On Tue, Oct 5, 2010 at 18:41, Tom Lane <tgl@xxxxxxxxxxxxx> wrote: > Peter Geoghegan <peter.geoghegan86@xxxxxxxxx> writes: >> On 5 October 2010 16:33, Greg Sabino Mullane <greg@xxxxxxxxxxxx> wrote: >>>> How does the driver figure it out? >>> >>> DBD::Pg parses pg_config --version, then passes the information >>> to the C programs for directive fiddling. I certainly hope >>> other drivers are doing the same, as libpq varies across >>> major versions a good deal. > >> I would imagine that most libpq wrapping drivers use libpq's >> PQserverVersion(), which returns an integer that looks like 90000. > > The real problem is that neither of these can be trusted to tell you the > *library* version. PQserverVersion() is something else altogether, > and I wouldn't want to assume that pg_config exactly matches the library > you're linked to --- if it's even present at all. > > We could add a PQlibpqVersion(), maybe, but it would be many years > before client code could rely on that being present. I think we should. And in a small way they can already - if they check for it dynamically, they'll know if it was 9.1 or newer at least :-) It'll be a long time before it's *easy* to use though. But if we don't add it now, it'll be even longer... -- Magnus Hagander Me: http://www.hagander.net/ Work: http://www.redpill-linpro.com/ -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
