Inheritance in EJB query

 

If an EJB inheritance hierarchy has been defined for an abstract schema, using the abstract schema name in a query statement implies the collection of objects for that abstract schema as well as all subtypes.

 

Example: Inheritance

Suppose that bean ManagerBean is defined as a subtype of EmpBean and ExecutiveBean is a subtype of ManagerBean in an EJB inheritance hierarchy. The following query returns employees as well as managers and executives:

SELECT OBJECT(e) FROM EmpBean e

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Related concepts

EJB query language

 

Related tasks

Use EJB query