在 Rails 中连接现有的 MySQL 数据库答案

【问题标题】：Connect existing MySQL database in rails在 Rails 中连接现有的 MySQL 数据库
【发布时间】：2012-12-10 10:54:29
【问题描述】：

我想将我的 Ruby on Rails 应用程序与单独开发的 MySQL 数据库连接起来。对于这个连接，我使用了 development环境：

adapter: mysql
username: root  
password: ******  
host: 127.0.0.1
port: 3306

当我尝试在 Rails 中建立 MySQL 连接时，它显示：

C:/Ruby193/lib/ruby/gems/1.9.1/gems/mysql-2.9.0-x86-mingw32/lib/mysql.rb:4:in `require': Incorrect MySQL client library version! This gem was compiled for 6.0.0 but the client library is 5.5.9. (RuntimeError)
    from C:/Ruby193/lib/ruby/gems/1.9.1/gems/mysql-2.9.0-x86-mingw32/lib/mysql.rb:4:in `<top (required)>'
    from C:/Ruby193/lib/ruby/gems/1.9.1/gems/bundler-1.2.3/lib/bundler/runtime.rb:68:in `require'
    from C:/Ruby193/lib/ruby/gems/1.9.1/gems/bundler-1.2.3/lib/bundler/runtime.rb:68:in `block (2 levels) in require'
    from C:/Ruby193/lib/ruby/gems/1.9.1/gems/bundler-1.2.3/lib/bundler/runtime.rb:66:in `each'
    from C:/Ruby193/lib/ruby/gems/1.9.1/gems/bundler-1.2.3/lib/bundler/runtime.rb:66:in `block in require'
    from C:/Ruby193/lib/ruby/gems/1.9.1/gems/bundler-1.2.3/lib/bundler/runtime.rb:55:in `each'
    from C:/Ruby193/lib/ruby/gems/1.9.1/gems/bundler-1.2.3/lib/bundler/runtime.rb:55:in `require'
    from C:/Ruby193/lib/ruby/gems/1.9.1/gems/bundler-1.2.3/lib/bundler.rb:128:in `require'
    from D:/registration/config/application.rb:7:in `<top (required)>'
    from C:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-3.2.9/lib/rails/commands.rb:53:in `require'
    from C:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-3.2.9/lib/rails/commands.rb:53:in `block in <top (required)>'
    from C:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-3.2.9/lib/rails/commands.rb:50:in `tap'
    from C:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-3.2.9/lib/rails/commands.rb:50:in `<top (required)>'
    from script/rails:6:in `require'
    from script/rails:6:in `<main>'

D:\registration>

另外，当我尝试我的 rake 命令时，它显示：

rake aborted!
Incorrect MySQL client library version! This gem was compiled for 6.0.0 but the client library is 5.5.9.
D:/registration/config/application.rb:7:in `<top (required)>'
D:/registration/Rakefile:5:in `<top (required)>'
(See full trace by running task with --trace)

D:\registration>

如何连接到我的数据库？

【问题讨论】：

标签： mysql ruby-on-rails ruby database rake

【解决方案1】：

根据错误，您使用的 gem 版本似乎比您的 MySQL 客户端更新。

上面写着：

您的 gem 已编译（创建）我的 sql 客户端版本 6.0.0。
您的实际 my sql 客户端版本（在您的机器上）是 5.5.9。

您能否发布您的 MySQL gem 版本以及您的 MySQL 客户端版本？

将您的 MySQL 客户端升级到 6.0.0 版应该可以解决此问题。

【讨论】：