Extended Feature s of Web Ser vice s in VS .NET

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Extended Feature s of Web Ser vice s
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Figure 73: The Visual Studio schema editor
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Figure 74: Adding a relationship to the Customers and Orders tables in the dataset
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data) instead of at (Customers and Orders data are not physically nested but are related by their primary and foreign keys) InfoPath is able to cascade update and delete operations to nested records only when the parent table changes Unfortunately, the same features are not available when the data is at InfoPath will instead show an error dialog if you attempt cascading
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7: Extended Feature s of Data Conne ctions
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Cascading Updates and Deletes
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Cascading occurs when a parent and child have a relationship and the dataset is configured to cascade changes A relationship between tables is defined by a primary key on the parent table and a foreign key on the child tables A change in the parent primary key, with cascading updates enabled, would also update all children foreign keys Likewise, a cascading delete would remove all children table rows when the associated parent row is purged
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We re nished using the Visual Studio Designer to set up our ADONET components Let s hop back into the code in Servicecs to expose our dataset from a Web service method You will notice a large private method called InitializeComponent, which contains much of the auto-generated wizard code The code we are about to add to expose the dataset (shown in Listing 71) can be added anywhere, but it might be easiest to add it immediately above the InitializeComponent method (which is below where we left off writing the SaveItems method)
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Listing 71: Web Service Code to Return a DataSet
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[WebMethod] public customersOrderDS GetDataSet() { customersDAFill (customersOrdersDS1); ordersDAFill (customersOrdersDS1); return customersOrdersDS1; }
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We re almost nished Before we can use this Web service, the InitializeComponent method call must be uncommented (Visual Studio creates the project with it commented by default) If you fail to uncomment this method call, the code generated by the wizard to initialize the objects we created in the Visual Studio Designer isn t executed The
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Se condar y Data Source Binding InitializeComponent call is at the top of the source code and is com-
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mented out with a double forward slash Simply remove the two forward slashes and hit F5 to run Click on the GetDataSet link and run the method by using the Invoke button Since the process is similar to the Web service we used in the previous chapter, we ll leave it as an exercise for you to create a query Web service data connection to receive the Customers and Orders dataset
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Secondary Data Source Binding
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For each of the data connection examples in 6, we simply inserted controls from secondary data sources while designing our forms and saw them populated with data when previewing Until now, our intentional focus has been on each of the data connections themselves But we haven t yet explored secondary data source bound controls and how they differ from controls bound to the main data source To effectively use secondary data sources and their associated connections, it is important for us to account for these differences when designing, as well as editing, our forms
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Forms Services
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Secondary data source binding works similarly in a browser form as in InfoPath
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Designing the Form Template Let s go back for a moment to our XML le data connection example from the previous chapter and call out behaviors speci c to secondary data sources Start by designing the form and bringing up the Bulleted List Properties dialog for the Bulleted List that is bound to the secondary data source (Figure 75) The rst thing you will notice is that almost everything in the dialog, at least on the Data tab, is disabled! This is because these settings do not make sense for controls bound to secondary data sources The node name and data type (the latter isn t displayed in the Bulleted List Properties dialog) are predetermined by the external data source A default value
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