User based access

Hi all,

Would I be correct in saying that there is no way to allow a few users to
have access to a database, but deny others, under Postgresql?

I have scoured the documentation (which draws a blank) and have looked
through other similar questions to this mailing list (which all seem to
have gone unanswered).

I'm not having any problems creating users, or using the pg_hba.conf -
all I want to do is prevent some postgres users from accessing certain
databases...

Cheers,

Paul.

--
Paul Dwerryhouse                                        paul@xenu.ee.mu.oz.au
"The growing use of e-mail, not to mention Web-page publishing, threatens to
reverse the trend towards illiteracy among the supposedly educated without at
the same time improving their spelling". -- Michael Swaine, Dr. Dobb's Journal