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View Objects: A Window to Your Data
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TIp As you go through this chapter, it is useful to go back to the query and see how it changes as you edit your view object. This helps give you an insight into how JDeveloper is implementing the features you are building into the view object.
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When testing your business service in the ADF Business Component Browser, you might have noticed that the customer data wasn t being retrieved in any discernable order. For this application, you would like to order your customers by their customer Id. Given that you know the view object is shaping the view of your application data, and the fact that there is a select statement behind the scenes, it should not be surprising to learn that the view object allows you to set an order by clause. In the view object editor for CustomersView, select the Query tab and click the edit pencil icon to display the Edit Query dialog, as shown in Figure 6-3. Set Order By to CUSTOMER_ID, noting that as you type, the select statement is automatically updated. Test this change in the ADF Business Component Browser to ensure that your customer information is being displayed in the correct order. You can also set an appropriate order for some of the other view objects.
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FIGUre 6-3. Editing the query clause for CustomersView
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Having defined a sort order for your customer data, what happens if you want to filter that data For example, if this application is used only in your U.S. office, then maybe it makes sense to only show U.S. customers. Figure 6-3 shows that you can also define a where clause. Assuming NlsTerritory is the attribute on which you test whether a customer is a U.S. customer, set Where to NLS_TERRITORY='AMERICA' and test it in the ADF Business Component Browser. This will bring back only customers who are based in the United States, ordered by their ID.
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You should now start to see how the view object could be used to shape your data into an application-specific view. However, what if you require a little more flexibility in how you shape this data For example, in the preceding section, a where clause was used to filter customers. What if your application is being deployed globally and some users will be dealing with the Italian customer base Do you create a view object for U.S. customers and one for Italian customers Well, you could, but that would be overkill. Instead, you can use bind variables to introduce parameters into the view object select statement. Separate instances of this parameterized view object can then be added to the application module, with the bind variable specified for each instance. Alternatively, a single instance of the view object could be added to the application module and the value of the bind variables could be set at runtime based on some programmatic factor, such as detecting the country of the logged-in user or selecting a value in a search form.
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Creating a Bind Variable for a where Clause From the Edit Query dialog, select Bind Variables and click New to create a new bind variable. Set Name to Territory_bind and accept the other default values. You can optionally set Value, which defines the default value for the bind variable, and also set control hints on the Control Hints tab if you wish to display the bind variable to the end user. Click OK.
6:
View Objects: A Window to Your Data
Now in your query set Where to NLS_TERRITORY LIKE :Territory_bind ||'%' and click OK. You can now test through the ADF Business Component Browser, and when you select CustomersView1 you will be prompted for a value for the bind variable. Try entering ITALY or INDIA to automatically filter the data. Bind variables are an important feature of view objects and demonstrate how you can dynamically define parameters for a view object s query. However, for the purposes of this application, you are going to be working with all possible customers, so it s not required for this application.
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