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activerecord-jdbc-adapter is a database adapter for Rails' ActiveRecord component that can be used with JRuby[http://www.jruby.org/]. It allows use of virtually any JDBC-compliant database with your JRuby on Rails application. == Databases Activerecord-jdbc-adapter provides full or nearly full support for: MySQL, PostgreSQL, SQLite3, Oracle, Microsoft SQL Server, DB2, FireBird, Derby, HSQLDB, H2, and Informix. Other databases will require testing and likely a custom configuration module. Please join the activerecord-jdbc mailing-lists[http://kenai.com/projects/activerecord-jdbc/lists] to help us discover support for more databases. == Using ActiveRecord JDBC === Inside Rails To use activerecord-jdbc-adapter with JRuby on Rails: 1. Choose the adapter you wish to gem install. The following pre-packaged adapters are available: * base jdbc (<tt>activerecord-jdbc-adapter</tt>). Supports all available databases via JDBC, but requires you to download and manually install the database vendor's JDBC driver .jar file. * mysql (<tt>activerecord-jdbcmysql-adapter</tt>) * postgresql (<tt>activerecord-jdbcpostgresql-adapter</tt>) * sqlite3 (<tt>activerecord-jdbcsqlite3-adapter</tt>) * derby (<tt>activerecord-jdbcderby-adapter</tt>) * hsqldb (<tt>activerecord-jdbchsqldb-adapter</tt>) * h2 (<tt>activerecord-jdbch2-adapter</tt>) * mssql (<tt>activerecord-jdbcmssql-adapter</tt>) 2a. For Rails 3, if you're generating a new application, use the following command to generate your application: jruby -S rails new sweetapp -m http://jruby.org/rails3.rb 2b. Otherwise, you'll need to perform some extra configuration steps to prepare your Rails application for JDBC. If you're using Rails 3, you'll need to modify your Gemfile to use the activerecord-jdbc-adapter gem under JRuby. Change your Gemfile to look like the following (using sqlite3 as an example): if defined?(JRUBY_VERSION) gem 'activerecord-jdbc-adapter' gem 'jdbc-sqlite3' else gem 'sqlite3-ruby', :require => 'sqlite3' end If you're using Rails 2: jruby script/generate jdbc 3. Configure your database.yml in the normal Rails style. Legacy configuration: If you use one of the convenience 'activerecord-jdbcXXX-adapter' adapters, you can still put a 'jdbc' prefix in front of the database adapter name as below. development: adapter: jdbcmysql username: blog password: hostname: localhost database: weblog_development For other databases, you'll need to know the database driver class and URL. Example: development: adapter: jdbc username: blog password: driver: com.mysql.jdbc.Driver url: jdbc:mysql://localhost:3306/weblog_development For JNDI data sources, you may simply specify the JNDI location as follows (the adapter will be automatically detected): production: adapter: jdbc jndi: jdbc/mysqldb === Standalone, with ActiveRecord 1. Install the gem with JRuby: jruby -S gem install activerecord-jdbc-adapter If you wish to use the adapter for a specific database, you can install it directly and a driver gem will be installed as well: jruby -S gem install activerecord-jdbcderby-adapter 2. After this you can establish a JDBC connection like this: ActiveRecord::Base.establish_connection( :adapter => 'jdbcderby', :database => "db/my-database" ) or like this (but requires that you manually put the driver jar on the classpath): ActiveRecord::Base.establish_connection( :adapter => 'jdbc', :driver => 'org.apache.derby.jdbc.EmbeddedDriver', :url => 'jdbc:derby:test_ar;create=true' ) == Extending AR-JDBC You can create your own extension to AR-JDBC for a JDBC-based database that core AR-JDBC does not support. We've created an example project for the Intersystems Cache database that you can examine as a template. See the project for more information at the following URL: http://github.com/nicksieger/activerecord-cachedb-adapter == Getting the source The source for activerecord-jdbc-adapter is available using git. git clone git://github.com/nicksieger/activerecord-jdbc-adapter.git == Feedback Please file bug reports at http://kenai.com/jira/browse/ACTIVERECORD_JDBC. If you're not sure if something's a bug, feel free to pre-report it on the mailing lists. == Project Info * Mailing Lists: http://kenai.com/projects/activerecord-jdbc/lists * Issues: http://kenai.com/jira/browse/ACTIVERECORD_JDBC * Source: git://github.com/nicksieger/activerecord-jdbc-adapter.git git://kenai.com/activerecord-jdbc~main == Running AR-JDBC's Tests Drivers for 6 open-source databases are included. Provided you have MySQL installed, you can simply type <tt>jruby -S rake</tt> to run the tests. A database named <tt>weblog_development</tt> is needed beforehand with a connection user of "blog" and an empty password. You alse need to grant "blog" create privileges on 'test_rake_db_create.*'. If you also have PostgreSQL available, those tests will be run if the `psql' executable can be found. Also ensure you have a database named <tt>weblog_development</tt> and a user named "blog" and an empty password. If you want rails logging enabled during these test runs you can edit test/jdbc_common.rb and add the following line: require 'db/logger' == Running AR Tests To run the current AR-JDBC sources with ActiveRecord, just use the included "rails:test" task. Be sure to specify a driver and a path to the ActiveRecord sources. jruby -S rake rails:test DRIVER=mysql RAILS=/path/activerecord_source_dir == Authors This project was written by Nick Sieger <firstname.lastname@example.org> and Ola Bini <email@example.com> with lots of help from the JRuby community. == License activerecord-jdbc-adapter is released under a BSD license. See the LICENSE file included with the distribution for details. Open-source driver gems for activerecord-jdbc-adapter are licensed under the same license the database's drivers are licensed. See each driver gem's LICENSE.txt file for details.