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Re: [snafu] isolation-level change in 2.4.2

From: Federico Di Gregorio <fog(at)dndg(dot)it>
To: Daniele Varrazzo <daniele(dot)varrazzo(at)gmail(dot)com>
Cc: Marko Kreen <markokr(at)gmail(dot)com>, psycopg ML <psycopg(at)postgresql(dot)org>
Subject: Re: [snafu] isolation-level change in 2.4.2
Date: 2011-12-15 13:01:02
Message-ID: (view raw, whole thread or download thread mbox)
Lists: psycopg
On 15/12/11 13:55, Daniele Varrazzo wrote:
> First note: even if currently postgres behaviour is the same at levels
> read committed and read uncommitted, they are still two distinct
> levels:
>      test=>  set default_transaction_isolation = 'read uncommitted';
>      SET
>      test=>  SHOW default_transaction_isolation;
>       default_transaction_isolation
>      -------------------------------
>       read uncommitted
>      (1 row)
> I think psycopg shouldn't assume the two being equivalent, otherwise
> in the event they will become different in future postgres versions we
> would have older psycopg version not supporting them. Doing it now
> doesn't cost anything.
> I've also just noted that the check for pg version not supporting
> levels UNC/REPREAD is in two different points (unfortunately
> set_session and set_isolation_level have no common code path).
> I've made a patch against these points, but I'll be able to run the
> complete test grid only this evening.



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