Error program

[eluser]nnn[/eluser]
I'm new to this codeigniter can any one please solve me out!

This is controller.
<?php
class Ex extends CI_Controller{
function Ex(){
parent::__construct();
}
function see(){
$this->load->model('emp_model');
$data['query'] = $this->emp_model->emp_getall();

$this->load->view('emp_view',$data);

}
}
?>

This model.
<?php
class Emp_model extends CI_Model{
function __construct(){
parent::__construct();
}

function emp_getall(){
$this->load->database();
$query=$this->db->get('student');
return $query;
}
}
?>

This view.
<?php

foreach($data->result() as $row){
echo $row->name;
echo $row->id;
echo $row->branch;
echo "<br>";
}
?&gt;