ABAP Select data from SAP table REBFC_CLASSREG into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM REBFC_CLASSREG
*  INTO TABLE @DATA(IT_REBFC_CLASSREG2).
*--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_REBFC_CLASSREG INDEX 1 INTO DATA(WA_REBFC_CLASSREG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<REBFC_CLASSREG>-GENTYPE = 1.
<REBFC_CLASSREG>-GENPACKAGE = 1.
<REBFC_CLASSREG>-GENBUSNAME = 1.
<REBFC_CLASSREG>-GENBUSDESC = 1.
<REBFC_CLASSREG>-GENCLSNAME = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_REBFC_CLASSREG-GENPREFIX, sy-vline,
  WA_REBFC_CLASSREG-GENTEMPLATE, sy-vline,
  WA_REBFC_CLASSREG-OBJNAME, sy-vline,
  WA_REBFC_CLASSREG-OBJTEXTTAB, sy-vline,
  WA_REBFC_CLASSREG-OBJTEXTFLD, sy-vline,
  WA_REBFC_CLASSREG-OBJTEXTFLD2, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_REBFC_CLASSREG 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_REBFC_CLASSREG 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_REBFC_CLASSREG INTO WA_REBFC_CLASSREG.


*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_REBFC_CLASSREG_STR, 
GENTYPE TYPE STRING,
GENPACKAGE TYPE STRING,
GENBUSNAME TYPE STRING,
GENBUSDESC TYPE STRING,
GENCLSNAME TYPE STRING,
GENPREFIX TYPE STRING,
GENTEMPLATE TYPE STRING,
OBJNAME TYPE STRING,
OBJTEXTTAB TYPE STRING,
OBJTEXTFLD TYPE STRING,
OBJTEXTFLD2 TYPE STRING,
OBJTEXTFLD3 TYPE STRING,
BUFKEYFLDS TYPE STRING,
FLDINTRENO TYPE STRING,
FLDOBJNR TYPE STRING,
FLDIMKEY TYPE STRING,
FLDGUID TYPE STRING,
AUTHOBJ TYPE STRING,
ENQUOBJ TYPE STRING,
AUTHOR TYPE STRING,
RERF TYPE STRING,
DERF TYPE STRING,
TERF TYPE STRING,
REHER TYPE STRING,
RBEAR TYPE STRING,
DBEAR TYPE STRING,
TBEAR TYPE STRING,
RBHER TYPE STRING,
GENLOCK TYPE STRING,END OF T_EKKO_STR.
DATA: WA_REBFC_CLASSREG_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_REBFC_CLASSREG_STR-GENTYPE sy-vline 
WA_REBFC_CLASSREG_STR-GENPACKAGE sy-vline 
WA_REBFC_CLASSREG_STR-GENBUSNAME sy-vline 
WA_REBFC_CLASSREG_STR-GENBUSDESC sy-vline 
WA_REBFC_CLASSREG_STR-GENCLSNAME sy-vline 
WA_REBFC_CLASSREG_STR-GENPREFIX sy-vline 
WA_REBFC_CLASSREG_STR-GENTEMPLATE sy-vline 
WA_REBFC_CLASSREG_STR-OBJNAME sy-vline 
WA_REBFC_CLASSREG_STR-OBJTEXTTAB sy-vline 
WA_REBFC_CLASSREG_STR-OBJTEXTFLD sy-vline 
WA_REBFC_CLASSREG_STR-OBJTEXTFLD2 sy-vline 
WA_REBFC_CLASSREG_STR-OBJTEXTFLD3 sy-vline 
WA_REBFC_CLASSREG_STR-BUFKEYFLDS sy-vline 
WA_REBFC_CLASSREG_STR-FLDINTRENO sy-vline 
WA_REBFC_CLASSREG_STR-FLDOBJNR sy-vline 
WA_REBFC_CLASSREG_STR-FLDIMKEY sy-vline 
WA_REBFC_CLASSREG_STR-FLDGUID sy-vline 
WA_REBFC_CLASSREG_STR-AUTHOBJ sy-vline 
WA_REBFC_CLASSREG_STR-ENQUOBJ sy-vline 
WA_REBFC_CLASSREG_STR-AUTHOR sy-vline 
WA_REBFC_CLASSREG_STR-RERF sy-vline 
WA_REBFC_CLASSREG_STR-DERF sy-vline 
WA_REBFC_CLASSREG_STR-TERF sy-vline 
WA_REBFC_CLASSREG_STR-REHER sy-vline 
WA_REBFC_CLASSREG_STR-RBEAR sy-vline 
WA_REBFC_CLASSREG_STR-DBEAR sy-vline 
WA_REBFC_CLASSREG_STR-TBEAR sy-vline 
WA_REBFC_CLASSREG_STR-RBHER sy-vline 
WA_REBFC_CLASSREG_STR-GENLOCK sy-vline      INTO ld_text SEPARATED BY SPACE.

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