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The ProfileModule that saves profile information isn t able to detect changes in complex data types (anything other than strings, simple numeric types, Boolean values, and so on). This means if your profile includes complex data types, the ProfileModule saves the profile information at the end of every request that accesses the Profile object. This behavior obviously adds unnecessary overhead. To optimize performance when working with complex types, you have several choices. One option is to set the corresponding profile property to be read-only (if you know it never changes). Another approach is to disable the autosave behavior completely by adding the automaticSaveEnabled attribute on the <profile> element and setting it to False, as shown here: <profile defaultProvider="SqlProvider" automaticSaveEnabled="False"> ... </profile> If you choose this approach, it s up to you to call Profile.Save() to explicitly commit changes. Generally, this approach is the most convenient, because it s easy to spot the places in your code where you modify the profile. Just add the Profile.Save() call at the end: Profile.Address = New Address(txtName.Text, txtStreet.Text, txtCity.Text, txtZip.Text, txtState.Text, txtCountry.Text) Profile.Save() One final option is to handle the ProfileModule.ProfileAutoSaving event in the global.asax file. At this point, you can check to see if a save is really necessary and cancel the save if it isn t. With this technique, the obvious problem is determining whether the automatic save should be cancelled. You could store the original profile data in memory and then compare these objects with the current objects when the ProfileAutoSaving event fires. However, this approach would be

Represents a given element within an XML document, including the root element. Represents the name of an XML element or XML attribute. Represents an XML namespace. Represents the abstract concept of a node (element, comment, document type, processing instruction, or text node) in the XML tree. Represents an XML processing instruction. Represents elements in an XML tree that supports deferred streaming output.

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public String getSurname() { return surname; } public void setSurname(String surname) { this.surname = surname; } } Within the @Column annotation ,you can define different parameters, such as name, unique, nullable, and so forth. If you don't specify any name, Hibernate will by default use the name of the variable. Our unique identifier strategy is to make the system generate an incremental number. To do that we use the @GeneratedValue annotation with the IDENTITY strategy, which means it will generate an incremental number. @Id @GeneratedValue(strategy = IDENTITY) @Column(name="user_id") private int userId; Before continuing, we need to set up our project to synchronize the changes made to our Java entities within the database schema by adding the following Hibernate-Maven plug-in to our POM file after the </dependencies> tag. <build> <defaultGoal>install</defaultGoal> <plugins> <plugin> <groupId>org.codehaus.mojo</groupId> <artifactId>hibernate3-maven-plugin</artifactId> <version>2.0-alpha-2</version> <configuration> <components> <component> <name>hbm2ddl</name> <implementation> annotationconfiguration </implementation> </component> </components> <componentProperties> <drop>false</drop> <update>false</update> <jdk5>true</jdk5> <propertyfile>

awkward and slow. A better option is to make the page keep track of whether a change has been made. If a change has been made, your code can then set a flag to indicate that the update should go ahead. For example, consider the test page shown in Figure 24-3 that allows you to retrieve and modify address information.

In addition to the X* classes, System.Xml.Linq defines a class named Extensions, which (of course) defines a set of extension methods which typically extend IEnumerable<T>, where T is some descendent of XNode or XContainer. Table 24-2 documents some of the important extension methods to be aware of (as you will see, these are very useful when you wish to work with LINQ queries). Table 24-2. Select Members of the LINQ to XML Extensions Class

All the text boxes on this page use the same event handler for their TextChanged event. This event handler indicates that a change has been made by storing a Boolean value in the context for the current request: Protected Sub txt_TextChanged(ByVal sender As Object, ByVal e As EventArgs) Context.Items("AddressDirtyFlag") = True End Sub Keep in mind that a value stored in this way lasts only for the duration of the current request. In this example, that s not a problem because the user has only two options after making a change rejecting the change (by clicking Get) or applying the change (by clicking Save). However, if you create a page where the user can make changes over several steps and then apply them later, you would need to go to more work to maintain the flag. Storing the flag in other locations such as session state or view state won t work, because they aren t available when the AutoSaving event fires in the global.asax file. Finally, here s the event handler you need that allows the autosave to carry on only if a change has been made: Private Sub Profile_ProfileAutoSaving(ByVal sender As Object, ByVal e As ProfileAutoSaveEventArgs) If (e.Context.Items("AddressDirtyFlag") Is Nothing) OrElse (CBool(e.Context.Items("AddressDirtyFlag")) = False) Then e.ContinueWithProfileAutoSave = False End If End Sub

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