ABAP Select data from SAP table RNF23 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RNF23 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 RNF23. 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 RNF23 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_RNF23 TYPE STANDARD TABLE OF RNF23,
      WA_RNF23 TYPE RNF23,
      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: <RNF23> TYPE RNF23.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RNF23.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RNF23
  INTO TABLE IT_RNF23.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNF23
*  INTO TABLE @DATA(IT_RNF232).
*--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_RNF23 INDEX 1 INTO DATA(WA_RNF232).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RNF23 ASSIGNING <RNF23>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNF23>-EINRI = 1.
<RNF23>-FALN1 = 1.
<RNF23>-LFDNR = 1.
<RNF23>-FALN2 = 1.
<RNF23>-GBDAT = 1.

ENDLOOP.

LOOP AT IT_RNF23 INTO WA_RNF23.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNF23-GBTIM, sy-vline,
  WA_RNF23-GSCHL, sy-vline,
  WA_RNF23-GBGEW, sy-vline,
  WA_RNF23-GWEIN, sy-vline,
  WA_RNF23-GBGRO, sy-vline,
  WA_RNF23-GREIN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNF23 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_RNF23 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_RNF23 INTO WA_RNF23.


*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 ALPHA, internal->external for field EINRI
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF23-EINRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF23-EINRI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field FALN1
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF23-FALN1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF23-FALN1.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field FALN2
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF23-FALN2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF23-FALN2.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field GWEIN
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_RNF23-GWEIN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF23-GWEIN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field GREIN
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_RNF23-GREIN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF23-GREIN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field BWERT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF23-BWERT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF23-BWERT.
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_RNF23_STR, 
EINRI TYPE STRING,
FALN1 TYPE STRING,
LFDNR TYPE STRING,
FALN2 TYPE STRING,
GBDAT TYPE STRING,
GBTIM TYPE STRING,
GSCHL TYPE STRING,
GBGEW TYPE STRING,
GWEIN TYPE STRING,
GBGRO TYPE STRING,
GREIN TYPE STRING,
KZTXT TYPE STRING,
LGTXT TYPE STRING,
KZTOT TYPE STRING,
MODUS TYPE STRING,
BWERT TYPE STRING,
MEHRL TYPE STRING,
VNAME TYPE STRING,
STORN TYPE STRING,
STUSR TYPE STRING,
STDAT TYPE STRING,
ERDAT TYPE STRING,
PNNAME TYPE STRING,
PVNAME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNF23_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_RNF23_STR-EINRI sy-vline 
WA_RNF23_STR-FALN1 sy-vline 
WA_RNF23_STR-LFDNR sy-vline 
WA_RNF23_STR-FALN2 sy-vline 
WA_RNF23_STR-GBDAT sy-vline 
WA_RNF23_STR-GBTIM sy-vline 
WA_RNF23_STR-GSCHL sy-vline 
WA_RNF23_STR-GBGEW sy-vline 
WA_RNF23_STR-GWEIN sy-vline 
WA_RNF23_STR-GBGRO sy-vline 
WA_RNF23_STR-GREIN sy-vline 
WA_RNF23_STR-KZTXT sy-vline 
WA_RNF23_STR-LGTXT sy-vline 
WA_RNF23_STR-KZTOT sy-vline 
WA_RNF23_STR-MODUS sy-vline 
WA_RNF23_STR-BWERT sy-vline 
WA_RNF23_STR-MEHRL sy-vline 
WA_RNF23_STR-VNAME sy-vline 
WA_RNF23_STR-STORN sy-vline 
WA_RNF23_STR-STUSR sy-vline 
WA_RNF23_STR-STDAT sy-vline 
WA_RNF23_STR-ERDAT sy-vline 
WA_RNF23_STR-PNNAME sy-vline 
WA_RNF23_STR-PVNAME sy-vline      INTO ld_text SEPARATED BY SPACE.

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