Container Managed Persistence

1. Container Managed Persistence

2. General Guidelines • Home and Remote interfaces are implemented the same as for bean managed persistence • Entity Bean class contains no database access code • Application Deployment Tool generates database access statements • Specify container managed fields when you run the ADT

3. Rules for Container Managed Fields • Must be one of the following types • Java primitive • Java serializable class • Reference of a home interface • Reference of a remote interface • Must be ‘public’ and not ‘transient’ • One field selected as the primary key (using the ADT)

4. Implementing Interfaces • Still have to follow the rules for implementing methods required by the interfaces. • Some methods will be empty • EJBLoad() & EJBStore() • Container implements the code • Only need to add stuff to process data if required by the application. • EJBCreate() • Make your field assignments • Container makes the datbase call once the bean is created

5. Implementing Interfaces (cont) • findByPrimaryKey() • Completely implemented in the container • findByDescription() and findInRange() • Mostly implemented • User adds WHERE clause during deployment (using the ADT).

6. Here’s a link to Java’s example of how to do it using the J2EE RI…. http://developer.java.sun.com/developer/onlineTraining/… EJBIntro/exercises/EntityBean/index.html