我已经为此纠结了一段时间。

我已经在我的雪豹机器上安装了Rails 3, gem, mysql。一切都很顺利,直到我创建了我的第一个项目并试图运行

rails server

在运行这个我得到:

jontybrook$ rails server
/Library/Ruby/Gems/1.8/gems/mysql2-0.2.6/lib/mysql2/mysql2.bundle: dlopen(/Library/Ruby/Gems/1.8/gems/mysql2-0.2.6/lib/mysql2/mysql2.bundle, 9): Library not loaded: libmysqlclient.16.dylib (LoadError)
  Referenced from: /Library/Ruby/Gems/1.8/gems/mysql2-0.2.6/lib/mysql2/mysql2.bundle
  Reason: image not found - /Library/Ruby/Gems/1.8/gems/mysql2-0.2.6/lib/mysql2/mysql2.bundle
    from /Library/Ruby/Gems/1.8/gems/mysql2-0.2.6/lib/mysql2.rb:7
    from /Library/Ruby/Gems/1.8/gems/bundler-1.0.7/lib/bundler/runtime.rb:64:in `require'
    from /Library/Ruby/Gems/1.8/gems/bundler-1.0.7/lib/bundler/runtime.rb:64:in `require'
    from /Library/Ruby/Gems/1.8/gems/bundler-1.0.7/lib/bundler/runtime.rb:62:in `each'
    from /Library/Ruby/Gems/1.8/gems/bundler-1.0.7/lib/bundler/runtime.rb:62:in `require'
    from /Library/Ruby/Gems/1.8/gems/bundler-1.0.7/lib/bundler/runtime.rb:51:in `each'
    from /Library/Ruby/Gems/1.8/gems/bundler-1.0.7/lib/bundler/runtime.rb:51:in `require'
    from /Library/Ruby/Gems/1.8/gems/bundler-1.0.7/lib/bundler.rb:112:in `require'
    from /Users/jontybrook/Dropbox/CODING/simple_cms/config/application.rb:7
    from /Library/Ruby/Gems/1.8/gems/railties-3.0.3/lib/rails/commands.rb:28:in `require'
    from /Library/Ruby/Gems/1.8/gems/railties-3.0.3/lib/rails/commands.rb:28
    from /Library/Ruby/Gems/1.8/gems/railties-3.0.3/lib/rails/commands.rb:27:in `tap'
    from /Library/Ruby/Gems/1.8/gems/railties-3.0.3/lib/rails/commands.rb:27
    from script/rails:6:in `require'
    from script/rails:6
jontybrook$ 

据我所知,问题是与mysql2宝石。MySQL似乎运行良好,我的Gemfile引用mysql2,我的数据库。Yml文件似乎也可以。

错误中提到

Reason: image not found - /Library/Ruby/Gems/1.8/gems/mysql2-0.2.6/lib/mysql2/mysql2.bundle

然而,

jontybrook$ cd /Library/Ruby/Gems/1.8/gems/mysql2-0.2.6/lib/mysql2
jontybrook$ ls
client.rb   em.rb       error.rb      mysql2.bundle result.rb

MySQL2。捆绑在那里!?

如果我使用旧的mysql gem, WEBrick启动正常。但这并不理想,不是吗?

谷歌能给我的我都试过了!任何帮助都非常感激。


当前回答

刚刚遇到了这个问题。我所要做的就是卸载mysql2 gem并重新安装它。希望这对其他人也有用

其他回答

我终于解决了这个问题!

我在RVM下重新安装了Ruby和Rails。我使用的是Ruby版本1.9.2-p136。

在rvm下重新安装后,仍然存在此错误。

最后,解决这个问题的神奇命令是:

sudo install_name_tool -change libmysqlclient.16.dylib /usr/local/mysql/lib/libmysqlclient.16.dylib ~/.rvm/gems/ruby-1.9.2-p136/gems/mysql2-0.2.6/lib/mysql2/mysql2.bundle

我已经通过在我的项目文件夹中创建.rvmrc文件解决了这个问题:

rvm use <yourrubie>

然后进入我的项目路径

cd ~/myprojectpath

然后我就跑

bundle install

如果你正在使用OSX并使用brew安装mysql,你可以:

brew link mysql

如果你有问题的版本(我有mysql 5.7运行,而我的gem需要5.6.25),你可以

brew unlink mysql
brew switch mysql 5.6.25

对我来说,这只是因为我升级了mysql,但没有更新mysql2宝石-重新安装宝石将修复它…

宝石原始mysql2

在OSX El Capitan更新时,你这样做:

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

它抛出一个错误

ln: /usr/lib/libmysqlclient.18.dylib: Operation not permitted

因此,为了避免这种情况,您可以首先定位libmysqlclient.18。使用命令Dylib

User$ locate libmysqlclient.18.dylib

在我的例子中,它返回/usr/local/mysql-5.5.24-osx10.5-x86_64/lib/libmysqlclient.18.dylib

因此,我们将创建usr/local/lib/的符号链接,如下所示:

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

详情:https://forums.developer.apple.com/thread/7935