Regardin handling exception in a function, while using that function in sql

Question

Hi gurus,
I have a question regarding logging exceptions while using functions.
I wrote a separate package to handle errors, where i have a procedure.
In this proc i'm logging my error into a table and then raise the error to the front end.
Ex:
proc_log_and_raise    -- this proc... inserts my error into a table and then raisenow i included this error procedure in all functions and procedures.
consider an example with a sample procedure and function.
function func_1(( v_var   varchar2) return varchar2 is
begin
     select   column2
     from     table2
    where col1 = v_var;
exception
    when others then
         proc_log_and_raise;
end;  
procedure proc_1( v_var   varchar2) is
begin
    select   func_1(v_var)  -- error occurs here..
    from     table_a
    where   col1 = v_var;
exception
    when others then
         proc_log_and_raise;
end;    now i do
exec  proc_1( v_var );but now my problem is, when an error occurs in func_1, i'm getting an error with DML operation ( as we are inserting into error table)
ORA-14551: cannot perform a DML operation inside a query.
so what i want to do is, log both function and procedure where error occured.
So is there any other better way, we can write our exception handling, so that i can log error and use function in a select statement.
thank you.

Answer 1

I changed my procedure a little, to make it simple.
FUNCTION        PKG_WEEKLY.FUNC_1
            RETURN NUMBER IS 
            exc exception;
BEGIN                         
            raise exc;
            RETURN           v_provr_rcoupt;
EXCEPTION
            when exc then
                        PKG.PKG_ERROR.USP_LOG_AND_RAISE(
                                    'batch_1',
                                    'func_1',
                                    SQLCODE,
                                    DBMS_UTILITY.FORMAT_ERROR_STACK || DBMS_UTILITY.FORMAT_ERROR_BACKTRACE()); 
END FUNC_1;     
PROCEDURE    PKG_WEEKLY.PROC_1(
            cur_details                                OUT      sys_refcursor) IS
BEGIN
            OPEN cur_details FOR
            SELECT            NVL(PKG.PKG_WEEKLY.FUNC_1,0))    FROM DUAL;
EXCEPTION
            WHEN OTHERS THEN
                        REPORT_APP_PKG.PKG_REPORT_ERROR.USP_LOG_AND_RAISE(
                                    'batch_1',
                                    'PROC_1',
                                    SQLCODE,
                                    DBMS_UTILITY.FORMAT_ERROR_STACK || DBMS_UTILITY.FORMAT_ERROR_BACKTRACE());  
END PROC_1; Now i execute it.
exec PKG_WEEKLY.PROC_1(:cursor); Error logged into the table:
242 batch_1 func_1 ORA-06510: PL/SQL: unhandled user-defined exception
ORA-06512: at "REPORT_APP_PKG.PKG_REPORT_WEEKLY_CAO", line 230
04/14/2009 16:09:25
ERRORS displayed to the front end:
ORA-20156: ORA-06510: PL/SQL: unhandled user-defined exception
ORA-06512: at "PKG.PKG_WEEKLY", line 230
ORA-06512: at "PKG.PKG_ERROR", line 48
ORA-06512: at "PKG.PKG_ERROR", line 226
ORA-06512: at "PKG.PKG_WEEKLY", line 261
thank you