The ability to retrieve objects by queries is an essential feature of a persistence service, and for that reason, this book begins with JDO’s query service. Queries are used to find persistent data objects that meet a set of conditions. A JDO query can search for the relevant objects either in the datastore or in a collection of persistent objects in memory.


Query Language Query Object Result Collection Query Interface Candidate Class 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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© David Ezzio 2003

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  • David Ezzio

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