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User Guide
The information contained in this section applies to IBM WebSphere Commerce Version 7.0.0.9 and Feautre Pack 8. The documentation also applies to all subsequent releases and modifications until otherwise indicated in new editions.
Developing
The topics in the Developing section describe tasks performed by an application developer.
Persistent object model
WebSphere Commerce deals with a large amount of persistent data. There are numerous tables defined in the current database schema. Even with this extensive schema, however, you might need to extend or customize the database schema for your particular business needs.
WebSphere Commerce enterprise beans
The persistence layer within the WebSphere Commerce architecture is implemented according to the EJB component architecture. The EJB architecture defines two types of enterprise beans: entity beans and session beans. Entity beans are further divided into container-managed persistence (CMP) beans and bean-managed persistence (BMP) beans.
Extending the WebSphere Commerce object model
Application requirements may lead you to extend the existing WebSphere Commerce object model. The WebSphere Commerce object model can be extended in two ways.
Extending the WebSphere Commerce object model with entity beans
One situation that merits an extension to the existing WebSphere Commerce object model is addition of attributes to your application.
Setting the optimistic locking option of the bean
If your bean will use optimistic locking, set the optimistic locking option in the deployment descriptor.

Setting the optimistic locking option of the bean

If your bean will use optimistic locking, set the optimistic locking option in the deployment descriptor.

Before you begin

You have set the security role of the bean

Procedure

In the Deployment Descriptor editor, select the Bean tab.
Select your bean and select Enable optimistic locking in the Concurrency Control section.
Save your work and then close the Deployment Descriptor editor.
Proceed to modifying the entity context fields and methods.