In case of  using the RadRails IDE on WindowsXP with mysql. If you got an error message like this 'uninnitialize constant Mysql' when command with 'ruby script/generate scaffold Xxxx'.

I don't know exactly why occured this type of error. 

To fix it, you must do the following:

1. Goto your mysql home\bin directory : C:\mysql\bin 

2. There is only one DLL file. File name is libmySQL.dll. 

3. Copy libmySQL.dll file to C:\Windows directory. 

All done. Happy Rails ~~

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