ABAP Select data from SAP table RNF40 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RNF40 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 RNF40. 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 RNF40 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_RNF40 TYPE STANDARD TABLE OF RNF40,
      WA_RNF40 TYPE RNF40,
      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: <RNF40> TYPE RNF40.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RNF40.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RNF40
  INTO TABLE IT_RNF40.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNF40
*  INTO TABLE @DATA(IT_RNF402).
*--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_RNF40 INDEX 1 INTO DATA(WA_RNF402).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RNF40 ASSIGNING <RNF40>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNF40>-ENTLEIHER = 1.
<RNF40>-ENTLTYP = 1.
<RNF40>-ANZMAH = 1.
<RNF40>-CONCAT_NAM = 1.
<RNF40>-NAME1 = 1.

ENDLOOP.

LOOP AT IT_RNF40 INTO WA_RNF40.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNF40-NAME2, sy-vline,
  WA_RNF40-NAME3, sy-vline,
  WA_RNF40-NAMEKURZ, sy-vline,
  WA_RNF40-ANRED, sy-vline,
  WA_RNF40-TITEL, sy-vline,
  WA_RNF40-NAMZU, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNF40 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_RNF40 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_RNF40 INTO WA_RNF40.


*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 ENTLEIHER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF40-ENTLEIHER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF40-ENTLEIHER.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ENTLTYP
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF40-ENTLTYP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF40-ENTLTYP.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ADRNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF40-ADRNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF40-ADRNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit SXIDN, internal->external for field EMAIL
CALL FUNCTION 'CONVERSION_EXIT_SXIDN_OUTPUT'
  EXPORTING
    input =                      WA_RNF40-EMAIL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF40-EMAIL.
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_RNF40_STR, 
ENTLEIHER TYPE STRING,
ENTLTYP TYPE STRING,
ANZMAH TYPE STRING,
CONCAT_NAM TYPE STRING,
NAME1 TYPE STRING,
NAME2 TYPE STRING,
NAME3 TYPE STRING,
NAMEKURZ TYPE STRING,
ANRED TYPE STRING,
TITEL TYPE STRING,
NAMZU TYPE STRING,
VORSW TYPE STRING,
GSCHL TYPE STRING,
TELFN TYPE STRING,
TELFX TYPE STRING,
TELEX TYPE STRING,
MANDT TYPE STRING,
ADRNR TYPE STRING,
ADROB TYPE STRING,
PSTLZ TYPE STRING,
LAND TYPE STRING,
REGIO TYPE STRING,
ORT TYPE STRING,
ORT2 TYPE STRING,
STRAS TYPE STRING,
STRAZ TYPE STRING,
EINZG TYPE STRING,
PSTLP TYPE STRING,
PFACH TYPE STRING,
LANPF TYPE STRING,
ORTPF TYPE STRING,
PSTLF TYPE STRING,
TELNR TYPE STRING,
TELXT TYPE STRING,
FAXNR TYPE STRING,
FAXXT TYPE STRING,
TEXNR TYPE STRING,
BUILD TYPE STRING,
FLOOR TYPE STRING,
ROOM TYPE STRING,
STORT TYPE STRING,
STOTT TYPE STRING,
STSTR TYPE STRING,
STSTZ TYPE STRING,
STORP TYPE STRING,
TELKZ TYPE STRING,
EMAIL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNF40_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_RNF40_STR-ENTLEIHER sy-vline 
WA_RNF40_STR-ENTLTYP sy-vline 
WA_RNF40_STR-ANZMAH sy-vline 
WA_RNF40_STR-CONCAT_NAM sy-vline 
WA_RNF40_STR-NAME1 sy-vline 
WA_RNF40_STR-NAME2 sy-vline 
WA_RNF40_STR-NAME3 sy-vline 
WA_RNF40_STR-NAMEKURZ sy-vline 
WA_RNF40_STR-ANRED sy-vline 
WA_RNF40_STR-TITEL sy-vline 
WA_RNF40_STR-NAMZU sy-vline 
WA_RNF40_STR-VORSW sy-vline 
WA_RNF40_STR-GSCHL sy-vline 
WA_RNF40_STR-TELFN sy-vline 
WA_RNF40_STR-TELFX sy-vline 
WA_RNF40_STR-TELEX sy-vline 
WA_RNF40_STR-MANDT sy-vline 
WA_RNF40_STR-ADRNR sy-vline 
WA_RNF40_STR-ADROB sy-vline 
WA_RNF40_STR-PSTLZ sy-vline 
WA_RNF40_STR-LAND sy-vline 
WA_RNF40_STR-REGIO sy-vline 
WA_RNF40_STR-ORT sy-vline 
WA_RNF40_STR-ORT2 sy-vline 
WA_RNF40_STR-STRAS sy-vline 
WA_RNF40_STR-STRAZ sy-vline 
WA_RNF40_STR-EINZG sy-vline 
WA_RNF40_STR-PSTLP sy-vline 
WA_RNF40_STR-PFACH sy-vline 
WA_RNF40_STR-LANPF sy-vline 
WA_RNF40_STR-ORTPF sy-vline 
WA_RNF40_STR-PSTLF sy-vline 
WA_RNF40_STR-TELNR sy-vline 
WA_RNF40_STR-TELXT sy-vline 
WA_RNF40_STR-FAXNR sy-vline 
WA_RNF40_STR-FAXXT sy-vline 
WA_RNF40_STR-TEXNR sy-vline 
WA_RNF40_STR-BUILD sy-vline 
WA_RNF40_STR-FLOOR sy-vline 
WA_RNF40_STR-ROOM sy-vline 
WA_RNF40_STR-STORT sy-vline 
WA_RNF40_STR-STOTT sy-vline 
WA_RNF40_STR-STSTR sy-vline 
WA_RNF40_STR-STSTZ sy-vline 
WA_RNF40_STR-STORP sy-vline 
WA_RNF40_STR-TELKZ sy-vline 
WA_RNF40_STR-EMAIL sy-vline      INTO ld_text SEPARATED BY SPACE.

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