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The biggest difference between the Spring DAO and the DAO as originally designed is that the Spring DAO is combined with the template method pattern, making it much easier to adapt to a particular framework. In the process of interacting with a database, some steps are invariable, for example, creating the connection and starting the transaction. The original DAO implements these steps over and over again in each method of the data access object. In contrast, the Spring DAO uses the template method pattern, in which a template class is used to provide support for a specific framework. For example, the HibernateTemplate provides support for working with Hibernate for such as methods like save, update and so on. Spring offers different DAO implementations to provide data access support for using JDBC, ORM, JNDI and LDAP. Table 5-1 summarizes the Spring data access DAO implementations.

As described earlier, you can force users to log on by modifying IIS virtual directory settings or by using authorization rules in the web.config file. The second approach is generally preferred. Not only does it give you more flexibility, but it also makes it easier to verify and modify authorization rules after the application is deployed to a production web server. 23 describes authorization in detail. For now, you ll consider only the simple technique of denying access to all unauthenticated users. To do this, you must use the <authorization> element of the web.config file to add a new authorization rule, as follows: <configuration> <system.web> <!-- Other settings omitted. -->

Source Code You can find the updated InventoryDALDisconnectedGUI project under the 22 subdirectory.

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<authorization> <deny users=" " /> </authorization> </system.web> </configuration> The question mark ( ) is a wildcard character that matches all anonymous users. By including this rule in your web.config file, you re specifying that anonymous users are not allowed. Every user must be authenticated using one of the configured Windows authentication protocols.

So far, all of this chapter s examples have operated on a single DataTable object. However, the power of the disconnected layer shines through when a DataSet object contains numerous interrelated DataTables. In this case, you can define any number of DataRelation objects in the DataSet s DataRelation collection to account for the interdependencies of the tables. The client tier can use these objects to navigate between the table data without incurring network roundtrips.

One of the nice things about Windows authentication is that no login page is required. When the user requests a page that requires authentication, the browser transmits the credentials to IIS. Your web application can then retrieve information directly from the User property of the web page. Here s an example that displays the currently authenticated user: If Request.IsAuthenticated Then ' Display generic identity information. lblInfo.Text = "<b>Name: </b>" & User.Identity.Name lblInfo.Text &= "<br/><b>Authenticated With: </b>" lblInfo.Text &= User.Identity.AuthenticationType End If This is the same code you can use to get information about the current identity when using forms authentication. However, you ll notice one slight difference. The user name is always in the form DomainName\UserName or ComputerName\UserName. Figure 22-7 shows an example with a user account named Matthew on the computer FARIAMAT.

Note Rather than updating AutoLotDAL.dll to account for the Customers and Orders tables, this example isolates all of the data access logic within a new Windows Forms project. However, intermixing UI and data logic in a production-level application is not recommended. The final examples of this chapter leverage various database design tools to decouple the UI logic from the data logic code.

As you ve learned in the past two chapters, the User property returns an IPrincipal object. When you use Windows authentication, this is an instance of the WindowsPrincipal class. The WindowsPrincipal class provides access to a WindowsIdentity object through the Identity property. The WindowsPrincipal class implements three overloads of IsInRole() that all check whether the user is in a specified Windows user group. The required IsInRole(string) overload is implemented so that it accepts the name of the user group to be checked. IsInRole(int) expects an integer RID (role identifier) that refers to a user group. Finally, an overload is provided that expects a member of the WindowsBuiltInRole enumeration, which provides a list of predefined Windows account types (such as Guest, Administrator, and so on). You can find the WindowsPrincipal, WindowsIdentity, and WindowsBuiltInRole types in the System.Security.Principal namespace.

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