Hello,

I have a class A that has a one-to-one relationship with class B

The mapping of class A is of the form:

<class name="A" table="A">
<id name="id" column="B_Id_FK" type="long">
<generator class="native"/>
</id>

<one-to-one name="bRef"
class="B"
constrained="true"
cascade="all"
/>
</class>

but class B doesnot have any reference to A. The mapping is thus unidirctional. Since I have
specified cascade=all thus when I'll create a new instance of both the classes and try to save
them by:
A a = new A();
B b = new B();
b.setBRef(b);
session.save(b);

I expect that both will be saved in the order that first A and then B.
But the result that I get is that 1st A gets saved and then B but Hibernate does not set the
foreign key B_Id_FK in Table B. Hence B gets saved with NULL in its foreign key.

The only way out of this problem seems to be that id generator of A be set to "assigned"
and 1st A be saved then assign A's id to B: b.setId(Aid)

Isn't there any way in Hibernate that I can save both the classes A and B in one go? Am I missing something here?

Thanx in advance for any suggestions and tips

Actually I do not understand why you expeca A will be saved if you use



Association exists from A to B and not vice versa. Also, "cascade" is specified for A->B. So how do you expect Hibernate will know to save A?

I suppose you should be saving A and this will cause Hibernate to cascade and save B as well.

Oops!
I reversed the objects for my scenarios.
Please re-consider my problem starting from the code:

A a = new A();
B b = new B();
a.setBRef(b);
session.save(a);

I expect that both will be saved in the order that first B and then A.
But the result that I get is that 1st B gets saved and then A but Hibernate does not set the
foreign key B_Id_FK in Table A. Hence A gets saved with NULL in its foreign key.

The only way out of this problem seems to be that id generator of A be set to "assigned"
and 1st B be saved then assign B's id to A: a.setId(Bid)

Isn't there any way in Hibernate that I can save both the classes A and B in one go? Am I missing something here?

Thanx in advance for any suggestions and tips[/b]

consider "foreign" generator