这是对我有用的答案.原来这是 x64 与 x32 问题和 Rails 2.3.2 的问题.

Here's the answer that worked for me. Turns out it was an issue of x64 vs. x32 issue and Rails 2.3.2.

我从这里得到的答案(http://osdir.com/ml/RubyonRailsTalk/2009-06/msg01775.html):

The answer I got from here (http://osdir.com/ml/RubyonRailsTalk/2009-06/msg01775.html):

如果其他人有同样的经过很多努力后的问题我的 Windows XP x64 机器，带有 MySQL5.1.30 (x64) 和 Rails 2.3.2 已安装，以上建议帮助过我.从这里下载 libMySql.dll (http://instantrails.rubyforge.org/svn/trunk/InstantRails-win/InstantRails/mysql/bin/)并将其放入 ruby​​\bin 解决了问题.

In case anyone else has the same problem after a lot of struggling on my Windows XP x64 machine, with MySQL 5.1.30 (x64) and Rails 2.3.2 installed, this above suggestiong helped me. Download libMySql.dll from here (http://instantrails.rubyforge.org/svn/trunk/InstantRails-win/InstantRails/mysql/bin/) and putting it in ruby\bin solved the problem.