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At this point the only thing you know about the listener, defined by the application developer, is a String representing the fully qualified class name com.apress.projsf.ch3. application.MyShowListener. To be able to use this class, you first need to load the class defined in the string from the class path and then create and return a new instance of this class. In the createShowListener() method, you first need to get hold of the ClassLoader for this thread to be able to load the class from the class path, as shown in Code Sample 3-37. You then invoke the loadClass() method on the ClassLoader instance, passing the fully qualified class name defined in the String object. When you have the class, you can create a new instance of it by invoking the newInstance() method. You then cast this new instance to ShowListener before you return the listener instance. Code Sample 3-37. The createShowListener Method protected ShowListener createShowListener( String className) throws JspException { try { ClassLoader loader = Thread.currentThread().getContextClassLoader(); Class clazz = loader.loadClass(className); return ((ShowListener) clazz.newInstance()); } catch (Exception e) { throw new JspException(e); } } }

The first step to use the designer is to create a LINQ to SQL Classes file by right-clicking your project and selecting Add/New Item from the pop-up context menu. After doing that, the Add New Item dialog box will open. Select the LINQ to SQL Classes template from the list of installed templates. Edit the name to whatever you choose. The name of the database you will be modeling is typically a good choice for the LINQ to SQL Classes file name. The extension for a LINQ to SQL Classes file is .dbml. For this example, I will use Northwind.dbml for the name of the file.

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nwind.Northwind db = new nwind.Northwind(@"Data Source=.\SQLEXPRESS;Initial Catalog=Northwind"); db.Log = Console.Out; var custs = from c in db.Customers where c.Region == "WA" select new { Id = c.CustomerID, Name = c.ContactName }; foreach (var cust in custs) { Console.WriteLine("{0} - {1}", cust.Id, cust.Name); } Since we will be demonstrating both SQLMetal- and Object Relational Designer generated entity classes in this chapter, there will be two Customer classes that exist for the examples. As we mentioned earlier, we did not include a using directive for the examples so that the entity classes such as Customer would not be ambiguous. Therefore, we have to specify the namespace nwind for the Northwind class in Listing 13-1, since we are using the SQLMetal-generated entity class code for this example. As you can see, in Listing 13-1, we simply assign Console.Out to our Northwind DataContext object s Log property. Here are the results of Listing 13-1:

SELECT [t0].[CustomerID], [t0].[ContactName] FROM [dbo].[Customers] AS [t0] WHERE [t0].[Region] = @p0 -- @p0: Input String (Size = 2; Prec = 0; Scale = 0) [WA] -- Context: SqlProvider(Sql2005) Model: AttributedMetaModel Build: 3.5.20706.1 LAZYK - John Steel TRAIH - Helvetius Nagy WHITC - Karl Jablonski

If you create a file named Northwind.dbml in a project you have already created for the samples in this book, be careful that you don t end up with a name collision between the designer-generated code and your already existing code.

This allows us to see exactly what the generated SQL query looks like. Notice that the generated SQL statement is not just formatting a string; it is using parameters. So by using LINQ to SQL, we automatically get protection from SQL injection attacks.

s Note For more information about the classes java.lang.Thread and java.lang.ClassLoader,

Click the Add button once you have named the file. You will then be presented with a blank window. This is your designer canvas. Figure 13-1 shows the designer canvas. If you click the canvas and examine the Properties window, you will see a property named Name. The value of the Name property will be the name of the generated DataContext class. Because I named my LINQ to SQL Classes file Northwind.dbml, the Name property s value will default to NorthwindDataContext, which is just fine. You could change it if you wanted to, but for this discussion, I will leave it as it is. If you examine the Solution Explorer, you will see that you now have a file nested under Northwind.dbml named Northwind.designer.cs. If you open this file, you will see that it contains very little code at this point. Basically, it will contain the constructors for the new DataContext class it is deriving for you named NorthwindDataContext.

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