install mysql2 gem for Rails 3

引用

http://stackoverflow.com/questions/3608287/installing-mysql2-gem-for-rails-3
https://github.com/brianmario/mysql2

sudo apt-get install libmysql-ruby libmysqlclient-dev
gem install mysql2

vi Gemfile

gem 'mysql2', '< 0.3'

执行bundle

bundle install

vi config/datebase.yml

env:
  adapter: mysql2
  database: ***
  username: ***
  password: ***
  host: localhost
  encoding: utf8