jdbc-postgres
PostgreSQL JDBC driver allows Java programs to connect to a PostgreSQL database using standard, database independent Java code - it's a pure Java (Type 4) impl.
For more information see http://jdbc.postgresql.org/
Usage
To make the driver accessible to JDBC and ActiveRecord code running in JRuby :
require 'jdbc/postgres'
Jdbc::Postgres.load_driver
For backwards compatibility with older (<= 9.1.903) versions of the gem use :
require 'jdbc/postgres'
Jdbc::Postgres.load_driver(:require) if Jdbc::Postgres.respond_to?(:load_driver)
Copyright
Copyright (c) 2012-2014 The JRuby Team.
The PostgreSQL JDBC driver is distributed under the BSD license, see LICENSE.txt and http://jdbc.postgresql.org/license.html for details.