Ruby：mysql2-Gem无法正常工作（Mac OS X Snow Leopard，Ruby 1.9.2） [英] Ruby: mysql2-Gem not working (Mac OS X Snow Leopard, Ruby 1.9.2)

问题描述

我刚刚编译了ruby，并安装了rubygems，mysql2和rails，这些工作非常好。但是，当我尝试启动rails服务器时，我收到以下错误消息：

$ us $ local / gems / 1.9.1 / gems / mysql2-0.2.6 / lib / mysql2.rb：7：在'require'中：dlopen（/usr/local/ruby/lib/ruby/gems/1.9.1/gems/mysql2- 0.2.6 / lib / mysql2 / mysql2.bundle，9）：未加载库：libmysqlclient.18.dylib（LoadError）
引用自：/usr/local/ruby/lib/ruby/gems/1.9.1 /gems/mysql2-0.2.6/lib/mysql2/mysql2.bundle
原因：未找到图像 - /usr/local/ruby/lib/ruby/gems/1.9.1/gems/mysql2-0.2.6 /lib/mysql2/mysql2.bundle
from /usr/local/ruby/lib/ruby/gems/1.9.1/gems/mysql2-0.2.6/lib/mysql2.rb:7:in`'$来自/usr/local/ruby/lib/ruby/gems/1.9.1/gems/bundler-1.0.10/lib/bundler/runtime.rb:68:in的b $ b需要从/ usr'require'
/local/ruby/lib/ruby/gems/1.9.1/gems/bundler-1.0.10/lib/bundler/runtime.rb:68:in`block（2 levels）in require'
from / usr /local/ruby/lib/ruby/gems/1.9.1/gems/bundler-1.0.10/lib/bundler/runtime.rb:66:in`each'
fro m /usr/local/ruby/lib/ruby/gems/1.9.1/gems/bundler-1.0.10/lib/bundler/runtime.rb:66:in`block in require'
from / usr /本地/ ruby​​ / lib / ruby​​ / gems / 1.9.1 / gems / bundler-1.0.10 / lib / bundler / runtime.rb：55：在`each'
从/ usr / local / ruby​​ / lib / ruby / gems / 1.9.1 / gems / bundler-1.0.10 / lib / bundler / runtime.rb：55：在`require'
从/usr/local/ruby/lib/ruby/gems/1.9。 1 / gems / bundler-1.0.10 / lib / bundler.rb：120：在'require'
from /Users/filzo/Documents/rails/blog/config/application.rb:7:in`'$ /usr/local/ruby/lib/ruby/gems/1.9.1/gems/railties-3.0.5/lib/rails/commands.rb:28:in中的$ b来自/ usr的`require'
/local/ruby/lib/ruby/gems/1.9.1/gems/railties-3.0.5/lib/rails/commands.rb:28:in`在
中从/ usr / local / ruby​​ / lib / ruby​​ / gems / 1.9.1 / gems / railties-3.0.5 / lib / rails / commands.rb：27：在`tap'中$ b $ from / usr / local / ruby​​ / lib / ruby​​ / gems / 1.9.1 / gems / railties-3.0.5 / lib / rails / commands.rb：27：在''
从脚本/导轨：6：在'require'
从脚本/导轨：6 ：在`中

我尝试了几种可能的解决方案（例如这： http://railsforum.com/viewtopic.php?pid=23125#23125 with libmysqlclient.18.dylib）;但没有为我工作。我希望你能帮助我。

编辑：
这似乎解决了我的问题：

  sudo install_name_tool -change libmysqlclient.18.dylib /usr/local/mysql/lib/libmysqlclient.18.dylib /usr/local/ruby/lib/ruby/gems/1.9。 1 / gems / mysql2-0.2.6 / lib / mysql2 / mysql2.bundle 
  

