ABAP Select data from SAP table VIITTAXDSITEM_TAB into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VIITTAXDSITEM_TAB
*  INTO TABLE @DATA(IT_VIITTAXDSITEM_TAB2).
*--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_VIITTAXDSITEM_TAB INDEX 1 INTO DATA(WA_VIITTAXDSITEM_TAB2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VIITTAXDSITEM_TAB>-DOCGUID = 1.
<VIITTAXDSITEM_TAB>-ITEMNO = 1.
<VIITTAXDSITEM_TAB>-VERSION = 1.
<VIITTAXDSITEM_TAB>-STATUS = 1.
<VIITTAXDSITEM_TAB>-OPTRATE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VIITTAXDSITEM_TAB-OPTMETH, sy-vline,
  WA_VIITTAXDSITEM_TAB-DIFFNONDEDTAXAMT, sy-vline,
  WA_VIITTAXDSITEM_TAB-DIFFDEDTAXAMT, sy-vline,
  WA_VIITTAXDSITEM_TAB-CURRENCY, sy-vline,
  WA_VIITTAXDSITEM_TAB-NONDEDACCOUNT, sy-vline,
  WA_VIITTAXDSITEM_TAB-PROCESS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VIITTAXDSITEM_TAB 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_VIITTAXDSITEM_TAB 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_VIITTAXDSITEM_TAB INTO WA_VIITTAXDSITEM_TAB.


*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 OPTMETH
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VIITTAXDSITEM_TAB-OPTMETH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VIITTAXDSITEM_TAB-OPTMETH.
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_VIITTAXDSITEM_TAB_STR, 
DOCGUID TYPE STRING,
ITEMNO 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,
PROCESS TYPE STRING,
PROCESSGUID TYPE STRING,
REFDOCGUID TYPE STRING,
REFITEMNO TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VIITTAXDSITEM_TAB_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_VIITTAXDSITEM_TAB_STR-DOCGUID sy-vline 
WA_VIITTAXDSITEM_TAB_STR-ITEMNO sy-vline 
WA_VIITTAXDSITEM_TAB_STR-VERSION sy-vline 
WA_VIITTAXDSITEM_TAB_STR-STATUS sy-vline 
WA_VIITTAXDSITEM_TAB_STR-OPTRATE sy-vline 
WA_VIITTAXDSITEM_TAB_STR-OPTMETH sy-vline 
WA_VIITTAXDSITEM_TAB_STR-DIFFNONDEDTAXAMT sy-vline 
WA_VIITTAXDSITEM_TAB_STR-DIFFDEDTAXAMT sy-vline 
WA_VIITTAXDSITEM_TAB_STR-CURRENCY sy-vline 
WA_VIITTAXDSITEM_TAB_STR-NONDEDACCOUNT sy-vline 
WA_VIITTAXDSITEM_TAB_STR-PROCESS sy-vline 
WA_VIITTAXDSITEM_TAB_STR-PROCESSGUID sy-vline 
WA_VIITTAXDSITEM_TAB_STR-REFDOCGUID sy-vline 
WA_VIITTAXDSITEM_TAB_STR-REFITEMNO sy-vline      INTO ld_text SEPARATED BY SPACE.

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