ABAP Select data from SAP table RNRSFX into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNRSFX
*  INTO TABLE @DATA(IT_RNRSFX2).
*--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_RNRSFX INDEX 1 INTO DATA(WA_RNRSFX2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNRSFX>-KZTXTX = 1.
<RNRSFX>-LGTXTX = 1.
<RNRSFX>-LOEKZX = 1.
<RNRSFX>-LOUSRX = 1.
<RNRSFX>-LODATX = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNRSFX-ERUSRX, sy-vline,
  WA_RNRSFX-ERDATX, sy-vline,
  WA_RNRSFX-UPDATX, sy-vline,
  WA_RNRSFX-UPUSRX, sy-vline,
  WA_RNRSFX-DOCTRX, sy-vline,
  WA_RNRSFX-REPDTX, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNRSFX 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_RNRSFX 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_RNRSFX INTO WA_RNRSFX.


*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_RNRSFX_STR, 
KZTXTX TYPE STRING,
LGTXTX TYPE STRING,
LOEKZX TYPE STRING,
LOUSRX TYPE STRING,
LODATX TYPE STRING,
ERUSRX TYPE STRING,
ERDATX TYPE STRING,
UPDATX TYPE STRING,
UPUSRX TYPE STRING,
DOCTRX TYPE STRING,
REPDTX TYPE STRING,
ROUTEX TYPE STRING,
ORGANX TYPE STRING,
PROBAX TYPE STRING,
REACTX TYPE STRING,
EXISTX TYPE STRING,
CSTATX TYPE STRING,
ERTIMX TYPE STRING,
UPTIMX TYPE STRING,
EREASONX TYPE STRING,
LTEXTX TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNRSFX_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_RNRSFX_STR-KZTXTX sy-vline 
WA_RNRSFX_STR-LGTXTX sy-vline 
WA_RNRSFX_STR-LOEKZX sy-vline 
WA_RNRSFX_STR-LOUSRX sy-vline 
WA_RNRSFX_STR-LODATX sy-vline 
WA_RNRSFX_STR-ERUSRX sy-vline 
WA_RNRSFX_STR-ERDATX sy-vline 
WA_RNRSFX_STR-UPDATX sy-vline 
WA_RNRSFX_STR-UPUSRX sy-vline 
WA_RNRSFX_STR-DOCTRX sy-vline 
WA_RNRSFX_STR-REPDTX sy-vline 
WA_RNRSFX_STR-ROUTEX sy-vline 
WA_RNRSFX_STR-ORGANX sy-vline 
WA_RNRSFX_STR-PROBAX sy-vline 
WA_RNRSFX_STR-REACTX sy-vline 
WA_RNRSFX_STR-EXISTX sy-vline 
WA_RNRSFX_STR-CSTATX sy-vline 
WA_RNRSFX_STR-ERTIMX sy-vline 
WA_RNRSFX_STR-UPTIMX sy-vline 
WA_RNRSFX_STR-EREASONX sy-vline 
WA_RNRSFX_STR-LTEXTX sy-vline      INTO ld_text SEPARATED BY SPACE.

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