From: Peter Eisentraut <peter_e@gmx.net>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: pgsql-sql@postgresql.org
Subject: Re: Database system identifier from SQL
Date: Tue, 10 Jul 2007 20:06:10 +0200
Message-ID: <200707102006.11643.peter_e@gmx.net> (raw)
In-Reply-To: <20025.1184080999@sss.pgh.pa.us>
References: <200707101624.47885.peter_e@gmx.net>
<20025.1184080999@sss.pgh.pa.us>
Tom Lane wrote:
> Peter Eisentraut <peter_e@gmx.net> writes:
> > Is there a way to query the database system identifier that
> > pg_controldata outputs from SQL?
>
> Don't think so. Do you have a use-case for providing a function to
> return that?
I'd like to find out whether two connections are really to the same
server.
This is in the context of an installation routine for a database
application which pulls the connection parameters for several databases
from a configuration file and creates various things there. It should,
however, only create roles once if the connection parameters point to
the same server (if the user only expects a small installation, say).
A workaround is to compare inet_server_addr() and inet_server_port(),
but that is not 100% safe because it doesn't cover Unix-domain sockets
using different paths.
--
Peter Eisentraut
http://developer.postgresql.org/~petere/
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To: pgsql-sql@postgresql.org
Cc: peter_e@gmx.net, tgl@sss.pgh.pa.us
Subject: Re: Database system identifier from SQL
In-Reply-To: <200707102006.11643.peter_e@gmx.net>
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