ABAP Select data from SAP table VKKKTAXINFO into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VKKKTAXINFO
*  INTO TABLE @DATA(IT_VKKKTAXINFO2).
*--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_VKKKTAXINFO INDEX 1 INTO DATA(WA_VKKKTAXINFO2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VKKKTAXINFO>-INSTAXS = 1.
<VKKKTAXINFO>-TAXTYPE = 1.
<VKKKTAXINFO>-STRKZ = 1.
<VKKKTAXINFO>-STPRZ = 1.
<VKKKTAXINFO>-SBASH = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VKKKTAXINFO-SBASW, sy-vline,
  WA_VKKKTAXINFO-HWAER, sy-vline,
  WA_VKKKTAXINFO-TWAER, sy-vline,
  WA_VKKKTAXINFO-SBETH, sy-vline,
  WA_VKKKTAXINFO-SBETW, sy-vline,
  WA_VKKKTAXINFO-GPART, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VKKKTAXINFO 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_VKKKTAXINFO 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_VKKKTAXINFO INTO WA_VKKKTAXINFO.


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

*Conversion exit ALPHA, internal->external for field VTREF
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VKKKTAXINFO-VTREF
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VKKKTAXINFO-VTREF.
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_VKKKTAXINFO_STR, 
INSTAXS TYPE STRING,
TAXTYPE TYPE STRING,
STRKZ TYPE STRING,
STPRZ TYPE STRING,
SBASH TYPE STRING,
SBASW TYPE STRING,
HWAER TYPE STRING,
TWAER TYPE STRING,
SBETH TYPE STRING,
SBETW TYPE STRING,
GPART TYPE STRING,
VTREF TYPE STRING,
FAEDN TYPE STRING,
ABRZU TYPE STRING,
ABRZO TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VKKKTAXINFO_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_VKKKTAXINFO_STR-INSTAXS sy-vline 
WA_VKKKTAXINFO_STR-TAXTYPE sy-vline 
WA_VKKKTAXINFO_STR-STRKZ sy-vline 
WA_VKKKTAXINFO_STR-STPRZ sy-vline 
WA_VKKKTAXINFO_STR-SBASH sy-vline 
WA_VKKKTAXINFO_STR-SBASW sy-vline 
WA_VKKKTAXINFO_STR-HWAER sy-vline 
WA_VKKKTAXINFO_STR-TWAER sy-vline 
WA_VKKKTAXINFO_STR-SBETH sy-vline 
WA_VKKKTAXINFO_STR-SBETW sy-vline 
WA_VKKKTAXINFO_STR-GPART sy-vline 
WA_VKKKTAXINFO_STR-VTREF sy-vline 
WA_VKKKTAXINFO_STR-FAEDN sy-vline 
WA_VKKKTAXINFO_STR-ABRZU sy-vline 
WA_VKKKTAXINFO_STR-ABRZO sy-vline      INTO ld_text SEPARATED BY SPACE.

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