Transcript Contain Managed Persistence

Container Managed
Persistence
General Guidelines
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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
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Specify container managed fields when
you run the ADT
Rules for Container
Managed Fields
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Must be one of the following types
Java primitive
 Java serializable class
 Reference of a home interface
 Reference of a remote interface
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Must be ‘public’ and not ‘transient’
One field selected as the primary
key (using the ADT)
Implementing Interfaces
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Still have to follow the rules for
implementing methods required by the
interfaces.
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Some methods will be empty
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EJBLoad() & EJBStore()
Container implements the code
Only need to add stuff to process data if
required by the application.
EJBCreate()
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Make your field assignments
Container makes the datbase call once
the bean is created
Implementing Interfaces
(cont)
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findByPrimaryKey()
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Completely implemented in the
container
findByDescription() and
findInRange()
Mostly implemented
 User adds WHERE clause during
deployment (using the ADT).
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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