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Thorick Chow

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The standard EJB 2.0 container- managed persistence (CMP) query language known as EJB QL allows users to retrieve container-managed entity beans, subject to constraints that are described using the same object-relationship model that was constructed to describe beans in EJB deployment. With this language you can reduce large classes of search problems to the task of writing queries that can be expressed in a straightforward and natural manner. Some classes of problems can't be solved using the capabilities of standard EJB QL, however. One such class can be described intuitively as "that class of problems for which a single scan of the retrieval candidates isn't enough to narrow down the beans that qualify to be selected." For example, suppose you have a set of beans that represent recordings. You want to find the set of recordings whose sales totals are above the av... (more)