Rails migrations in non-Rails (and non Ruby) projects.
For this code to work you need Ruby, Gems, ActiveRecord, Rake and a suitable database driver installed.
Install Ruby, RubyGems then: sudo gem install standalone_migrations
Add to Rakefile in your projects base directory:
begin
require 'standalone_migrations'
StandaloneMigrations.tasks
rescue LoadError
puts 'gem install standalone_migrations to get db:migrate:* tasks!'
end
Add database configuration to config/database.yml in your projects base directory e.g.:
development:
adapter: mysql
encoding: utf8
reconnect: false
database: somedatabase_dev
pool: 5
username: root
password:
socket: /var/run/mysqld/mysqld.sock
test:
...something similar...
To create a new database migration run:
rake db:new_migration name=FooBarMigration
edit migrations/20081220234130_foo_bar_migration.rb
and fill in the up and down migrations. To apply your newest migration
rake db:migrate
To migrate to a specific version (for example to rollback)
rake db:migrate VERSION=20081220234130
To migrate a specific database (for example your "testing" database)
rake db:migrate RAILS_ENV=test
This work is based on Lincoln Stoll's blog post: http://lstoll.net/2008/04/stand-alone-activerecord-migrations/
and David Welton's post http://journal.dedasys.com/2007/01/28/using-migrations-outside-of-rails
A good source to learn how to use migrations is:
http://dizzy.co.uk/ruby_on_rails/cheatsheets/rails-migrations
or if you're lazy and want to just execute raw SQL
def self.up
execute "insert into foo values (123,'something');"
end
def self.down
execute "delete from foo where field='something';"
end