ABAP Select data from SAP table RNFN110 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RNFN110 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 RNFN110. 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 RNFN110 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_RNFN110 TYPE STANDARD TABLE OF RNFN110,
      WA_RNFN110 TYPE RNFN110,
      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: <RNFN110> TYPE RNFN110.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RNFN110.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RNFN110
  INTO TABLE IT_RNFN110.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNFN110
*  INTO TABLE @DATA(IT_RNFN1102).
*--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_RNFN110 INDEX 1 INTO DATA(WA_RNFN1102).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RNFN110 ASSIGNING <RNFN110>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNFN110>-MANDT = 1.
<RNFN110>-PATNR = 1.
<RNFN110>-RSFNR = 1.
<RNFN110>-LFDNR = 1.
<RNFN110>-KZTXT = 1.

ENDLOOP.

LOOP AT IT_RNFN110 INTO WA_RNFN110.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNFN110-LGTXT, sy-vline,
  WA_RNFN110-LOEKZ, sy-vline,
  WA_RNFN110-LOUSR, sy-vline,
  WA_RNFN110-LODAT, sy-vline,
  WA_RNFN110-ERUSR, sy-vline,
  WA_RNFN110-ERDAT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNFN110 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_RNFN110 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_RNFN110 INTO WA_RNFN110.


*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 PATNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNFN110-PATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNFN110-PATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RSFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNFN110-RSFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNFN110-RSFNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field DOCTR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNFN110-DOCTR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNFN110-DOCTR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISOLA, internal->external for field SPRAS
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_RNFN110-SPRAS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNFN110-SPRAS.
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_RNFN110_STR, 
MANDT TYPE STRING,
PATNR TYPE STRING,
RSFNR TYPE STRING,
LFDNR TYPE STRING,
KZTXT TYPE STRING,
LGTXT TYPE STRING,
LOEKZ TYPE STRING,
LOUSR TYPE STRING,
LODAT TYPE STRING,
ERUSR TYPE STRING,
ERDAT TYPE STRING,
UPDAT TYPE STRING,
UPUSR TYPE STRING,
DOCTR TYPE STRING,
REPDT TYPE STRING,
ROUTE TYPE STRING,
ORGAN TYPE STRING,
PROBA TYPE STRING,
REACT TYPE STRING,
EXIST TYPE STRING,
CSTAT TYPE STRING,
ERTIM TYPE STRING,
UPTIM TYPE STRING,
EREASON TYPE STRING,
SPRAS TYPE STRING,
RSFNA TYPE STRING,
RSFKB TYPE STRING,
RSTYP TYPE STRING,
RSCAT TYPE STRING,
RNPMI TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNFN110_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_RNFN110_STR-MANDT sy-vline 
WA_RNFN110_STR-PATNR sy-vline 
WA_RNFN110_STR-RSFNR sy-vline 
WA_RNFN110_STR-LFDNR sy-vline 
WA_RNFN110_STR-KZTXT sy-vline 
WA_RNFN110_STR-LGTXT sy-vline 
WA_RNFN110_STR-LOEKZ sy-vline 
WA_RNFN110_STR-LOUSR sy-vline 
WA_RNFN110_STR-LODAT sy-vline 
WA_RNFN110_STR-ERUSR sy-vline 
WA_RNFN110_STR-ERDAT sy-vline 
WA_RNFN110_STR-UPDAT sy-vline 
WA_RNFN110_STR-UPUSR sy-vline 
WA_RNFN110_STR-DOCTR sy-vline 
WA_RNFN110_STR-REPDT sy-vline 
WA_RNFN110_STR-ROUTE sy-vline 
WA_RNFN110_STR-ORGAN sy-vline 
WA_RNFN110_STR-PROBA sy-vline 
WA_RNFN110_STR-REACT sy-vline 
WA_RNFN110_STR-EXIST sy-vline 
WA_RNFN110_STR-CSTAT sy-vline 
WA_RNFN110_STR-ERTIM sy-vline 
WA_RNFN110_STR-UPTIM sy-vline 
WA_RNFN110_STR-EREASON sy-vline 
WA_RNFN110_STR-SPRAS sy-vline 
WA_RNFN110_STR-RSFNA sy-vline 
WA_RNFN110_STR-RSFKB sy-vline 
WA_RNFN110_STR-RSTYP sy-vline 
WA_RNFN110_STR-RSCAT sy-vline 
WA_RNFN110_STR-RNPMI sy-vline      INTO ld_text SEPARATED BY SPACE.

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