It's me again :)

Is there a way to map a single object to multiple tables?

I'm working on a legacy DB that's a mess and this would greatly simplify things for me.


Also, is returning a saveVeto the easiest way to make an object "read-only", or can this be specified somewhere in the xml file?


Thanks

specifing the attribute mutable="true" in the <class> tag will make the class "readonly", what means that NHibernate will never persist any changes made to this class.

For your other problem: ORM will fit best following the opposite approach, which is persisting an object model to a relational database. If you want to map an existing relational model to an object model you have to make compromises. In my opinion the easiest will be to use NHibernate just as persistence level. You can build a 1:1 mapping (one table, one persistent class). Then you can build a "Business Object" layer based on the Data Mapper pattern (see http://martinfowler.com/eaaCatalog/dataMapper.html), which assembles the objects you need from your base persistent classes.

Regards
Klaus[/url]

Thanks luedi that's exactly what I was looking for


Interestingly enough that's basically what I ended up doing. I wasn't thinking of it in exactly those terms but it's nice to know that I'm on the right track :)