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Now return to the class diagram file and open up the Nested Types node on the InventoryDataSet icon. Here you will see the strongly typed DataTable class named InventoryDataTable and a strongly typed DataRow class named InventoryRow. The InventoryDataTable class (which is the same type as the member variable of the strongly typed DataSet you examined) defines a set of properties that are based on the column names of the physical Inventory table (CarIDColumn, ColorColumn, MakeColumn, and PetNameColumn), as well as a custom indexer and a Count property to obtain the current number of records. More interestingly, this strongly typed DataTable class defines a set of methods that allow you to insert, locate, and delete rows within the table using strongly typed members (an attractive alternative to navigating the Rows and Columns indexers manually). For example, AddInventoryRow() lets you add a new record row to the table in memory, FindByCarID() lets you do a look up based on the primary key of the table, and RemoveInventoryRow() lets you remove a row from the strongly typed table (see Figure 22-21).

Figure 22-15. Trusted for delegation for Windows 2000 (functional level)

The strongly typed DataRow class, which is also nested in the strongly typed DataSet, extends the DataRow class and exposes properties that map directly to the schema of the Inventory table. Also, the data designer tool has created a method (IsPetNameNull()) that will perform a check on whether this column has a value (see Figure 22-22).

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It s important to keep in mind that both Figure 22-14 and Figure 22-15 show the same dialog box (the properties of the computer you want to configure through Active Directory Users and Computers). In the first case (Figure 22-14), Windows Server 2003 is configured to run the Active Directory domain at a Windows Server 2003 functional level; in the second case (Figure 22-15), the domain is configured for Windows 2000 functional level (which is the default configuration). With these settings you basically specify the capabilities of the tickets issued by the KDC (which is the domain controller). If tickets don t have these capabilities, delegation is not granted and not possible. After you have configured this setting, you don t need to perform any extra steps. Just configure IIS for integrated Windows authentication, and enable impersonation in your ASP.NET web application, as you will see in the next section. You can find more about configuring and troubleshooting delegation on the Microsoft website at http://www.microsoft.com/downloads/ details.aspx FamilyID=7dfeb015-6043-47db-8238-dc7af89c93f1&displaylang=en.

Strong typing for your disconnected types is a solid benefit of using the Data Source Configuration Wizard, given that creating these classes by hand would be tedious (but entirely possible). This same wizard was kind enough to generate a custom data adapter object that can fill and update the InventoryDataSet and InventoryDataTable objects in a strongly typed manner. Locate the InventoryTableAdapter on the visual class designer and examine the generated members in Figure 22-23.

To round off this Hibernate introduction, let me use a UML diagram, shown in Figure 1-2, to illustrate a simple physical relational database mapped to OO classes..

The autogenerated InventoryTableAdapter type maintains a collection of SqlCommand objects (which you can access using the CommandCollection property), each of which has a fully populated set of SqlParameter objects. Furthermore, this custom data adapter provides a set of properties to extract the underlying connection, transaction, and data adapter objects, as well as a property to obtain an array representing each command type.

Caution We suggest not using impersonation or delegation if it s not really necessary. If you use impersonation or delegation, this includes flowing the original client user s identity from the front-end to the backend. On the backend, all the ACLs and operating system security-related authorization settings must be configured properly for every single user. This configuration gets harder and harder with an increasing number of users. A simple configuration mistake can lead to either an application that doesn t work or a (probably huge) security leak. And think about the additional security configurations necessary! Instead, you should group users to roles and perform any security configuration based on roles or groups. You will learn more about roles and groups in 23.

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