ABAP Select data from SAP table RDUNN_ITEM into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RDUNN_ITEM
*  INTO TABLE @DATA(IT_RDUNN_ITEM2).
*--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_RDUNN_ITEM INDEX 1 INTO DATA(WA_RDUNN_ITEM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RDUNN_ITEM>-MANDT = 1.
<RDUNN_ITEM>-LAUFD = 1.
<RDUNN_ITEM>-LAUFI = 1.
<RDUNN_ITEM>-MAHNN = 1.
<RDUNN_ITEM>-BUKRS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RDUNN_ITEM-CPDKY, sy-vline,
  WA_RDUNN_ITEM-MABER, sy-vline,
  WA_RDUNN_ITEM-BBUKRS, sy-vline,
  WA_RDUNN_ITEM-RBELKPFD, sy-vline,
  WA_RDUNN_ITEM-GJAHR, sy-vline,
  WA_RDUNN_ITEM-POSNR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RDUNN_ITEM 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_RDUNN_ITEM 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_RDUNN_ITEM INTO WA_RDUNN_ITEM.


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

*Conversion exit GJAHR, internal->external for field GJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_RDUNN_ITEM-GJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RDUNN_ITEM-GJAHR.
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_RDUNN_ITEM_STR, 
MANDT TYPE STRING,
LAUFD TYPE STRING,
LAUFI TYPE STRING,
MAHNN TYPE STRING,
BUKRS TYPE STRING,
CPDKY TYPE STRING,
MABER TYPE STRING,
BBUKRS TYPE STRING,
RBELKPFD TYPE STRING,
GJAHR TYPE STRING,
POSNR TYPE STRING,
MANSP TYPE STRING,
MADAT TYPE STRING,
MAHNS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RDUNN_ITEM_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_RDUNN_ITEM_STR-MANDT sy-vline 
WA_RDUNN_ITEM_STR-LAUFD sy-vline 
WA_RDUNN_ITEM_STR-LAUFI sy-vline 
WA_RDUNN_ITEM_STR-MAHNN sy-vline 
WA_RDUNN_ITEM_STR-BUKRS sy-vline 
WA_RDUNN_ITEM_STR-CPDKY sy-vline 
WA_RDUNN_ITEM_STR-MABER sy-vline 
WA_RDUNN_ITEM_STR-BBUKRS sy-vline 
WA_RDUNN_ITEM_STR-RBELKPFD sy-vline 
WA_RDUNN_ITEM_STR-GJAHR sy-vline 
WA_RDUNN_ITEM_STR-POSNR sy-vline 
WA_RDUNN_ITEM_STR-MANSP sy-vline 
WA_RDUNN_ITEM_STR-MADAT sy-vline 
WA_RDUNN_ITEM_STR-MAHNS sy-vline      INTO ld_text SEPARATED BY SPACE.

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