ABAP Select data from SAP table RNF25 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RNF25 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 RNF25. 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 RNF25 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_RNF25 TYPE STANDARD TABLE OF RNF25,
      WA_RNF25 TYPE RNF25,
      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: <RNF25> TYPE RNF25.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RNF25.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RNF25
  INTO TABLE IT_RNF25.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNF25
*  INTO TABLE @DATA(IT_RNF252).
*--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_RNF25 INDEX 1 INTO DATA(WA_RNF252).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RNF25 ASSIGNING <RNF25>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNF25>-VBELN = 1.
<RNF25>-POSNR = 1.
<RNF25>-KSCHL = 1.
<RNF25>-KWERT = 1.
<RNF25>-KBETR = 1.

ENDLOOP.

LOOP AT IT_RNF25 INTO WA_RNF25.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNF25-KAWRT, sy-vline,
  WA_RNF25-VTEXT, sy-vline,
  WA_RNF25-DRUKZ, sy-vline,
  WA_RNF25-KOAID, sy-vline,
  WA_RNF25-KVSL1, sy-vline,
  WA_RNF25-KSTAT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNF25 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_RNF25 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_RNF25 INTO WA_RNF25.


*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 VBELN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF25-VBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF25-VBELN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KOTYP
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF25-KOTYP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF25-KOTYP.
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_RNF25_STR, 
VBELN TYPE STRING,
POSNR TYPE STRING,
KSCHL TYPE STRING,
KWERT TYPE STRING,
KBETR TYPE STRING,
KAWRT TYPE STRING,
VTEXT TYPE STRING,
DRUKZ TYPE STRING,
KOAID TYPE STRING,
KVSL1 TYPE STRING,
KSTAT TYPE STRING,
REWTY TYPE STRING,
KOTYP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNF25_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_RNF25_STR-VBELN sy-vline 
WA_RNF25_STR-POSNR sy-vline 
WA_RNF25_STR-KSCHL sy-vline 
WA_RNF25_STR-KWERT sy-vline 
WA_RNF25_STR-KBETR sy-vline 
WA_RNF25_STR-KAWRT sy-vline 
WA_RNF25_STR-VTEXT sy-vline 
WA_RNF25_STR-DRUKZ sy-vline 
WA_RNF25_STR-KOAID sy-vline 
WA_RNF25_STR-KVSL1 sy-vline 
WA_RNF25_STR-KSTAT sy-vline 
WA_RNF25_STR-REWTY sy-vline 
WA_RNF25_STR-KOTYP sy-vline      INTO ld_text SEPARATED BY SPACE.

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