DB Connection Issue

[eluser]latuss[/eluser]
mmm.. I put this in the controller

Code:

function index()
    {
        $this->load->view('welcome_message');
        $link = mysql_connect('localhost:3306', 'root', 'root');
        if (!$link) {
            die('Could not connect: ' . mysql_error());
        }
        echo 'Connected successfully';
        mysql_close($link);
    }

and I get this error

Code:

Fatal error: Call to undefined function mysql_connect() in /var/www/code/system/application/controllers/welcome.php on line 14