在Mavericks上使用Rails + MySQL - 库未加载：libmysqlclient.18.dylib

Question

当我在我的本地主机(OSX Mavericks)运行一个Rails(rails s)应用程序时，出现了以下错误。

message:/Users/adam/.rvm/gems/ruby-2.0.0-p481/gems/mysql2-0.3.16/lib/mysql2.rb:8:in `require': dlopen(/Users/adam/.rvm/gems/ruby-2.0.0-p481/extensions/x86_64-darwin-13/2.0.0-static/mysql2-0.3.16/mysql2/mysql2.bundle, 9): Library not loaded: libmysqlclient.18.dylib (LoadError)
  Referenced from: /Users/adam/.rvm/gems/ruby-2.0.0-p481/extensions/x86_64-darwin-13/2.0.0-static/mysql2-0.3.16/mysql2/mysql2.bundle
  Reason: image not found - /Users/adam/.rvm/gems/ruby-2.0.0-p481/extensions/x86_64-darwin-13/2.0.0-static/mysql2-0.3.16/mysql2/mysql2.bundle
    from /Users/adam/.rvm/gems/ruby-2.0.0-p481/gems/mysql2-0.3.16/lib/mysql2.rb:8:in `<top (required)>'
    from /Users/adam/.rvm/gems/ruby-2.0.0-p481@global/gems/bundler-1.6.2/lib/bundler/runtime.rb:76:in `require'
    from /Users/adam/.rvm/gems/ruby-2.0.0-p481@global/gems/bundler-1.6.2/lib/bundler/runtime.rb:76:in `block (2 levels) in require'
    from /Users/adam/.rvm/gems/ruby-2.0.0-p481@global/gems/bundler-1.6.2/lib/bundler/runtime.rb:72:in `each'
    from /Users/adam/.rvm/gems/ruby-2.0.0-p481@global/gems/bundler-1.6.2/lib/bundler/runtime.rb:72:in `block in require'
    from /Users/adam/.rvm/gems/ruby-2.0.0-p481@global/gems/bundler-1.6.2/lib/bundler/runtime.rb:61:in `each'
    from /Users/adam/.rvm/gems/ruby-2.0.0-p481@global/gems/bundler-1.6.2/lib/bundler/runtime.rb:61:in `require'
    from /Users/adam/.rvm/gems/ruby-2.0.0-p481@global/gems/bundler-1.6.2/lib/bundler.rb:132:in `require'
    from /Users/adam/rubydev/logistadvise/config/application.rb:7:in `<top (required)>'
    from /Users/adam/.rvm/gems/ruby-2.0.0-p481/gems/railties-4.0.0/lib/rails/commands.rb:76:in `require'
    from /Users/adam/.rvm/gems/ruby-2.0.0-p481/gems/railties-4.0.0/lib/rails/commands.rb:76:in `block in <top (required)>'
    from /Users/adam/.rvm/gems/ruby-2.0.0-p481/gems/railties-4.0.0/lib/rails/commands.rb:73:in `tap'
    from /Users/adam/.rvm/gems/ruby-2.0.0-p481/gems/railties-4.0.0/lib/rails/commands.rb:73:in `<top (required)>'
    from bin/rails:4:in `require'
    from bin/rails:4:in `<main>'

我不确定如何安装了MySQL，但我猜它在名为Cellar的子文件夹中。

这是我的bash_profile的内容：

MYSQL=/usr/local/mysql/bin
export PATH=$PATH:$MYSQL
export DYLD_LIBRARY_PATH=/usr/local/mysql/lib:$DYLD_LIBRARY_PATH
export PG_DUMP="/Applications/Postgres.app/Contents/MacOS/bin/"
#PATH=$PG_DUMP:$PATH
...

如何解决这个问题？

- user984621

Answer 1

我也遇到了同样的问题。因为我使用了brew安装，DYLD的位置发生了改变。尝试以下步骤：

export DYLD_LIBRARY_PATH=/usr/local/mysql-5.1.67-osx10.6-x86_64/lib:$DYLD_LIBRARY_PATH

首先请检查上述路径是否存在，可以使用以下命令进行检查，并相应调整导出路径：

ls -1 /usr/local/mysql-5.1.67-osx10.6-x86_64

你可能可以创建符号链接等。对我来说有点烦人，但使用正确的路径对我很有帮助。

同时也尝试使用 which mysql 命令检查是否已将mysql添加至路径中。如果没有输出，则说明路径设置错误。

- AJ Meyghani

Answer 2

sudo install_name_tool -change libmysqlclient.18.dylib /usr/local/mysql/lib/libmysqlclient.18.dylib ~/.rvm/gems/ruby-2.0.0-p481/extensions/x86_64-darwin-13/2.0.0-static/mysql2-0.3.16/mysql2/mysql2.bundle

这应该适用于您。

- Anand Immannavar