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

 

See Also

EJB query language
Using EJB query

 

---