Hibernate version:2.1.6


What is the best way to map the following association:

A (1..1) --- B (0..1)

The Item/Bid example in HIA shows a similar example but Bid is (0..*).

Class A has a property of B, which, if there is an entry in table B, needs to be set, otherwise a set of defaults are used.

At the moment, I have in A.hbm.xml:
<one-to-one name="b" class="B" property-ref="a"/>

and in B.hbm.xml

<many-to-one name="a" column="a_id" class="A" unique="true"/>


is this what I need?

Separate question - is there a way to specify DB level constraints ( Oracle 8/9 Constraints ) in the mapping file so that I can have these constraints applied for other programs that may be writing to the DB?


Nick