ABAP Select data from SAP table RFGEN into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RFGEN
*  INTO TABLE @DATA(IT_RFGEN2).
*--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_RFGEN INDEX 1 INTO DATA(WA_RFGEN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RFGEN>-SRCCLIENT = 1.
<RFGEN>-SRCFORMKEY = 1.
<RFGEN>-SRCFORMCLASS = 1.
<RFGEN>-UPD_MODE = 1.
<RFGEN>-ACTUAL = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RFGEN-WMODE, sy-vline,
  WA_RFGEN-PART_OBJ, sy-vline,
  WA_RFGEN-EXIT_TYPE, sy-vline,
  WA_RFGEN-DECISION, sy-vline,
  WA_RFGEN-KENNZX, sy-vline,
  WA_RFGEN-OKCODE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RFGEN 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_RFGEN 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_RFGEN INTO WA_RFGEN.


*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 SPDEV, internal->external for field TDDEST
CALL FUNCTION 'CONVERSION_EXIT_SPDEV_OUTPUT'
  EXPORTING
    input =                      WA_RFGEN-TDDEST
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFGEN-TDDEST.
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_RFGEN_STR, 
SRCCLIENT TYPE STRING,
SRCFORMKEY TYPE STRING,
SRCFORMCLASS TYPE STRING,
UPD_MODE TYPE STRING,
ACTUAL TYPE STRING,
WMODE TYPE STRING,
PART_OBJ TYPE STRING,
EXIT_TYPE TYPE STRING,
DECISION TYPE STRING,
KENNZX TYPE STRING,
OKCODE TYPE STRING,
ROUTINE TYPE STRING,
TEXT TYPE STRING,
WORKAREA TYPE STRING,
DBTAB TYPE STRING,
DEVICE TYPE STRING,
ITAB TYPE STRING,
DOKU_LINE TYPE STRING,
MESSAGE TYPE STRING,
TRSTATUS TYPE STRING,
STATUS TYPE STRING,
TITLE TYPE STRING,
DATA TYPE STRING,
EX TYPE STRING,
DOC_TYPE TYPE STRING,
TMODE TYPE STRING,
DIALOG TYPE STRING,
DEBUG TYPE STRING,
FROM_DATE TYPE STRING,
TO_DATE TYPE STRING,
LOW TYPE STRING,
DESCRIPT TYPE STRING,
RDI TYPE STRING,
TDDEST TYPE STRING,
TAG TYPE STRING,
NO_ENTRY TYPE STRING,
OBJECT TYPE STRING,
LINE TYPE STRING,
HEADER TYPE STRING,
OPTION TYPE STRING,
NO_DIALOG TYPE STRING,
NO_CHANGE TYPE STRING,
NO_OTHER TYPE STRING,
MAXCOUNT TYPE STRING,
TRTEXTS TYPE STRING,
CUSTNSPACE TYPE STRING,
ADDRSTRING TYPE STRING,
FORMKEY_NO_VH TYPE STRING,
DATOUTPUT1 TYPE STRING,
DATOUTPUT2 TYPE STRING,
DESTCLIENT TYPE STRING,
OVERWRITE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RFGEN_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_RFGEN_STR-SRCCLIENT sy-vline 
WA_RFGEN_STR-SRCFORMKEY sy-vline 
WA_RFGEN_STR-SRCFORMCLASS sy-vline 
WA_RFGEN_STR-UPD_MODE sy-vline 
WA_RFGEN_STR-ACTUAL sy-vline 
WA_RFGEN_STR-WMODE sy-vline 
WA_RFGEN_STR-PART_OBJ sy-vline 
WA_RFGEN_STR-EXIT_TYPE sy-vline 
WA_RFGEN_STR-DECISION sy-vline 
WA_RFGEN_STR-KENNZX sy-vline 
WA_RFGEN_STR-OKCODE sy-vline 
WA_RFGEN_STR-ROUTINE sy-vline 
WA_RFGEN_STR-TEXT sy-vline 
WA_RFGEN_STR-WORKAREA sy-vline 
WA_RFGEN_STR-DBTAB sy-vline 
WA_RFGEN_STR-DEVICE sy-vline 
WA_RFGEN_STR-ITAB sy-vline 
WA_RFGEN_STR-DOKU_LINE sy-vline 
WA_RFGEN_STR-MESSAGE sy-vline 
WA_RFGEN_STR-TRSTATUS sy-vline 
WA_RFGEN_STR-STATUS sy-vline 
WA_RFGEN_STR-TITLE sy-vline 
WA_RFGEN_STR-DATA sy-vline 
WA_RFGEN_STR-EX sy-vline 
WA_RFGEN_STR-DOC_TYPE sy-vline 
WA_RFGEN_STR-TMODE sy-vline 
WA_RFGEN_STR-DIALOG sy-vline 
WA_RFGEN_STR-DEBUG sy-vline 
WA_RFGEN_STR-FROM_DATE sy-vline 
WA_RFGEN_STR-TO_DATE sy-vline 
WA_RFGEN_STR-LOW sy-vline 
WA_RFGEN_STR-DESCRIPT sy-vline 
WA_RFGEN_STR-RDI sy-vline 
WA_RFGEN_STR-TDDEST sy-vline 
WA_RFGEN_STR-TAG sy-vline 
WA_RFGEN_STR-NO_ENTRY sy-vline 
WA_RFGEN_STR-OBJECT sy-vline 
WA_RFGEN_STR-LINE sy-vline 
WA_RFGEN_STR-HEADER sy-vline 
WA_RFGEN_STR-OPTION sy-vline 
WA_RFGEN_STR-NO_DIALOG sy-vline 
WA_RFGEN_STR-NO_CHANGE sy-vline 
WA_RFGEN_STR-NO_OTHER sy-vline 
WA_RFGEN_STR-MAXCOUNT sy-vline 
WA_RFGEN_STR-TRTEXTS sy-vline 
WA_RFGEN_STR-CUSTNSPACE sy-vline 
WA_RFGEN_STR-ADDRSTRING sy-vline 
WA_RFGEN_STR-FORMKEY_NO_VH sy-vline 
WA_RFGEN_STR-DATOUTPUT1 sy-vline 
WA_RFGEN_STR-DATOUTPUT2 sy-vline 
WA_RFGEN_STR-DESTCLIENT sy-vline 
WA_RFGEN_STR-OVERWRITE sy-vline      INTO ld_text SEPARATED BY SPACE.

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