Update function code igniter does not save changes - php

Question

hi am making this edit function in my code igniter hmvc project. i am getting the value of the things i want to edit, and it is posted to the textbox i want to. but, i cannot save the changes. my model is this,
public function update(){
$sql = "UPDATE $this->table SET PROVINCE = ? WHERE PROV_ID = ?";
$input = array(
'PROVINCE' => $this->input->post('PROVINCE'),
'PROV_ID' =>$this->uri->segment(3)
);
// print_r($input);
// exit;
$query = $this->db->query($sql, $input);
return $query;
}
when i print_r the input, it says
Array ( [PROVINCE] => Province [PROV_ID] => )
i think dont get the uri value. how can i fix this?
here is my controller
/// EDIT
public function update(){
$data['content'] = $this->Provinces_Model->getrow();
$data['content_view'] = 'Provinces/edit_view';
$this->templates->admin_template($data);
}
public function update_row(){
if($this->Provinces_Model->update()){
redirect('Provinces/index');
}else{
$this->update();
}
}
}
here is my full model
//// EDIT
public function getrow(){
$this->db->where('PROV_ID', $this->uri->segment(3));
$query = $this->db->get($this->table);
return $query->row();
}
public function update(){
$sql = "UPDATE $this->table SET PROVINCE = ? WHERE PROV_ID = ?";
$input = array(
'PROVINCE' => $this->input->post('PROVINCE'),
'PROV_ID' =>$this->uri->segment(3)
);
// print_r($input);
// exit;
$query = $this->db->query($sql, $input);
return $query;
}
here is my edit view
<?php
echo form_open('Provinces/update_row');
?>
<p>
<label class="field" for="PROVINCE"><span>*</span>Province Name:</label>
<input type = "text" name="PROVINCE" class ="textbox-300" value= "<?php echo $content->PROVINCE; ?>">
<label class = "error"><?php echo form_error("PROVINCE"); ?></label>
</p>
<?php
echo form_submit('submit','Update');
echo form_close();
?>
here is the part of my table where i click to edit
<td><?php echo anchor("Provinces/update/$i->PROV_ID","<i class='fa fa-edit'>" ); ?></td>

Answer 1

Try this
public function update() {
$input = array(
'PROVINCE' => $this->input->post('PROVINCE'),
'PROV_ID' =>$this->uri->segment(3)
);
$this->db->where('prov_id',$input['PROV_ID']);
$this->db->update('province',$input);
}

Answer 2

get the all segments of URI in an array
For that use this line...
$segs = $this->uri->segment_array();
foreach ($segs as $segment)
{
echo $segment;
echo '<br />';
}
and use that specific key to get the ID or something else!!