ABAP Select data from SAP table RNF50 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RNF50 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 RNF50. 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 RNF50 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_RNF50 TYPE STANDARD TABLE OF RNF50,
      WA_RNF50 TYPE RNF50,
      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: <RNF50> TYPE RNF50.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RNF50.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RNF50
  INTO TABLE IT_RNF50.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNF50
*  INTO TABLE @DATA(IT_RNF502).
*--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_RNF50 INDEX 1 INTO DATA(WA_RNF502).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RNF50 ASSIGNING <RNF50>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNF50>-VBELN = 1.
<RNF50>-VBTYP = 1.
<RNF50>-FKDAT = 1.
<RNF50>-NETWR = 1.
<RNF50>-MWSBK = 1.

ENDLOOP.

LOOP AT IT_RNF50 INTO WA_RNF50.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNF50-BRUWR, sy-vline,
  WA_RNF50-WAERK, sy-vline,
  WA_RNF50-WAERKZ, sy-vline,
  WA_RNF50-FNETWR, sy-vline,
  WA_RNF50-FMWSBK, sy-vline,
  WA_RNF50-FBRUWR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNF50 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_RNF50 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_RNF50 INTO WA_RNF50.


*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_RNF50-VBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF50-VBELN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KUNRG
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF50-KUNRG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF50-KUNRG.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KOSTR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF50-KOSTR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF50-KOSTR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field EINRI
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF50-EINRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF50-EINRI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field FALNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF50-FALNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF50-FALNR.
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_RNF50_STR, 
VBELN TYPE STRING,
VBTYP TYPE STRING,
FKDAT TYPE STRING,
NETWR TYPE STRING,
MWSBK TYPE STRING,
BRUWR TYPE STRING,
WAERK TYPE STRING,
WAERKZ TYPE STRING,
FNETWR TYPE STRING,
FMWSBK TYPE STRING,
FBRUWR TYPE STRING,
FWAERK TYPE STRING,
KUNRG TYPE STRING,
KOSTR TYPE STRING,
EINRI TYPE STRING,
FALNR TYPE STRING,
LFDVV TYPE STRING,
VERNR TYPE STRING,
KTRKZ TYPE STRING,
KT_NAME1 TYPE STRING,
KT_NAME2 TYPE STRING,
KT_NAME3 TYPE STRING,
KT_VORSW TYPE STRING,
KT_TITEL TYPE STRING,
SZ_NAME1 TYPE STRING,
SZ_NAME2 TYPE STRING,
SZ_NAME3 TYPE STRING,
SZ_VORSW TYPE STRING,
SZ_TITEL TYPE STRING,
CONCAT_KT TYPE STRING,
SIGN TYPE STRING,
EMPKZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNF50_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_RNF50_STR-VBELN sy-vline 
WA_RNF50_STR-VBTYP sy-vline 
WA_RNF50_STR-FKDAT sy-vline 
WA_RNF50_STR-NETWR sy-vline 
WA_RNF50_STR-MWSBK sy-vline 
WA_RNF50_STR-BRUWR sy-vline 
WA_RNF50_STR-WAERK sy-vline 
WA_RNF50_STR-WAERKZ sy-vline 
WA_RNF50_STR-FNETWR sy-vline 
WA_RNF50_STR-FMWSBK sy-vline 
WA_RNF50_STR-FBRUWR sy-vline 
WA_RNF50_STR-FWAERK sy-vline 
WA_RNF50_STR-KUNRG sy-vline 
WA_RNF50_STR-KOSTR sy-vline 
WA_RNF50_STR-EINRI sy-vline 
WA_RNF50_STR-FALNR sy-vline 
WA_RNF50_STR-LFDVV sy-vline 
WA_RNF50_STR-VERNR sy-vline 
WA_RNF50_STR-KTRKZ sy-vline 
WA_RNF50_STR-KT_NAME1 sy-vline 
WA_RNF50_STR-KT_NAME2 sy-vline 
WA_RNF50_STR-KT_NAME3 sy-vline 
WA_RNF50_STR-KT_VORSW sy-vline 
WA_RNF50_STR-KT_TITEL sy-vline 
WA_RNF50_STR-SZ_NAME1 sy-vline 
WA_RNF50_STR-SZ_NAME2 sy-vline 
WA_RNF50_STR-SZ_NAME3 sy-vline 
WA_RNF50_STR-SZ_VORSW sy-vline 
WA_RNF50_STR-SZ_TITEL sy-vline 
WA_RNF50_STR-CONCAT_KT sy-vline 
WA_RNF50_STR-SIGN sy-vline 
WA_RNF50_STR-EMPKZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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