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Add psql variables showing server version and psql version.

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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.

Back-patch of commit 9ae9d8c154.

Fabien Coelho, reviewed by Pavel Stehule

Discussion: https://postgr.es/m/alpine.DEB.2.20.1704020917220.4632@lancre
This commit is contained in:
Tom Lane
2017-09-06 11:35:31 -04:00
parent 483882905a
commit a6c678f018
4 changed files with 50 additions and 3 deletions
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24
doc/src/sgml/ref/psql-ref.sgml
View File

@ -3670,6 +3670,21 @@ bar
</listitem>
</varlistentry>
<varlistentry>
<term><varname>SERVER_VERSION_NAME</varname></term>
<term><varname>SERVER_VERSION_NUM</varname></term>
<listitem>
<para>
The server's version number as a string, for
example <literal>9.6.2</>, <literal>10.1</> or <literal>11beta1</>,
and in numeric form, for
example <literal>90602</> or <literal>100001</>.
These are set every time you connect to a database
(including program start-up), but can be changed or unset.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>SHOW_CONTEXT</varname></term>
<listitem>
@ -3733,10 +3748,15 @@ bar
<varlistentry>
<term><varname>VERSION</varname></term>
<term><varname>VERSION_NAME</varname></term>
<term><varname>VERSION_NUM</varname></term>
<listitem>
<para>
This variable is set at program start-up to
reflect <application>psql</>'s version. It can be changed or unset.
These variables are set at program start-up to reflect
<application>psql</>'s version, respectively as a verbose string,
a short string (e.g., <literal>9.6.2</>, <literal>10.1</>,
or <literal>11beta1</>), and a number (e.g., <literal>90602</>
or <literal>100001</>). They can be changed or unset.
</para>
</listitem>
</varlistentry>