ABAP Select data from SAP table DFKKOPK_NDTAX into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DFKKOPK_NDTAX
*  INTO TABLE @DATA(IT_DFKKOPK_NDTAX2).
*--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_DFKKOPK_NDTAX INDEX 1 INTO DATA(WA_DFKKOPK_NDTAX2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DFKKOPK_NDTAX>-MANDT = 1.
<DFKKOPK_NDTAX>-OPBEL = 1.
<DFKKOPK_NDTAX>-OPUPK = 1.
<DFKKOPK_NDTAX>-POSNR = 1.
<DFKKOPK_NDTAX>-TXCNT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DFKKOPK_NDTAX-BUKRS, sy-vline,
  WA_DFKKOPK_NDTAX-WAERS, sy-vline,
  WA_DFKKOPK_NDTAX-SBASW, sy-vline,
  WA_DFKKOPK_NDTAX-SBASH, sy-vline,
  WA_DFKKOPK_NDTAX-BETRW, sy-vline,
  WA_DFKKOPK_NDTAX-BETRH, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DFKKOPK_NDTAX 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_DFKKOPK_NDTAX 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_DFKKOPK_NDTAX INTO WA_DFKKOPK_NDTAX.


*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 OPBEL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_DFKKOPK_NDTAX-OPBEL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DFKKOPK_NDTAX-OPBEL.
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_DFKKOPK_NDTAX_STR, 
MANDT TYPE STRING,
OPBEL TYPE STRING,
OPUPK TYPE STRING,
POSNR TYPE STRING,
TXCNT TYPE STRING,
BUKRS TYPE STRING,
WAERS TYPE STRING,
SBASW TYPE STRING,
SBASH TYPE STRING,
BETRW TYPE STRING,
BETRH TYPE STRING,
BETR2 TYPE STRING,
BETR3 TYPE STRING,
KTOSL TYPE STRING,
KSCHL TYPE STRING,
TXJCD TYPE STRING,
TXJCO TYPE STRING,
TXDAT TYPE STRING,
MWSKZ TYPE STRING,
STPRZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DFKKOPK_NDTAX_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_DFKKOPK_NDTAX_STR-MANDT sy-vline 
WA_DFKKOPK_NDTAX_STR-OPBEL sy-vline 
WA_DFKKOPK_NDTAX_STR-OPUPK sy-vline 
WA_DFKKOPK_NDTAX_STR-POSNR sy-vline 
WA_DFKKOPK_NDTAX_STR-TXCNT sy-vline 
WA_DFKKOPK_NDTAX_STR-BUKRS sy-vline 
WA_DFKKOPK_NDTAX_STR-WAERS sy-vline 
WA_DFKKOPK_NDTAX_STR-SBASW sy-vline 
WA_DFKKOPK_NDTAX_STR-SBASH sy-vline 
WA_DFKKOPK_NDTAX_STR-BETRW sy-vline 
WA_DFKKOPK_NDTAX_STR-BETRH sy-vline 
WA_DFKKOPK_NDTAX_STR-BETR2 sy-vline 
WA_DFKKOPK_NDTAX_STR-BETR3 sy-vline 
WA_DFKKOPK_NDTAX_STR-KTOSL sy-vline 
WA_DFKKOPK_NDTAX_STR-KSCHL sy-vline 
WA_DFKKOPK_NDTAX_STR-TXJCD sy-vline 
WA_DFKKOPK_NDTAX_STR-TXJCO sy-vline 
WA_DFKKOPK_NDTAX_STR-TXDAT sy-vline 
WA_DFKKOPK_NDTAX_STR-MWSKZ sy-vline 
WA_DFKKOPK_NDTAX_STR-STPRZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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