无论如何;是它在MySQL或ruby代码中的错误？

解决方案

简单和最好的方法之一是创建一个软按命令链接 -

  sudo ln -s /usr/local/mysql/lib/libmysqlclient.18.dylib / usr / lib /libmysqlclient.18.dylib 
  

http://rorguide.blogspot.com/2011/07/getting-error-library-not-loaded.html

I just compiled ruby and installes rubygems, mysql2 and rails, which worked quite well. But I get the following error message, whenever I try to start the rails server:

/usr/local/ruby/lib/ruby/gems/1.9.1/gems/mysql2-0.2.6/lib/mysql2.rb:7:in `require': dlopen(/usr/local/ruby/lib/ruby/gems/1.9.1/gems/mysql2-0.2.6/lib/mysql2/mysql2.bundle, 9): Library not loaded: libmysqlclient.18.dylib (LoadError)
  Referenced from: /usr/local/ruby/lib/ruby/gems/1.9.1/gems/mysql2-0.2.6/lib/mysql2/mysql2.bundle
  Reason: image not found - /usr/local/ruby/lib/ruby/gems/1.9.1/gems/mysql2-0.2.6/lib/mysql2/mysql2.bundle
  from /usr/local/ruby/lib/ruby/gems/1.9.1/gems/mysql2-0.2.6/lib/mysql2.rb:7:in `'
  from /usr/local/ruby/lib/ruby/gems/1.9.1/gems/bundler-1.0.10/lib/bundler/runtime.rb:68:in `require'
  from /usr/local/ruby/lib/ruby/gems/1.9.1/gems/bundler-1.0.10/lib/bundler/runtime.rb:68:in `block (2 levels) in require'
  from /usr/local/ruby/lib/ruby/gems/1.9.1/gems/bundler-1.0.10/lib/bundler/runtime.rb:66:in `each'
  from /usr/local/ruby/lib/ruby/gems/1.9.1/gems/bundler-1.0.10/lib/bundler/runtime.rb:66:in `block in require'
  from /usr/local/ruby/lib/ruby/gems/1.9.1/gems/bundler-1.0.10/lib/bundler/runtime.rb:55:in `each'
  from /usr/local/ruby/lib/ruby/gems/1.9.1/gems/bundler-1.0.10/lib/bundler/runtime.rb:55:in `require'
  from /usr/local/ruby/lib/ruby/gems/1.9.1/gems/bundler-1.0.10/lib/bundler.rb:120:in `require'
  from /Users/filzo/Documents/rails/blog/config/application.rb:7:in `'
  from /usr/local/ruby/lib/ruby/gems/1.9.1/gems/railties-3.0.5/lib/rails/commands.rb:28:in `require'
  from /usr/local/ruby/lib/ruby/gems/1.9.1/gems/railties-3.0.5/lib/rails/commands.rb:28:in `block in '
  from /usr/local/ruby/lib/ruby/gems/1.9.1/gems/railties-3.0.5/lib/rails/commands.rb:27:in `tap'
  from /usr/local/ruby/lib/ruby/gems/1.9.1/gems/railties-3.0.5/lib/rails/commands.rb:27:in `'
  from script/rails:6:in `require'
  from script/rails:6:in `'

I tried several possible solutions (e.g. this: http://railsforum.com/viewtopic.php?pid=23125#23125 with libmysqlclient.18.dylib); but nothing worked for me. I hope you can help me.

EDIT: It seems like this fixed the problem for me:

sudo install_name_tool -change libmysqlclient.18.dylib /usr/local/mysql/lib/libmysqlclient.18.dylib /usr/local/ruby/lib/ruby/gems/1.9.1/gems/mysql2-0.2.6/lib/mysql2/mysql2.bundle 

Anyway; is it a bug in the MySQL or the ruby-code?

解决方案

One of the simple and best way is to create a soft link by command -

sudo ln -s /usr/local/mysql/lib/libmysqlclient.18.dylib /usr/lib/libmysqlclient.18.dylib

http://rorguide.blogspot.com/2011/07/getting-error-library-not-loaded.html

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