Trapping user defined exceptions in forms

Question

hi guys..
i have a database trigger that goes like that:
CREATE OR REPLACE TRIGGER loan_trig
before insert on loans
for each row
declare
lcount number(10);
duplicate_loan exception;
begin
select count(1) into lcount from loans
where branch_code=:new.branch_code
and client_code=:new.client_code;
if lcount>0 then
raise duplicate_loan;
end if;
end;
now how do i trap this user defined exception on the form ?
declaring the exception in the form & handling it in the exeption handler section doesn't seem to work and i get the following error:
"when button pressed trigger raised unhandled exception
ora-06510"
ora-06510:unhandled user-defined exception
what am i doing wrong?
if i have to handle the exception in the trigger body how do i do that?
thankx in advance..

Answer 1

Hello,
raise duplicate_loan; won't avoid the trigger to insert and commit. If you really want to avoid the insertion, use the raise_applicatrion_error() instead.
For instance : Raise_Application_Error( -20001, 'Insertion cannot be validated' );Then in your Forms module, you can catch it like this:
   Begin
   Insert Into ...
   when others then
      LC$Erreur := Substr( SQLERRM,1 , 500 );
      LN$err_code := ABS(SQLCODE);
      If LN$err_code = 20001 Then ...
   End;
...Francois