ABAP Select data from SAP table RGFKEY into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RGFKEY
*  INTO TABLE @DATA(IT_RGFKEY2).
*--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_RGFKEY INDEX 1 INTO DATA(WA_RGFKEY2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RGFKEY>-FRKART = 1.
<RGFKEY>-CARD = 1.
<RGFKEY>-CHECKTABLE = 1.
<RGFKEY>-FORTABLE = 1.
<RGFKEY>-FORKEY = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RGFKEY-CHECKFIELD, sy-vline,
  WA_RGFKEY-CHECKFLAG, sy-vline,
  WA_RGFKEY-DDTEXT, sy-vline,
  WA_RGFKEY-DOMNAME, sy-vline,
  WA_RGFKEY-PRIMPOS, sy-vline,
  WA_RGFKEY-CARDLEFT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RGFKEY 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_RGFKEY 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_RGFKEY INTO WA_RGFKEY.


*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_RGFKEY_STR, 
FRKART TYPE STRING,
CARD TYPE STRING,
CHECKTABLE TYPE STRING,
FORTABLE TYPE STRING,
FORKEY TYPE STRING,
CHECKFIELD TYPE STRING,
CHECKFLAG TYPE STRING,
DDTEXT TYPE STRING,
DOMNAME TYPE STRING,
PRIMPOS TYPE STRING,
CARDLEFT TYPE STRING,
D_FRKART TYPE STRING,
N_FRKART TYPE STRING,
K_FRKART TYPE STRING,
T_FRKART TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RGFKEY_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_RGFKEY_STR-FRKART sy-vline 
WA_RGFKEY_STR-CARD sy-vline 
WA_RGFKEY_STR-CHECKTABLE sy-vline 
WA_RGFKEY_STR-FORTABLE sy-vline 
WA_RGFKEY_STR-FORKEY sy-vline 
WA_RGFKEY_STR-CHECKFIELD sy-vline 
WA_RGFKEY_STR-CHECKFLAG sy-vline 
WA_RGFKEY_STR-DDTEXT sy-vline 
WA_RGFKEY_STR-DOMNAME sy-vline 
WA_RGFKEY_STR-PRIMPOS sy-vline 
WA_RGFKEY_STR-CARDLEFT sy-vline 
WA_RGFKEY_STR-D_FRKART sy-vline 
WA_RGFKEY_STR-N_FRKART sy-vline 
WA_RGFKEY_STR-K_FRKART sy-vline 
WA_RGFKEY_STR-T_FRKART sy-vline      INTO ld_text SEPARATED BY SPACE.

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