RE: Elementary question about triggers

You could use VPD (virtual private database, AKA fine-grained access control AKA row-level security) to control exactly which rows a given user can delete based on a function using the business rule which determines which rows they are authorized to delete. This works from 8i onward, but there are some nasty 'gotchas', so it shouldn't be done casually (example: use of VPD on a table without authorizing SYSTEM to select from all rows can result in the rows of the table not getting exported).

Regards,
Chris Gait

On 15 Oct 2002, at 1:10, Charu Joshi wrote:

Date sent:      	Tue, 15 Oct 2002 01:10:50 -0800
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> It is meant to be a 'selective' deletion i.e. some rows should be allowed to
> delete where as others shouldn't be. Thanks for your replies.
>
> Regards,
> Charu.
>
> -----Original Message-----
> Sent: Monday, October 14, 2002 8:30 PM
> To: Multiple recipients of list ORACLE-L
>
> Why not just remove delete authority from anyone not authorized to delete
> from it ??
>
> -----Original Message-----
> Sent: Monday, October 14, 2002 2:34 PM
> To: Multiple recipients of list ORACLE-L
>
> CREATE OR REPLACE TRIGGER temp_trig BEFORE DELETE ON temp_tab FOR EACH ROW
> BEGIN
> RAISE_APPLICATION_ERROR(-20000,'Do not delete ...');
> END;
> /
>
> Bala.
> -----Original Message-----
> Sent: Monday, October 14, 2002 1:14 PM
> To: Multiple recipients of list ORACLE-L
>
> Dear Listers,
>
> I hope you won't mind a question that (I think) looks unfit for this list:
>
> "Can we prevent a delete trigger from deleting a row?"
>
> To make it clear, here's the code for a trigger:
>
> CREATE OR REPLACE TRIGGER temp_trig BEFORE DELETE ON temp_tab FOR EACH ROW
>
> ???
>
> END;
>
> What statement should I write in the PL/SQL block, that will prevent the
> deletion of the row.
>
> Thanks & regards,
> Charu.
>
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