ABAP Select data from SAP table GLTAX_DATA into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM GLTAX_DATA
*  INTO TABLE @DATA(IT_GLTAX_DATA2).
*--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_GLTAX_DATA INDEX 1 INTO DATA(WA_GLTAX_DATA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<GLTAX_DATA>-OLD_DOC_NUMBER = 1.
<GLTAX_DATA>-TAXPS = 1.
<GLTAX_DATA>-MWSKZ = 1.
<GLTAX_DATA>-TXJDP = 1.
<GLTAX_DATA>-KSCHL = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_GLTAX_DATA-TXJLV, sy-vline,
  WA_GLTAX_DATA-BUKRS, sy-vline,
  WA_GLTAX_DATA-HKONT, sy-vline,
  WA_GLTAX_DATA-KOART, sy-vline,
  WA_GLTAX_DATA-SHKZG, sy-vline,
  WA_GLTAX_DATA-KBETR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_GLTAX_DATA 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_GLTAX_DATA 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_GLTAX_DATA INTO WA_GLTAX_DATA.


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

*Conversion exit ALPHA, internal->external for field HKONT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_GLTAX_DATA-HKONT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GLTAX_DATA-HKONT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AU132, internal->external for field HWBAS
CALL FUNCTION 'CONVERSION_EXIT_AU132_OUTPUT'
  EXPORTING
    input =                      WA_GLTAX_DATA-HWBAS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GLTAX_DATA-HWBAS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AU132, internal->external for field FWBAS
CALL FUNCTION 'CONVERSION_EXIT_AU132_OUTPUT'
  EXPORTING
    input =                      WA_GLTAX_DATA-FWBAS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GLTAX_DATA-FWBAS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AU132, internal->external for field HWSTE
CALL FUNCTION 'CONVERSION_EXIT_AU132_OUTPUT'
  EXPORTING
    input =                      WA_GLTAX_DATA-HWSTE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GLTAX_DATA-HWSTE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AU132, internal->external for field FWSTE
CALL FUNCTION 'CONVERSION_EXIT_AU132_OUTPUT'
  EXPORTING
    input =                      WA_GLTAX_DATA-FWSTE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GLTAX_DATA-FWSTE.
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_GLTAX_DATA_STR, 
OLD_DOC_NUMBER TYPE STRING,
TAXPS TYPE STRING,
MWSKZ TYPE STRING,
TXJDP TYPE STRING,
KSCHL TYPE STRING,
TXJLV TYPE STRING,
BUKRS TYPE STRING,
HKONT TYPE STRING,
KOART TYPE STRING,
SHKZG TYPE STRING,
KBETR TYPE STRING,
HWBAS TYPE STRING,
FWBAS TYPE STRING,
HWSTE TYPE STRING,
FWSTE TYPE STRING,
TXJCD TYPE STRING,
KNUMH TYPE STRING,
KTOSL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_GLTAX_DATA_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_GLTAX_DATA_STR-OLD_DOC_NUMBER sy-vline 
WA_GLTAX_DATA_STR-TAXPS sy-vline 
WA_GLTAX_DATA_STR-MWSKZ sy-vline 
WA_GLTAX_DATA_STR-TXJDP sy-vline 
WA_GLTAX_DATA_STR-KSCHL sy-vline 
WA_GLTAX_DATA_STR-TXJLV sy-vline 
WA_GLTAX_DATA_STR-BUKRS sy-vline 
WA_GLTAX_DATA_STR-HKONT sy-vline 
WA_GLTAX_DATA_STR-KOART sy-vline 
WA_GLTAX_DATA_STR-SHKZG sy-vline 
WA_GLTAX_DATA_STR-KBETR sy-vline 
WA_GLTAX_DATA_STR-HWBAS sy-vline 
WA_GLTAX_DATA_STR-FWBAS sy-vline 
WA_GLTAX_DATA_STR-HWSTE sy-vline 
WA_GLTAX_DATA_STR-FWSTE sy-vline 
WA_GLTAX_DATA_STR-TXJCD sy-vline 
WA_GLTAX_DATA_STR-KNUMH sy-vline 
WA_GLTAX_DATA_STR-KTOSL sy-vline      INTO ld_text SEPARATED BY SPACE.

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