[jboss-user] [EJB 3.0] - Re: InheritanceType JOINED stategy problem

grdzeli_kaci do-not-reply at jboss.com
Wed Mar 14 04:12:59 EDT 2007

"rajeshv7" wrote : I think you have mixed up the 'SINGLE_TABLE' and 'JOINED' Inheritance strategies. The Discriminator's are specified only in the 'SINGLE_TABLE'  strategy. And in the 'Joined'  since all the subclasses have their own tables there is no need for a discriminator column.

you are not right! 

The Discriminator's are not specified only in the 'SINGLE_TABLE' strategy. it is possible to use into join strategy.

i have book "Pro EJB3 Java Persistence API" (Mike Keith and Merrick Schincariol)

on page 249 is defined joined strategy and tehere is data model in example Employee, FullTimeEmployee,PartTimeEmployee and ContractEmployee using Joined Strategy.

  find out here Example 1-74

Is There any idea ?

I can't resolve this problem

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