ABAP Select data from SAP table REIT_TC_DOC_ITEM_ASSIGN into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP REIT_TC_DOC_ITEM_ASSIGN 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_TC_DOC_ITEM_ASSIGN. 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_TC_DOC_ITEM_ASSIGN 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_TC_DOC_ITEM_ASSIGN TYPE STANDARD TABLE OF REIT_TC_DOC_ITEM_ASSIGN,
      WA_REIT_TC_DOC_ITEM_ASSIGN TYPE REIT_TC_DOC_ITEM_ASSIGN,
      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_TC_DOC_ITEM_ASSIGN> TYPE REIT_TC_DOC_ITEM_ASSIGN.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM REIT_TC_DOC_ITEM_ASSIGN
*  INTO TABLE @DATA(IT_REIT_TC_DOC_ITEM_ASSIGN2).
*--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_TC_DOC_ITEM_ASSIGN INDEX 1 INTO DATA(WA_REIT_TC_DOC_ITEM_ASSIGN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<REIT_TC_DOC_ITEM_ASSIGN>-DOCGUID = 1.
<REIT_TC_DOC_ITEM_ASSIGN>-ITEMNO = 1.
<REIT_TC_DOC_ITEM_ASSIGN>-TCOBJNR = 1.
<REIT_TC_DOC_ITEM_ASSIGN>-DATEOFSERVICE = 1.
<REIT_TC_DOC_ITEM_ASSIGN>-HASDIFFOPTRATE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_REIT_TC_DOC_ITEM_ASSIGN-DIFFOPTRATE, sy-vline,
  WA_REIT_TC_DOC_ITEM_ASSIGN-NOTAXCORR, sy-vline,
  WA_REIT_TC_DOC_ITEM_ASSIGN-AMTRANSTYPE, sy-vline,
  WA_REIT_TC_DOC_ITEM_ASSIGN-POREFDOCID, sy-vline,
  WA_REIT_TC_DOC_ITEM_ASSIGN-POREFITEMNO, sy-vline,
  WA_REIT_TC_DOC_ITEM_ASSIGN-TCBASEGUID, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_REIT_TC_DOC_ITEM_ASSIGN 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_TC_DOC_ITEM_ASSIGN 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_TC_DOC_ITEM_ASSIGN INTO WA_REIT_TC_DOC_ITEM_ASSIGN.


*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 TCNO
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_REIT_TC_DOC_ITEM_ASSIGN-TCNO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REIT_TC_DOC_ITEM_ASSIGN-TCNO.
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_TC_DOC_ITEM_ASSIGN_STR, 
DOCGUID TYPE STRING,
ITEMNO 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,
TCNO TYPE STRING,END OF T_EKKO_STR.
DATA: WA_REIT_TC_DOC_ITEM_ASSIGN_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_TC_DOC_ITEM_ASSIGN_STR-DOCGUID sy-vline 
WA_REIT_TC_DOC_ITEM_ASSIGN_STR-ITEMNO sy-vline 
WA_REIT_TC_DOC_ITEM_ASSIGN_STR-TCOBJNR sy-vline 
WA_REIT_TC_DOC_ITEM_ASSIGN_STR-DATEOFSERVICE sy-vline 
WA_REIT_TC_DOC_ITEM_ASSIGN_STR-HASDIFFOPTRATE sy-vline 
WA_REIT_TC_DOC_ITEM_ASSIGN_STR-DIFFOPTRATE sy-vline 
WA_REIT_TC_DOC_ITEM_ASSIGN_STR-NOTAXCORR sy-vline 
WA_REIT_TC_DOC_ITEM_ASSIGN_STR-AMTRANSTYPE sy-vline 
WA_REIT_TC_DOC_ITEM_ASSIGN_STR-POREFDOCID sy-vline 
WA_REIT_TC_DOC_ITEM_ASSIGN_STR-POREFITEMNO sy-vline 
WA_REIT_TC_DOC_ITEM_ASSIGN_STR-TCBASEGUID sy-vline 
WA_REIT_TC_DOC_ITEM_ASSIGN_STR-TCNO sy-vline      INTO ld_text SEPARATED BY SPACE.

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