ruby1.9.3 gem install ibm_db 安装好了 2.5.9 版本的 ibm_db irb require 'ibm_db'

马上报错。 require 'mswin32/ibm_db',一样报错

irb(main):004:0> require 'ibm_db'
NameError: uninitialized constant ActiveRecord::ConnectionNotEstablished
        from C:/RailsInstaller/Ruby1.8.7/lib/ruby/gems/1.8/gems/activerecord-3.0
.9/lib/active_record/connection_adapters/abstract/connection_pool.rb:9
        from C:/RailsInstaller/Ruby1.8.7/lib/ruby/site_ruby/1.8/rubygems/custom_
require.rb:36:in `gem_original_require'
        from C:/RailsInstaller/Ruby1.8.7/lib/ruby/site_ruby/1.8/rubygems/custom_
require.rb:36:in `require'
        from C:/RailsInstaller/Ruby1.8.7/lib/ruby/gems/1.8/gems/activerecord-3.0
.9/lib/active_record/connection_adapters/abstract_adapter.rb:11
        from C:/RailsInstaller/Ruby1.8.7/lib/ruby/site_ruby/1.8/rubygems/custom_
require.rb:36:in `gem_original_require'
        from C:/RailsInstaller/Ruby1.8.7/lib/ruby/site_ruby/1.8/rubygems/custom_
require.rb:36:in `require'
        from C:/RailsInstaller/Ruby1.8.7/lib/ruby/gems/1.8/gems/ibm_db-2.5.9-x86
-mingw32/lib/active_record/connection_adapters/ibm_db_adapter.rb:11
        from C:/RailsInstaller/Ruby1.8.7/lib/ruby/site_ruby/1.8/rubygems/custom_
require.rb:36:in `gem_original_require'
        from C:/RailsInstaller/Ruby1.8.7/lib/ruby/site_ruby/1.8/rubygems/custom_
require.rb:36:in `require'
        from C:/RailsInstaller/Ruby1.8.7/lib/ruby/gems/1.8/gems/ibm_db-2.5.9-x86
-mingw32/lib/ibm_db.rb:2
        from C:/RailsInstaller/Ruby1.8.7/lib/ruby/site_ruby/1.8/rubygems/custom_
require.rb:57:in `gem_original_require'
        from C:/RailsInstaller/Ruby1.8.7/lib/ruby/site_ruby/1.8/rubygems/custom_
require.rb:57:in `require'
        from (irb):4
        from :0

后来试 ruby 1.8.7，同样报错。 再试 ibm_db 2.5.6，2.5.7....报错报错。

折腾了 3 天了，一点进展没有。 换过 railsinstaller、railFTW 的环境，都不管用，之前以为是什么兼容问题。