How to user library of CI (not use all CI)

[eluser]Unknown[/eluser]
I have a webpage, not write by CI, (write from scrate with pure PHP code)

I can't replace my code with CI now, because there are many code.

Now I need only use DB Class, DB function of CI.

How can I do this?

Thanh you much!

[eluser]Ben Edmunds[/eluser]
You might be better off looking for a stand-alone DB class or maybe Zend DB...