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The Role of the Entity Object
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The good news is, you can. Going back to the Edit Attribute dialog for CustomerId, set Value Type to Expression and enter adf.object.nextVal("Customer_seq"); for Value. This is a special notation using a scripting language called Groovy, more of which is covered later in the book. At this point, all you need to know is that the notation adf.object allows you to access methods on the CustomersEntityImpl instance. Thus, when a default value is required for CustomerId, the framework will automatically call this method.
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You now have a deeper understanding of the features of entity objects and associations and have learned that: You can quickly create and visualize entity objects. An entity object can be synchronized with database changes. Oracle ADF provides mappings between database types and Java types. Domains are specialized classes that simplify type mapping. An entity object attribute can be set to be updatable: Always, Never, or While New. An entity object can define hints for labels, help, and data formatting. Associations define relationships between entity objects. Oracle ADF uses framework classes to implement the entity object functionality. These framework classes can be subclassed and exposed so you can add your own code. You can define a database sequence for an entity object attribute.
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With your new-found understanding of entity objects, you should feel at ease exploring the various features and testing through the ADF Business Component Browser. The next chapter will extend this knowledge into view objects.
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View Objects: A Window to Your Data
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o far, you ve pretty much relied on your database model to drive your business services development, which is a reasonable approach given that a sizable proportion of your application will typically be manipulating that data. However, what makes for a good database design doesn t necessarily reflect the way your application will expose data to your end user or the developer consuming your business service. This is where view objects are used to shape your underlying data sources into application-specific views. This chapter shows how to create, manage, and edit view objects, including how you can create view objects from different underlying data sources, build master/detail relationships, and define default and calculated values for view object attributes.
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Understanding View Objects
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If you picture entity objects as database tables inside your application, then a view object is like a database view on those tables. And just like a database view, a view object definition is more or less just a select statement that shapes, filters, joins, and orders application data. For each view object, the framework automatically creates a runtime instance of a view object cache. This view object cache doesn t hold any rows of data as such, but is instead a collection of pointers to rows in the underlying entity object. It is this view object cache that is bound to a UI item, like a table, so that you see the queried records and attributes as defined by your view object. For example, if you had a view object for U.S. customers and a view object for high-earning global customers, there would be two view object caches containing different view rows. As shown in Figure 6-1, each view object row is pointing to a physically cached row in the same Customers entity object. Sometimes the view object caches contain pointers to the same entity object row. This means that if a row is updated through one view, then the change is automatically seen in the other view. Extending the filing cabinet analogy used to explain entity objects, it s like having two folders marked US Customers and High Earning Global Customers, each folder containing a separate sheet of paper per record. On each sheet of paper is information detailing in which filing cabinet drawer the actual data is held. As well as defining an application-specific view of data, view objects are linked together by view links to define relationships between those views. For example, you may decide your application will never expose a list of all orders, but rather will expose only the orders for a specific customer. Thus, the combination of view objects, linked together by view links, becomes the building blocks of your application data model. And this is an important fact to bear in mind when building your view objects: it is this data model of view object instances that will be exposed through an application module to the UI developer when constructing the UI pages. TIp When designing your view objects, you might find it useful to think about your UI design: What information do you want to display on your UI pages How do you want those pages to flow Thinking UI first can be a useful notion when building view objects.
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