宝石2.0。 ActiveRecord 4.1.2的兼容性问题

Question

我试图与mysql数据库建立联系，并从那个特定的数据库中获取数据，但是它出现了一个错误..，请修复它

代码是：

require 'rubygems'
#require 'mysql'
require 'active_record'


ActiveRecord::Base.establish_connection(
    {
    :adapter => 'mysql',
    :host => 'localhost',
    :database => 'spyware',
    :user => 'root',
    :password => 'sqlpass'
    }
)

class Definition<ActiveRecord::Base
end

defni = Definition.Find(:all)

defni.each do |row|

    print "\n\n".row.name
end

我得到的错误是：

ruby dbconnect.rb
C:/Ruby200/lib/ruby/gems/2.0.0/gems/activerecord-4.1.2/lib/active_record/connection_adapters/connection_specification.rb:190:in `rescue in spec': Specified 'mysql' for database adapter, but the gem is not loaded. Add `gem 'mysql'` to your Gemfile (and ensure its version is at the minimum required by ActiveRecord). (Gem::LoadError)
    from C:/Ruby200/lib/ruby/gems/2.0.0/gems/activerecord-4.1.2/lib/active_record/connection_adapters/connection_specification.rb:187:in `spec'
    from C:/Ruby200/lib/ruby/gems/2.0.0/gems/activerecord-4.1.2/lib/active_record/connection_handling.rb:50:in `establish_connection'
    from dbconnect.rb:6:in `<main>'
>Exit code: 1

我正在使用gem版本2.0.14和mysql版本是2.8.1 x86

Answer 1

Rails已经为您提供了答案：将gem'mysql gem 'mysql'添加到您的Gemfile中（并确保其版本处于ActiveRecord要求的最低要求）。 读取错误日志是一个好主意！ ;）