ABAP Select data from SAP table REIT_GUI_TAXDSBASE_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_TAXDSBASE_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_TAXDSBASE_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_TAXDSBASE_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_TAXDSBASE_L TYPE STANDARD TABLE OF REIT_GUI_TAXDSBASE_L,
      WA_REIT_GUI_TAXDSBASE_L TYPE REIT_GUI_TAXDSBASE_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_TAXDSBASE_L> TYPE REIT_GUI_TAXDSBASE_L.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM REIT_GUI_TAXDSBASE_L
*  INTO TABLE @DATA(IT_REIT_GUI_TAXDSBASE_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_TAXDSBASE_L INDEX 1 INTO DATA(WA_REIT_GUI_TAXDSBASE_L2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<REIT_GUI_TAXDSBASE_L>-MANDT = 1.
<REIT_GUI_TAXDSBASE_L>-DOCGUID = 1.
<REIT_GUI_TAXDSBASE_L>-ITEMNO = 1.
<REIT_GUI_TAXDSBASE_L>-REFDOCTYPE = 1.
<REIT_GUI_TAXDSBASE_L>-REFDOCID = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_REIT_GUI_TAXDSBASE_L-REFITEMNO, sy-vline,
  WA_REIT_GUI_TAXDSBASE_L-ACCSYSTEM, sy-vline,
  WA_REIT_GUI_TAXDSBASE_L-LOGSYSTEM, sy-vline,
  WA_REIT_GUI_TAXDSBASE_L-REVDOCID, sy-vline,
  WA_REIT_GUI_TAXDSBASE_L-STATUS, sy-vline,
  WA_REIT_GUI_TAXDSBASE_L-FISCALYEAR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_REIT_GUI_TAXDSBASE_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_TAXDSBASE_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_TAXDSBASE_L INTO WA_REIT_GUI_TAXDSBASE_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 LOGSYSTEM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_REIT_GUI_TAXDSBASE_L-LOGSYSTEM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REIT_GUI_TAXDSBASE_L-LOGSYSTEM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field FISCALYEAR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_REIT_GUI_TAXDSBASE_L-FISCALYEAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REIT_GUI_TAXDSBASE_L-FISCALYEAR.
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_TAXDSBASE_L_STR, 
MANDT TYPE STRING,
DOCGUID TYPE STRING,
ITEMNO TYPE STRING,
REFDOCTYPE TYPE STRING,
REFDOCID TYPE STRING,
REFITEMNO TYPE STRING,
ACCSYSTEM TYPE STRING,
LOGSYSTEM TYPE STRING,
REVDOCID TYPE STRING,
STATUS TYPE STRING,
FISCALYEAR TYPE STRING,
PSTNGPERIOD TYPE STRING,
PSTNGDATE TYPE STRING,
BUKRS TYPE STRING,
OBJNR TYPE STRING,
REFDATE TYPE STRING,
DCINDICATOR TYPE STRING,
COSTACCOUNT TYPE STRING,
TAXTYPE TYPE STRING,
TAXGROUP TYPE STRING,
TAXACCOUNT TYPE STRING,
OBJNROPTRATE TYPE STRING,
NETAMOUNT TYPE STRING,
TAXAMOUNT TYPE STRING,
DEDTAXAMT TYPE STRING,
NONDEDTAXAMT TYPE STRING,
CURRENCY TYPE STRING,
TCOBJNR TYPE STRING,
DATEOFSERVICE TYPE STRING,
HASDIFFOPTRATE TYPE STRING,
