title: how to Update a field in Cakephp
body: <p>i am newbie in Cakephp so I feel difficulties to implement the database queries .. what i want is I want to update a mobile Number where email is equal to  the one the user has given .. 
  this is the query which i want to implement</p>
  
  <pre><code>        "Update Users set  mobileNo = $mobileNo  where email = $email"
  </code></pre>
  
  <p>I am doing this </p>
  
  <pre><code>      $mobileNo = $data['mobileNo'];
          $email = $data['$email'];
  
  
          $count = $this-&gt;User-&gt;find('count', array(
              'conditions' =&gt; array('User.email' =&gt; $email)));
  
          if($count&gt;0){
  
              $email = $this-&gt;User-&gt;field(
                  'email',
                  array('User.mobileNo' =&gt; $mobileNo));
              echo $email;
  
              $this-&gt;User-&gt;saveField("mobileNo",$mobileNo);
  </code></pre>