Doing some work on a little project of mine while waiting for the keynote to start. What I'm doing is writing a form that needs to make sure that a record is unique in the DB. Doing that in ZF is really easy. Simple set your validator as Db_NoRecordExists. What this does is during the Zend_Form::isValid() functionality it will query the database as part of the validation process. The only parameters you really need are the table and the field if you have already set a default adapter for your Zend_Db models. That makes it really easy to use. Here's a slice of how I did it.
class Form_Tweepeater extends Zend_Form
public function init()
'label' => 'Hashtag to watch for (no #)',
'filters' => array(
array('PregReplace', '/#/', '')
'validators' => array(
'table' => 'tweepeat_message',
'field' => 'tweepeat_hash'
'required' => true
If there is a match I get a message through the regular validation channel saying "A record matching asdf was found", if "asdf" is what you submitted. Like I said, nice and easy.