You can use either. For new projects, you should probably use jdbc4 because it might implement more functionality. On Tue, 2007-05-08 at 11:36 -0400, Jack Yu wrote: > Hi All, > > > > I’m trying to use the jdbc jar file from PGSQL, but I found two of > them, > > 1) postgresql-8.2-505.jdbc3.jar > > 2) postgresql-8.2-505.jdbc4.jar > > > > I have java sdk 1.6 now, which one should I use? > > > > Thanks. > > > >