Re: [HACKERS] Mixing library versions

> On Wed, Nov 04, 1998 at 12:09:21AM +0000, Oliver Elphick wrote:
> > I'm currently experimenting with the Debian packaging of 6.4.
> >
> > The question arises of how to handle the change in library versions from
> > 1.0 to 2.0. It has been suggested that I should keep libpq.so.1 around
> > for the benefit of those who need to communicate with an older database
> > server.
> >
> > Is it possible to use libpq.so.2.0 to query a remote database whose
> > server is running PostgreSQL 6.3? What would be the consequences of
>
> No. Let's just try /usr/local/pgsql/bin/psql(6.4) on my running 6.3 server:
>
> Connection to database 'mm' failed.
> Unsupported frontend protocol.
>
> > using libpq.so.1 to query a 6.4 server?
>
> Never tried that until now. But it appears to work. I hvae no idea though
> where it could break things.

2.0 and 1.0 libpq can connect to 6.4, but 2.0 libpq can not connect to
older databases. In other words, the backend can communicate with old
libpq, but old backends can not communicate with 2.0 libpq.

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