Specifying distinct sequence per table in Hibernate on subclasses
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Published on 2010-12-30T07:25:55Z
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Is there a way to specify distinct sequences for each table in Hibernate, if the ID is defined on a mapped superclass?
All entities in our application extend a superclass called DataObject
like this:
@MappedSuperclass
public abstract class DataObject implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.SEQUENCE)
@Column(name = "id")
private int id;
}
@Entity
@Table(name = "entity_a")
public class EntityA extends DataObject { ... }
@Entity
@Table(name = "entity_b")
public class EntityB extends DataObject { ... }
This causes all entities to use a shared sequence, the default hibernate_sequence
.
What I would like to do is use a separate sequence for each entity, for example entity_a_sequence
and entity_b_sequence
in the example above. If the ID were specified on the subclasses then I could use the @SequenceGenerator
annotation to specify a sequence for each entity, but in this case the ID is on the superclass. Given that ID is in the superclass, is there a way I can use a separate sequence for each entity — and if so, how?
(We are using PostgreSQL 8.3, in case that's relevant)
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