From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | Rahila Syed <rahilasyed90(at)gmail(dot)com>, Daniel Verite <daniel(at)manitou-mail(dot)org>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: Surprising behaviour of \set AUTOCOMMIT ON |
Date: | 2016-09-15 15:28:44 |
Message-ID: | CA+TgmoYvtXrOK7UFBVKKKPdRSLTtAOztxoj3wDJ0zRbGN-8tQg@mail.gmail.com |
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Lists: | pgsql-hackers |
On Thu, Sep 15, 2016 at 11:10 AM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Robert Haas <robertmhaas(at)gmail(dot)com> writes:
>> On Thu, Sep 15, 2016 at 7:29 AM, Rahila Syed <rahilasyed90(at)gmail(dot)com> wrote:
>>> In keeping with current design of hooks instead of rejecting autocommit 'ON'
>>> setting inside
>>> a transaction,the value can be set to 'ON' with a psql_error displaying that
>>> the value
>>> will be effective when the current transaction has ended.
>
>> Hmm, that seems like a reasonable compromise.
>
> I dunno, implementing that seems like it will require some very fragile
> behavior in the autocommit code, ie that even though the variable is "on"
> we don't do anything until after reaching an out-of-transaction state.
> It might work today but I'm afraid we'd break it in future.
Hmm, I don't think any logic change is being proposed, just a warning
that it may not work the way you think. So I don't think it would be
any more fragile than now. Am I missing something?
> I think changing the hook API is a pretty reasonable thing to do here
> (though I'd make it its own patch and then add the autocommit change
> on top). When was the last time you actually wanted to set VERBOSITY
> to "fubar"?
I agree that'd be better but I don't know that we should expect Rahila
to do that as a condition of getting a usability warning accepted.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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