ABAP Select data from SAP table RCUD2 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RCUD2 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 RCUD2. 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 RCUD2 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_RCUD2 TYPE STANDARD TABLE OF RCUD2,
      WA_RCUD2 TYPE RCUD2,
      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: <RCUD2> TYPE RCUD2.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RCUD2.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RCUD2
  INTO TABLE IT_RCUD2.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RCUD2
*  INTO TABLE @DATA(IT_RCUD22).
*--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_RCUD2 INDEX 1 INTO DATA(WA_RCUD22).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RCUD2 ASSIGNING <RCUD2>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RCUD2>-TABLE = 1.
<RCUD2>-VTTXT = 1.
<RCUD2>-VALUE = 1.
<RCUD2>-DATUM = 1.
<RCUD2>-DARW0 = 1.

ENDLOOP.

LOOP AT IT_RCUD2 INTO WA_RCUD2.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RCUD2-DARWT, sy-vline,
  WA_RCUD2-DAR0T, sy-vline,
  WA_RCUD2-DARZB, sy-vline,
  WA_RCUD2-DARZG, sy-vline,
  WA_RCUD2-DARMX, sy-vline,
  WA_RCUD2-DARSQ, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RCUD2 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_RCUD2 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_RCUD2 INTO WA_RCUD2.


*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 ISOLA, internal->external for field SPRAS
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_RCUD2-SPRAS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCUD2-SPRAS.
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_RCUD2_STR, 
TABLE TYPE STRING,
VTTXT TYPE STRING,
VALUE TYPE STRING,
DATUM TYPE STRING,
DARW0 TYPE STRING,
DARWT TYPE STRING,
DAR0T TYPE STRING,
DARZB TYPE STRING,
DARZG TYPE STRING,
DARMX TYPE STRING,
DARSQ TYPE STRING,
DARDC TYPE STRING,
DAR00 TYPE STRING,
SPRAS TYPE STRING,
VAL70 TYPE STRING,
LINNODSP TYPE STRING,
VTLIN TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RCUD2_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_RCUD2_STR-TABLE sy-vline 
WA_RCUD2_STR-VTTXT sy-vline 
WA_RCUD2_STR-VALUE sy-vline 
WA_RCUD2_STR-DATUM sy-vline 
WA_RCUD2_STR-DARW0 sy-vline 
WA_RCUD2_STR-DARWT sy-vline 
WA_RCUD2_STR-DAR0T sy-vline 
WA_RCUD2_STR-DARZB sy-vline 
WA_RCUD2_STR-DARZG sy-vline 
WA_RCUD2_STR-DARMX sy-vline 
WA_RCUD2_STR-DARSQ sy-vline 
WA_RCUD2_STR-DARDC sy-vline 
WA_RCUD2_STR-DAR00 sy-vline 
WA_RCUD2_STR-SPRAS sy-vline 
WA_RCUD2_STR-VAL70 sy-vline 
WA_RCUD2_STR-LINNODSP sy-vline 
WA_RCUD2_STR-VTLIN sy-vline      INTO ld_text SEPARATED BY SPACE.

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