Re: pgsql: Add psql variables showing server version and psql version.

On 5 September 2017 at 07:51, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Add psql variables showing server version and psql version.
>
> We already had a psql variable VERSION that shows the verbose form of
> psql's own version. Add VERSION_NAME to show the short form (e.g.,
> "11devel") and VERSION_NUM to show the numeric form (e.g., 110000).
> Also add SERVER_VERSION_NAME and SERVER_VERSION_NUM to show the short and
> numeric forms of the server's version. (We'd probably add SERVER_VERSION
> with the verbose string if it were readily available; but adding another
> network round trip to get it seems too expensive.)
>
> The numeric forms, in particular, are expected to be useful for scripting
> purposes, now that psql can do conditional tests.

This is good.

Please can we backpatch these are far as they will go (easily)?

There is very little risk in doing so and significant benefits in
being able to rely on scripts that know about versions.

Thanks

--
Simon Riggs http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services