in addition to jaikiran if you need a subset of attributes of an persistent entity you can use an non persistent class by giving the full qualified class name and lsit all parameters for that constructor (see spec page 100 for more details). The spec says anonymous wrote : | A constructor may be used in the SELECT list to return one or more Java instances. The specified class | is not required to be an entity or to be mapped to the database. The constructor name must be fully qualified. | SELECT Clause Enterprise JavaBeans 3.0, Final Release Query Language | 101 5/2/06 | Sun Microsystems, Inc. | If an entity class name is specified in the SELECT NEW clause, the resulting entity instances are in the | new state. | SELECT NEW com.acme.example.CustomerDetails(c.id, c.status, o.count) | FROM Customer c JOIN c.orders o | WHERE o.count > 100 |
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