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[ Web Form Designer Generated Code] Private Sub Page_Load(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles MyBase.Load MyBase.HeaderIconImageUrl = "~/Images/securekeys.gif" MyBase.HeaderMessage = "Login Page" End Sub Private Sub btnLogin_ServerClick(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles btnLogin.ServerClick Dim con As New SqlConnection( _ "data source=.;initial catalog=FriendsData;" + _ "user id=apress;pwd=apress") Dim cmd As New SqlCommand( _ "SELECT UserID FROM [User] " + _ "WHERE Login=@Login and Password=@Pwd", con) ' Add parameters for the values provided cmd.Parameters.Add("@Login", txtLogin.Value) cmd.Parameters.Add("@Pwd", txtPwd.Value) con.Open() Dim id As String = Nothing Try ' Retrieve the UserID id = CType(cmd.ExecuteScalar(), String) Finally con.Close() End Try If Not id Is Nothing Then ' Set the user as authenticated and send him to the ' page originally requested FormsAuthentication.RedirectFromLoginPage(id, False) Else pnlError.Visible = True lblError.Text = "Invalid user name or password!" End If End Sub End Class 6. Save all your changes, and then run the application with Default.aspx as the start page. You should find that you re taken to the Login page automatically, as shown in Figure 4-5.

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It seems that two things will trigger this reoptimization: first, if any of the predicates involves a range scan, and second, even on a simple equality, if there is histogram on a column that appears in a predicate, the query will be reoptimized (See script similarsql in the online code suite for an example showing this) When this happens, the resources needed for optimization increase, as does the contention, because Oracle rewrites the query with bind variables, decides it should not be sharable, and inserts it into the library cache as a new child cursor in v$sql (where lots of copies of the same, substituted text will presumably be accumulating under the same latch).

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The hyperlink element can have a tooltip, which is controlled by the <hyperlinkTooltipExpression> tag. The type of the expression should be java.lang.String. The tooltip expression will be evaluated along with the hyperlink and the result will be saved in the generated document.

The moral of this story is that if you really think you have to set cursor_sharing=similar, make sure you don t create more histograms than you absolutely need to, or you may introduce more performance problems than you solve (In fact, you should always avoid creating histograms that you don t really need it s just that this setting for cursor_sharing really exacerbates the problem).

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Figure 4-5. The Login page appears automatically after your changes. How It Works From now on, all of the web forms that you add to this project will inherit from the FriendsBase class that you created in 3. You ll also always use the two fields provided by the base class to set the text and the image for the current page. On this occasion, that was done in the Page_Load() handler: Private Sub Page_Load(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles MyBase.Load MyBase.HeaderIconImageUrl = "~/Images/securekeys.gif" MyBase.HeaderMessage = "Login Page" End Sub The settings you ve applied to the Web.config file will redirect the browser to the Login.aspx page when you start the project. After entering values for the user name and password and clicking the button, the code in btnLogin_ServerClick() is executed. The first step performed there is to create a new SqlConnection object, using the same connection string as last time. After the object is created, it remains closed until you explicitly call the Open() method later on: Dim con As New SqlConnection( _ "data source=.initial catalog=FriendsData" + _ "user id=sapwd=apress") Next, construct a SqlCommand object whose SQL statement contains parameter references: Dim cmd As New SqlCommand( _ "SELECT UserID FROM [User] " + _ "WHERE Login=@Login and Password=@Pwd", con)

There is a little trap waiting for you if you create stored outlines or make use of explain plan while cursor_sharing is set to force or similar. When you explain plan for {sql statement}, or create outline for {sql statement}, Oracle does not replace constants with bind variables. Instead it creates an execution plan based on the actual values supplied.

And then append the parameters and their values to it: cmdParametersAdd("@Login", txtLoginValue) cmdParametersAdd("@Pwd", txtPwdValue ) In the next line, after opening the connection, you use the ExecuteScalar() method of the SqlCommand object to retrieve the single value you re selecting (If the SQL expression returned more than one row and/or field, only the first field of the first row would be passed back to your code by this method) Because you built the SQL statement to return the user ID, that s what you ll get, after casting it to a string: Try ' Retrieve the UserID id = CType(cmdExecuteScalar(), String) Finally conClose() End Try Next, check whether a valid user ID was returned If it wasn t, either the user name or the password must have been incorrect, so you show an error message.

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