ABAP Select data from SAP table /RTF/_S_SOURCE_FIELDS_02_DS 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 /RTF/_S_SOURCE_FIELDS_02_DS 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 /RTF/_S_SOURCE_FIELDS_02_DS. 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 /RTF/_S_SOURCE_FIELDS_02_DS 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_/RTF/_S_SOURCE_FIELDS_02_DS TYPE STANDARD TABLE OF /RTF/_S_SOURCE_FIELDS_02_DS,
      WA_/RTF/_S_SOURCE_FIELDS_02_DS TYPE /RTF/_S_SOURCE_FIELDS_02_DS,
      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: </RTF/_S_SOURCE_FIELDS_02_DS> TYPE /RTF/_S_SOURCE_FIELDS_02_DS.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_/RTF/_S_SOURCE_FIELDS_02_DS.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /RTF/_S_SOURCE_FIELDS_02_DS
  INTO TABLE IT_/RTF/_S_SOURCE_FIELDS_02_DS.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /RTF/_S_SOURCE_FIELDS_02_DS
*  INTO TABLE @DATA(IT_/RTF/_S_SOURCE_FIELDS_02_DS2).
*--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_/RTF/_S_SOURCE_FIELDS_02_DS INDEX 1 INTO DATA(WA_/RTF/_S_SOURCE_FIELDS_02_DS2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/RTF/_S_SOURCE_FIELDS_02_DS ASSIGNING </RTF/_S_SOURCE_FIELDS_02_DS>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</RTF/_S_SOURCE_FIELDS_02_DS>-BWVORG = 1.
</RTF/_S_SOURCE_FIELDS_02_DS>-AKTNR = 1.
</RTF/_S_SOURCE_FIELDS_02_DS>-BWMNG = 1.
</RTF/_S_SOURCE_FIELDS_02_DS>-BWGEO = 1.
</RTF/_S_SOURCE_FIELDS_02_DS>-BWGVO = 1.

ENDLOOP.

LOOP AT IT_/RTF/_S_SOURCE_FIELDS_02_DS INTO WA_/RTF/_S_SOURCE_FIELDS_02_DS.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/RTF/_S_SOURCE_FIELDS_02_DS-BWGVP, sy-vline,
  WA_/RTF/_S_SOURCE_FIELDS_02_DS-WAERS, sy-vline,
  WA_/RTF/_S_SOURCE_FIELDS_02_DS-HWAER, sy-vline,
  WA_/RTF/_S_SOURCE_FIELDS_02_DS-MEINS, sy-vline,
  WA_/RTF/_S_SOURCE_FIELDS_02_DS-LMEIN, sy-vline,
  WA_/RTF/_S_SOURCE_FIELDS_02_DS-UMREZ, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/RTF/_S_SOURCE_FIELDS_02_DS 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_/RTF/_S_SOURCE_FIELDS_02_DS 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_/RTF/_S_SOURCE_FIELDS_02_DS INTO WA_/RTF/_S_SOURCE_FIELDS_02_DS.


*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 CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_/RTF/_S_SOURCE_FIELDS_02_DS-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/RTF/_S_SOURCE_FIELDS_02_DS-MEINS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field LMEIN
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_/RTF/_S_SOURCE_FIELDS_02_DS-LMEIN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/RTF/_S_SOURCE_FIELDS_02_DS-LMEIN.
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_/RTF/_S_SOURCE_FIELDS_02_DS_STR, 
BWVORG TYPE STRING,
AKTNR TYPE STRING,
BWMNG TYPE STRING,
BWGEO TYPE STRING,
BWGVO TYPE STRING,
BWGVP TYPE STRING,
WAERS TYPE STRING,
HWAER TYPE STRING,
MEINS TYPE STRING,
LMEIN TYPE STRING,
UMREZ TYPE STRING,
UMREN TYPE STRING,
WKURS TYPE STRING,
DBWGEO TYPE STRING,
DBWMNG TYPE STRING,
BWGEOO TYPE STRING,
DATS TYPE STRING,
NOSCL TYPE STRING,
BUDAT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/RTF/_S_SOURCE_FIELDS_02_DS_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_/RTF/_S_SOURCE_FIELDS_02_DS_STR-BWVORG sy-vline 
WA_/RTF/_S_SOURCE_FIELDS_02_DS_STR-AKTNR sy-vline 
WA_/RTF/_S_SOURCE_FIELDS_02_DS_STR-BWMNG sy-vline 
WA_/RTF/_S_SOURCE_FIELDS_02_DS_STR-BWGEO sy-vline 
WA_/RTF/_S_SOURCE_FIELDS_02_DS_STR-BWGVO sy-vline 
WA_/RTF/_S_SOURCE_FIELDS_02_DS_STR-BWGVP sy-vline 
WA_/RTF/_S_SOURCE_FIELDS_02_DS_STR-WAERS sy-vline 
WA_/RTF/_S_SOURCE_FIELDS_02_DS_STR-HWAER sy-vline 
WA_/RTF/_S_SOURCE_FIELDS_02_DS_STR-MEINS sy-vline 
WA_/RTF/_S_SOURCE_FIELDS_02_DS_STR-LMEIN sy-vline 
WA_/RTF/_S_SOURCE_FIELDS_02_DS_STR-UMREZ sy-vline 
WA_/RTF/_S_SOURCE_FIELDS_02_DS_STR-UMREN sy-vline 
WA_/RTF/_S_SOURCE_FIELDS_02_DS_STR-WKURS sy-vline 
WA_/RTF/_S_SOURCE_FIELDS_02_DS_STR-DBWGEO sy-vline 
WA_/RTF/_S_SOURCE_FIELDS_02_DS_STR-DBWMNG sy-vline 
WA_/RTF/_S_SOURCE_FIELDS_02_DS_STR-BWGEOO sy-vline 
WA_/RTF/_S_SOURCE_FIELDS_02_DS_STR-DATS sy-vline 
WA_/RTF/_S_SOURCE_FIELDS_02_DS_STR-NOSCL sy-vline 
WA_/RTF/_S_SOURCE_FIELDS_02_DS_STR-BUDAT sy-vline      INTO ld_text SEPARATED BY SPACE.

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