model function error in codeigniter 2

[eluser]dhaulagiri[/eluser]
Hi friends, i am building new application in codeigniter 2

I am getting error

Fatal error: Call to undefined method CI_DB_mysql_driver::getwhere() in C:\wamp\www\xxx\application\models\page_model.php on line 23

while writing this function in model

Code:

function fetchPage(){
        $data = array();
        $options = array('status'=>'yes', 'type'=>'about');
        //get items from database
        $this->db->getwhere('pages', $options, 1);
        if($q->numrows() > 0){
            $data = $q->row_array();
        }
        return $data;
        $q->free_result();
    }

pls help