| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Simon Riggs <simon(at)2ndquadrant(dot)com> |
| Cc: | 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 18:23:03 |
| Message-ID: | 8505.1504635783@sss.pgh.pa.us |
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| Lists: | pgsql-committers pgsql-hackers |
I wrote:
> 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
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.
regards, tom lane
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