Understanding EclipseLink, 2.4
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About Advanced Native Query Support

EclipseLink provides an expression framework (also known as EclipseLink Native Query Support) with which you can express queries in a database-neutral fashion as an alternative to SQL when writing queries not supported by JPQL. EclipseLink expressions offer the following advantages over SQL when you access a database:

EclipseLink automatically generates the appropriate SQL from the specified expression.

The expression framework lets you work with expressions, database queries, call objects, and native queries.