第1步： -
rails s/usr/local/rvm/gems/ruby-1.9.2-p180/gems/mysql2-0.3.2/lib/mysql2.rb:8:in `require': dlopen(/usr/local/rvm/gems/ruby-1.9.2-p180/gems/mysql2-0.3.2/lib/mysql2/mysql2.bundle, 9): Library not loaded: libmysqlclient.16.dylib (LoadError)
Referenced from: /usr/local/rvm/gems/ruby-1.9.2-p180/gems/mysql2-0.3.2/lib/mysql2/mysql2.bundle
Reason: image not found - /usr/local/rvm/gems/ruby-1.9.2-p180/gems/mysql2-0.3.2/lib/mysql2/mysql2.bundle
from /usr/local/rvm/gems/ruby-1.9.2-p180/gems/mysql2-0.3.2/lib/mysql2.rb:8:in `<top (required)>'
from /usr/local/rvm/gems/ruby-1.9.2-p180/gems/bundler-1.0.12/lib/bundler/runtime.rb:68:in `require'
from /usr/local/rvm/gems/ruby-1.9.2-p180/gems/bundler-1.0.12/lib/bundler/runtime.rb:68:in `block (2 levels) in require'
from /usr/local/rvm/gems/ruby-1.9.2-p180/gems/bundler-1.0.12/lib/bundler/runtime.rb:66:in `each'
from /usr/local/rvm/gems/ruby-1.9.2-p180/gems/bundler-1.0.12/lib/bundler/runtime.rb:66:in `block in require'
from /usr/local/rvm/gems/ruby-1.9.2-p180/gems/bundler-1.0.12/lib/bundler/runtime.rb:55:in `each'
from /usr/local/rvm/gems/ruby-1.9.2-p180/gems/bundler-1.0.12/lib/bundler/runtime.rb:55:in `require'
from /usr/local/rvm/gems/ruby-1.9.2-p180/gems/bundler-1.0.12/lib/bundler.rb:120:in `require'
from /Users/mohit/projects/lbs_admin/config/application.rb:7:in `<top (required)>'
from /usr/local/rvm/gems/ruby-1.9.2-p180/gems/railties-3.0.3/lib/rails/commands.rb:28:in `require'
from /usr/local/rvm/gems/ruby-1.9.2-p180/gems/railties-3.0.3/lib/rails/commands.rb:28:in `block in <top (required)>'
from /usr/local/rvm/gems/ruby-1.9.2-p180/gems/railties-3.0.3/lib/rails/commands.rb:27:in `tap'
from /usr/local/rvm/gems/ruby-1.9.2-p180/gems/railties-3.0.3/lib/rails/commands.rb:27:in `<top (required)>'
from script/rails:6:in `require'
from script/rails:6:in `<main>'
第2步： -
sudo install_name_tool -change libmysqlclient.16.dylib /usr/local/mysql-5.5.9-osx10.6-x86_64/lib/libmysqlclient.16.dylib /usr/local/rvm/gems/ruby-1.9.2-p180/gems/mysql2-0.3.2/lib/mysql2/mysql2.bundle
结果： -
rails sWARNING: This version of mysql2 (0.3.2) doesn't ship with the ActiveRecord adapter bundled anymore as it's now part of Rails 3.1
WARNING: Please use the 0.2.x releases if you plan on using it in Rails <= 3.0.x
=> Booting WEBrick
=> Rails 3.0.3 application starting in development on http://0.0.0.0:3000
=> Call with -d to detach
=> Ctrl-C to shutdown server
Exiting
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.3/lib/active_record/connection_adapters/abstract/connection_specification.rb:71:in `rescue in establish_connection': Please install the mysql2 adapter: `gem install activerecord-mysql2-adapter` (no such file to load -- active_record/connection_adapters/mysql2_adapter) (RuntimeError)
from /usr/local/rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.3/lib/active_record/connection_adapters/abstract/connection_specification.rb:68:in `establish_connection'
from /usr/local/rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.3/lib/active_record/connection_adapters/abstract/connection_specification.rb:60:in `establish_connection'
from /usr/local/rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.3/lib/active_record/connection_adapters/abstract/connection_specification.rb:55:in `establish_connection'
from /usr/local/rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.3/lib/active_record/railtie.rb:59:in `block (2 levels) in <class:Railtie>'
from /usr/local/rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.0.3/lib/active_support/lazy_load_hooks.rb:36:in `instance_eval'
from /usr/local/rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.0.3/lib/active_support/lazy_load_hooks.rb:36:in `execute_hook'
from /usr/local/rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.0.3/lib/active_support/lazy_load_hooks.rb:43:in `block in run_load_hooks'
from /usr/local/rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.0.3/lib/active_support/lazy_load_hooks.rb:42:in `each'
from /usr/local/rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.0.3/lib/active_support/lazy_load_hooks.rb:42:in `run_load_hooks'
from /usr/local/rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.3/lib/active_record/base.rb:1891:in `<top (required)>'
from /usr/local/rvm/gems/ruby-1.9.2-p180/gems/will_paginate-3.0.pre2/lib/will_paginate/finders/active_record.rb:31:in `enable!'