DIFFOPTRATE TYPE STRING,
NOTAXCORR TYPE STRING,
AMTRANSTYPE TYPE STRING,
POREFDOCID TYPE STRING,
POREFITEMNO TYPE STRING,
TCBASEGUID TYPE STRING,
EXTTAXCODE TYPE STRING,
TAXCOUNTRY TYPE STRING,
IDENT TYPE STRING,
ITEMTXT TYPE STRING,
TAXACCOUNTTXT TYPE STRING,
COSTACCOUNTTXT TYPE STRING,
BASEDOCID TYPE STRING,
IDENT_CN TYPE STRING,
TOTALCOSTAMT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_REIT_GUI_TAXDSBASE_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_TAXDSBASE_L_STR-MANDT sy-vline 
WA_REIT_GUI_TAXDSBASE_L_STR-DOCGUID sy-vline 
WA_REIT_GUI_TAXDSBASE_L_STR-ITEMNO sy-vline 
WA_REIT_GUI_TAXDSBASE_L_STR-REFDOCTYPE sy-vline 
WA_REIT_GUI_TAXDSBASE_L_STR-REFDOCID sy-vline 
WA_REIT_GUI_TAXDSBASE_L_STR-REFITEMNO sy-vline 
WA_REIT_GUI_TAXDSBASE_L_STR-ACCSYSTEM sy-vline 
WA_REIT_GUI_TAXDSBASE_L_STR-LOGSYSTEM sy-vline 
WA_REIT_GUI_TAXDSBASE_L_STR-REVDOCID sy-vline 
WA_REIT_GUI_TAXDSBASE_L_STR-STATUS sy-vline 
WA_REIT_GUI_TAXDSBASE_L_STR-FISCALYEAR sy-vline 
WA_REIT_GUI_TAXDSBASE_L_STR-PSTNGPERIOD sy-vline 
WA_REIT_GUI_TAXDSBASE_L_STR-PSTNGDATE sy-vline 
WA_REIT_GUI_TAXDSBASE_L_STR-BUKRS sy-vline 
WA_REIT_GUI_TAXDSBASE_L_STR-OBJNR sy-vline 
WA_REIT_GUI_TAXDSBASE_L_STR-REFDATE sy-vline 
WA_REIT_GUI_TAXDSBASE_L_STR-DCINDICATOR sy-vline 
WA_REIT_GUI_TAXDSBASE_L_STR-COSTACCOUNT sy-vline 
WA_REIT_GUI_TAXDSBASE_L_STR-TAXTYPE sy-vline 
WA_REIT_GUI_TAXDSBASE_L_STR-TAXGROUP sy-vline 
WA_REIT_GUI_TAXDSBASE_L_STR-TAXACCOUNT sy-vline 
WA_REIT_GUI_TAXDSBASE_L_STR-OBJNROPTRATE sy-vline 
WA_REIT_GUI_TAXDSBASE_L_STR-NETAMOUNT sy-vline 
WA_REIT_GUI_TAXDSBASE_L_STR-TAXAMOUNT sy-vline 
WA_REIT_GUI_TAXDSBASE_L_STR-DEDTAXAMT sy-vline 
WA_REIT_GUI_TAXDSBASE_L_STR-NONDEDTAXAMT sy-vline 
WA_REIT_GUI_TAXDSBASE_L_STR-CURRENCY sy-vline 
WA_REIT_GUI_TAXDSBASE_L_STR-TCOBJNR sy-vline 
WA_REIT_GUI_TAXDSBASE_L_STR-DATEOFSERVICE sy-vline 
WA_REIT_GUI_TAXDSBASE_L_STR-HASDIFFOPTRATE sy-vline 
WA_REIT_GUI_TAXDSBASE_L_STR-DIFFOPTRATE sy-vline 
WA_REIT_GUI_TAXDSBASE_L_STR-NOTAXCORR sy-vline 
WA_REIT_GUI_TAXDSBASE_L_STR-AMTRANSTYPE sy-vline 
WA_REIT_GUI_TAXDSBASE_L_STR-POREFDOCID sy-vline 
WA_REIT_GUI_TAXDSBASE_L_STR-POREFITEMNO sy-vline 
WA_REIT_GUI_TAXDSBASE_L_STR-TCBASEGUID sy-vline 
WA_REIT_GUI_TAXDSBASE_L_STR-EXTTAXCODE sy-vline 
WA_REIT_GUI_TAXDSBASE_L_STR-TAXCOUNTRY sy-vline 
WA_REIT_GUI_TAXDSBASE_L_STR-IDENT sy-vline 
WA_REIT_GUI_TAXDSBASE_L_STR-ITEMTXT sy-vline 
WA_REIT_GUI_TAXDSBASE_L_STR-TAXACCOUNTTXT sy-vline 
WA_REIT_GUI_TAXDSBASE_L_STR-COSTACCOUNTTXT sy-vline 
WA_REIT_GUI_TAXDSBASE_L_STR-BASEDOCID sy-vline 
WA_REIT_GUI_TAXDSBASE_L_STR-IDENT_CN sy-vline 
WA_REIT_GUI_TAXDSBASE_L_STR-TOTALCOSTAMT sy-vline      INTO ld_text SEPARATED BY SPACE.

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