Web hosting e commerce - Creating CMP entity beans from an imported data
Creating CMP entity beans from an imported data source Note You can also add field groups using the EJB Module DD editor. Select the entity bean in the structure pane when the EJB Module DD editor is visible and click the WebLogic Persistence tab to see the page where you add field groups to the deployment descriptors. Click the Add button to display the Field Group editor. Entity bean field and method inspectors The inspector for an entity bean field looks like this: Use the inspector to change the field name, if you wish. You can specify the field s type, specify whether its value will be persisted, specify whether the field is a primary key for the table, specify if you want the field s value set in the ejbCreate() method in the bean class, specify where the field s access methods are defined, and map the field to the appropriate column in the table. If WebLogic Server 7.x or 8.x is your target, you can also specify the database column type (dbms-column-type); your choices are OracleClob, OracleBlob, LongString, and SybaseBinary, or the default value of none. The method inspector for entity beans is the same one used for session and message- driven beans. See Adding a new method on page 28 if you want more detail. Creating entity bean relationships Note You cannot use the EJB designer to create relationships between EJB 1.1 entity beans. To create relationships between EJB 1.1 entity beans, use the EJB 1.x Entity Bean Modeler. For more information see Chapter 9, Creating EJB 1.x entity beans from an existing database table. You can create relationships between EJB 2.0 entity beans. For example, if you have a Department table and an Employee table, you might want to create a relationship that reflects which employees are in which departments. In this example, you would right- click the Department bean representation in the EJB designer pane and choose Add| Relationship or click the Add icon on the toolbar and choose Relationship. When you do, a new field appears in the Department bean. Then click the Employee bean and a line 52 Developing Applications with Enterprise JavaBeans
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