Update DB row in codeigniter, by id - php

Question

I'm trying to update a row in DB using ID. I realized you could do it through the URI SEGMENT But there is another way as the variable $ GET. For some reason it fails to update.
Another question, why when I do the URI SEGMENT IF it does not work? Sample code: if ($ this-> uri-> segment (3)) === false) ...
For some reason, the condition does not work. Thank assistants.
the model:
public function updata_user($data) {
$this->db->where('id', $this->uri->segment(3));
$this->db->update('users', $data);
}
}
the controller:
public function save() {
$data = array(
'name' => $this->input->post('name'),
'email' => $this->input->post('email'),
'password' => $this->hash($this->input->post('password'),TRUE)
);
if ($this->uri->segment(3) === false) {
$this->users_model->insert_user($data);
redirect('users/index');
}
else {
$result = $this->users_model->updata_user($data);
if ($result) {
redirect('users/index');
}
}
}
the view:
<?php echo validation_errors(); ?>
<?php echo form_open('users/save'); ?>
<table class="table">
<tr>
<td>Name</td>
<td><?php echo form_input('name', set_value('name', $user->name)); ?></td>
</tr>
<tr>
<td>Email</td>
<td><?php echo form_input('email', set_value('email', $user->email)); ?></td>
</tr>
<tr>
<td>Email</td>
<td><?php echo form_input('id', set_value('id', $user->id)); ?></td>
</tr>
<tr>
<td>Password</td>
<td><?php echo form_password('password'); ?></td>
</tr>
<tr>
<td>Confirm password</td>
<td><?php echo form_password('password_confirm'); ?></td>
</tr>
<tr>
<td></td>
<td><?php echo form_submit('submit', 'Save', 'class="btn btn-primary"'); ?></td>
</tr>
</table>
<?php echo form_close();?>

Answer 1

You can put id in hidden input and using $this->input->post('id') you can using that in model
View
<tr>
<td>id</td>
<td><?php echo form_hidden('id',$user->id); ?></td>
</tr>
Model
public function updata_user($data)
{
$this->db->where('id', $this->input->post('id'));
$this->db->update('users', $data);
}