Hi,

i am new to hibernate and want to config the following ont-to-one relation (it's an extract, not the real model):



- I like to navigate the relation from the TASK to the TASKRESULT. The reverse direction is not required.
- I like to get TASKRESULT.id assigned the same value as TASK.id.
- I like to get TASKRESULT deleted automatically when TASK is deleted.

i tried the following mapping:



Now i observe the following problems:

1.) When i try to delete a TASK, associated with a TASKRESULT, i get a integrity constraint violation, because TASKRESULT.id is a FOREIGN KEY of TASK.id. How do i tell hibernate to delete the TASKRESULT before deleting TASK?

2.) I do not want to navigate from TASKRESULT to TASK. So how do i have to config TASKRESULT to get the TASKRESULT.id assigned with the same value as TASK.id but without the need to declare a property task in the class TaskResult?

Thx for any suggestions, i am a bit clueless. I did study the documentation and the web for more than 4 hours now.

Thx and best regards,

JDon

Have you tried moving the constrained="true" to the Task one-to-one mapping?

There is information in the reference document (6.1.11. one-to-one):
...
Now we must ensure that the primary keys of related rows in the PERSON and EMPLOYEE tables are equal. We use a special Hibernate identifier generation strategy called foreign.
...

and (22.3. Cascading lifecycle):
...
Now, in our case, a Child can't really exist without its parent. So if we remove a Child from the collection, we really do want it to be deleted. For this, we must use cascade="all-delete-orphan".
...