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In this case, the Customer class was generated by the SQLMetal utility, as was the Northwind class, for that matter After retrieving the customer, we updated one of the Customer object s properties, ContactName, and called the SubmitChanges method to persist the modified contact name to the database Notice that we wrapped the call to the SubmitChanges method in a try/catch block and specifically caught the ChangeConflictException exception This is for handling concurrency conflicts, which we will cover in detail in 17 Before you can run this example or any of the others in this chapter, you will need to create entity classes for the Northwind database Please read the section in this chapter titled Prerequisites for Running the Examples to guide you through creating the necessary entity classes LINQ to SQL is a complex subject, and providing any example requires involving many LINQ to SQL elements.

This is the user account used to login to the specified database when connecting to create the entity classes. This is the password used for the specified user account to login to the specified database when connecting to create the entity classes. This is a connection string to the database. You may use this instead of specifying the /server, /database, /user, and /password options.

To recap from the previous chapter, a custom action has a corresponding tag handler class, which is responsible for creating the UIComponent and transferring each declarative JSP tag attribute to the UIComponent instance. The design of the deck component is a renderer-specific parent component (ProShowOneDeck) that manages which child to display to the user and a

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In the first example at the beginning of this chapter, we are using a derived DataContext class, which is the Northwind class; an entity class, which is the Customer class; concurrency conflict detection and resolution; and database updates via the SubmitChanges method We can t possibly explain all these concepts simultaneously So, we need to give you some background on each of these components before we begin so that you will have a basic understanding of the foundation of LINQ to SQL Rest assured that we will cover each of these concepts in agonizing detail later in the subsequent LINQ to SQL chapters..

Table 13-1. SQLMetal Command Line Options (Continued)

The DataContext class establishes a connection to a database. It also provides several services that provide identity tracking, change tracking, and change processing. We ll cover each of these services in more detail in 16. For now, just know that it is the DataContext class that is connecting us to the database, monitoring what we have changed, and updating the database when we call its SubmitChanges method. It is typical with LINQ to SQL to use a class derived from the DataContext class. The name of the derived class usually is the same as the database to which it is mapped. We will often refer to that derived class in the LINQ to SQL chapters as [Your]DataContext, because its name is dependent on the database for which it is being created. In our examples, our derived DataContext class will be named Northwind. We use the SqlMetal tool included with Visual Studio 2010, which automatically generates mapping classes from a SQL Server database. SQLMetal names the generated, derived DataContext class after the database for which it is generated.

behavioral child component (UIShowItem) that has a header facet and contains any child components that application developers might have added. You also have the custom event (ShowEvent) with the associated listener interface (ShowListener). Figure 3-12 shows the three tag handlers.

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This derived DataContext class, [Your]DataContext, will typically have a Table<T> public property for each database table you have mapped in the database, where T is the type of the entity class that is instantiated for each retrieved record from that particular database table. The data type Table<T> is a specialized collection. For example, since there is a Customers table in the Northwind database, our Northwind class derived from the DataContext class will have a Table<Customer> named Customers. This means that we can access the records in the Customersdatabase table by directly accessing the Customers property of type Table<Customer> in our Northwind class. You can see an example of this in the first example in this chapter, Listing 12-1, where we coded db.Customers. That code is querying the records in the Customerstable of the Northwind database.

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