不带Rails的ActiveRecord请安装mysql2适配器

我正在尝试使用ruby和ActiveRecord访问mysql数据库。ruby文件是dbtest.rb

require 'rubygems'
require 'active_record'  
ActiveRecord::Base.establish_connection(  
  :adapter => "mysql2",  
  :host => "localhost",  
  :database => "students"  
)  

class Rubyist < ActiveRecord::Base  
end  

我已经成功安装了mysql2 gem和activerecord-mysql2-adapter。当我安装activerecord-mysql2-adapter时，我收到以下消息：

gem install activerecord-mysql2-adapter
Fetching: activerecord-mysql2-adapter-0.0.3.gem (100%)
Successfully installed activerecord-mysql2-adapter-0.0.3
1 gem installed

---

我需要重命名适配器吗？

我在我的.bash\u配置文件中添加了“export DYLD\u LIBRARY\u PATH=/usr/local/mysql/lib:$DYLD\u LIBRARY\u PATH”，该文件修复了适配器。

请运行“bundle update”。我没有使用Rails，因此我没有Gemfile，bundle也不需要Gemfile？

gem install activerecord-mysql2-adapter
Fetching: activerecord-mysql2-adapter-0.0.3.gem (100%)
Successfully installed activerecord-mysql2-adapter-0.0.3
1 gem installed