Do you mean "take an existing database, query its schema and generate Hibernate files from it"?
There are some Hibernate tools, but last time I checked, what was available and from where were kind of confusing. Maybe they got it straightened out. For that matter, possibly the Eclipse Hibernate plugin can do what you want. I haven't had much luck with
any of the ORM plugins for Eclipse, so I just do it the hard way.
Actually, since there are limits to how hard I want the job to be, what I actually do is use the Apache OpenJPA schema reverse-engineering tools. They can poll a database, create an XML file that represents the schema, and use the information to generate JPA-annotated
java source code. And since Hibernate 3 implements JPA, that code can be used in a Hibernate project. With the added benefit that I don't need the ".hbm" files, since the annotations allow the single Java file to both define the ORM class and the HBM info.
As far as DAOs go, I just basically clone them, although I could create an Eclipse template and maybe some snippets.