Check if Database Library is loaded and Connected to Database

[eluser]section31[/eluser]
What's the best way to check if inside the constructor of a controller to see if the database library is loaded and connected to a database?

The best I could come up with was this

Code:

if (isset($this->db->conn_id) && is_resource($this->db->conn_id)) {
     echo 'database is loaded and conected';
}

Is this the most effective way?

[eluser]Seppo[/eluser]
Well... it will fail if you use mysqli driver, where the conn_id is an object...
I think you can check $this->db->conn_id !== FALSE, because false is the default value.

[eluser]section31[/eluser]
Also, where can I find the CI_DB class?

I see this used a lot.

Code:

if (class_exists('CI_DB')) {}

EDIT: nm about this, i found out that it's created in an eval() function just as an empty class that extends main database class.