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Now that you know how to create typed DataSets, let s look at a Web service and a Windows Forms client that use typed DataSets to send data back and forth over the Internet Listing 9-7 shows a Web method called SaveCustomerOrdersTypedDataSet which receives a DataSet, uses it to update the Customers and Orders tables, then returns the refreshed DataSet This method complements the GetCustomerOrdersTypedDataSet method in listing 9-4 Listing 9-7 A method to save changes to the database (VBWSBook\9\CustomerOrdersasmx)
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<WebMethod()> _ Public Function SaveCustomerOrdersTypedDataSet( _ ByVal ds As CustomerOrdersDataSet) _ As CustomerOrdersDataSet Dim Sql1 As String = "SELECT CustomerID, CompanyName FROM Customers" Dim Sql2 As String = "SELECT * FROM Orders"
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Dim ConnStr As String = _ ConfigurationSettingsAppSettingsGet("ConnStr") Dim cn As New SqlConnection(ConnStr) Try cnOpen() Dim da1 As New SqlDataAdapter(Sql1, cn) Dim da2 As New SqlDataAdapter(Sql2, cn)
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Dim cb1 As New SqlCommandBuilder(da1) Dim cb2 As New SqlCommandBuilder(da2) da1Update(ds, "Customers") da2Update(ds, "Orders") cnClose() Catch ex As Exception DebugWriteLine(exMessage) Throw New Exception(exMessage) Finally cnDispose() End Try Return ds End Function
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To update a database from a DataSet, you need to create a SqlDataAdapter (or an OleDbDataAdapter) for each database table that you want to update You then have to create Select, Update, Insert, and Delete commands for the adapter When there s a one-to-one correspondance between tables in your DataSet and database tables, you can create just the Select command then use a SqlCommandBuilder which builds the remaining commands for you After you ve created the data adapters, you call Update on each adapter passing it the DataSet and the name of the table to update In addition to updating the database table, the adapter will also refresh the DataSet with the current database table s content After updating both Customers and Orders tables, SaveCustomerOrdersTypedDataSet returns the refreshed DataSet This is not necessary unless clients need to display the current content of the database which is usually the case Listing 9-8 shows an example Windows Forms client code
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Listing 9-8 A client invoking GetCustomerOrdersTypedDataSet and SaveCustomerOrdersTypedDataSet (VBWSClientCode\9\frmRndTripvb)
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Public Class frmRndTrip Inherits SystemWindowsFormsForm Private _UseProxy As Boolean Private ds As vbwsserverCustomerOrdersDataSet Dim ws As vbwsserverCustomerOrders
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Private Sub frmRndTrip_Load(ByVal sender As SystemObject, _ ByVal e As SystemEventArgs) Handles MyBaseLoad ws = New vbwsserverCustomerOrders() SetProxy(ws) GetData() End Sub Private Sub btnRefresh_Click(ByVal sender As SystemObject, _ ByVal e As SystemEventArgs) Handles btnRefreshClick lblStatusText = "Refreshing " MeRefresh() GetData() lblStatusText = "Refresh completed successfully" End Sub Private Sub GetData() ds = wsGetCustomerOrdersTypedDataSet() dgOrdersDataSource = ds End Sub Private Sub btnSave_Click(ByVal sender As SystemObject, _ ByVal e As SystemEventArgs) Handles btnSaveClick lblStatusText = "Saving " MeRefresh() Dim newDS As New vbwsserverCustomerOrdersDataSet() newDS = wsSaveCustomerOrdersTypedDataSet(dsGetChanges()) dsMerge(newDS) lblStatusText = "Save completed successfully" End Sub End Class
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This Windows Forms client consists of a form with a data grid, a button for saving changes, and a button for refreshing the data The client has added a Web reference to the Customers Web service on VBWSServer As part of adding a Web reference, the generated proxy code includes a typed DataSet called CustomerOrdersDataSet which mirrors the one used by the service Listing 9-8 declares a member variable called ds of type CustomerOrdersDataSet (which belongs to the VBWSServer namespace) This variable is declared as a class member variable because it will be used to hold the data returned from the Web service and all updates made by the user When the form is loaded, the code in frmRndTrip_Load instantiates a Web service proxy and calls GetCustomerOrdersTypedDataSet to retrieve the DataSet It then binds the data grid called dgOrders to the returned DataSet The grid displays a hierarchy of customers and their orders as shown in figure 9-7 The user can then edit the data and click Save which executes btnSave_Click in listing 9-8 This procedure first calls dsGetChanges to get a new DataSet that contains changed rows It then calls the Web service s SaveCustomerOrdersTypedDataSet method passing it the changes DataSet and receiving a refreshed DataSet To display any new data in the returned DataSet, it calls dsMerge passing it the returned DataSet The code you write for sending and receiving DataSets on the Web service side is concise and straightforward Similarly, NET clients can leverage DataSets to write equally concise code You have to keep in mind that other clients, such as VB 6 and Java, would have to work with the DataSet as XML Using XML technologies such as the Document Object Model (DOM), XML Path (XPath), and Extensible Stylesheet Language Transformation, a non-NET client has a rich programming model that allows extensive manipulation of a DataSet represented as XML However, non-NET clients will require more code to manipulate the DataSet compared to NET clients In chapter 12 you will see a Java client that calls this Web service, manipulates the returned dataset then sends it back to the Web service for saving
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