mysql - 无法加载此类文件 -- mysql/mysql_api (LoadError)

Question

我在使用 rails server 时遇到这个错误

C:/Ruby/lib/ruby/gems/2.0.0/gems/mysql-2.9.1-x86-mingw32/lib/mysql.rb:6:in `require': cannot load such file -- mysql/mysql_api (LoadError)
    from C:/Ruby/lib/ruby/gems/2.0.0/gems/mysql-2.9.1-x86-mingw32/lib/mysql.rb:6:in `rescue in <top (required)>'
    from C:/Ruby/lib/ruby/gems/2.0.0/gems/mysql-2.9.1-x86-mingw32/lib/mysql.rb:2:in `<top (required)>'
    from C:/Ruby/lib/ruby/gems/2.0.0/gems/bundler-1.5.2/lib/bundler/runtime.rb:76:in `require'
    from C:/Ruby/lib/ruby/gems/2.0.0/gems/bundler-1.5.2/lib/bundler/runtime.rb:76:in `block (2 levels) in require'
    from C:/Ruby/lib/ruby/gems/2.0.0/gems/bundler-1.5.2/lib/bundler/runtime.rb:72:in `each'
    from C:/Ruby/lib/ruby/gems/2.0.0/gems/bundler-1.5.2/lib/bundler/runtime.rb:72:in `block in require'
    from C:/Ruby/lib/ruby/gems/2.0.0/gems/bundler-1.5.2/lib/bundler/runtime.rb:61:in `each'
    from C:/Ruby/lib/ruby/gems/2.0.0/gems/bundler-1.5.2/lib/bundler/runtime.rb:61:in `require'
    from C:/Ruby/lib/ruby/gems/2.0.0/gems/bundler-1.5.2/lib/bundler.rb:131:in `require'
    from E:/ruby/config/application.rb:7:in `<top (required)>'
    from C:/Ruby/lib/ruby/gems/2.0.0/gems/railties-4.0.2/lib/rails/commands.rb:74:in `require'
    from C:/Ruby/lib/ruby/gems/2.0.0/gems/railties-4.0.2/lib/rails/commands.rb:74:in `block in <top (required)>'
    from C:/Ruby/lib/ruby/gems/2.0.0/gems/railties-4.0.2/lib/rails/commands.rb:71:in `tap'
    from C:/Ruby/lib/ruby/gems/2.0.0/gems/railties-4.0.2/lib/rails/commands.rb:71:in `<top (required)>'
    from E:/ruby/bin/rails:4:in `require'
    from E:/ruby/bin/rails:4:in `<top (required)>'
    from -e:1:in `load'
    from -e:1:in `<main>'

我通过下载mysql-controller-c安装了mysql，但它仍然报错，我将libmysql.dll复制到ruby/bin，也复制到system32，它仍然有问题，谁能给我一个解决问题的建议。

Answer 1

此 gem 没有为 Ruby-2.0 预构建的原生扩展(参见 C:\Ruby\lib\ruby\gems\2.0.0\gems\mysql-2.9.1-x86-mingw32\lib\mysql )。你必须 build it yourself或降级到 ruby​​-1.9。