ABAP Select data from SAP table WBRFN into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WBRFN
*  INTO TABLE @DATA(IT_WBRFN2).
*--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_WBRFN INDEX 1 INTO DATA(WA_WBRFN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WBRFN>-MANDT = 1.
<WBRFN>-RUUID = 1.
<WBRFN>-REF_DOC_NR = 1.
<WBRFN>-REF_DOC_YEAR = 1.
<WBRFN>-REF_LOG_SYS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WBRFN-POSNV, sy-vline,
  WA_WBRFN-WBELNN, sy-vline,
  WA_WBRFN-POSNN, sy-vline,
  WA_WBRFN-LFTYPN, sy-vline,
  WA_WBRFN-LFTYPV, sy-vline,
  WA_WBRFN-ERDAT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WBRFN 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_WBRFN 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_WBRFN INTO WA_WBRFN.


*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 GJAHR, internal->external for field REF_DOC_YEAR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_WBRFN-REF_DOC_YEAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WBRFN-REF_DOC_YEAR.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ALPHA, internal->external for field WBELNN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WBRFN-WBELNN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WBRFN-WBELNN.
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_WBRFN_STR, 
MANDT TYPE STRING,
RUUID TYPE STRING,
REF_DOC_NR TYPE STRING,
REF_DOC_YEAR TYPE STRING,
REF_LOG_SYS TYPE STRING,
POSNV TYPE STRING,
WBELNN TYPE STRING,
POSNN TYPE STRING,
LFTYPN TYPE STRING,
LFTYPV TYPE STRING,
ERDAT TYPE STRING,
ERZET TYPE STRING,
ERNAM TYPE STRING,
ABARTN TYPE STRING,
WDTYPV TYPE STRING,
WDTYPN TYPE STRING,
REF_USE_CASE TYPE STRING,
_DATAAGING TYPE STRING,
REF_DOC_BUKRS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WBRFN_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_WBRFN_STR-MANDT sy-vline 
WA_WBRFN_STR-RUUID sy-vline 
WA_WBRFN_STR-REF_DOC_NR sy-vline 
WA_WBRFN_STR-REF_DOC_YEAR sy-vline 
WA_WBRFN_STR-REF_LOG_SYS sy-vline 
WA_WBRFN_STR-POSNV sy-vline 
WA_WBRFN_STR-WBELNN sy-vline 
WA_WBRFN_STR-POSNN sy-vline 
WA_WBRFN_STR-LFTYPN sy-vline 
WA_WBRFN_STR-LFTYPV sy-vline 
WA_WBRFN_STR-ERDAT sy-vline 
WA_WBRFN_STR-ERZET sy-vline 
WA_WBRFN_STR-ERNAM sy-vline 
WA_WBRFN_STR-ABARTN sy-vline 
WA_WBRFN_STR-WDTYPV sy-vline 
WA_WBRFN_STR-WDTYPN sy-vline 
WA_WBRFN_STR-REF_USE_CASE sy-vline 
WA_WBRFN_STR-_DATAAGING sy-vline 
WA_WBRFN_STR-REF_DOC_BUKRS sy-vline      INTO ld_text SEPARATED BY SPACE.

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