在脚本中使用不带 Rails 的 ActiveRecord 3.1
以下应该在ActiveRecord 3.1中作为脚本工作（请注意，这是没有Rails的，而不是相反）：
#!/usr/bin/env ruby
require "rubygems"
require "active_record"
dbconfig = YAML::load(File.open('database.yml'))
ActiveRecord::Base.establish_connection(dbconfig)
irb
不幸的是，它给出了错误：
... connection_specification.rb:71:in `rescue in establish_connection': ...
Please install the mysql2 adapter: `gem install activerecord-mysql2-adapter` ...
添加按照之前的一些帖子的建议，在 require "active_record" 之前添加行 gem 'mysql2', '<0.3'时间；目前是 0.2.18) 不会改变它。
我怎样才能让它发挥作用？我想要 ActiveRecord，但不需要整个 Rails。
The following ought to work as a script, with ActiveRecord 3.1 (note that this is without Rails, not the other way around):
#!/usr/bin/env ruby
require "rubygems"
require "active_record"
dbconfig = YAML::load(File.open('database.yml'))
ActiveRecord::Base.establish_connection(dbconfig)
irb
Unfortunately, it gives the error:
... connection_specification.rb:71:in `rescue in establish_connection': ...
Please install the mysql2 adapter: `gem install activerecord-mysql2-adapter` ...
Adding the line gem 'mysql2', '<0.3' before require "active_record" as suggested by some previous posts (which reference 0.2.7, the 0.2 gem at the time; presently it's 0.2.18) doesn't change it.
How can I get it to work? I want ActiveRecord but not the whole of Rails.
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在终端中运行
并向您的代码添加行
require 'mysql2'Run in terminal
and add row to you code
require 'mysql2'这修复了我的问题问题，至少是暂时的。我还没有重新启动，所以我不知道它是否可以幸存。这看起来像是一个肮脏的黑客行为；一定有更好的方法。
我还没有测试上面 Aleksei 的答案，因为运行这个命令后我没有遇到同样的问题。当我这样做时会更新。
This has fixed my issue, at least temporarily. I haven't yet restarted, so I don't know if it'll survive that. And it seems like a dirty hack; there's got to be a better way.
I haven't yet tested Aleksei's answer above, since I'm not having the same issue after having run this command. Will update ifwhen I do.