JPA/Eclipselink - Multpile entities in single table

I'm using Eclipselink to map my t开发者_运维问答ables to entities. I have one big database table (actually it's view) with columns like groupId, groupName, categoryId, categoryName etc. I know it's redundand, but we're trying to minimize queries and it's dynamically created view.

The question is: How to map such table to several entities like Group, Category etc?

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You would probably be better off mapping to the real tables and use query optimization to reduce your queries (such as join fetching and batch fetching)

See, http://java-persistence-performance.blogspot.com/2010/08/batch-fetching-optimizing-object-graph.html

If you really want to have several class map to the same table, you will need to have one Entity and make the rest Embeddables.

See, http://en.wikibooks.org/wiki/Java_Persistence/Embeddables