set login session in codeigniter code example

Example 1: codeigniter login system with session

<!DOCTYPE html>  
 <html>  
 <head>  
      <title>Webslesson | <?php echo $title; ?></title>  
      <link rel="stylesheet" 

href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" />  
 </head>  
 <body>  
      <div class="container">  
           <br /><br /><br />  
           <form method="post" action="<?php echo base_url(); ?>main/login_validation">  
                <div class="form-group">  
                     <label>Enter Username</label>  
                     <input type="text" name="username" class="form-control" />  
                     <span class="text-danger"><?php echo form_error('username'); ?

></span>                 
                </div>  
                <div class="form-group">  
                     <label>Enter Password</label>  
                     <input type="password" name="password" class="form-control" />  
                     <span class="text-danger"><?php echo form_error('password'); ?

></span>  
                </div>  
                <div class="form-group">  
                     <input type="submit" name="insert" value="Login" class="btn btn-info" />  
                     <?php  
                          echo '<label class="text-danger">'.$this->session->flashdata

("error").'</label>';  
                     ?>  
                </div>  
           </form>  
      </div>  
 </body>  
 </html>

Example 2: codeigniter login with session

<?php  
 class Main_model extends CI_Model  
 {  
      function can_login($username, $password)  
      {  
           $this->db->where('username', $username);  
           $this->db->where('password', $password);  
           $query = $this->db->get('users');  
           //SELECT * FROM users WHERE username = '$username' AND password = '$password'  
           if($query->num_rows() > 0)  
           {  
                return true;  
           }  
           else  
           {  
                return false;       
           }  
      }  
 }

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