ABAP Select data from SAP table RNLRF into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNLRF
*  INTO TABLE @DATA(IT_RNLRF2).
*--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_RNLRF INDEX 1 INTO DATA(WA_RNLRF2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNLRF>-RGART = 1.
<RNLRF>-AKTION = 1.
<RNLRF>-FPEDT = 1.
<RNLRF>-FPEDT_X = 1.
<RNLRF>-VORGR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNLRF-VORGR_X, sy-vline,
  WA_RNLRF-ARBGB, sy-vline,
  WA_RNLRF-MSGNR, sy-vline,
  WA_RNLRF-MSGV1, sy-vline,
  WA_RNLRF-MSGV2, sy-vline,
  WA_RNLRF-MSGV3, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNLRF 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_RNLRF 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_RNLRF INTO WA_RNLRF.


*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 RGART
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNLRF-RGART
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNLRF-RGART.
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_RNLRF_STR, 
RGART TYPE STRING,
AKTION TYPE STRING,
FPEDT TYPE STRING,
FPEDT_X TYPE STRING,
VORGR TYPE STRING,
VORGR_X TYPE STRING,
ARBGB TYPE STRING,
MSGNR TYPE STRING,
MSGV1 TYPE STRING,
MSGV2 TYPE STRING,
MSGV3 TYPE STRING,
MSGV4 TYPE STRING,
AKTDF TYPE STRING,
NOPOP TYPE STRING,
AKTBI TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNLRF_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_RNLRF_STR-RGART sy-vline 
WA_RNLRF_STR-AKTION sy-vline 
WA_RNLRF_STR-FPEDT sy-vline 
WA_RNLRF_STR-FPEDT_X sy-vline 
WA_RNLRF_STR-VORGR sy-vline 
WA_RNLRF_STR-VORGR_X sy-vline 
WA_RNLRF_STR-ARBGB sy-vline 
WA_RNLRF_STR-MSGNR sy-vline 
WA_RNLRF_STR-MSGV1 sy-vline 
WA_RNLRF_STR-MSGV2 sy-vline 
WA_RNLRF_STR-MSGV3 sy-vline 
WA_RNLRF_STR-MSGV4 sy-vline 
WA_RNLRF_STR-AKTDF sy-vline 
WA_RNLRF_STR-NOPOP sy-vline 
WA_RNLRF_STR-AKTBI sy-vline      INTO ld_text SEPARATED BY SPACE.

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