IBM WebSphere: Deployment and Advanced Configuration

Schema Mapping

Entity Beans need to be mapped to the underlying data representation. WAS application developers who deploy Entity Beans usually make use of the tools provided within WebSphere Studio or the ASTK to map Entity Beans to the underlying data store. WAS provides three different ways to map a set of Entity Beans to an underlying data store:

• Top-down mapping— This mapping generates an actual database schema out of an existing set of Entity Beans. With this methodology, no database exists yet, and the Entity Bean model will be used to create your database. Top-down mapping can be generated at application deployment time as well.

• Meet-in-the-middle mapping— Here, we map an existing set of Entity Beans to an existing data base. This is ...