Change DB config

Thank you for your message

I see what you mean but it's not what I search.

I will try to explain you differently ;

I am making a database monitor, so to acces to the page, the admin have to connect to the database.

So, in first case, the database configuration (application/config/database.php) is empty.

And if the admin enter the correct username/passeword (of the database) he is loged on.

This is what I can't do for the moment, write in application/config/database.php from a controller.

So if anyone has an idea, it would be cool.