ABAP Select data from SAP table WSTI_IIKPF into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP WSTI_IIKPF 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_IIKPF. 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_IIKPF 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_IIKPF TYPE STANDARD TABLE OF WSTI_IIKPF,
      WA_WSTI_IIKPF TYPE WSTI_IIKPF,
      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_IIKPF> TYPE WSTI_IIKPF.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WSTI_IIKPF
*  INTO TABLE @DATA(IT_WSTI_IIKPF2).
*--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_IIKPF INDEX 1 INTO DATA(WA_WSTI_IIKPF2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WSTI_IIKPF>-MANDT = 1.
<WSTI_IIKPF>-IBLNR = 1.
<WSTI_IIKPF>-GJAHR = 1.
<WSTI_IIKPF>-VGART = 1.
<WSTI_IIKPF>-WERKS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WSTI_IIKPF-LGORT, sy-vline,
  WA_WSTI_IIKPF-SOBKZ, sy-vline,
  WA_WSTI_IIKPF-BLDAT, sy-vline,
  WA_WSTI_IIKPF-GIDAT, sy-vline,
  WA_WSTI_IIKPF-ZLDAT, sy-vline,
  WA_WSTI_IIKPF-BUDAT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WSTI_IIKPF 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_IIKPF 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_IIKPF INTO WA_WSTI_IIKPF.


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

*Conversion exit GJAHR, internal->external for field GJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_WSTI_IIKPF-GJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WSTI_IIKPF-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_WSTI_IIKPF_STR, 
MANDT TYPE STRING,
IBLNR TYPE STRING,
GJAHR TYPE STRING,
VGART TYPE STRING,
WERKS TYPE STRING,
LGORT TYPE STRING,
SOBKZ TYPE STRING,
BLDAT TYPE STRING,
GIDAT TYPE STRING,
ZLDAT TYPE STRING,
BUDAT TYPE STRING,
MONAT TYPE STRING,
USNAM TYPE STRING,
SPERR TYPE STRING,
ZSTAT TYPE STRING,
DSTAT TYPE STRING,
XBLNI TYPE STRING,
LSTAT TYPE STRING,
XBUFI TYPE STRING,
KEORD TYPE STRING,
ORDNG TYPE STRING,
INVNU TYPE STRING,
IBLTXT TYPE STRING,
INVART TYPE STRING,
LASTCHANGE_DATETIME TYPE STRING,
WSTI_BSTAT TYPE STRING,
SWERT TYPE STRING,
ABWEI TYPE STRING,
XLVOCA TYPE STRING,
NUMBER_OF_ITEMS TYPE STRING,
LGOBE TYPE STRING,
MATKL TYPE STRING,
WGBEZ TYPE STRING,
TEMP_NO TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WSTI_IIKPF_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_IIKPF_STR-MANDT sy-vline 
WA_WSTI_IIKPF_STR-IBLNR sy-vline 
WA_WSTI_IIKPF_STR-GJAHR sy-vline 
WA_WSTI_IIKPF_STR-VGART sy-vline 
WA_WSTI_IIKPF_STR-WERKS sy-vline 
WA_WSTI_IIKPF_STR-LGORT sy-vline 
WA_WSTI_IIKPF_STR-SOBKZ sy-vline 
WA_WSTI_IIKPF_STR-BLDAT sy-vline 
WA_WSTI_IIKPF_STR-GIDAT sy-vline 
WA_WSTI_IIKPF_STR-ZLDAT sy-vline 
WA_WSTI_IIKPF_STR-BUDAT sy-vline 
WA_WSTI_IIKPF_STR-MONAT sy-vline 
WA_WSTI_IIKPF_STR-USNAM sy-vline 
WA_WSTI_IIKPF_STR-SPERR sy-vline 
WA_WSTI_IIKPF_STR-ZSTAT sy-vline 
WA_WSTI_IIKPF_STR-DSTAT sy-vline 
WA_WSTI_IIKPF_STR-XBLNI sy-vline 
WA_WSTI_IIKPF_STR-LSTAT sy-vline 
WA_WSTI_IIKPF_STR-XBUFI sy-vline 
WA_WSTI_IIKPF_STR-KEORD sy-vline 
WA_WSTI_IIKPF_STR-ORDNG sy-vline 
WA_WSTI_IIKPF_STR-INVNU sy-vline 
WA_WSTI_IIKPF_STR-IBLTXT sy-vline 
WA_WSTI_IIKPF_STR-INVART sy-vline 
WA_WSTI_IIKPF_STR-LASTCHANGE_DATETIME sy-vline 
WA_WSTI_IIKPF_STR-WSTI_BSTAT sy-vline 
WA_WSTI_IIKPF_STR-SWERT sy-vline 
WA_WSTI_IIKPF_STR-ABWEI sy-vline 
WA_WSTI_IIKPF_STR-XLVOCA sy-vline 
WA_WSTI_IIKPF_STR-NUMBER_OF_ITEMS sy-vline 
WA_WSTI_IIKPF_STR-LGOBE sy-vline 
WA_WSTI_IIKPF_STR-MATKL sy-vline 
WA_WSTI_IIKPF_STR-WGBEZ sy-vline 
WA_WSTI_IIKPF_STR-TEMP_NO sy-vline      INTO ld_text SEPARATED BY SPACE.

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