
WA_WSTI_ITEM_STR-WXCHAR sy-vline 
WA_WSTI_ITEM_STR-BSTAR_SORT sy-vline 
WA_WSTI_ITEM_STR-BATCHES sy-vline 
WA_WSTI_ITEM_STR-MATNR sy-vline 
WA_WSTI_ITEM_STR-WERKS sy-vline 
WA_WSTI_ITEM_STR-LGORT sy-vline 
WA_WSTI_ITEM_STR-MATKL sy-vline 
WA_WSTI_ITEM_STR-BSTAR sy-vline 
WA_WSTI_ITEM_STR-MTART sy-vline 
WA_WSTI_ITEM_STR-KZILL sy-vline 
WA_WSTI_ITEM_STR-KZILQ sy-vline 
WA_WSTI_ITEM_STR-KZILS sy-vline 
WA_WSTI_ITEM_STR-LABST sy-vline 
WA_WSTI_ITEM_STR-INSME sy-vline 
WA_WSTI_ITEM_STR-SPEME sy-vline 
WA_WSTI_ITEM_STR-VKLAB sy-vline 
WA_WSTI_ITEM_STR-CHARG sy-vline 
WA_WSTI_ITEM_STR-LGPBE sy-vline 
WA_WSTI_ITEM_STR-LVORM sy-vline 
WA_WSTI_ITEM_STR-ABCIN sy-vline 
WA_WSTI_ITEM_STR-BWTAR sy-vline 
WA_WSTI_ITEM_STR-LIFNR sy-vline 
WA_WSTI_ITEM_STR-KUNNR sy-vline 
WA_WSTI_ITEM_STR-VBELN sy-vline 
WA_WSTI_ITEM_STR-POSNR sy-vline 
WA_WSTI_ITEM_STR-PSPNR sy-vline 
WA_WSTI_ITEM_STR-SOBKZ sy-vline 
WA_WSTI_ITEM_STR-KZVLL sy-vline 
WA_WSTI_ITEM_STR-KZVLQ sy-vline 
WA_WSTI_ITEM_STR-KZVLS sy-vline 
WA_WSTI_ITEM_STR-MAT_KEY sy-vline 
WA_WSTI_ITEM_STR-EAN11 sy-vline 
WA_WSTI_ITEM_STR-MEINS sy-vline      INTO ld_text SEPARATED BY SPACE.

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