还是在 windows 上，最后可以了，只是我中间装过 devkit，然后缺的的 gem 包也都一一 gem install xxx 了

控制台执行 rake db:migrate 后出现这样的错误 rake aborted! Unrecognized --trace option 'race' C:/Ruby187/lib/ruby/gems/1.8/gems/rake-10.0.3/lib/rake/application.rb:508:in se lect_trace_output' C:/Ruby187/lib/ruby/gems/1.8/gems/rake-10.0.3/lib/rake/application.rb:466:inst andard_rake_options' C:/Ruby187/lib/ruby/1.8/optparse.rb:1298:in call' C:/Ruby187/lib/ruby/1.8/optparse.rb:1298:inparse_in_order' C:/Ruby187/lib/ruby/1.8/optparse.rb:1254:in catch' C:/Ruby187/lib/ruby/1.8/optparse.rb:1254:inparse_in_order' C:/Ruby187/lib/ruby/1.8/optparse.rb:1248:in order!' C:/Ruby187/lib/ruby/1.8/optparse.rb:1339:inpermute!' C:/Ruby187/lib/ruby/1.8/optparse.rb:1360:in parse!' C:/Ruby187/lib/ruby/gems/1.8/gems/rake-10.0.3/lib/rake/application.rb:518:inha ndle_options' C:/Ruby187/lib/ruby/gems/1.8/gems/rake-10.0.3/lib/rake/application.rb:81:in ini t' C:/Ruby187/lib/ruby/gems/1.8/gems/rake-10.0.3/lib/rake/application.rb:160:inst andard_exception_handling' C:/Ruby187/lib/ruby/gems/1.8/gems/rake-10.0.3/lib/rake/application.rb:79:in ini t' C:/Ruby187/lib/ruby/gems/1.8/gems/rake-10.0.3/lib/rake/application.rb:71:inrun ' C:/Ruby187/lib/ruby/gems/1.8/gems/rake-10.0.3/lib/rake/application.rb:160:in st andard_exception_handling' C:/Ruby187/lib/ruby/gems/1.8/gems/rake-10.0.3/lib/rake/application.rb:70:inrun ' C:/Ruby187/lib/ruby/gems/1.8/gems/rake-10.0.3/bin/rake:33 C:/Ruby187/bin/rake:23:in `load' C:/Ruby187/bin/rake:23

1 楼的意思是，用 sql 语句自己创建数据库表？

数据库连接是正确的