Hi Guys

I am new to Hibernate and it looks like a great tool.

I have seen in a few places that you can not map two classes to the same set of rows. However can you map two collection properties of one class to overlapping rows. Consider an a Parent class with two properties allChildren of type Child and maleChildren of type Child. The second property is just a subset of the first property. Can I map these as two properties where the second property will have some extra filter condition. Or should I map just the first property and use some other means to find the subset I need.

I have a similar issue with an association table between two classes. The assocation table holds a bit of extra data so it also appears in the object model as a seperate java class. Consider a schema where A and B are related via an association table Assoc. At the java level it would be good if I could have two properties in A one of type Assoc and one of type B. This involces in mapping both these properties to the same rows in the association table. Is this legal, is there a design pattern to resolve this problem?

I thank you in advance

AFAIK you can do this by setting update and insert to false for one of the colections and add an a where clause.

An other, more flexible approach is to have DAO layer (IMHO a good idea anyway) and wirte dedicated finder methods using HQL.

HTH
Ernst