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Building the client side In this example, the event handler calls a findAll() method to return all the entity beans. You can call any finder you want. You could use the EntityBeanProvider’s parameterRow property to dynamically determine which finder to call and/or which parameters to pass. For resolving, the EntityBeanResolver can by default determine how to apply updates and deletes. But it can t automatically determine how to create new entity beans because there is no way it can determine which create() method to call and which parameters to pass to it. So, if you want to add a row to the data source, you must add the create event yourself and supply the necessary logic. You can use the Inspector to add the skeleton create event code to your session bean. You can see an example of a create event in the EjbDx.jpx sample project. You can also use the other events available in EntityBeanResolver to override the default behavior, if you choose. Deploy the session and entity beans to the application server. For more information about deploying your beans, see Deploying to an application server on page 112. Building the client side Now that you ve created the entity beans and the session bean that accesses them and deployed them to your target application server, you re ready to begin building the client. Follow these steps: 1 Create a data module. Choose File|New|General|Data Module. 2 From the component palette, select the EjbClientDataSet and add it to the data module. 3 From the component palette, select the SessionBeanConnection and add it to the data module. 4 In the Inspector, set the sessionBeanConnection property of the EjbClientDataSet to the name of the SessionBeanConnection component. 5 In the Inspector, specify a name for the methodName property of the EjbClientDataSet component. The methodName property determines how the methods that provide and resolve data are named. For example, if you specify a value of Employee for methodName, the session bean methods to provide and resolve data become provideEmployee() and resolveEmployee(). Later you will need to add these methods to the session bean you create. 6 In the Inspector or directly in the source code, set the jndiName property of the SessionBeanConnection component. Or you can specify the name of the remote interface of the session bean you will create instead as the value of the sessionBeanRemote property. You can also use the Inspector to add a creating event to your SessionBeanConnection. Code you add to the event handler can control the creation of the session bean after the JNDI lookup occurs. Usually you must add a creating event if you want to invoke a create() method on the home interface that requires parameters. For example, look at this code: import com.borland.dx.dataset.*; import com.borland.dx.ejb.*; public class PersonnelDataModule implements DataModule { private static PersonnelDataModule myDM; SessionBeanConnection sessionBeanConnection = new SessionBeanConnection(); EjbClientDataSet personnelDataSet = new EjbClientDataSet(); 146 Developing Applications with Enterprise JavaBeans
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This entry was posted on Wednesday, January 16th, 2008 at 3:30 am and is filed under JBuilder Blog. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.