ABAP Select data from SAP table RNFDRG into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RNFDRG 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 RNFDRG. 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 RNFDRG 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_RNFDRG TYPE STANDARD TABLE OF RNFDRG,
      WA_RNFDRG TYPE RNFDRG,
      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: <RNFDRG> TYPE RNFDRG.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNFDRG
*  INTO TABLE @DATA(IT_RNFDRG2).
*--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_RNFDRG INDEX 1 INTO DATA(WA_RNFDRG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNFDRG>-VBELN = 1.
<RNFDRG>-POSNR = 1.
<RNFDRG>-ABTAR = 1.
<RNFDRG>-ABLST = 1.
<RNFDRG>-DRGL = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNFDRG-DRGK, sy-vline,
  WA_RNFDRG-DRGV, sy-vline,
  WA_RNFDRG-DRGW, sy-vline,
  WA_RNFDRG-REWTY, sy-vline,
  WA_RNFDRG-KTEXT, sy-vline,
  WA_RNFDRG-SURDIS_AMOUNT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNFDRG 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_RNFDRG 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_RNFDRG INTO WA_RNFDRG.


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

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

*Conversion exit ALPHA, internal->external for field ABLST
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNFDRG-ABLST
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNFDRG-ABLST.
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_RNFDRG_STR, 
VBELN TYPE STRING,
POSNR TYPE STRING,
ABTAR TYPE STRING,
ABLST TYPE STRING,
DRGL TYPE STRING,
DRGK TYPE STRING,
DRGV TYPE STRING,
DRGW TYPE STRING,
REWTY TYPE STRING,
KTEXT TYPE STRING,
SURDIS_AMOUNT TYPE STRING,
WAERS TYPE STRING,
SURDIS_AMT_DAY TYPE STRING,
SURDIS_DAYS TYPE STRING,
RSURDIS TYPE STRING,
VWD TYPE STRING,
VWD_BILL TYPE STRING,
VPROZ TYPE STRING,
DRG_PRICE TYPE STRING,
DRG_GROSSPRICE TYPE STRING,
BEGDT TYPE STRING,
ENDDT TYPE STRING,
USRAMT1 TYPE STRING,
USRAMT2 TYPE STRING,
USRDATE1 TYPE STRING,
USRDATE2 TYPE STRING,
USRTXT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNFDRG_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_RNFDRG_STR-VBELN sy-vline 
WA_RNFDRG_STR-POSNR sy-vline 
WA_RNFDRG_STR-ABTAR sy-vline 
WA_RNFDRG_STR-ABLST sy-vline 
WA_RNFDRG_STR-DRGL sy-vline 
WA_RNFDRG_STR-DRGK sy-vline 
WA_RNFDRG_STR-DRGV sy-vline 
WA_RNFDRG_STR-DRGW sy-vline 
WA_RNFDRG_STR-REWTY sy-vline 
WA_RNFDRG_STR-KTEXT sy-vline 
WA_RNFDRG_STR-SURDIS_AMOUNT sy-vline 
WA_RNFDRG_STR-WAERS sy-vline 
WA_RNFDRG_STR-SURDIS_AMT_DAY sy-vline 
WA_RNFDRG_STR-SURDIS_DAYS sy-vline 
WA_RNFDRG_STR-RSURDIS sy-vline 
WA_RNFDRG_STR-VWD sy-vline 
WA_RNFDRG_STR-VWD_BILL sy-vline 
WA_RNFDRG_STR-VPROZ sy-vline 
WA_RNFDRG_STR-DRG_PRICE sy-vline 
WA_RNFDRG_STR-DRG_GROSSPRICE sy-vline 
WA_RNFDRG_STR-BEGDT sy-vline 
WA_RNFDRG_STR-ENDDT sy-vline 
WA_RNFDRG_STR-USRAMT1 sy-vline 
WA_RNFDRG_STR-USRAMT2 sy-vline 
WA_RNFDRG_STR-USRDATE1 sy-vline 
WA_RNFDRG_STR-USRDATE2 sy-vline 
WA_RNFDRG_STR-USRTXT sy-vline      INTO ld_text SEPARATED BY SPACE.

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