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This mapping can occur directly in class source files by decorating classes with the appropriate attributes, or it can be specified with an external XML mapping file. By using an external XML mapping file, the LINQ-to-SQL-specific bits can be kept external to the source code. This could be very handy if you don t have source code or want to keep the code separated from LINQ to SQL. For the majority of examples in the LINQ to SQL chapters, I will be using entity classes that have been generated by the SQLMetal command-line tool. SQLMetal generates the entity classes with the LINQ to SQL mapping bits right in the source module it generates. These mapping bits are in the form of attributes and attribute properties. You will be able to detect the existence of entity classes in my examples when you see classes or objects that have the singular form of a Northwind database table name. For example, in Listing 12-1, I use a class named Customer. Because Customer is the singular form of Customers and the Northwind database has a table named Customers, this is your clue that the Customer class is an entity class for the Northwind database s Customers table. The SQLMetal command- line tool has an option called /pluralize that causes the entity classes to be named in the singular form of the database table name. Had I not specified the /pluralize option when generating my entity classes, my entity class would be named Customers, as opposed to Customer, because the name of the table is Customers. I mention this in case you get confused reading other writings about LINQ to SQL. Depending on how the author ran the SQLMetal tool and what options were specified, the entity class names may be plural or singular.

<BookParticipants> <BookParticipant> <FirstName>Joe</FirstName> <LastName>Rattz</LastName> </BookParticipant> </BookParticipants> Like magic, the attributes are gone.

N ote In addition to using the XAttribute.Value property to update attributes, be sure to check out the XElement.SetAttributeValue() section later in the chapter.

An association is the term used to designate a primary key to foreign key relationship between two entity classes. In a one-to-many relationship, the result of an association is that the parent class, the class containing the primary key, contains a collection of the child classes, the classes having the

s For more information about JavaScript and the DOM, please visit http://www.w3.org/DOM/. Tip Another good source if you are new to JavaScript is http://developer.mozilla.org/en/docs/ Main_Page.

Updating the value of an attribute is easily accomplished using its Value property. Listing 7-83 is an example.

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foreign key. That collection is stored in a private member variable of type EntitySet<T>, where T will be the type of the child entity class. For example, in the Customer entity class generated by the SQLMetal command-line tool for the Northwind database, there is a private member of type EntitySet<Order> named _Orders that contains all of the Order objects for a specific Customer object: private EntitySet<Order> _Orders; SQLMetal also generated a public property named Orders to be used for accessing the private _Orders collection. On the other end of the relationship, the child, which is the class containing the foreign key, contains a reference to the parent class, since that is a many-to-one relationship. That reference is stored in a private member variable of type EntityRef<T>, where T is the type of the parent class. In the generated Northwind entity classes, the Order entity class contains a private member variable of type EntityRef<Customer> named _Customer: private EntityRef<Customer> _Customer; Again, the SQLMetal tool also generated a public property named Customer to provide access to the parent reference. The association, primary and foreign keys, as well as the direction of the relationship are all defined by attributes and attribute properties in the generated entity classes source module. The benefit gained by the association is the ability to access a parent s child classes, and therefore database records, as easily as accessing a property of the parent class. Likewise, accessing a child s parent class is as easy as accessing a property of the child class.

// we will use this to store a reference to one of the elements in the XML tree. XElement firstParticipant; XDocument xDocument = new XDocument( new XElement("BookParticipants", firstParticipant = new XElement("BookParticipant", new XAttribute("type", "Author"), new XAttribute("experience", "first-time"), new XElement("FirstName", "Joe"), new XElement("LastName", "Rattz")))); Console.WriteLine(System.Environment.NewLine + "Before changing attribute's value:"); Console.WriteLine(xDocument); firstParticipant.Attribute("experience").Value = "beginner"; Console.WriteLine(System.Environment.NewLine + "After changing attribute's value:"); Console.WriteLine(xDocument);

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