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Java Persistence with Hibernate
book

Java Persistence with Hibernate

by Gavin King, Christian Bauer
October 2006
Intermediate to advanced content levelIntermediate to advanced
880 pages
22h 11m
English
Manning Publications
Content preview from Java Persistence with Hibernate

6.1. Sets, bags, lists, and maps of value types

An object of value type has no database identity; it belongs to an entity instance, and its persistent state is embedded in the table row of the owning entity—at least, if an entity has a reference to a single instance of a valuetype. If an entity class has a collection of value types (or a collection of references to value-typed instances), you need an additional table, the so-called collection table.

Before you map collections of value types to collection tables, remember that value-typed classes don't have identifiers or identifier properties. The lifespan of a value-type instance is bounded by the lifespan of the owning entity instance. A value type doesn't support shared references.

Java has ...

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