| From: | Fabien COELHO <coelho(at)cri(dot)ensmp(dot)fr> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Simon Riggs <simon(at)2ndquadrant(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: [COMMITTERS] pgsql: Add psql variables showing server version and psql version. |
| Date: | 2017-09-05 19:01:25 |
| Message-ID: | alpine.DEB.2.20.1709052059210.17848@lancre |
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| Lists: | pgsql-committers pgsql-hackers |
>> 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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