[fw-mvc] Validating/writing data

Hi all,

because of our discussion about "where to put my code" I have found
DAO pattern what I am going to use. I would like to ask you about this
pattern resp. about its proper implementation within ZF.

I have for all application entities own models which cooperates with
proper DAO. DA objects, eg. for Db Tables as data storage, are
extended from Zend_Db_Table_Abstract.

I am looking for how to validate data and then write changes into
database table (yes, I do validation in the model). Eg. this is model
for entity User and we need to insert new account data:

Option A
========
if($this->_getDao()->validateInsert($data)){
$userId = $this->_getDao()->insert($data);
}else{
$messages = $this->_getDao()->getMessages();
}

Option B
========
$actionObject = $this->_getDao()->getInsert($data);

if($actionObject->isValid()){
$userId = $actionObject->execute();
}else{
$messages = $actionObject->getMessages();
}

Option C
========
$userId = $this->_getDao()->insert($data);

if($userId == 0){
$messages = $this->_getDao()->getMessages();
}

What do you think about these three options? What is the best? What is
your best practise when you need validate and then write changes into
some datasource?

Thanks, J.