官方网站：http://sequel.rubyforge.org/
其他资料：
http://www.javaeye.com/news/8676-sequel-3-2-0-release
http://www.javaeye.com/wiki/ruby_off_rails/1522-sequel-better-than-activerecord-the-ruby-database-toolkit
http://www.infoq.com/cn/news/2008/12/sequel-ruby-db-toolkit
