ABAP Select data from SAP table IWB_R3LREF into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP IWB_R3LREF 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 IWB_R3LREF. 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 IWB_R3LREF 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_IWB_R3LREF TYPE STANDARD TABLE OF IWB_R3LREF,
      WA_IWB_R3LREF TYPE IWB_R3LREF,
      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: <IWB_R3LREF> TYPE IWB_R3LREF.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_IWB_R3LREF.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM IWB_R3LREF
  INTO TABLE IT_IWB_R3LREF.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IWB_R3LREF
*  INTO TABLE @DATA(IT_IWB_R3LREF2).
*--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_IWB_R3LREF INDEX 1 INTO DATA(WA_IWB_R3LREF2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_IWB_R3LREF ASSIGNING <IWB_R3LREF>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<IWB_R3LREF>-ID_RESULT = 1.
<IWB_R3LREF>-ID = 1.
<IWB_R3LREF>-STRUCCLASS = 1.
<IWB_R3LREF>-STRUCOBJID = 1.
<IWB_R3LREF>-TOPICCLASS = 1.

ENDLOOP.

LOOP AT IT_IWB_R3LREF INTO WA_IWB_R3LREF.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_IWB_R3LREF-TOPICOBJID, sy-vline,
  WA_IWB_R3LREF-DEVCLASS, sy-vline,
  WA_IWB_R3LREF-TCODE, sy-vline,
  WA_IWB_R3LREF-PROGRAMM, sy-vline,
  WA_IWB_R3LREF-DYNPRONR, sy-vline,
  WA_IWB_R3LREF-SPEC_PRG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_IWB_R3LREF 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_IWB_R3LREF 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_IWB_R3LREF INTO WA_IWB_R3LREF.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_IWB_R3LREF_STR, 
ID_RESULT TYPE STRING,
ID TYPE STRING,
STRUCCLASS TYPE STRING,
STRUCOBJID TYPE STRING,
TOPICCLASS TYPE STRING,
TOPICOBJID TYPE STRING,
DEVCLASS TYPE STRING,
TCODE TYPE STRING,
PROGRAMM TYPE STRING,
DYNPRONR TYPE STRING,
SPEC_PRG TYPE STRING,
SPEC_TEXT TYPE STRING,
ENTRY_BY TYPE STRING,
ENTRY_DAT TYPE STRING,
INDUSTRY TYPE STRING,
INDUSTRYRL TYPE STRING,
COUNTRY TYPE STRING,
NO_LINK TYPE STRING,
SPEC_DYNP TYPE STRING,
EXPORTKEY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IWB_R3LREF_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_IWB_R3LREF_STR-ID_RESULT sy-vline 
WA_IWB_R3LREF_STR-ID sy-vline 
WA_IWB_R3LREF_STR-STRUCCLASS sy-vline 
WA_IWB_R3LREF_STR-STRUCOBJID sy-vline 
WA_IWB_R3LREF_STR-TOPICCLASS sy-vline 
WA_IWB_R3LREF_STR-TOPICOBJID sy-vline 
WA_IWB_R3LREF_STR-DEVCLASS sy-vline 
WA_IWB_R3LREF_STR-TCODE sy-vline 
WA_IWB_R3LREF_STR-PROGRAMM sy-vline 
WA_IWB_R3LREF_STR-DYNPRONR sy-vline 
WA_IWB_R3LREF_STR-SPEC_PRG sy-vline 
WA_IWB_R3LREF_STR-SPEC_TEXT sy-vline 
WA_IWB_R3LREF_STR-ENTRY_BY sy-vline 
WA_IWB_R3LREF_STR-ENTRY_DAT sy-vline 
WA_IWB_R3LREF_STR-INDUSTRY sy-vline 
WA_IWB_R3LREF_STR-INDUSTRYRL sy-vline 
WA_IWB_R3LREF_STR-COUNTRY sy-vline 
WA_IWB_R3LREF_STR-NO_LINK sy-vline 
WA_IWB_R3LREF_STR-SPEC_DYNP sy-vline 
WA_IWB_R3LREF_STR-EXPORTKEY sy-vline      INTO ld_text SEPARATED BY SPACE.

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