Can i map more than one table in a CMP ? What is the difference between CMP 1.1 and CMP 2.0 ?
2. EJB 2.0 CMP offers more than persistence of properties. It introduces the notion of CMRs (relationships between entity beans running in the same EJB container). This enables fine-grained entities to be used to model individual tables in an RDBMS.
Relationships involve local, not remote, interfaces. An entity bean with a remote interface may have relationships, but these cannot be exposed through its remote interface. EJB 2.0 supports one-to-one, one-to-many and many-to-many relationships. (Many-to-many relationships will need to be backed by a join table in the RDBMS. This will be concealed from users of the entity beans.) CMRs may be unidirectional (navigable in one direction only) or bidirectional (navigable in both directions).