Sorry for the entry question, but I am new to named queries.

What type of params can be sent into a named query?

Can I send an object into the named query and then use dot notation in the query to do a get on a field?

For instance:

class Phone {
String number;
String ext:
//with getters/setters
}

if I set a param of object Phone setParameter("phone", phone);

Select e
From Phone e
Where e.ext = :phone.ext;

Can this be done?