Re: Is it possible to redirect an update/insert/delete to a different table?

Hello Jaime,

I'm still not quite clear.

Say I have a number of different updates on a table 'apples' in my code,
including:

UPDATE apples set pips=6 and color='yellow' where id=3;
UPDATE apples set size=10 where id=6;

What would a rule look like which, when *any* update is attempted on the
apples table, will instead apply the update to a different table - 'pears'.

I get this far:

CREATE rule pears_instead_of_apples
AS ON UPDATE TO apples
DO INSTEAD UPDATE INTO pears .....;

What do I put where the ..... is, so that the rule will transparently update
the pears table with whatever values happened to be defined by the original
update command? Is there a special keyword that I've missed?

Regards,
Andy Ballingall

-----Original Message-----
From: Jaime Casanova [mailto:systemguards(at)gmail(dot)com]
Sent: 20 November 2005 14:23
To: andy(at)areyoulocal(dot)co(dot)uk
Cc: pgsql-sql(at)postgresql(dot)org
Subject: Re: Is it possible to redirect an update/insert/delete to a
different table?

> I've looked through rules, and as far as I can make out, they are only
> useful for explicit actions. I'm looking for something that behaves as
> though it simply substitutes the table name for a different table name
> before executing the command, no matter what the command looks like.
>

Make 3 rules (INSERT/UPDATE/DELETE), 4 if you want SELECT as well...

--
regards,
Jaime Casanova
(DBA: DataBase Aniquilator ;)

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