retrieve studentinformation in another page in codeigniter - codeigniter

Question

I have a problem about retrieving again in another page of student information.
I can view all students using this through model and view:
public function viewdata()
{
$this->db->order_by("Idnumber", "asc");
$query= $this->db->get('studentinformation');
return $query->result();
}
<table class=" table table-hover ">
<thead>
<tr>
<th>ID Number</th>
<th>Firstname</th>
<th>Middlename</th>
<th>Lastname</th>
<th>Sex</th>
</tr>
</thead>
<?php
foreach($this->model_adminlogin->viewdata() as $row){
?>
<tbody>
<tr>
<td><?php echo $row->Idnumber?></td>
<td><?php echo $row->Firstname?></td>
<td><?php echo $row->Middlename?></td>
<td><?php echo $row->Lastname?></td>
<td><?php echo $row->Sex ?></td>
<td>
Option
</td>
</tr>
</tbody>
<?php
}
?>
</table>
also I can view them every student information using this in model and controller and view:
function getonerow($id)
{
$this->db->where('Id',$id);
$query=$this->db->get('studentinformation');
return $query->row();
}
public function viewspecific($id)
{
if($this->session->userdata('logged_in'))
{
$this->output->set_header('Expires: Sat, 26 Jul 1997 05:00:00 GMT');
$this->output->set_header('Cache-Control: no-cache, no-store, must-revalidate, max-age=0');
$this->output->set_header('Cache-Control: post-check=0, pre-check=0', FALSE);
$this->output->set_header('Pragma: no-cache');
$session_data = $this->session->userdata('logged_in');
$data['Username'] = $session_data['Username'];
$row=$this->model_adminlogin->getonerow($id);
$data['r']=$row;
$this->load->view('individualviewstudent',$data);
} else{
redirect('welcome', 'refresh');
}
if((!isset($session_data) || $session_data !=TRUE)) {
redirect('welcome', 'refresh');
}
}
and view using $r
<label class="z label-primary">Name:</label> <span class="z"> <?php echo $r -> Firstname." ". $r-> Middlename." ".$r-> Lastname; ?></span><br>
</div>
<div class="spacesz">
<label class="z label-primary">Id Number: </label><span class="z"> <?php echo $r->Idnumber; ?></span>
</div>
<div class="spacesz">
<label class="z label-primary">Age:</label><span class="z"> <?php echo $r-> Age; ?></span>
</div>
etc.......................................................................................
my problem now how can I retrieve again to another view page with that student I click for my updating purpose?? this is my image of the problem ->
retrieve in another page of that student

Answer 1

Use the id available in the object $r.
<?php echo site_url('student/update/'.$r->Id) ?>
Place the above code in your Update Student link. Like below:
Update Student