EJBQLQuery has been edited by Andrus Adamchik (Jun 11, 2007).

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Content:

(available since 3.0 in both classic and JPA modes; as of June 2007 only a subset of EJBQL syntax is supported)

EJBQL is an object query language that is not unlike SQL, only it operates in terms of the Java object model. In fact "EJB" in its name is entirely misleading - the language is applicable in the non-"enterprise" environments just as well. Standard EJBQL syntax is specified in the JPA specification, still Cayenne supports it in a classic mode, and no JPA runtime is required to execute such queries. This chapter deals specifically with classic mode operation.

EJBQL Syntax

Details of the syntax are available in various JPA literature. Here is an example of an EJBQL query:

select p from Painting p WHERE p.estimatedPrice > 3000

Visually it looks like SQL, only instead of tables, object entities are used; and instead of columns and joins, path expressions are used (not unlike Cayenne path expressions).

(TODO: would be nice to fill in more examples)

Creating and Running EJBQLQuery

EJBQL vs. SelectQuery

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