Creating a login system (that isn't working)

[eluser]Unknown[/eluser]
To avoid the bloat of other login systems, I have attempted to create my own. I am following this guide, but have changed a few things because I am using jQuery UI to replace views that aren't needed. There are some problems though. The login system doesn't work. I am not getting any errors either. I was hoping that someone could review the code and see where I might have gone wrong. Thanks.

I created the database and all tables that are required for the project and inserted a user via SQL.

Code:

CREATE TABLE `users` (
`id` tinyint(4) NOT NULL AUTO_INCREMENT,
`username` varchar(10) NOT NULL,
`password` varchar(100) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=1 ;

Code:

insert into users (username, password) values ('Will', SHA1('my_password'));

Additionally, I am using SHA1 instead of MD5. (Would like to use sha512 and add salt, but for now, I just need functionality)

models/user.php model:

Code:

<?php
Class User extends CI_Model
{
  function login($username, $password)
  {
   $this -> db -> select('id, username, password');
   $this -> db -> from('users');
   $this -> db -> where('username = ' . "'" . $username . "'");
   $this -> db -> where('password = ' . "'" . SHA1($password) . "'");
   $this -> db -> limit(1);
  
   $query = $this -> db -> get();
  
   if($query -> num_rows() == 1)
   {
    return $query->result();
   }
   else
   {
    return false;
   }
  }
}
?>

controllers/admin.php

Code:

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');

class Admin extends CI_Controller {

public function __construct()
{
  parent::__construct();
  $this->load->model('user','',TRUE);
}

public function index()
{
  
  
}

function verify()
{
  $this->load->library('form_validation');
  
  $this->form_validation->set_rules('username', 'Username', 'trim|required|xss_clean');
  $this->form_validation->set_rules('password', 'Password', 'trim|required|xss_clean|callback_check_database');
  
  if($this->form_validation->run() == FALSE)
  {
   //NEED TO DISPLAY ERROR MESSAGE FOR LOGIN FAILED
   // Message will live for 5 seconds in a jquery div at the top of views/header.php.
   redirect('main', 'refresh');
  }
  else
  {
   //NEED TO DISPLAY ERROR MESSAGE FOR LOGIN SUCCESSFUL
   // Message will live for 5 seconds in a jquery div at the top of views/header.php.
   redirect('main', 'refresh');
  }

}

function check_database($password)
{
  $username = $this->input->post('username');

  $result = $this->user->login($username, $password);

  if($result)
  {
   $sess_array = array();
   foreach($result as $row)
   {
    $sess_array = array(
     'id' => $row->id,
     'username' => $row->username
   );
    $this->session->set_userdata('logged_in', $sess_array);
   }
   return TRUE;
  }
  else
  {
   $this->form_validation->set_message('check_database', 'Invalid username or password');
   return false;
  }
}

function logout()
{
  $this->session->unset_userdata('logged_in');
  session_destroy();
  redirect('main', 'refresh');
}

}

controllers/main.php

Code:

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');

class Main extends CI_Controller {

public function __construct()
{
  parent::__construct();
  $this->load->view('header');
}

public function index()
{
  if ($this->session->userdata('logged_in'))
  {
   $session_data = $this->session->userdata('logged_in');
   $data['username'] = $session_data['username'];
  }
  $this->load->view('blog');
  $this->load->view('footer');
  
}
}

views/header.php

Code:

...
<div id="login_form" title="Login">
&lt;?php echo validation_errors(); ?&gt;
&lt;?php echo form_open('admin/verify'); ?&gt;
  &lt;input id="username" type="text" name="login_username" value=""&gt;
  &lt;input id="password" type="password" name="login_password" value=""&gt;
  &lt;input id="login_button" type="submit" name="submit_login" value="Login"&gt;
&lt;/form&gt;
</div>

&lt;?php if ($this->session->userdata('logged_in'))
{
  $this->load->view('panel');
} ?&gt;
...

As i stated before, I am going to eventually add SHA512 and Salt, and I am going to add a password reset feature as well, but for now, I would just like to get something working first. Thanks for the help in advance.