This gem gives you the ability to query JDBC connections with RDBI.
> gem install rdbi-driver-jdbc
> irb
> require 'rdbi-driver-jdbc'
> dbh = RDBI.connect :JDBC, :db => "MY_DSN", :user => "USERNAME",
* :password => "PASSWORD"
> rs = dbh.execute "SELECT * FROM MY_TABLE"
> rs.as(:Struct).fetch(:first)
Copyright (c) 2011 Shane Emmons. See LICENSE for details.