ABAP Select data from SAP table RNF45 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RNF45 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 RNF45. 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 RNF45 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_RNF45 TYPE STANDARD TABLE OF RNF45,
      WA_RNF45 TYPE RNF45,
      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: <RNF45> TYPE RNF45.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RNF45.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RNF45
  INTO TABLE IT_RNF45.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNF45
*  INTO TABLE @DATA(IT_RNF452).
*--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_RNF45 INDEX 1 INTO DATA(WA_RNF452).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RNF45 ASSIGNING <RNF45>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNF45>-FALNR = 1.
<RNF45>-EINRI = 1.
<RNF45>-LFDNR = 1.
<RNF45>-LFDNM = 1.
<RNF45>-NOMID = 1.

ENDLOOP.

LOOP AT IT_RNF45 INTO WA_RNF45.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNF45-IDTYP, sy-vline,
  WA_RNF45-RANKN, sy-vline,
  WA_RNF45-RELSH, sy-vline,
  WA_RNF45-NNAME, sy-vline,
  WA_RNF45-VNAME, sy-vline,
  WA_RNF45-TITEL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNF45 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_RNF45 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_RNF45 INTO WA_RNF45.


*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 FALNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF45-FALNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF45-FALNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field EINRI
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF45-EINRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF45-EINRI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit NLJUS, internal->external for field NOMID
CALL FUNCTION 'CONVERSION_EXIT_NLJUS_OUTPUT'
  EXPORTING
    input =                      WA_RNF45-NOMID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF45-NOMID.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field IDTYP
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF45-IDTYP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF45-IDTYP.
WRITE:/ 'New Value:', ld_input.

*Conversion exit NLJUS, internal->external for field ACCNO
CALL FUNCTION 'CONVERSION_EXIT_NLJUS_OUTPUT'
  EXPORTING
    input =                      WA_RNF45-ACCNO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF45-ACCNO.
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_RNF45_STR, 
FALNR TYPE STRING,
EINRI TYPE STRING,
LFDNR TYPE STRING,
LFDNM TYPE STRING,
NOMID TYPE STRING,
IDTYP TYPE STRING,
RANKN TYPE STRING,
RELSH TYPE STRING,
NNAME TYPE STRING,
VNAME TYPE STRING,
TITEL TYPE STRING,
CONCNAM TYPE STRING,
GBDAT TYPE STRING,
ACCNO TYPE STRING,
BALDT TYPE STRING,
BALAN TYPE STRING,
MAXCP TYPE STRING,
MAXCA TYPE STRING,
APPAM TYPE STRING,
APSTATE TYPE STRING,
ASTEXT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNF45_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_RNF45_STR-FALNR sy-vline 
WA_RNF45_STR-EINRI sy-vline 
WA_RNF45_STR-LFDNR sy-vline 
WA_RNF45_STR-LFDNM sy-vline 
WA_RNF45_STR-NOMID sy-vline 
WA_RNF45_STR-IDTYP sy-vline 
WA_RNF45_STR-RANKN sy-vline 
WA_RNF45_STR-RELSH sy-vline 
WA_RNF45_STR-NNAME sy-vline 
WA_RNF45_STR-VNAME sy-vline 
WA_RNF45_STR-TITEL sy-vline 
WA_RNF45_STR-CONCNAM sy-vline 
WA_RNF45_STR-GBDAT sy-vline 
WA_RNF45_STR-ACCNO sy-vline 
WA_RNF45_STR-BALDT sy-vline 
WA_RNF45_STR-BALAN sy-vline 
WA_RNF45_STR-MAXCP sy-vline 
WA_RNF45_STR-MAXCA sy-vline 
WA_RNF45_STR-APPAM sy-vline 
WA_RNF45_STR-APSTATE sy-vline 
WA_RNF45_STR-ASTEXT sy-vline      INTO ld_text SEPARATED BY SPACE.

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