How to use a database library in my own class

[eluser]Unknown[/eluser]
Plese help me. I write my own library and my class want to use a ci database library. But when I load this library with this code :
$CI =& get_instance();
$CI->load->library('database');

I have an error message :
Unable to load the request class : database

but when I test to load another library : example session.
I can use it. Can I resolve this problem.

I am a new ci user and my English skill is bad.

[eluser]Deveron[/eluser]
Hi,

the answer is: there is no database library.

but...

you can, if you like, load the database manually with:

Code:

$CI->load->database();

Please take a look at the User Guides for better understanding:
http://ellislab.com/codeigniter/user-gui...cting.html

Cheers

[eluser]Unknown[/eluser]
Thank you very much. I can resolved this problem.