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adUser.SelectCommand.Parameters.Add("@ID", userID) ' Initialize the dataset and fill it with data dsUser = New DataSet adUser.Fill(dsUser, "User") ' Finally, bind all the controls on the page Me.DataBind() End Sub 9. The next method, GetPending(), will return the value that s used in the lblPending label to show the number of pending requests for the current user: Protected Function GetPending() As String ' Create the connection and command to execute Dim cnFriends As SqlConnection = New SqlConnection ( _ ConfigurationSettings.AppSettings("cnFriends.ConnectionString")) Dim cmd As SqlCommand = New SqlCommand ( _ "SELECT COUNT(*) FROM Contact " _ "WHERE IsApproved=0 AND DestinationID=@ID", cnFriends) cmd.Parameters.Add("@ID", Page.User.Identity.Name) cnFriends.Open() Try Return cmd.ExecuteScalar().ToString() Finally cnFriends.Close() End Try End Function 10. The last piece of code that you need to add here is the handler for the Authorize button. This will just perform an update of the IsApproved flag. Double-click the button and add the following code to the event handler: Private Sub btnAuthorize_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles btnAuthorize.Click ' Create the connection and command to execute Dim cnFriends As New SqlConnection( _ ConfigurationSettings.AppSettings("cnFriends.ConnectionString")) Dim cmd As New SqlCommand( _ "UPDATE Contact SET IsApproved=1 " + _ " WHERE RequestID=@RequestID AND DestinationID=@DestinationID", _ cnFriends) cmd.Parameters.Add("@RequestID", Request.QueryString("RequestID")) cmd.Parameters.Add("@DestinationID", Page.User.Identity.Name) cnFriends.Open() Try cmd.ExecuteNonQuery()

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Finally cnFriends.Close() End Try Response.Redirect("News.aspx") End Sub 11. Finally, save and compile the project. Open a browser window, and point it to the newly created page with the following parameter appended to the URL: RequestID=1A1CF6BD-9EEE-4b7d-9AB1-BEE3C3365DC9. After you log in to the application (again, with apress as the user name and password), you should see the page shown in Figure 5-3.

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Generates a large set of data with a normal distribution Demonstration of effects of cursor_sharing = similar Demonstrates that distributed queries ignore histograms Generates a frequency histogram example Some examples of the cardinality you get with frequency histogram Example of generating a frequency histogram Examples of the effects of faked statistics on histograms Script to modify statistics directly on the data dictionary Some examples of the cardinality you get with height balanced histograms Further example of cardinality with height balanced histograms Example of how histograms can help with incorrect data types Example of how histograms can help with extreme default values Sets the standardized test environment for SQL*Plus

How It Works The code in Page_Load() starts by checking for the existence of the RequestID parameter, and then creates a connection and a data adapter to perform the query. As you learned earlier in this chapter, you are no longer hard-coding the connection string. Instead, you are using the value stored in the configuration file: Dim cnFriends As New SqlConnection( _ ConfigurationSettings.AppSettings("cnFriends.ConnectionString"))

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hen I started writing this chapter, I thought it would be much shorter than the equivalent chapter on B-tree indexes ( 4) for two reasons First, bitmap indexes are actually hidden inside B-tree structures, so most of the groundwork for the calculation is in the other chapter (so you probably ought to read that chapter before you read this one) Second, bitmap indexes are much less subtle (I thought) than B-tree indexes, so there are fewer complications to consider However, as I started writing, I realized that my casual assumption was wrong Strategically, you use bitmap indexes very differently from B-tree indexes, so although there isn t a lot of new information to worry about when you consider just one bitmap index, you ve missed the point of bitmaps if you stop at one.

You are using the adapter SelectCommand property to assign the value to the parameter, as explained in the previous chapter: Dim adUser As New SqlDataAdapter( _ "SELECT * FROM [User] WHERE UserID=@ID", cnFriends) adUserSelectCommandParametersAdd("@ID", userID) After you have the objects configured, you create and fill the dataset that you defined at the class level as a protected variable: dsUser = new DataSet() adUserFill(dsUser, "User") Now, instead of manually assigning each property to the corresponding value in the dataset, you let the data-binding mechanism do its work and evaluate the expressions used in the page s HTML source You do this by explicitly calling DataBind() at the page level, so that every control on the page is evaluated: Me.

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