ABAP Select data from SAP table WVFB_FEHLER into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WVFB_FEHLER
*  INTO TABLE @DATA(IT_WVFB_FEHLER2).
*--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_WVFB_FEHLER INDEX 1 INTO DATA(WA_WVFB_FEHLER2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WVFB_FEHLER>-WGSREQN = 1.
<WVFB_FEHLER>-WGSREQP = 1.
<WVFB_FEHLER>-WGSREQF = 1.
<WVFB_FEHLER>-MSGNO = 1.
<WVFB_FEHLER>-MSGID = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WVFB_FEHLER-MSGTY, sy-vline,
  WA_WVFB_FEHLER-PARAMETER1, sy-vline,
  WA_WVFB_FEHLER-PARAMETER2, sy-vline,
  WA_WVFB_FEHLER-PARAMETER3, sy-vline,
  WA_WVFB_FEHLER-PARAMETER4, sy-vline,
  WA_WVFB_FEHLER-WF_REFNR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WVFB_FEHLER 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_WVFB_FEHLER 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_WVFB_FEHLER INTO WA_WVFB_FEHLER.


*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 WGSREQN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WVFB_FEHLER-WGSREQN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WVFB_FEHLER-WGSREQN.
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_WVFB_FEHLER_STR, 
WGSREQN TYPE STRING,
WGSREQP TYPE STRING,
WGSREQF TYPE STRING,
MSGNO TYPE STRING,
MSGID TYPE STRING,
MSGTY TYPE STRING,
PARAMETER1 TYPE STRING,
PARAMETER2 TYPE STRING,
PARAMETER3 TYPE STRING,
PARAMETER4 TYPE STRING,
WF_REFNR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WVFB_FEHLER_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_WVFB_FEHLER_STR-WGSREQN sy-vline 
WA_WVFB_FEHLER_STR-WGSREQP sy-vline 
WA_WVFB_FEHLER_STR-WGSREQF sy-vline 
WA_WVFB_FEHLER_STR-MSGNO sy-vline 
WA_WVFB_FEHLER_STR-MSGID sy-vline 
WA_WVFB_FEHLER_STR-MSGTY sy-vline 
WA_WVFB_FEHLER_STR-PARAMETER1 sy-vline 
WA_WVFB_FEHLER_STR-PARAMETER2 sy-vline 
WA_WVFB_FEHLER_STR-PARAMETER3 sy-vline 
WA_WVFB_FEHLER_STR-PARAMETER4 sy-vline 
WA_WVFB_FEHLER_STR-WF_REFNR sy-vline      INTO ld_text SEPARATED BY SPACE.

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