one-to-one mapping

pulihora1 · **Joined:** Mon Dec 22, 2003 6:21 pm **Posts:** 1

I have two classes Customer (1 <----> 1) CreditCard.
// works fine

Code:

Customer c = new Customer(..);
CreditCard cr = new CreditCard(..);
c.setCard(cr);
cr.setCustomer(c);
session.store(c); 

// does not work
Afterwards If i want to set new Card for the customer

Code:

Customer c = findCustomerById(...);
CreditCard card = new CreditCard(...);
c.setCard(card);
card.setCustomer(c);
session.store(c); 

there is a exception that java.sql.BatchUpdateException: Invalid argument value, message from server: "Duplicate entry '1' for key 1"

xml Mapping for corresponding elements..
card to customer
<one-to-one
name="customer"
class="rrr.titan.entity.Customer"
cascade="all"
/>

customer to card
<one-to-one
name="creditCard"
class="rrr.titan.entity.CreditCard"
cascade="all"
outer-join="auto"
constrained="false"
/>

I tried modifying generator class for CreditCard id to foriegn it did not solve the problem.

My Question is how to update 1 <----> 1 relations ?

emmanuel · **Posted:** Mon Dec 22, 2003 8:04 pm

primary keys of one-to-one related classes must have the same value (same PK)
It seems that you already have an existing CreditCard with id of Customer. and ask Hibernate to insert it like a new one.
Read it and update it or delete it an create it.