ABAP Select data from SAP table TXW_VIITTAXDSITEM into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TXW_VIITTAXDSITEM
*  INTO TABLE @DATA(IT_TXW_VIITTAXDSITEM2).
*--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_TXW_VIITTAXDSITEM INDEX 1 INTO DATA(WA_TXW_VIITTAXDSITEM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TXW_VIITTAXDSITEM>-MANDT = 1.
<TXW_VIITTAXDSITEM>-BUKRS = 1.
<TXW_VIITTAXDSITEM>-BELNR = 1.
<TXW_VIITTAXDSITEM>-REFITEMNO = 1.
<TXW_VIITTAXDSITEM>-REFDOCTYPE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TXW_VIITTAXDSITEM-REFDOCID, sy-vline,
  WA_TXW_VIITTAXDSITEM-VERSION, sy-vline,
  WA_TXW_VIITTAXDSITEM-STATUS, sy-vline,
  WA_TXW_VIITTAXDSITEM-OPTRATE, sy-vline,
  WA_TXW_VIITTAXDSITEM-OPTMETH, sy-vline,
  WA_TXW_VIITTAXDSITEM-DIFFNONDEDTAXAMT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TXW_VIITTAXDSITEM 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_TXW_VIITTAXDSITEM 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_TXW_VIITTAXDSITEM INTO WA_TXW_VIITTAXDSITEM.


*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 BELNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TXW_VIITTAXDSITEM-BELNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TXW_VIITTAXDSITEM-BELNR.
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_TXW_VIITTAXDSITEM_STR, 
MANDT TYPE STRING,
BUKRS TYPE STRING,
BELNR TYPE STRING,
REFITEMNO TYPE STRING,
REFDOCTYPE TYPE STRING,
REFDOCID TYPE STRING,
VERSION TYPE STRING,
STATUS TYPE STRING,
OPTRATE TYPE STRING,
OPTMETH TYPE STRING,
DIFFNONDEDTAXAMT TYPE STRING,
DIFFDEDTAXAMT TYPE STRING,
CURRENCY TYPE STRING,
NONDEDACCOUNT TYPE STRING,
DOCGUID TYPE STRING,
ITEMNO TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TXW_VIITTAXDSITEM_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_TXW_VIITTAXDSITEM_STR-MANDT sy-vline 
WA_TXW_VIITTAXDSITEM_STR-BUKRS sy-vline 
WA_TXW_VIITTAXDSITEM_STR-BELNR sy-vline 
WA_TXW_VIITTAXDSITEM_STR-REFITEMNO sy-vline 
WA_TXW_VIITTAXDSITEM_STR-REFDOCTYPE sy-vline 
WA_TXW_VIITTAXDSITEM_STR-REFDOCID sy-vline 
WA_TXW_VIITTAXDSITEM_STR-VERSION sy-vline 
WA_TXW_VIITTAXDSITEM_STR-STATUS sy-vline 
WA_TXW_VIITTAXDSITEM_STR-OPTRATE sy-vline 
WA_TXW_VIITTAXDSITEM_STR-OPTMETH sy-vline 
WA_TXW_VIITTAXDSITEM_STR-DIFFNONDEDTAXAMT sy-vline 
WA_TXW_VIITTAXDSITEM_STR-DIFFDEDTAXAMT sy-vline 
WA_TXW_VIITTAXDSITEM_STR-CURRENCY sy-vline 
WA_TXW_VIITTAXDSITEM_STR-NONDEDACCOUNT sy-vline 
WA_TXW_VIITTAXDSITEM_STR-DOCGUID sy-vline 
WA_TXW_VIITTAXDSITEM_STR-ITEMNO sy-vline      INTO ld_text SEPARATED BY SPACE.

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