title: Update multiple columns with Doctrine in Symfony
body: <p>I have to update multiple columns in Symfony, but I can nowhere find the solution...
  So, I'd like to do it in this way:</p>
  
  <pre><code>$q = Doctrine_Query::create()
       -&gt;update('WebusersTable q')
       -&gt;set('q.login_name','?','John')
       -&gt;where('q.webuser_id=?',1)
       -&gt;execute();
  </code></pre>
  
  <p>OK, that works, but I have to do it with several columns.
  I tried something like this, but it doesn't work:</p>
  
  <pre><code>$q = Doctrine_Query::create()
       -&gt;update('WebusersTable q')
       -&gt;set('q.login_name,q.name','?','kaka,pisa')
       -&gt;where('q.webuser_id=?',1)
       -&gt;execute();
  </code></pre>