From: Alvaro Herrera <alvherre@commandprompt.com>
To: Joshua Tolley <eggyknap@gmail.com>
Cc: Glenn Maynard <glenn@zewt.org>
Cc: Richard Huxton <dev@archonet.com>
Cc: pgsql-sql@postgresql.org
Subject: Re: Bit by "commands ignored until end of transaction block" again
Date: Fri, 24 Jul 2009 12:54:31 -0400
Message-ID: <20090724165431.GB15591@alvh.no-ip.org> (raw)
In-Reply-To: <20090723064656.GO25450@eddie>
References: <bd36f99e0907222158k6b4b3a0al65766c0d9c4906cf@mail.gmail.com>
<4A67F5B6.4080409@archonet.com>
<bd36f99e0907222304x38cfa50bkeba19f7c9b2694@mail.gmail.com>
<20090723064656.GO25450@eddie>
Joshua Tolley escribió:
> Have you tried this? I expect if you give it a shot, you'll find you don't
> actually have this problem. Really, everything is always in a transaction. If
> you haven't explicitly opened one, PostgreSQL opens one for you before each
> statement, and issues a COMMIT afterwards (or a ROLLBACK, if your statement
> ran into an error). Statements within functions are always executed within the
> same transaction, so you can issue SAVEPOINT commands anywhere in PL/pgSQL
> functions without problems, because you're always in a transaction.
No, actually you can't call SAVEPOINT inside a PL/pgSQL function (or any
SPI user for that matter -- have you tried savepoints in LOLCODE?)
Inside PL/pgSQL the only way to use savepoints is with EXCEPTION blocks.
You are correct that you're always in a transaction, but in this context
not all transactions are equal :-(
(The problem, as we found out, is that the function must always have
control at the same level of transaction nestedness in SPI; you can't
just let the user define and release savepoints arbitrarily.)
--
Alvaro Herrera http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.
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To: pgsql-sql@postgresql.org
Cc: alvherre@commandprompt.com, eggyknap@gmail.com, glenn@zewt.org, dev@archonet.com
Subject: Re: Bit by "commands ignored until end of transaction block" again
In-Reply-To: <20090724165431.GB15591@alvh.no-ip.org>
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