ABAP Select data from SAP table RNF29 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RNF29 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 RNF29. 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 RNF29 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_RNF29 TYPE STANDARD TABLE OF RNF29,
      WA_RNF29 TYPE RNF29,
      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: <RNF29> TYPE RNF29.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RNF29.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RNF29
  INTO TABLE IT_RNF29.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNF29
*  INTO TABLE @DATA(IT_RNF292).
*--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_RNF29 INDEX 1 INTO DATA(WA_RNF292).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RNF29 ASSIGNING <RNF29>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNF29>-ICBWIDT = 1.
<RNF29>-ICBWIZT = 1.
<RNF29>-ICBWART = 1.
<RNF29>-ICBWATX = 1.
<RNF29>-ICORGFA = 1.

ENDLOOP.

LOOP AT IT_RNF29 INTO WA_RNF29.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNF29-ICFAKEY, sy-vline,
  WA_RNF29-ICORGPF, sy-vline,
  WA_RNF29-ICTARLS, sy-vline,
  WA_RNF29-ICTARLSTXT, sy-vline,
  WA_RNF29-ICPMK, sy-vline,
  WA_RNF29-ICPML, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNF29 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_RNF29 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_RNF29 INTO WA_RNF29.


*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 ICORGFA
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF29-ICORGFA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF29-ICORGFA.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ICFAKEY
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF29-ICFAKEY
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF29-ICFAKEY.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ICORGPF
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF29-ICORGPF
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF29-ICORGPF.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ICTARLS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF29-ICTARLS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF29-ICTARLS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ICPMK
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF29-ICPMK
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF29-ICPMK.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ICPML
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF29-ICPML
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF29-ICPML.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ICDLO
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF29-ICDLO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF29-ICDLO.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ICDGW
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF29-ICDGW
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF29-ICDGW.
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_RNF29_STR, 
ICBWIDT TYPE STRING,
ICBWIZT TYPE STRING,
ICBWART TYPE STRING,
ICBWATX TYPE STRING,
ICORGFA TYPE STRING,
ICFAKEY TYPE STRING,
ICORGPF TYPE STRING,
ICTARLS TYPE STRING,
ICTARLSTXT TYPE STRING,
ICPMK TYPE STRING,
ICPML TYPE STRING,
ICPTXT TYPE STRING,
ICPHC TYPE STRING,
ICDITXT TYPE STRING,
ICDKAT1 TYPE STRING,
ICDKEY1 TYPE STRING,
ICDKAT_REF TYPE STRING,
ICDKEY_REF TYPE STRING,
ICDIATXT1 TYPE STRING,
ICDIATXT2 TYPE STRING,
ICDIATXTR1 TYPE STRING,
ICDIATXTR2 TYPE STRING,
ICANZOP TYPE STRING,
ICDLO TYPE STRING,
ICDGW TYPE STRING,
ICD1TYP TYPE STRING,
ICDREFTYP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNF29_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_RNF29_STR-ICBWIDT sy-vline 
WA_RNF29_STR-ICBWIZT sy-vline 
WA_RNF29_STR-ICBWART sy-vline 
WA_RNF29_STR-ICBWATX sy-vline 
WA_RNF29_STR-ICORGFA sy-vline 
WA_RNF29_STR-ICFAKEY sy-vline 
WA_RNF29_STR-ICORGPF sy-vline 
WA_RNF29_STR-ICTARLS sy-vline 
WA_RNF29_STR-ICTARLSTXT sy-vline 
WA_RNF29_STR-ICPMK sy-vline 
WA_RNF29_STR-ICPML sy-vline 
WA_RNF29_STR-ICPTXT sy-vline 
WA_RNF29_STR-ICPHC sy-vline 
WA_RNF29_STR-ICDITXT sy-vline 
WA_RNF29_STR-ICDKAT1 sy-vline 
WA_RNF29_STR-ICDKEY1 sy-vline 
WA_RNF29_STR-ICDKAT_REF sy-vline 
WA_RNF29_STR-ICDKEY_REF sy-vline 
WA_RNF29_STR-ICDIATXT1 sy-vline 
WA_RNF29_STR-ICDIATXT2 sy-vline 
WA_RNF29_STR-ICDIATXTR1 sy-vline 
WA_RNF29_STR-ICDIATXTR2 sy-vline 
WA_RNF29_STR-ICANZOP sy-vline 
WA_RNF29_STR-ICDLO sy-vline 
WA_RNF29_STR-ICDGW sy-vline 
WA_RNF29_STR-ICD1TYP sy-vline 
WA_RNF29_STR-ICDREFTYP sy-vline      INTO ld_text SEPARATED BY SPACE.

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