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The HibernateDaoSupport provides the setter method to allow the injection of the sessionFactory bean, and this will automatically create the instance of the Hibernate template you can get through the HibernateTemplate method. If you want to use the HibernateTemplate without extending the HibernateDaoSupport, you should create a setter method in your class that creates an instance of the Hibernate template as in the code above. The Hibernate template offers a number of overloaded methods to query and update a persistent object and the database. But the Hibernate template is not the only way to query; indeed Hibernate also comes with the Hibernate Query Language (HQL).

The .NET Framework is divided into an almost painstaking collection of functional parts, with a staggering total of more than 7,000 types (the .NET term for classes, structures, interfaces, and other core programming ingredients). Before you can program any type of .NET application, you need a basic understanding of those parts and an understanding of why things are organized the way they are. The massive collection of functionality that the .NET Framework provides is organized in a way that traditional Windows programmers will see as a happy improvement. Each one of the thousands of data types in the .NET Framework is grouped into a logical, hierarchical container called a namespace. Different namespaces provide different features. Taken together, the .NET namespaces offer functionality for nearly every aspect of distributed development from message queuing to security. This massive toolkit is called the class library. Interestingly, the way you use the .NET Framework classes in ASP.NET is the same as the way you use them in any other type of .NET application (including a stand-alone Windows application, a Windows service, a command-line utility, and so on). In other words, .NET gives the same tools to web developers that it gives to rich client developers. If you ve programmed extensively with ASP.NET 1.x, you ll find that the same set of classes is available in ASP .NET 2.0. The difference is that ASP .NET 2.0 adds even more classes to the mix, many in entirely new namespaces for features such as configuration, health monitoring, and personalization.

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Figure 3-6. The class hierarchy of system types Notice that each of these types ultimately derive from System.Object, which defines a set of methods (e.g., ToString(), Equals(), GetHashCode()) common to all types in the .NET base class libraries (these methods are fully detailed in 6). Also note that many numerical data types derive from a class named System.ValueType. Descendents of ValueType are automatically allocated on the stack and therefore have a very predictable lifetime and are quite efficient. On the other hand, types that do not have System.ValueType in their inheritance chain (such as System.Type, System.String, System.Array, System.Exception, and System.Delegate) are not allocated on the stack, but on the garbage-collected heap.

One of the best resources for learning about new corners of the .NET Framework is the .NET Framework class library reference, which is part of the MSDN Help library reference. If you have Visual Studio 2005 installed, you can view the MSDN Help library by selecting Start Programs Microsoft Visual Studio 2005 Microsoft Visual Studio 2005 Documentation (the exact shortcut depends on your version of Visual Studio). Once you ve loaded the help, you can find class reference information grouped by namespace under the .NET Development .NET Framework SDK Class Library Reference node.

Without getting too hung up on the details of System.Object and System.ValueType , just understand that because a C# keyword (such as int) is simply shorthand notation for the corresponding system type (in this case, System.Int32), the following is perfectly legal syntax, given that System.Int32 (the C# int) eventually derives from System.Object and therefore can invoke any of its public members, as illustrated by this additional helper function: static void ObjectFunctionality() { Console.WriteLine("=> System.Object Functionality:"); // A C# int is really a shorthand for System.Int32. // which inherits the following members from System.Object. Console.WriteLine("12.GetHashCode() = {0}", 12.GetHashCode()); Console.WriteLine("12.Equals(23) = {0}", 12.Equals(23)); Console.WriteLine("12.ToString() = {0}", 12.ToString()); Console.WriteLine("12.GetType() = {0}", 12.GetType()); Console.WriteLine(); } If you were to call this method from within Main(), you would find the output shown in Figure 3-7.

One of the major reasons for performance degradation in ASP scripts is that all ASP web-page code uses interpreted scripting languages. This means that when your application is executed, a scripting host on the server machine needs to interpret your code and translate it to lower-level machine code, line by line. This process is notoriously slow.

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