activerecord-jdbc-adapter is a database adapter for Rails' ActiveRecord component that can be used with JRuby. It allows use of virtually any JDBC-compliant database with your JRuby on Rails application.
- Mailing Lists: http://kenai.com/projects/activerecord-jdbc/lists
- Issues: http://kenai.com/jira/browse/ACTIVERECORD_JDBC
What's there, and what is not there:
- MySQL - Complete support
- PostgreSQL - Complete support
- Oracle - Complete support
- Microsoft SQL Server - Complete support except for change_column_default
- DB2 - Complete, except for the migrations:
- FireBird - Complete, except for change_column_default and rename_column
- Derby - Complete, except for:
- HSQLDB - Complete
- H2 - Complete
- SQLite3 - work in progress
- Informix - Fairly complete support, all tests pass and migrations appear to work. Comments welcome.
Other databases will require testing and likely a custom configuration module. Please join the mailing lists to help us discover support for more databases.
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 (activerecord-jdbc-adapter). Supports all available databases via JDBC, but requires you to download and manually install the database vendor's JDBC driver .jar file.
- mysql (activerecord-jdbcmysql-adapter)
- postgresql (activerecord-jdbcpostgresql-adapter)
- derby (activerecord-jdbcderby-adapter)
- hsqldb (activerecord-jdbchsqldb-adapter)
- h2 (activerecord-jdbch2-adapter)
2. Run the "jdbc" generator to prepare your Rails application for JDBC.
jruby script/generate jdbc
The initializer and rake task files generated are guarded such that they won't be loaded if you still run your application un C Ruby.
Legacy: If you're using Rails prior to version 2.0, you'll need to add one-time setup to your config/environment.rb file in your Rails application. Add the following lines just before the
Rails::Initializer. (If you're using activerecord-jdbc-adapter under the old gem name used in versions 0.5 and earlier (ActiveRecord-JDBC), replace 'activerecord-jdbc-adapter' with 'ActiveRecord-JDBC' below.)
if RUBY_PLATFORM =~ /java/ require 'rubygems' gem 'activerecord-jdbc-adapter' require 'jdbc_adapter' end
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 databas 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
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. If using ActiveRecord 2.0 (Rails 2.0) or greater, you can skip to the next step. Otherwise, ensure the following code gets executed in your script:
require 'rubygems' gem 'activerecord-jdbc-adapter' require 'jdbc_adapter' require 'active_record'
3. 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' )
The source for activerecord-jdbc-adapter is available using git.
git clone git://github.com/nicksieger/activerecord-jdbc-adapter.git
Drivers for 6 open-source databases are included. Provided you have MySQL installed, you can simply type jruby -S rake to run the tests. A database named weblog_development is needed beforehand with a connection user of "blog" and an empty password.
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 weblog_development 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:
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
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.
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.