From: Fabien COELHO <coelho@cri.ensmp.fr>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Simon Riggs <simon@2ndquadrant.com>
Cc: Robert Haas <robertmhaas@gmail.com>
Cc: pgsql-hackers@postgresql.org <pgsql-hackers@postgresql.org>
Subject: Re: [COMMITTERS] pgsql: Add psql variables showing server version and psql version.
Date: Tue, 5 Sep 2017 21:01:25 +0200 (CEST)
Message-ID: <alpine.DEB.2.20.1709052059210.17848@lancre> (raw)
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>> Huh? The variable will be set in any case. It should be correct for any
>> server version we might find in the wild --- so far as I can tell from the
>> commit history, every version supporting FE/BE protocol version 3 has sent
>> server_version at connection start. With a pre-7.4 server, it looks like
>> the variables would be set to "0.0.0" and "0" respectively.
>
> Scratch that: experimentation says it works fine with older servers too.
> The oldest one I have in captivity reports
Ok, be it means a recent psql connecting to an old server. It does not
work with an old psql.
> SERVER_VERSION_NAME = '7.0.3'
> SERVER_VERSION_NUM = '70003'
>
> Looking more closely, I see that when using protocol version 2, libpq
> will issue a "select version()" command at connection start to get
> this info.
Then it could be used for free to set SERVER_VERSION if it can be
extracted from libpq somehow?!
--
Fabien.
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Cc: coelho@cri.ensmp.fr, tgl@sss.pgh.pa.us, simon@2ndquadrant.com, robertmhaas@gmail.com
Subject: Re: [COMMITTERS] pgsql: Add psql variables showing server version and psql version.
In-Reply-To: <alpine.DEB.2.20.1709052059210.17848@lancre>
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