ABAP Select data from SAP table RCNRF into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RCNRF
*  INTO TABLE @DATA(IT_RCNRF2).
*--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_RCNRF INDEX 1 INTO DATA(WA_RCNRF2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RCNRF>-MATNR = 1.
<RCNRF>-POSTP = 1.
<RCNRF>-XFEHL = 1.
<RCNRF>-SANKA = 1.
<RCNRF>-KZEAR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RCNRF-BDTER, sy-vline,
  WA_RCNRF-KDAUF, sy-vline,
  WA_RCNRF-PSPEL, sy-vline,
  WA_RCNRF-VORNR, sy-vline,
  WA_RCNRF-XWAOK, sy-vline,
  WA_RCNRF-NO_DISP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RCNRF 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_RCNRF 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_RCNRF INTO WA_RCNRF.


*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 MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_RCNRF-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCNRF-MATNR.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ABPSP, internal->external for field PSPEL
CALL FUNCTION 'CONVERSION_EXIT_ABPSP_OUTPUT'
  EXPORTING
    input =                      WA_RCNRF-PSPEL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCNRF-PSPEL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit NUMCV, internal->external for field VORNR
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_RCNRF-VORNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCNRF-VORNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit NUMCV, internal->external for field POSNR
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_RCNRF-POSNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCNRF-POSNR.
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_RCNRF_STR, 
MATNR TYPE STRING,
POSTP TYPE STRING,
XFEHL TYPE STRING,
SANKA TYPE STRING,
KZEAR TYPE STRING,
BDTER TYPE STRING,
KDAUF TYPE STRING,
PSPEL TYPE STRING,
VORNR TYPE STRING,
XWAOK TYPE STRING,
NO_DISP TYPE STRING,
RSPOS TYPE STRING,
RSNUM TYPE STRING,
POSNR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RCNRF_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_RCNRF_STR-MATNR sy-vline 
WA_RCNRF_STR-POSTP sy-vline 
WA_RCNRF_STR-XFEHL sy-vline 
WA_RCNRF_STR-SANKA sy-vline 
WA_RCNRF_STR-KZEAR sy-vline 
WA_RCNRF_STR-BDTER sy-vline 
WA_RCNRF_STR-KDAUF sy-vline 
WA_RCNRF_STR-PSPEL sy-vline 
WA_RCNRF_STR-VORNR sy-vline 
WA_RCNRF_STR-XWAOK sy-vline 
WA_RCNRF_STR-NO_DISP sy-vline 
WA_RCNRF_STR-RSPOS sy-vline 
WA_RCNRF_STR-RSNUM sy-vline 
WA_RCNRF_STR-POSNR sy-vline      INTO ld_text SEPARATED BY SPACE.

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