from /usr/local/rvm/gems/ruby-1.9.2-p180/gems/will_paginate-3.0.pre2/lib/will_paginate/railtie.rb:9:in `block in <class:Railtie>'
from /usr/local/rvm/gems/ruby-1.9.2-p180/gems/railties-3.0.3/lib/rails/initializable.rb:25:in `instance_exec'
from /usr/local/rvm/gems/ruby-1.9.2-p180/gems/railties-3.0.3/lib/rails/initializable.rb:25:in `run'
from /usr/local/rvm/gems/ruby-1.9.2-p180/gems/railties-3.0.3/lib/rails/initializable.rb:50:in `block in run_initializers'
from /usr/local/rvm/gems/ruby-1.9.2-p180/gems/railties-3.0.3/lib/rails/initializable.rb:49:in `each'
from /usr/local/rvm/gems/ruby-1.9.2-p180/gems/railties-3.0.3/lib/rails/initializable.rb:49:in `run_initializers'
from /usr/local/rvm/gems/ruby-1.9.2-p180/gems/railties-3.0.3/lib/rails/application.rb:134:in `initialize!'
from /usr/local/rvm/gems/ruby-1.9.2-p180/gems/railties-3.0.3/lib/rails/application.rb:77:in `method_missing'
from /Users/mohit/projects/lbs_admin/config/environment.rb:5:in `<top (required)>'
from /Users/mohit/projects/lbs_admin/config.ru:3:in `require'
from /Users/mohit/projects/lbs_admin/config.ru:3:in `block in <main>'
from /usr/local/rvm/gems/ruby-1.9.2-p180/gems/rack-1.2.2/lib/rack/builder.rb:46:in `instance_eval'
from /usr/local/rvm/gems/ruby-1.9.2-p180/gems/rack-1.2.2/lib/rack/builder.rb:46:in `initialize'
from /Users/mohit/projects/lbs_admin/config.ru:1:in `new'
from /Users/mohit/projects/lbs_admin/config.ru:1:in `<main>'
from /usr/local/rvm/gems/ruby-1.9.2-p180/gems/rack-1.2.2/lib/rack/builder.rb:35:in `eval'
from /usr/local/rvm/gems/ruby-1.9.2-p180/gems/rack-1.2.2/lib/rack/builder.rb:35:in `parse_file'
from /usr/local/rvm/gems/ruby-1.9.2-p180/gems/rack-1.2.2/lib/rack/server.rb:162:in `app'
from /usr/local/rvm/gems/ruby-1.9.2-p180/gems/rack-1.2.2/lib/rack/server.rb:248:in `wrapped_app'
from /usr/local/rvm/gems/ruby-1.9.2-p180/gems/rack-1.2.2/lib/rack/server.rb:213:in `start'
from /usr/local/rvm/gems/ruby-1.9.2-p180/gems/railties-3.0.3/lib/rails/commands/server.rb:65:in `start'
from /usr/local/rvm/gems/ruby-1.9.2-p180/gems/railties-3.0.3/lib/rails/commands.rb:30:in `block in <top (required)>'
from /usr/local/rvm/gems/ruby-1.9.2-p180/gems/railties-3.0.3/lib/rails/commands.rb:27:in `tap'
