which method of model to update the row in cakephp - cakephp

Question

i have trouble in creating method in controller of cakephp to update the my existing row in a table, can anyone suggest me appropriate model method to update the row in table
<?php
class UsersController extends AppController
{
public function update($id)
{
if(isset($_REQUEST['update']))
{
// method of model to update the row
}
else
$this->set('user',$this->User->find('first',array('conditions'=>array('id'=>$id))));
}
}
?>

Answer 1

http://book.cakephp.org/2.0/en/models/saving-your-data.html#model-save-array-data-null-boolean-validate-true-array-fieldlist-array
$this->User->id = $id;
$this->User->save($this->request->data);

Answer 2

Try the code.......
<?php
class UsersController extends AppController {
public function update($id = null) {
if ($id) {
if ($this->request->is('post')) {
$this->User->id = $id;
$this->User->save($this->request->data);
} else {
$this->set('user', $this->User->find('first', array('conditions' => array('id' => $id))));
}
}
}
}
?>

Answer 3

#burzum after reading the tutorial which link provide by you i found the solution to the my problem, in model updateAll() method available in model by using this i have update row of the table.
public function update($id)
{
if(isset($_REQUEST['update']))
{
$this->User->id=$id;
if($this->User->updateAll(array('User.fname'=>"'".$_REQUEST['fname']."'",'User.lname'=>"'".$_REQUEST['lname']."'",'User.email'=>"'".$_REQUEST['email']."'"),array('id'=>$id)))
echo '<script>alert("update successfully")</script>';
else
echo '<script>alert("failes to update ")</script>';
}
else
$this->set('user',$this->User->find('first',array('conditions'=>array('id'=>$id))));
}