Hibernate version: 2.1.2

I am trying to implement a one-to-one relationship. A row gets inserted into the "products" table, but not in the "products_one" table.

class Product
{
String id
String name;
double price
ProductOne productOne
}

class ProductOne
{
String id
String aliasname
Product product;
}

Mapping documents:
Product Mapping:

<hibernate-mapping>

<class name="test.hibernate.Product" table="products">


<id name="id" type="string" unsaved-value="null" >
<column name="id" sql-type="char(32)" not-null="true"/>
<generator class="uuid.hex"/>

</id>

<property name="name">
<column name="name" sql-type="char(255)" not-null="true"/>
</property>

<property name="price">
<column name="price" sql-type="double" not-null="true"/>
</property>

<one-to-one
name="productOne"
class="test.hibernate.ProductOne">
</one-to-one>
</class>
</hibernate-mapping>

ProductOne mapping:

<hibernate-mapping>

<class name="test.hibernate.ProductOne" table="products_one">

<id name="id" type="string" unsaved-value="null" >
<column name="id" sql-type="char(32)" not-null="true"/>
<generator class="foreign">
<param name="property">product</param>
</generator>
</id>

<property name="aliasname">
<column name="aliasname" sql-type="char(25)" not-null="true"/>
</property>

<one-to-one
name="product"
class="test.hibernate.Product">
</one-to-one>

</class>

</hibernate-mapping>



Setting up the objects

Product p = new Product();
p.setName(args[0]);
p.setAmount(Integer.parseInt(args[1]));
p.setPrice(Double.parseDouble(args[2]));

//init ProductOne
ProductOne po = new ProductOne();
po.setAliasname("Test");
po.setProduct(p);

p.setProductOne(po);

Code between sessionFactory.openSession() and session.close():
// save product and close session
Transaction t = sess.beginTransaction();
sess.save(p);
t.commit();
sess.close();



Please lend a hand. Like I said, rows are inserted into the products table, but not the "child" table products_one.

Thanks.

Use the many-to-one in one direction and then one-to-one in the reverse direction as suggested in Chapter 6 of Hibernate in Action.

For example:


This is also described in more detail in section 5.1.11 in the Hibernate Reference, and is refered to as "one-to-one with foreign key constraint".

Notice the cascade="save-update" on the Product side, so that when you save instances of Parent, its associated ProductOne gets saved also.

Hope this helps,
Kevin Hooke

I don't want to add anything to <one to one> for it will limit the class of container.

These are quotes from hibernate's reference: (5.1.11. one-to-one)



If you want to cascade the save you have to specify the cascade type:




Lukasz

PS. use 'code' tag around your code - it is easier to read