ABAP Select data from SAP table RNF41 into internal table

Get Example source ABAP code based on a different SAP table
  Get ABAP code

Below is a number of ABAP code snippets to demonstrate how to select data from SAP RNF41 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 RNF41. 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 RNF41 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_RNF41 TYPE STANDARD TABLE OF RNF41,
      WA_RNF41 TYPE RNF41,
      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: <RNF41> TYPE RNF41.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RNF41.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RNF41
  INTO TABLE IT_RNF41.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNF41
*  INTO TABLE @DATA(IT_RNF412).
*--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_RNF41 INDEX 1 INTO DATA(WA_RNF412).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RNF41 ASSIGNING <RNF41>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNF41>-DOKAR = 1.
<RNF41>-DOKNR = 1.
<RNF41>-DOKVR = 1.
<RNF41>-DOKTL = 1.
<RNF41>-DKTXT = 1.

ENDLOOP.

LOOP AT IT_RNF41 INTO WA_RNF41.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNF41-EXTNR, sy-vline,
  WA_RNF41-ENTLEIHER, sy-vline,
  WA_RNF41-ENTLTYP, sy-vline,
  WA_RNF41-LEIHDAT, sy-vline,
  WA_RNF41-LEIZEIT, sy-vline,
  WA_RNF41-ENTLEND, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNF41 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_RNF41 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_RNF41 INTO WA_RNF41.


*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 DOKNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF41-DOKNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF41-DOKNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ENTLEIHER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF41-ENTLEIHER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF41-ENTLEIHER.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ENTLTYP
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF41-ENTLTYP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF41-ENTLTYP.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ENTZW
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF41-ENTZW
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF41-ENTZW.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VERANTW
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF41-VERANTW
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF41-VERANTW.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PATNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF41-PATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF41-PATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field FALNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF41-FALNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF41-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_RNF41_STR, 
DOKAR TYPE STRING,
DOKNR TYPE STRING,
DOKVR TYPE STRING,
DOKTL TYPE STRING,
DKTXT TYPE STRING,
EXTNR TYPE STRING,
ENTLEIHER TYPE STRING,
ENTLTYP TYPE STRING,
LEIHDAT TYPE STRING,
LEIZEIT TYPE STRING,
ENTLEND TYPE STRING,
ENTZW TYPE STRING,
ENTZWTXT TYPE STRING,
RUEKDAT TYPE STRING,
ANZMAH TYPE STRING,
ERMAHN TYPE STRING,
LEMAHN TYPE STRING,
VERANTW TYPE STRING,
VERANTW_NA TYPE STRING,
PATNR TYPE STRING,
PZIFF TYPE STRING,
PATEX TYPE STRING,
FALNR TYPE STRING,
FZIFF TYPE STRING,
PATNAME TYPE STRING,
GBDAT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNF41_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_RNF41_STR-DOKAR sy-vline 
WA_RNF41_STR-DOKNR sy-vline 
WA_RNF41_STR-DOKVR sy-vline 
WA_RNF41_STR-DOKTL sy-vline 
WA_RNF41_STR-DKTXT sy-vline 
WA_RNF41_STR-EXTNR sy-vline 
WA_RNF41_STR-ENTLEIHER sy-vline 
WA_RNF41_STR-ENTLTYP sy-vline 
WA_RNF41_STR-LEIHDAT sy-vline 
WA_RNF41_STR-LEIZEIT sy-vline 
WA_RNF41_STR-ENTLEND sy-vline 
WA_RNF41_STR-ENTZW sy-vline 
WA_RNF41_STR-ENTZWTXT sy-vline 
WA_RNF41_STR-RUEKDAT sy-vline 
WA_RNF41_STR-ANZMAH sy-vline 
WA_RNF41_STR-ERMAHN sy-vline 
WA_RNF41_STR-LEMAHN sy-vline 
WA_RNF41_STR-VERANTW sy-vline 
WA_RNF41_STR-VERANTW_NA sy-vline 
WA_RNF41_STR-PATNR sy-vline 
WA_RNF41_STR-PZIFF sy-vline 
WA_RNF41_STR-PATEX sy-vline 
WA_RNF41_STR-FALNR sy-vline 
WA_RNF41_STR-FZIFF sy-vline 
WA_RNF41_STR-PATNAME sy-vline 
WA_RNF41_STR-GBDAT sy-vline      INTO ld_text SEPARATED BY SPACE.

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