ABAP Select data from SAP table RCUD0 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RCUD0 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 RCUD0. 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 RCUD0 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_RCUD0 TYPE STANDARD TABLE OF RCUD0,
      WA_RCUD0 TYPE RCUD0,
      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: <RCUD0> TYPE RCUD0.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RCUD0.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RCUD0
  INTO TABLE IT_RCUD0.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RCUD0
*  INTO TABLE @DATA(IT_RCUD02).
*--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_RCUD0 INDEX 1 INTO DATA(WA_RCUD02).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RCUD0 ASSIGNING <RCUD0>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RCUD0>-ATNAM = 1.
<RCUD0>-ATBEZ = 1.
<RCUD0>-ATWRT = 1.
<RCUD0>-ATWTB = 1.
<RCUD0>-VORNR = 1.

ENDLOOP.

LOOP AT IT_RCUD0 INTO WA_RCUD0.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RCUD0-UVORN, sy-vline,
  WA_RCUD0-PLNFL, sy-vline,
  WA_RCUD0-FLGTEXT, sy-vline,
  WA_RCUD0-PSNFH, sy-vline,
  WA_RCUD0-FHMAR, sy-vline,
  WA_RCUD0-FHMNR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RCUD0 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_RCUD0 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_RCUD0 INTO WA_RCUD0.


*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 NUMCV, internal->external for field VORNR
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_RCUD0-VORNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCUD0-VORNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit NUMCV, internal->external for field UVORN
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_RCUD0-UVORN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCUD0-UVORN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PLNFL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RCUD0-PLNFL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCUD0-PLNFL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit FHMAR, internal->external for field FHMAR
CALL FUNCTION 'CONVERSION_EXIT_FHMAR_OUTPUT'
  EXPORTING
    input =                      WA_RCUD0-FHMAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCUD0-FHMAR.
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_RCUD0_STR, 
ATNAM TYPE STRING,
ATBEZ TYPE STRING,
ATWRT TYPE STRING,
ATWTB TYPE STRING,
VORNR TYPE STRING,
UVORN TYPE STRING,
PLNFL TYPE STRING,
FLGTEXT TYPE STRING,
PSNFH TYPE STRING,
FHMAR TYPE STRING,
FHMNR TYPE STRING,
LTXA1 TYPE STRING,
FHKTX TYPE STRING,
CLASS TYPE STRING,
KSCHL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RCUD0_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_RCUD0_STR-ATNAM sy-vline 
WA_RCUD0_STR-ATBEZ sy-vline 
WA_RCUD0_STR-ATWRT sy-vline 
WA_RCUD0_STR-ATWTB sy-vline 
WA_RCUD0_STR-VORNR sy-vline 
WA_RCUD0_STR-UVORN sy-vline 
WA_RCUD0_STR-PLNFL sy-vline 
WA_RCUD0_STR-FLGTEXT sy-vline 
WA_RCUD0_STR-PSNFH sy-vline 
WA_RCUD0_STR-FHMAR sy-vline 
WA_RCUD0_STR-FHMNR sy-vline 
WA_RCUD0_STR-LTXA1 sy-vline 
WA_RCUD0_STR-FHKTX sy-vline 
WA_RCUD0_STR-CLASS sy-vline 
WA_RCUD0_STR-KSCHL sy-vline      INTO ld_text SEPARATED BY SPACE.

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