ABAP Select data from SAP table WSTN_VAR_IDX into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WSTN_VAR_IDX
*  INTO TABLE @DATA(IT_WSTN_VAR_IDX2).
*--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_WSTN_VAR_IDX INDEX 1 INTO DATA(WA_WSTN_VAR_IDX2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WSTN_VAR_IDX>-ATINNX = 1.
<WSTN_VAR_IDX>-ATSRTX = 1.
<WSTN_VAR_IDX>-ATZHLX = 1.
<WSTN_VAR_IDX>-ATWRTX = 1.
<WSTN_VAR_IDX>-ATFLVX = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WSTN_VAR_IDX-ATINNY, sy-vline,
  WA_WSTN_VAR_IDX-ATZHLY, sy-vline,
  WA_WSTN_VAR_IDX-ATWRTY, sy-vline,
  WA_WSTN_VAR_IDX-ATFLVY, sy-vline,
  WA_WSTN_VAR_IDX-VARNR, sy-vline,
  WA_WSTN_VAR_IDX-CUOBJ, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WSTN_VAR_IDX 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_WSTN_VAR_IDX 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_WSTN_VAR_IDX INTO WA_WSTN_VAR_IDX.


*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 ATINN, internal->external for field ATINNX
CALL FUNCTION 'CONVERSION_EXIT_ATINN_OUTPUT'
  EXPORTING
    input =                      WA_WSTN_VAR_IDX-ATINNX
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WSTN_VAR_IDX-ATINNX.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ATINN, internal->external for field ATINNY
CALL FUNCTION 'CONVERSION_EXIT_ATINN_OUTPUT'
  EXPORTING
    input =                      WA_WSTN_VAR_IDX-ATINNY
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WSTN_VAR_IDX-ATINNY.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field VARNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_WSTN_VAR_IDX-VARNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WSTN_VAR_IDX-VARNR.
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_WSTN_VAR_IDX_STR, 
ATINNX TYPE STRING,
ATSRTX TYPE STRING,
ATZHLX TYPE STRING,
ATWRTX TYPE STRING,
ATFLVX TYPE STRING,
ATINNY TYPE STRING,
ATZHLY TYPE STRING,
ATWRTY TYPE STRING,
ATFLVY TYPE STRING,
VARNR TYPE STRING,
CUOBJ TYPE STRING,
LVORM TYPE STRING,
LOCKED TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WSTN_VAR_IDX_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_WSTN_VAR_IDX_STR-ATINNX sy-vline 
WA_WSTN_VAR_IDX_STR-ATSRTX sy-vline 
WA_WSTN_VAR_IDX_STR-ATZHLX sy-vline 
WA_WSTN_VAR_IDX_STR-ATWRTX sy-vline 
WA_WSTN_VAR_IDX_STR-ATFLVX sy-vline 
WA_WSTN_VAR_IDX_STR-ATINNY sy-vline 
WA_WSTN_VAR_IDX_STR-ATZHLY sy-vline 
WA_WSTN_VAR_IDX_STR-ATWRTY sy-vline 
WA_WSTN_VAR_IDX_STR-ATFLVY sy-vline 
WA_WSTN_VAR_IDX_STR-VARNR sy-vline 
WA_WSTN_VAR_IDX_STR-CUOBJ sy-vline 
WA_WSTN_VAR_IDX_STR-LVORM sy-vline 
WA_WSTN_VAR_IDX_STR-LOCKED sy-vline      INTO ld_text SEPARATED BY SPACE.

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