October 2006
Intermediate to advanced
880 pages
22h 11m
English
Content preview from Java Persistence with Hibernate
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12.1. Transitive persistence
Real, nontrivial applications work not only with single objects, but rather with networks of objects. When the application manipulates a network of persistent objects, the result may be an object graph consisting of persistent, detached, and transient instances. Transitive persistence is a technique that allows you to propagate persistence to transient and detached subgraphs automatically.
For example, if you add a newly instantiated Category to the already persistent hierarchy of categories, it should become automatically persistent without a call to save() or persist(). We gave a slightly different example in chapter 6, section 6.4, "Mapping a parent/children relationship," when you mapped a parent/child relationship ...
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