| From: | Chris Jones <chris(at)mt(dot)sri(dot)com> |
|---|---|
| To: | drevil(at)sidereal(dot)kz |
| Cc: | pgsql-general(at)postgresql(dot)org |
| Subject: | Re: How to use locks, for DB noivces? |
| Date: | 2001-03-09 21:52:11 |
| Message-ID: | 20010309145211.N27501@mt.sri.com |
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| Lists: | pgsql-general |
On Fri, Mar 09, 2001 at 09:12:55PM -0000, drevil(at)sidereal(dot)kz wrote:
> I need this so that there isn't a race condition. Ie, if there are
> $10 in the account, and one backen says "withdraw $9" and the other
> also says "withdraw $9" at the same time, I need to make sure they
> they don't execute at the same time, which would result in a negative
> balance.
In theory, you could also make a CHECK condition for that column that
would throw an exception if the balance goes negative. Depending on
how your code is written, that might be easier or tougher.
Chris
--
chris(at)mt(dot)sri(dot)com -----------------------------------------------------
Chris Jones SRI International, Inc.
www.sri.com
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