vb.net free barcode dll Creating a View Link from the Application Navigator in Java

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Creating a View Link from the Application Navigator
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The first and most obvious option is to create a view link from the Application Navigator. Select File | New and, from the New Gallery dialog, select ADF Business Components and then View Link. This opens the Create View Link wizard. For Name enter InventoryForOrderItemsVL and then click Next. This page is where you define which view objects are to be linked. From Select Source Attribute select OrderItemsView and the ProductId attribute. From Select Destination Attribute select InventoriesView and the ProductId attribute. Click Add, then click Next. The next page allows you to define whether you want an accessor exposed in the source or destination view object. By specifying an accessor, you provide the ability for a view object to programmatically walk to another view object and access attribute values from that view object. It is this functionality that was used to populate CustOrderAvg with the average order based on the OrdersView view object. You can now either click Finish or click Next and accept the default values as you step through the remaining pages of the wizard. You have just defined that there is a master/detail relationship between order items and inventories based on the ProductId. If you now look at the ADF Business Components diagram, as shown in Figure 6-5, you should see the newly created view link linking OrderItemsView and InventoriesView.
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FIGUre 6-5. ADF Business Components diagram showing newly created view links
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Creating a View Link from the ADF Business Components Diagram
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Another way to create a view link is to draw a line between two view objects on the ADF Business Components diagram. With the ADF Business Components diagram open, go to the Component Palette and, under View Objects, select View Link. On the ADF Business Components diagram, click DepartmentsView. This drops an anchor for drawing a line and indicates that DepartmentsView is the master view object. Click on EmployeesView to complete the line and to indicate that EmployeesView is the detail view object. Enter the name EmployeesInDeptVL. You can see this newly created view link in Figure 6-5. So, using the ADF Business Components diagram, you were able to directly link two view objects and create a master/detail relationship. But how did JDeveloper know that this view link was to be based on the DepartmentId Well, because there was already an association between the underlying entity objects, JDeveloper used that as the assumption for this view link.
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You ve now gained some more understanding of and experience using view objects and their features and have built some more functionality into your application. Through the various wizards and dialogs, you have been defining information about your view objects and how they should function. When it comes to running your application, that information is read by a number
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of framework classes to implement the runtime behavior. Generally speaking, and certainly in these early days of learning, you ll never need to change these framework classes. Nevertheless, it s useful to be aware of the main classes involved and what they do. This section provides an outline of these classes, which are covered in more detail in 18.
The Framework Classes
Just like entity objects, there are a number of framework classes that are responsible for taking the definition of features you have built through the JDeveloper dialogs and turning that into runtime behavior.
ViewDefImpl
When you defined your view objects, JDeveloper assembled that information into an XML file. At runtime that metadata information about each view object definition is represented within an instance of oracle.jbo.server.ViewDefImpl. At this stage in your learning, you ll probably never need to alter the way this works.
ViewObjectImpl
For every instance of a view object in the data model, the framework instantiates a separate instance of oracle.jbo.server.ViewObjectImpl. This class is responsible for managing the view object query and the rows queried. Typical methods available on this class include setting bind variables, changing a where clause, executing a query, and navigating through the view object rows.
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