from /usr/local/rvm/gems/ruby-1.9.2-p180/gems/railties-3.0.3/lib/rails/commands.rb:27:in `<top (required)>'
from script/rails:6:in `require'
from script/rails:6:in `<main>'
第3步： -
sudo gem uninstall mysql2
sudo env ARCHFLAGS="-arch i386" gem install mysql2 -- --with-mysql-config=/usr/local/mysql-5.5.9-osx10.6-x86_64/bin/mysql_config
现状： -
ruby -v
ruby 1.9.2p180 (2011-02-18 revision 30909) [x86_64-darwin10.7.0]
rails -v
Rails 3.0.3
宝石清单
*** LOCAL GEMS ***
abstract (1.0.0)
actionmailer (3.0.7, 3.0.3)
actionpack (3.0.7, 3.0.3)
activemodel (3.0.7, 3.0.3)
activerecord (3.0.7, 3.0.3)
activeresource (3.0.7, 3.0.3)
activesupport (3.0.7, 3.0.3)
annotate-models (1.0.4)
arel (2.0.9)
builder (2.1.2)
bundler (1.0.12)
erubis (2.6.6)
i18n (0.5.0)
mail (2.2.19)
mime-types (1.16)
mysql2 (0.3.2)
polyglot (0.3.1)
rack (1.2.2)
rack-mount (0.6.14)
rack-test (0.5.7)
rails (3.0.7, 3.0.3)
railties (3.0.7, 3.0.3)
rake (0.8.7)
thor (0.14.6)
treetop (1.4.9)
tzinfo (0.3.27)
web-app-theme (0.6.3)
will_paginate (3.0.pre2)
找到mysql_config
/usr/local/mysql-5.5.9-osx10.6-x86_64/bin/mysql_config
/usr/local/mysql-5.5.9-osx10.6-x86_64/man/man1/mysql_config.1
bundle show mysql2
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/mysql2-0.3.2
找到libmysqlclient.16.dylib
/usr/local/mysql-5.5.9-osx10.6-x86_64/lib/libmysqlclient.16.dylib
有人能帮助我吗？
答案 0 :(得分：6)
我有山姆问题。我做的是做什么;
gem install --version '0.2.7' mysql2
然后在你的Rails的GemFile上。应该是这样的。
gem 'mysql2', '0.2.7'
然后再试一次。希望它有所帮助。
答案 1 :(得分：2)
rails s警告：此版本的mysql2（0.3.2）不再附带捆绑的ActiveRecord适配器，因为它现在是Rails 3.1的一部分 警告：如果您打算在Rails＆lt; = 3.0.x
中使用它，请使用0.2.x版本MySql版本'0.2.7'解决了我的问题。
gem 'mysql2', '0.2.7'
答案 2 :(得分：2)
第2步之后的堆栈跟踪告诉您该怎么做：
请安装mysql2适配器：
gem install activerecord-mysql2-adapter
此外，将您的Rails升级到3.0.7 - 3.0.3中存在许多安全漏洞（和错误）。
看起来Rails的错误信息是错误的，它应该是：
如果您打算在Rails＆lt; = 3.1
中使用它，请使用0.2.x版本
IE中。对于小于3.1的任何东西，你需要将mysql2固定到0.2版本，并且不允许它使用0.3。为此，请将Gemfile中的mysql2行更改为：
gem "mysql2", "~> 0.2"
然后重新运行bundle install
答案 3 :(得分：1)
试试这个（但我无法保证）
希望它会在此之后发挥作用。我会为你伸出手指。
答案 4 :(得分：1)
上述问题目前发生在使用Ruby 1.9.2和Rails 3.0.3的EngineYard App Cloud上。使用mysql 2.8.1 barfs b / c EY设置mysql2适配器。使用mysql2 0.3.2 barfs。所以我很难过。 Richard Soutar回答道具。它奏效了。