ABAP Select data from SAP table REIT_GUI_TAXDSITEM_L into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM REIT_GUI_TAXDSITEM_L
*  INTO TABLE @DATA(IT_REIT_GUI_TAXDSITEM_L2).
*--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_REIT_GUI_TAXDSITEM_L INDEX 1 INTO DATA(WA_REIT_GUI_TAXDSITEM_L2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<REIT_GUI_TAXDSITEM_L>-MANDT = 1.
<REIT_GUI_TAXDSITEM_L>-ITEMGUID = 1.
<REIT_GUI_TAXDSITEM_L>-DOCGUID = 1.
<REIT_GUI_TAXDSITEM_L>-ITEMNO = 1.
<REIT_GUI_TAXDSITEM_L>-VERSION = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_REIT_GUI_TAXDSITEM_L-STATUS, sy-vline,
  WA_REIT_GUI_TAXDSITEM_L-OPTRATE, sy-vline,
  WA_REIT_GUI_TAXDSITEM_L-OPTMETH, sy-vline,
  WA_REIT_GUI_TAXDSITEM_L-DIFFNONDEDTAXAMT, sy-vline,
  WA_REIT_GUI_TAXDSITEM_L-DIFFDEDTAXAMT, sy-vline,
  WA_REIT_GUI_TAXDSITEM_L-CURRENCY, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_REIT_GUI_TAXDSITEM_L 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_REIT_GUI_TAXDSITEM_L 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_REIT_GUI_TAXDSITEM_L INTO WA_REIT_GUI_TAXDSITEM_L.


*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_REIT_GUI_TAXDSITEM_L-OPTMETH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REIT_GUI_TAXDSITEM_L-OPTMETH.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field FISC_YEAR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_REIT_GUI_TAXDSITEM_L-FISC_YEAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REIT_GUI_TAXDSITEM_L-FISC_YEAR.
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_REIT_GUI_TAXDSITEM_L_STR, 
MANDT TYPE STRING,
ITEMGUID TYPE STRING,
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,
PROCESSID TYPE STRING,
FISC_YEAR TYPE STRING,
PSTNGPERIOD TYPE STRING,
PSTNGDATE TYPE STRING,
TITLE TYPE STRING,
REFDOCID TYPE STRING,
ITEMDOCID TYPE STRING,END OF T_EKKO_STR.
DATA: WA_REIT_GUI_TAXDSITEM_L_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_REIT_GUI_TAXDSITEM_L_STR-MANDT sy-vline 
WA_REIT_GUI_TAXDSITEM_L_STR-ITEMGUID sy-vline 
WA_REIT_GUI_TAXDSITEM_L_STR-DOCGUID sy-vline 
WA_REIT_GUI_TAXDSITEM_L_STR-ITEMNO sy-vline 
WA_REIT_GUI_TAXDSITEM_L_STR-VERSION sy-vline 
WA_REIT_GUI_TAXDSITEM_L_STR-STATUS sy-vline 
WA_REIT_GUI_TAXDSITEM_L_STR-OPTRATE sy-vline 
WA_REIT_GUI_TAXDSITEM_L_STR-OPTMETH sy-vline 
WA_REIT_GUI_TAXDSITEM_L_STR-DIFFNONDEDTAXAMT sy-vline 
WA_REIT_GUI_TAXDSITEM_L_STR-DIFFDEDTAXAMT sy-vline 
WA_REIT_GUI_TAXDSITEM_L_STR-CURRENCY sy-vline 
WA_REIT_GUI_TAXDSITEM_L_STR-NONDEDACCOUNT sy-vline 
WA_REIT_GUI_TAXDSITEM_L_STR-PROCESS sy-vline 
WA_REIT_GUI_TAXDSITEM_L_STR-PROCESSGUID sy-vline 
WA_REIT_GUI_TAXDSITEM_L_STR-REFDOCGUID sy-vline 
WA_REIT_GUI_TAXDSITEM_L_STR-REFITEMNO sy-vline 
WA_REIT_GUI_TAXDSITEM_L_STR-PROCESSID sy-vline 
WA_REIT_GUI_TAXDSITEM_L_STR-FISC_YEAR sy-vline 
WA_REIT_GUI_TAXDSITEM_L_STR-PSTNGPERIOD sy-vline 
WA_REIT_GUI_TAXDSITEM_L_STR-PSTNGDATE sy-vline 
WA_REIT_GUI_TAXDSITEM_L_STR-TITLE sy-vline 
WA_REIT_GUI_TAXDSITEM_L_STR-REFDOCID sy-vline 
WA_REIT_GUI_TAXDSITEM_L_STR-ITEMDOCID sy-vline      INTO ld_text SEPARATED BY SPACE.

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