ABAP Select data from SAP table RCLAS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RCLAS
*  INTO TABLE @DATA(IT_RCLAS2).
*--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_RCLAS INDEX 1 INTO DATA(WA_RCLAS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RCLAS>-CLASNAME = 1.
<RCLAS>-LITLID = 1.
<RCLAS>-CREFME = 1.
<RCLAS>-CREFSUPER = 1.
<RCLAS>-INHERITLEV = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RCLAS-PUBSTAMP, sy-vline,
  WA_RCLAS-PRVSTAMP, sy-vline,
  WA_RCLAS-VTABPUBIND, sy-vline,
  WA_RCLAS-VTABPPAIND, sy-vline,
  WA_RCLAS-VTABPRTIND, sy-vline,
  WA_RCLAS-VTABPRVIND, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RCLAS 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_RCLAS 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_RCLAS INTO WA_RCLAS.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_RCLAS_STR, 
CLASNAME TYPE STRING,
LITLID TYPE STRING,
CREFME TYPE STRING,
CREFSUPER TYPE STRING,
INHERITLEV TYPE STRING,
PUBSTAMP TYPE STRING,
PRVSTAMP TYPE STRING,
VTABPUBIND TYPE STRING,
VTABPPAIND TYPE STRING,
VTABPRTIND TYPE STRING,
VTABPRVIND TYPE STRING,
VTABSEGIND TYPE STRING,
INTIRUDI TYPE STRING,
INTILEN TYPE STRING,
CLSATTRXTP TYPE STRING,
CLSCNSTXTP TYPE STRING,
INSTXTYP TYPE STRING,
INSTMEXTYP TYPE STRING,
PUBOFFS TYPE STRING,
EVTDESCOFF TYPE STRING,
EVTDESCEND TYPE STRING,
EVTIPUBCNT TYPE STRING,
EVTIPRVCNT TYPE STRING,
EVTCPUBCNT TYPE STRING,
EVTCPRVCNT TYPE STRING,
CLFRID TYPE STRING,
CLFRNO TYPE STRING,
DSTRFUNCID TYPE STRING,
DSTRARGOFF TYPE STRING,
LOCALCLASS TYPE STRING,
CONSTR TYPE STRING,
CLCONSTR TYPE STRING,
CLDESTR TYPE STRING,
DESTR TYPE STRING,
DESTISPUB TYPE STRING,
DESTENDMOD TYPE STRING,
ABSTRACT TYPE STRING,
FINAL TYPE STRING,
CREATEPROT TYPE STRING,
CREATEPRIV TYPE STRING,
ISFORTESTING TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RCLAS_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_RCLAS_STR-CLASNAME sy-vline 
WA_RCLAS_STR-LITLID sy-vline 
WA_RCLAS_STR-CREFME sy-vline 
WA_RCLAS_STR-CREFSUPER sy-vline 
WA_RCLAS_STR-INHERITLEV sy-vline 
WA_RCLAS_STR-PUBSTAMP sy-vline 
WA_RCLAS_STR-PRVSTAMP sy-vline 
WA_RCLAS_STR-VTABPUBIND sy-vline 
WA_RCLAS_STR-VTABPPAIND sy-vline 
WA_RCLAS_STR-VTABPRTIND sy-vline 
WA_RCLAS_STR-VTABPRVIND sy-vline 
WA_RCLAS_STR-VTABSEGIND sy-vline 
WA_RCLAS_STR-INTIRUDI sy-vline 
WA_RCLAS_STR-INTILEN sy-vline 
WA_RCLAS_STR-CLSATTRXTP sy-vline 
WA_RCLAS_STR-CLSCNSTXTP sy-vline 
WA_RCLAS_STR-INSTXTYP sy-vline 
WA_RCLAS_STR-INSTMEXTYP sy-vline 
WA_RCLAS_STR-PUBOFFS sy-vline 
WA_RCLAS_STR-EVTDESCOFF sy-vline 
WA_RCLAS_STR-EVTDESCEND sy-vline 
WA_RCLAS_STR-EVTIPUBCNT sy-vline 
WA_RCLAS_STR-EVTIPRVCNT sy-vline 
WA_RCLAS_STR-EVTCPUBCNT sy-vline 
WA_RCLAS_STR-EVTCPRVCNT sy-vline 
WA_RCLAS_STR-CLFRID sy-vline 
WA_RCLAS_STR-CLFRNO sy-vline 
WA_RCLAS_STR-DSTRFUNCID sy-vline 
WA_RCLAS_STR-DSTRARGOFF sy-vline 
WA_RCLAS_STR-LOCALCLASS sy-vline 
WA_RCLAS_STR-CONSTR sy-vline 
WA_RCLAS_STR-CLCONSTR sy-vline 
WA_RCLAS_STR-CLDESTR sy-vline 
WA_RCLAS_STR-DESTR sy-vline 
WA_RCLAS_STR-DESTISPUB sy-vline 
WA_RCLAS_STR-DESTENDMOD sy-vline 
WA_RCLAS_STR-ABSTRACT sy-vline 
WA_RCLAS_STR-FINAL sy-vline 
WA_RCLAS_STR-CREATEPROT sy-vline 
WA_RCLAS_STR-CREATEPRIV sy-vline 
WA_RCLAS_STR-ISFORTESTING sy-vline      INTO ld_text SEPARATED BY SPACE.

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