ABAP Select data from SAP table RNF04 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RNF04 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 RNF04. 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 RNF04 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_RNF04 TYPE STANDARD TABLE OF RNF04,
      WA_RNF04 TYPE RNF04,
      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: <RNF04> TYPE RNF04.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RNF04.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RNF04
  INTO TABLE IT_RNF04.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNF04
*  INTO TABLE @DATA(IT_RNF042).
*--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_RNF04 INDEX 1 INTO DATA(WA_RNF042).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RNF04 ASSIGNING <RNF04>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNF04>-GLAND = 1.
<RNF04>-TODDT = 1.
<RNF04>-TODZT = 1.
<RNF04>-TODDB = 1.
<RNF04>-TODZB = 1.

ENDLOOP.

LOOP AT IT_RNF04 INTO WA_RNF04.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNF04-TODKZ, sy-vline,
  WA_RNF04-FAMST, sy-vline,
  WA_RNF04-FAMTX, sy-vline,
  WA_RNF04-KONFE, sy-vline,
  WA_RNF04-KOABK, sy-vline,
  WA_RNF04-NATIO, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNF04 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_RNF04 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_RNF04 INTO WA_RNF04.


*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 ISOLA, internal->external for field SPRAS
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_RNF04-SPRAS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF04-SPRAS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field DOCTYP
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF04-DOCTYP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF04-DOCTYP.
WRITE:/ 'New Value:', ld_input.

*Conversion exit NLJUS, internal->external for field DOCNR
CALL FUNCTION 'CONVERSION_EXIT_NLJUS_OUTPUT'
  EXPORTING
    input =                      WA_RNF04-DOCNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF04-DOCNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RFPAT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF04-RFPAT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF04-RFPAT.
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_RNF04_STR, 
GLAND TYPE STRING,
TODDT TYPE STRING,
TODZT TYPE STRING,
TODDB TYPE STRING,
TODZB TYPE STRING,
TODKZ TYPE STRING,
FAMST TYPE STRING,
FAMTX TYPE STRING,
KONFE TYPE STRING,
KOABK TYPE STRING,
NATIO TYPE STRING,
NATTX TYPE STRING,
SPRAS TYPE STRING,
BLAND TYPE STRING,
PFARR TYPE STRING,
SPEND TYPE STRING,
SPENT TYPE STRING,
VIPKZ TYPE STRING,
ARCHV TYPE STRING,
RESID TYPE STRING,
DOCTYP TYPE STRING,
DOCNR TYPE STRING,
EXTNR TYPE STRING,
RFPAT TYPE STRING,
BERUF TYPE STRING,
RVNUM TYPE STRING,
KZTXT TYPE STRING,
GBORT TYPE STRING,
PFORT TYPE STRING,
RISKF TYPE STRING,
ISTAT_BPL TYPE STRING,
ISTAT_BPLTXT TYPE STRING,
TAXNUM TYPE STRING,
TAXNUM_IND TYPE STRING,
STP TYPE STRING,
STP_ENDDT TYPE STRING,
CONS_PERSDATA TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNF04_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_RNF04_STR-GLAND sy-vline 
WA_RNF04_STR-TODDT sy-vline 
WA_RNF04_STR-TODZT sy-vline 
WA_RNF04_STR-TODDB sy-vline 
WA_RNF04_STR-TODZB sy-vline 
WA_RNF04_STR-TODKZ sy-vline 
WA_RNF04_STR-FAMST sy-vline 
WA_RNF04_STR-FAMTX sy-vline 
WA_RNF04_STR-KONFE sy-vline 
WA_RNF04_STR-KOABK sy-vline 
WA_RNF04_STR-NATIO sy-vline 
WA_RNF04_STR-NATTX sy-vline 
WA_RNF04_STR-SPRAS sy-vline 
WA_RNF04_STR-BLAND sy-vline 
WA_RNF04_STR-PFARR sy-vline 
WA_RNF04_STR-SPEND sy-vline 
WA_RNF04_STR-SPENT sy-vline 
WA_RNF04_STR-VIPKZ sy-vline 
WA_RNF04_STR-ARCHV sy-vline 
WA_RNF04_STR-RESID sy-vline 
WA_RNF04_STR-DOCTYP sy-vline 
WA_RNF04_STR-DOCNR sy-vline 
WA_RNF04_STR-EXTNR sy-vline 
WA_RNF04_STR-RFPAT sy-vline 
WA_RNF04_STR-BERUF sy-vline 
WA_RNF04_STR-RVNUM sy-vline 
WA_RNF04_STR-KZTXT sy-vline 
WA_RNF04_STR-GBORT sy-vline 
WA_RNF04_STR-PFORT sy-vline 
WA_RNF04_STR-RISKF sy-vline 
WA_RNF04_STR-ISTAT_BPL sy-vline 
WA_RNF04_STR-ISTAT_BPLTXT sy-vline 
WA_RNF04_STR-TAXNUM sy-vline 
WA_RNF04_STR-TAXNUM_IND sy-vline 
WA_RNF04_STR-STP sy-vline 
WA_RNF04_STR-STP_ENDDT sy-vline 
WA_RNF04_STR-CONS_PERSDATA sy-vline      INTO ld_text SEPARATED BY SPACE.

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