From: | Matt Miller <mattm(at)epx(dot)com> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | pgsql-general <pgsql-general(at)postgresql(dot)org> |
Subject: | Re: PL/pgSQL: EXCEPTION NOSAVEPOINT |
Date: | 2005-09-01 22:14:55 |
Message-ID: | 1125612895.3636.47.camel@dbamm01-linux |
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Lists: | pgsql-general pgsql-hackers pgsql-patches |
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On Wed, 2005-08-03 at 16:25 -0400, Tom Lane wrote:
> Matt Miller <mattm(at)epx(dot)com> writes:
> > allow a PL/pgSQL exception to not automatically rollback
> > the work done by the current block.
>
> This fundamentally breaks the entire backend. You do not have the
> option to continue processing after elog(ERROR);
Okay, I think I'm beginning to see the naivete of that patch's
simplistic attempt to decouple backend error handling from transaction
management. But I still haven't found a way to meet my original need:
On Wed, 2005-08-03 at 19:58 +0000, Matt Miller wrote:
> The benefit is that [PL/pgSQL] exception
> handling can be used as a program flow control technique, without
> invoking transaction management mechanisms. This also adds additional
> means to enhanced Oracle PL/SQL compatibility.
Basically I'd like my Pl/pgSQL code to be able to utilize the try/catch
paradigm of error handling without the overhead of subtransactions and
without the effect of a rollback. If I catch the exception then
everything should be fine as far as the transaction is concerned. If
don't catch the exception, or if I re-raise it, then the enclosing block
can decide to rollback. This is more consistent with Oracle, and I have
hundreds of Oracle procs to convert across multiple databases.
I'm still thinking that some kind of hack to
src/pl/plpgsql/src/pl_exec.c is probably where I'm headed, but I'm open
to consider other approaches/advice.
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