Re: Question on Insert Trigger

zigzagdna_at_yahoo.com wrote:
> I am using 10.2.0.3 on HP UNIX 11i.
>
> I have a third party application where I do not have access to code.
> When rows are inserted in a table, I do not want certain rows to be
> inserted . Rest of the rows should be inserted. Is it is possible to
> do this using a trigger.
>
> I wrote a trigger like following. This trigger is for illustrative
> purposes; conditions for filtering are more complex.
>
> create or replace trigger emp_aftins
> after INSERT ON employee
> for each row
>
> declare
> PRAGMA AUTONOMOUS_TRANSACTION;
> BEGIN
>
> if (:new.name is null) then
> dbms_output.put_line(:new.wwid || 'name' || :new.name);
> rollback;
> else
> commit;
> end if;
>
> END;
> /
>
> I was hoping that when I do rollback that row will not be inserted. I
> found that
> Dbms_output before rollback is exceuted, then rollback is exceuted,
> yet row is being inserted.
>
> If I try to delete a row instead of rollback, I get mutating table
> error.
>
> Appreciate any help.
>
>
> Thanks a lot.

All that work for nothing. <g>

Why not just put a NOT NULL constraint on the column? Then use the EXCEPTIONS INTO to trap the violating rows.

You will find a demo here for a PK but it works the same for a check constraint.
http://www.psoug.org/reference/constraints.html#cpc

-- 
Daniel A. Morgan
Oracle Ace Director & Instructor
University of Washington
damorgan_at_x.washington.edu (replace x with u to respond)
Puget Sound Oracle Users Group
www.psoug.org