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To add such a mechanism to the service, you will modify the query sent to the database to include a check for the PlaceID before issuing the count of attendees If the PlaceID is not found in the Place table, it will return -1 Try It Out: Handle Web Service Errors To handle web service errors, you ll need to update both the web service and the consumer application The service needs to throw exceptions when an error occurs, and the consumer needs to trap them 1 Open the Partnersasmx code-behind file, locate the InitializeComponent method, and change the line that sets the cmAttendeesCountCommandText property to match the following: Private Sub InitializeComponent() ..etc.. ' 'cmAttendeesCount ' MecmAttendeesCount.

Because the underlying database implements ternary logic, testing for null values requires some care. Remember that null = null doesn t evaluate to true in the database, but to null. All comparisons that use the null operator in fact evaluate to null. Both HQL and the Criteria API provide an SQL-style is null operator:

Figure 11 23. Activity search 4. Select your search criteria for the activity, and click Set Alert.

CommandText = _ "IF EXISTS(SELECT PlaceID FROM Place WHERE PlaceID = @PlaceID)" & _ " SELECT COUNT(*) AS Attendees, @PlaceID " & _ " FROM (SELECT UserID" & _ " FROM TimeLapse" & _ " WHERE PlaceID = @PlaceID" & _ " GROUP BY UserID) Users" & _ "ELSE" & _ " SELECT -1" MecmAttendeesCountConnection = MecnFriends ..etc.. End Sub.

This query returns all users with no email address. The same semantic is available in the Criteria API:

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Note It might be a good idea to execute the query first to provide a sanity check on the query results. You can

You can t set the property to this value through the Properties browser or the Query Builder because the designer does not support IF statements (and many other valid SQL statements). Therefore, it will fail to set it. Once you set it this way, however, it will be properly reflected in both and preserved when you make changes to other properties. 2. Import the following namespace at the top of the code-behind class: Imports System.Web.Services.Protocols 3. Go to the GetAttendees() method and modify the code as follows: <WebMethod()> Public Function GetAttendees(ByVal placeId As String) As Integer cnFriends.Open() Try ' Set the place to filter by cmAttendeesCount.Parameters("@PlaceID").Value = placeId Dim count As Integer = CType(cmAttendeesCount.ExecuteScalar(), Integer) If count = -1 Then Throw New SoapException("Invalid Place identifier!", _ SoapException.ClientFaultCode, Context.Request.Url.AbsoluteUri) End If Return count Finally cnFriends.Close() End Try End Function Now, whenever the user passes in a place ID that doesn t exist, the application will throw a SoapException, which inherits from the standard Exception class. 4. Now that you ve altered this method so that it specifically throws exceptions, you must update your consumer application to ensure that it doesn t fall over when the exception is thrown. In other words, you need to make use of this exception, by catching it whenever it is thrown. To do this, drop a new Label control at the bottom of the Default.aspx page in the Acudei project and set the following properties for it: ID: lblError Visible: False EnableViewState: False ForeColor: Red 5. Locate the Page_Load() event handler in the code-behind code. Add the following try catch block: Private Sub Page_Load(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles MyBase.Load Dim friends = New Acudei.FriendsService.Partners

session.createCriteria(User.class) .add( Expression.isNull("email") ) .list();

The Alert Details screen will now display. At this screen, enter the details for your alert: Name: Enter the name of the alert. Message: Describe the message that should be displayed when the alert is fired. Priority: Assign relative priority. This would be used as a priority identifier within your solution. Alert Security: Allow this alert to be seen and used by other users.

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