Rails无法使用mysql生成模型

Question

Windows XP with installed MYSQL as a development machine, ruby 1.9.2p290 (2011-07-09) [i386-mingw32], Rails 3.1.0 gem install mysql2 -- '--with-mysql-lib="c:\\Program Files\\MySQL\\MySQL S erver 5.5\\lib" --with-mysql-include="c:\\Program Files\\MySQL\\MySQL Server 5.5\\inc lude"' (successfully installed gem mysql2) rails new talk -d mysql (successfully created a new rails app called talk)

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PROBLEM NOW STARTS:

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C:\\Sites\\RP\\talk>rails generate User ERROR MESSAGE: ruby.exe-Unable to Locate Component This application has failed to start because libmysql.dll was not found. Re-installing the application may fix this problem. COMMAND LINE ERROR MESSAGE: C:/RailsInstaller/Ruby1.9.2/lib/ruby/gems/1.9.1/gems/mysql2-0.3.10/lib/mysql2.rb :9:in require': 126: The specified module could not be found. - C:/RailsInsta ller/Ruby1.9.2/lib/ruby/gems/1.9.1/gems/mysql2-0.3.10/lib/mysql2/mysql2.so (Load Error) from C:/RailsInstaller/Ruby1.9.2/lib/ruby/gems/1.9.1/gems/mysql2-0.3.10/ lib/mysql2.rb:9:in require': 126: The specified module could not be found. - C:/RailsInsta ller/Ruby1.9.2/lib/ruby/gems/1.9.1/gems/mysql2-0.3.10/lib/mysql2/mysql2.so (Load Error) from C:/RailsInstaller/Ruby1.9.2/lib/ruby/gems/1.9.1/gems/mysql2-0.3.10/ lib/mysql2.rb:9:in ' from C:/RailsInstaller/Ruby1.9.2/lib/ruby/gems/1.9.1/gems/bundler-1.0.18 /lib/bundler/runtime.rb:68:in require' from C:/RailsInstaller/Ruby1.9.2/lib/ruby/gems/1.9.1/gems/bundler-1.0.18 /lib/bundler/runtime.rb:68:in block (2 levels) in require' from C:/RailsInstaller/Ruby1.9.2/lib/ruby/gems/1.9.1/gems/bundler-1.0.18 /lib/bundler/runtime.rb:66:in each' from C:/RailsInstaller/Ruby1.9.2/lib/ruby/gems/1.9.1/gems/bundler-1.0.18 /lib/bundler/runtime.rb:66:in block in require' from C:/RailsInstaller/Ruby1.9.2/lib/ruby/gems/1.9.1/gems/bundler-1.0.18 /lib/bundler/runtime.rb:55:in each' from C:/RailsInstaller/Ruby1.9.2/lib/ruby/gems/1.9.1/gems/bundler-1.0.18 /lib/bundler/runtime.rb:55:in require' from C:/RailsInstaller/Ruby1.9.2/lib/ruby/gems/1.9.1/gems/bundler-1.0.18 /lib/bundler.rb:120:in require' from C:/Sites/RP/talk/config/application.rb:9:in require' from C:/Sites/RP/talk/config/application.rb:9:in ' from C:/RailsInstaller/Ruby1.9.2/lib/ruby/gems/1.9.1/gems/railties-3.1.0 /lib/rails/commands.rb:21:in require' from C:/RailsInstaller/Ruby1.9.2/lib/ruby/gems/1.9.1/gems/railties-3.1.0 /lib/rails/commands.rb:21:in ' from script/rails:6:in require' from script/rails:6:in '

Answer 1

http://www.ruby-forum.com/topic/150580 has the answer. for some reason I need to:

1/ gem install mysql 2/ copy the libmysql.dll file from /MYSQL/MySQL Server 5.5/lib and paste it to Ruby1.9.2/bin

after that, it is smooth sailing...

Even though I did it, I would appreciate if anyone has an insight into the reason behind this:

Answer 2

On windows there should be a LIB environment variable. Have you checked to make sure that the path to libmysql has been added to this? I suspect it hasn't.