From: Tom Lane <tgl@sss.pgh.pa.us>
To: rodrigo.sakai@zanthus.com.br
Cc: pgsql-interfaces@postgresql.org
Subject: Re: RES: Creating a new type
Date: Thu, 29 Jun 2006 09:47:00 -0400
Message-ID: <20097.1151588820@sss.pgh.pa.us> (raw)
In-Reply-To: <000001c69b78$e5cfcee0$4700a8c0@TREEZANTHUS>
References: <000001c69b78$e5cfcee0$4700a8c0@TREEZANTHUS>
"Rodrigo Sakai" <rodrigo.sakai@zanthus.com.br> writes:
> So, I have to guarantee that this situation doesn't occur! But I don't
> want to use triggers because this check must be done on almost all tables
> that uses the type:
The fact that you don't want to do it doesn't make it the wrong
solution ;-)
At the moment there is no other way than a trigger. There's been some
speculation about whether GIST indexes could be extended to enforce
conditions like "no overlapping values in this column" (as a
generalization of the concept of unique indexes). No one's tried to
make that happen, though.
BTW, you might want to look at the "timetravel" code in contrib/spi/
... it's a tad old and crufty, but it sounds like you are trying to do
something pretty similar to that.
regards, tom lane
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To: pgsql-interfaces@postgresql.org
Cc: tgl@sss.pgh.pa.us, rodrigo.sakai@zanthus.com.br
Subject: Re: RES: Creating a new type
In-Reply-To: <20097.1151588820@sss.pgh.pa.us>
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