MySQL 客户端库版本不正确！此 gem 是为 5.5.37 编译的，但客户端库是 5.6.25

Question

我将 Ubuntu 从 2014.04 升级到 2015.04，现在 bundle exec rake db:migrate returns 出现错误：

$ bundle exec rake db:migrate --trace
rake aborted!
Incorrect MySQL client library version! This gem was compiled for 5.5.37 but the client library is 5.6.25.
/home/nico/.rvm/gems/ruby-1.9.3-p362/gems/mysql2-0.2.11/lib/mysql2.rb:9:in `require'
/home/nico/.rvm/gems/ruby-1.9.3-p362/gems/mysql2-0.2.11/lib/mysql2.rb:9:in `<top (required)>'
/home/nico/.rvm/gems/ruby-1.9.3-p362@global/gems/bundler-1.2.3/lib/bundler/runtime.rb:68:in `require'
/home/nico/.rvm/gems/ruby-1.9.3-p362@global/gems/bundler-1.2.3/lib/bundler/runtime.rb:68:in `block (2 levels) in require'
/home/nico/.rvm/gems/ruby-1.9.3-p362@global/gems/bundler-1.2.3/lib/bundler/runtime.rb:66:in `each'
/home/nico/.rvm/gems/ruby-1.9.3-p362@global/gems/bundler-1.2.3/lib/bundler/runtime.rb:66:in `block in require'
/home/nico/.rvm/gems/ruby-1.9.3-p362@global/gems/bundler-1.2.3/lib/bundler/runtime.rb:55:in `each'
/home/nico/.rvm/gems/ruby-1.9.3-p362@global/gems/bundler-1.2.3/lib/bundler/runtime.rb:55:in `require'
/home/nico/.rvm/gems/ruby-1.9.3-p362@global/gems/bundler-1.2.3/lib/bundler.rb:128:in `require'
/home/nico/myapp/config/application.rb:7:in `<top (required)>'
/home/nico/myapp/Rakefile:4:in `require'
/home/nico/myapp/Rakefile:4:in `<top (required)>'
/home/nico/.rvm/gems/ruby-1.9.3-p362@global/gems/rake-10.0.3/lib/rake/rake_module.rb:25:in `load'
/home/nico/.rvm/gems/ruby-1.9.3-p362@global/gems/rake-10.0.3/lib/rake/rake_module.rb:25:in `load_rakefile'
/home/nico/.rvm/gems/ruby-1.9.3-p362@global/gems/rake-10.0.3/lib/rake/application.rb:583:in `raw_load_rakefile'
/home/nico/.rvm/gems/ruby-1.9.3-p362@global/gems/rake-10.0.3/lib/rake/application.rb:89:in `block in load_rakefile'
/home/nico/.rvm/gems/ruby-1.9.3-p362@global/gems/rake-10.0.3/lib/rake/application.rb:160:in `standard_exception_handling'
/home/nico/.rvm/gems/ruby-1.9.3-p362@global/gems/rake-10.0.3/lib/rake/application.rb:88:in `load_rakefile'
/home/nico/.rvm/gems/ruby-1.9.3-p362@global/gems/rake-10.0.3/lib/rake/application.rb:72:in `block in run'
/home/nico/.rvm/gems/ruby-1.9.3-p362@global/gems/rake-10.0.3/lib/rake/application.rb:160:in `standard_exception_handling'
/home/nico/.rvm/gems/ruby-1.9.3-p362@global/gems/rake-10.0.3/lib/rake/application.rb:70:in `run'
/home/nico/.rvm/gems/ruby-1.9.3-p362@global/gems/rake-10.0.3/bin/rake:33:in `<top (required)>'
/home/nico/.rvm/gems/ruby-1.9.3-p362@global/bin/rake:19:in `load'
/home/nico/.rvm/gems/ruby-1.9.3-p362@global/bin/rake:19:in `<main>'
/home/nico/.rvm/gems/ruby-1.9.3-p362/bin/ruby_noexec_wrapper:14:in `eval'
/home/nico/.rvm/gems/ruby-1.9.3-p362/bin/ruby_noexec_wrapper:14:in `<main>'

如何解决这个问题？
我宁愿避免更改服务器端版本。

I can't run "bundle update" because of "mysql2" gem 处的答案没有解决问题。

本地版本：

gem 2.4.8
Rails 3.0.19
mysql 版本 14.14 分发 5.6.25

Answer 1

运行这些命令解决了问题：

gem uninstall mysql2
bundle install

Answer 2

我运行遇到了同样的问题，但接受的答案对我不起作用，很可能是因为我使用了 capist运行o，它将所有 gem 安装到每个应用程序的共享目录中.

bundle show mysql2

（运行在您的应用文件夹中）将显示 mysql 的安装位置。然后删除它以及规范。

rm -rf /path/to/application/shared/bundle/ruby/<version>/gems/mysql2-<version>
rm /path/to/application/shared/bundle/ruby/<version>/specifications/mysql2-<version>.gemspec

应该可以解决问题。或者只需删除完整的 bundle/* 并重新安装所有内容。

MySQL 客户端库版本不正确！此 gem 是为 5.5.37 编译的，但客户端库是 5.6.25

Incorrect MySQL client library version! This gem was compiled for 5.5.37 but the client library is 5.6.25

mysql

ruby-on-rails

gem

rails-migrations

ubuntu-15.04