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Re: Error handling in plperl and pltcl

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Thomas Hallgren <thhal(at)mailblocks(dot)com>
Cc: Richard Huxton <dev(at)archonet(dot)com>,Jan Wieck <JanWieck(at)Yahoo(dot)com>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: Error handling in plperl and pltcl
Date: 2004-11-30 20:33:23
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
Thomas Hallgren <thhal(at)mailblocks(dot)com> writes:
>  From your statement it sounds like you want to use the subtransactions 
> solely in a hidden mechanism and completely remove the ability to use 
> them from the function developer. Is that a correct interpretation?

No; I would like to develop the ability to specify savepoints in pltcl
and plperl, so that already-executed SPI commands can be rolled back at
need.  But that is a feature for later --- it's way too late to think
about it for 8.0.  Moreover, having that will not remove the requirement
for the state after catching a SPI error to be sane.

The fundamental point you are missing, IMHO, is that a savepoint is a
mechanism for rolling back *already executed* SPI commands when the
function author wishes that to happen.  A failure in an individual
command should not leave the function in a broken state.

			regards, tom lane

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