ABAP Select data from SAP table RNF68 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RNF68 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 RNF68. 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 RNF68 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_RNF68 TYPE STANDARD TABLE OF RNF68,
      WA_RNF68 TYPE RNF68,
      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: <RNF68> TYPE RNF68.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RNF68.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RNF68
  INTO TABLE IT_RNF68.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNF68
*  INTO TABLE @DATA(IT_RNF682).
*--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_RNF68 INDEX 1 INTO DATA(WA_RNF682).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RNF68 ASSIGNING <RNF68>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNF68>-DKAT = 1.
<RNF68>-DKEY = 1.
<RNF68>-DIKTXT = 1.
<RNF68>-DIKTX2 = 1.
<RNF68>-DTYP = 1.

ENDLOOP.

LOOP AT IT_RNF68 INTO WA_RNF68.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNF68-DKAT2, sy-vline,
  WA_RNF68-DKEY2, sy-vline,
  WA_RNF68-RDKAT, sy-vline,
  WA_RNF68-RDKEY, sy-vline,
  WA_RNF68-RDIKTXT, sy-vline,
  WA_RNF68-RDIKTX2, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNF68 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_RNF68 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_RNF68 INTO WA_RNF68.


*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 DIALO
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF68-DIALO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF68-DIALO.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field DIAGW
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF68-DIAGW
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF68-DIAGW.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field DIAPE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF68-DIAPE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF68-DIAPE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field BELNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF68-BELNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF68-BELNR.
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_RNF68_STR, 
DKAT TYPE STRING,
DKEY TYPE STRING,
DIKTXT TYPE STRING,
DIKTX2 TYPE STRING,
DTYP TYPE STRING,
DKAT2 TYPE STRING,
DKEY2 TYPE STRING,
RDKAT TYPE STRING,
RDKEY TYPE STRING,
RDIKTXT TYPE STRING,
RDIKTX2 TYPE STRING,
RDTYP TYPE STRING,
DITXT TYPE STRING,
DILTX TYPE STRING,
DIALO TYPE STRING,
DIAGW TYPE STRING,
DRG_CATEGORY TYPE STRING,
DRG_CC TYPE STRING,
DRG_RELVANT TYPE STRING,
CCL TYPE STRING,
EWDIA TYPE STRING,
BHDIA TYPE STRING,
AFDIA TYPE STRING,
ENDIA TYPE STRING,
FHDIA TYPE STRING,
KHDIA TYPE STRING,
OPDIA TYPE STRING,
DIADT TYPE STRING,
DIAZT TYPE STRING,
DIAPE TYPE STRING,
LFDBEW TYPE STRING,
BELNR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNF68_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_RNF68_STR-DKAT sy-vline 
WA_RNF68_STR-DKEY sy-vline 
WA_RNF68_STR-DIKTXT sy-vline 
WA_RNF68_STR-DIKTX2 sy-vline 
WA_RNF68_STR-DTYP sy-vline 
WA_RNF68_STR-DKAT2 sy-vline 
WA_RNF68_STR-DKEY2 sy-vline 
WA_RNF68_STR-RDKAT sy-vline 
WA_RNF68_STR-RDKEY sy-vline 
WA_RNF68_STR-RDIKTXT sy-vline 
WA_RNF68_STR-RDIKTX2 sy-vline 
WA_RNF68_STR-RDTYP sy-vline 
WA_RNF68_STR-DITXT sy-vline 
WA_RNF68_STR-DILTX sy-vline 
WA_RNF68_STR-DIALO sy-vline 
WA_RNF68_STR-DIAGW sy-vline 
WA_RNF68_STR-DRG_CATEGORY sy-vline 
WA_RNF68_STR-DRG_CC sy-vline 
WA_RNF68_STR-DRG_RELVANT sy-vline 
WA_RNF68_STR-CCL sy-vline 
WA_RNF68_STR-EWDIA sy-vline 
WA_RNF68_STR-BHDIA sy-vline 
WA_RNF68_STR-AFDIA sy-vline 
WA_RNF68_STR-ENDIA sy-vline 
WA_RNF68_STR-FHDIA sy-vline 
WA_RNF68_STR-KHDIA sy-vline 
WA_RNF68_STR-OPDIA sy-vline 
WA_RNF68_STR-DIADT sy-vline 
WA_RNF68_STR-DIAZT sy-vline 
WA_RNF68_STR-DIAPE sy-vline 
WA_RNF68_STR-LFDBEW sy-vline 
WA_RNF68_STR-BELNR sy-vline      INTO ld_text SEPARATED BY SPACE.

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