You have to tell OJB to use a PersistenField implementation supporting this in OJB.properties first, as it is not yet implemented in the default implementation:
PersistentFieldClass=org.apache.ojb.broker.metadata.fieldaccess.PersistentNestedFieldMaxPerformanceImpl
if your class has an attribute "address" of type Adress,
the mapping for the "street" attribute of "address" would look like follows:
<field-descriptor id="10"
name="adress->street"
column="ADR_STREET"
jdbc-type="VARCHAR"
/>
cheers,
Thomas
Hao Chen wrote:
Hi,
I am new to OJB. I wonder if OJB has something like Hibernate's component mapping, which makes code structure better and reuse easier.
Thanks.
=============================================
From Hibernate Doc:
Write fine-grained classes and map them using <component> or <component-element>.
Use an Address class to encapsulate street, suburb, state, postcode. This encourages code reuse and simplifies refactoring.
component
The <component> element maps properties of a child object to columns of the table of a parent class. Components may, in turn, declare their own properties, components or collections. See "Components" below.
<component name="propertyName" class="className"/>
<property ...../>
........
</component>
name: The name of the property.
class (optional - defaults to the property type determined by reflection): The name of the component (child) class.
The child <property> tags map properties of the child class to table columns.
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