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C a utio n If you see in your results that the name associated with customer LAZYK is Ned Plimpton instead of John Steel as we show in the preceding example, you probably ran Listing 13-1 without setting the data back as we recommended.

In later chapters, we will demonstrate how to use this logging feature to detect and resolve potential performance issues.

The next step is to add a connection to the appropriate database server containing the Northwind database in the Server Explorer window if one does not already exist.

please refer to the J2SE 1.4 API specification (http://java.sun.com/j2se/1.4.2/docs/api/

You can use the DataContext object s GetChangeSet method to obtain all entity objects containing changes that need to be persisted to the database when the SubmitChanges method is called. This is useful for logging and debugging purposes. This method is also fully documented in 16.

If you do not see the Server Explorer window, select Server Explorer from the Visual Studio View menu.

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Without a doubt, one of the bigger hassles of using any ORM tool is going to be managing changes to the database. If you keep all your business class logic and LINQ to SQL logic in the same modules, you may be creating a maintenance headache for yourself down the road once the database changes. Consider leveraging partial classes by adding your business logic to a separate module than the generated entity class modules. By using partial classes to keep your LINQ to SQL database attributes separate from your business logic, you will minimize the need to add code back to any generated entity class code. Alternatively, you could have your business classes and your LINQ to SQL entity mapping decoupled by using an external XML mapping file. This is an XML file that maps business objects to the database without relying on LINQ to SQL attributes. You can read more about mapping files in the XML External Mapping File Schema section in 15 and in the DataContext constructor section of 16.

Partial methods allow you to hook into certain events that occur in entity classes. The beauty of partial methods is that if you do not take advantage of them by implementing the body of a partial method, there is no overhead, and no code is emitted by the compiler to call them. We discuss how partial methods are used in entity classes in the Calling the Appropriate Partial Methods section of 15.

To add a connection to the database, right-click the Data Connections node in the Server Explorer window, and choose the Add Connection menu item to open the Add Connection dialog box, shown in Figure 13-2. The Data source entry field will default to Microsoft SQL Server (SqlClient), which is what we want. Configure the appropriate settings for your Northwind database in the Add Connection dialog box. You may want to click the Test Connection button to make sure you have properly configured the connection.

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Just as there are some tips we want to make you aware of before you actually need them, there are some tools that can make your life easier. Again, we may be bringing these up before they make sense to you,

Figure 13-2. The Add Connection dialog box Once you have the connection properly configured, click the OK button. You should now have a node representing your Northwind database connection under the Data Connections node in the Server Explorer. You may now access the Northwind database in the designer. Before proceeding, make sure you are viewing the Northwind.dbml file in the Visual Studio editor.

but we want you to be aware of them and how they can facilitate and accelerate your adoption of LINQ to SQL.

The release() method (see Code Sample 3-37) is part of the Tag handler contract and as such is not a JSF-specific feature, but since the ShowListener tag handler class is directly extending the Tag handler subclass, TagSupport, it makes sense to discuss the release() method now. Code Sample 3-38. Release Stored State /** * Releases the internal state used by the tag. */ public void release() { _type = null; }

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