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A.4 Components
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The basic component is a one-to-one relationship between an entity and a child value object. The value object s data is contained with the parent table, and has no identity of its own. A component is typically unidirectional, but if necessary the component can have a reference to its parent class, as shown in figure A.4.
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Location
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Address
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Figure A.4 Component: Location to Address
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A.4.1 Unidirectional
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A component has the property information in the component (Address) and the component relationship detailed in the parent entity object:
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/** * @hibernate.class table="locations" */ public class Location implements Serializable{ private Long id; private Address address = new Address(); /** * @hibernate.id generator-class="native" column="id" * @return */ public Long getId() { return id; } public void setId(Long id) { this.id = id; } /** * @hibernate.component */ public Address getAddress() { return address; } public void setAddress(Address address) { this.address = address;
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APPENDIX
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The complete Hibernate mapping catalog
} } /** No hibernate.class tag or identity field needed. */ public class Address implements Serializable { /** * A sample property, the name of a city. * @hibernate.property column="city" */ public String getCity() { return city; } public void setCity(String city) { this.city = city; } }
The final result, either generated via XDoclet or written by hand, is a single mapping single file, the entity s hbm.xml file. For this example, it looks like this:
<class name="com.manning.hq.apdxA.Location" table="locations"> <id name="id" column="id" type="java.lang.Long"> <generator class="native"/> </id> <component name="address" class="com.manning.hq.apdxA.Address"> <property name="city" type="java.lang.String" column="city" /> </component> </class>
Table schema
There s only a single table, since the component, Address, is bound by its parent, Location.
locations id city
A.4.2 Bidirectional
To make a component bidirectional, you must add a field that refers to the parent object. The component mapping then gets a <parent>
Set: one-to-many
element, which refers back to the original object. As of XDoclet 1.2.2, there is a @hibernate.parent tag, which generates the <parent> element. Specifying it on the location property binds the Location to the Address component, making the relationship bidirectional, as shown here:
public class Address implements Serializable { /** * @hibernate.parent */ public Location getLocation() { return location; } public void setLocation(Location location) { this.location = location; } }
The following is the mapping file for the Location and its contained Address component, which has a link back to the parent Location:
<class name="com.manning.hq.apdxA.Location" table="locations"> <component name="address" class="com.manning.hq.apdxA.Address"> <parent name="location"/> <!-- Other properties omitted --> </component> </class>
Note that for XDoclet to generate the Location.hbm.xml correctly, you must specify the location field first before all the other properties on the Address object. Otherwise, the XDoclet will generate an invalid hbm.xml file (according to the DTD). The <parent> element has to come first, before the <property> elements.
A.5 Set: one-to-many
There are many flavors of collections, the most basic and common of which is the one-to-many set (see figure A.5). The basic contract of
APPENDIX
The complete Hibernate mapping catalog
is that every element must be unique but there are no guarantees on the order. In Hibernate, each element of the one-tomany set is linked back to the parent object via a foreign key. Hibernate allows you to sort sets in memory, using a naturally sorted collection or at query time using an order-by clause.
java.util.Set
Event
Speaker
Figure A.5 One-to-many set: Event to Speaker
A.5.1 Unidirectional
In a unidirectional set, the parent object has a collection, but the objects in the collection have no parent object field:
public class Event implements Serializable { private Set speakers = new LinkedHashSet(); /** * @hibernate.set * @hibernate.collection-key column="event_id" * @hibernate.collection-one-to-many * class="com.manning.hq.apdxA.Speaker" */ public Set getSpeakers() { return speakers; } public void setSpeakers(Set speakers) { this.speakers = speakers; } }
The speaker table will have an event_id column, which will link each Speaker instance to a single Event. The resulting mapping fragment should look like this:
<class name="com.manning.hq.apdxA.Event" table="events"> <set name="speakers">
Set: one-to-many
<key column="event_id" /> <one-to-many class="com.manning.hq.apdxA.Speaker" /> </set> </class>
Table schema
Each speaker needs its foreign key back to the events table:
speakers id event_id events id
A.5.2 Bidirectional
The opposite end of a bidirectional one-to-many association is a manyto-one on the object in the collection. In this case, the Speaker object would have an Event field, which points back to the Event object. Here s the modified Speaker class with that field:
public class SpeakerBidirectional implements Serializable { private Event event; /** * @hibernate.many-to-one column="event_id" */ public Event getEvent() { return event; } public void setEvent(Event event) { this.event = event; } }
Note that the many-to-one column (event_id) must match the one declared column on the Event.speakers field. Here s what the mapping fragment will look like:
<class name="com.manning.hq.apdxA.Speaker" table="speakers"> <many-to-one name="event" class="com.manning.hq.apdxA.Event" column="event_id" /> </class>
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