ABAP Select data from SAP table WFERR into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WFERR
*  INTO TABLE @DATA(IT_WFERR2).
*--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_WFERR INDEX 1 INTO DATA(WA_WFERR2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WFERR>-SYST = 1.
<WFERR>-MANDT = 1.
<WFERR>-PRCNR = 1.
<WFERR>-ERRNUM = 1.
<WFERR>-MSGID = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WFERR-MSGNO, sy-vline,
  WA_WFERR-MSGV1, sy-vline,
  WA_WFERR-MSGV2, sy-vline,
  WA_WFERR-MSGV3, sy-vline,
  WA_WFERR-MSGV4, sy-vline,
  WA_WFERR-DONE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WFERR 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_WFERR 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_WFERR INTO WA_WFERR.


*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_WFERR_STR, 
SYST TYPE STRING,
MANDT TYPE STRING,
PRCNR TYPE STRING,
ERRNUM TYPE STRING,
MSGID TYPE STRING,
MSGNO TYPE STRING,
MSGV1 TYPE STRING,
MSGV2 TYPE STRING,
MSGV3 TYPE STRING,
MSGV4 TYPE STRING,
DONE TYPE STRING,
BATCH TYPE STRING,
LUSER TYPE STRING,
LDATE TYPE STRING,
LTIME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WFERR_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_WFERR_STR-SYST sy-vline 
WA_WFERR_STR-MANDT sy-vline 
WA_WFERR_STR-PRCNR sy-vline 
WA_WFERR_STR-ERRNUM sy-vline 
WA_WFERR_STR-MSGID sy-vline 
WA_WFERR_STR-MSGNO sy-vline 
WA_WFERR_STR-MSGV1 sy-vline 
WA_WFERR_STR-MSGV2 sy-vline 
WA_WFERR_STR-MSGV3 sy-vline 
WA_WFERR_STR-MSGV4 sy-vline 
WA_WFERR_STR-DONE sy-vline 
WA_WFERR_STR-BATCH sy-vline 
WA_WFERR_STR-LUSER sy-vline 
WA_WFERR_STR-LDATE sy-vline 
WA_WFERR_STR-LTIME sy-vline      INTO ld_text SEPARATED BY SPACE.

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