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static private void ExecuteStatementInDb(string cmd) { string connection = @"Data Source=.\SQLEXPRESS;Initial Catalog=Northwind;Integrated Security=SSPI;"; System.Data.SqlClient.SqlConnection sqlConn = new System.Data.SqlClient.SqlConnection(connection); System.Data.SqlClient.SqlCommand sqlComm = new System.Data.SqlClient.SqlCommand(cmd); sqlComm.Connection = sqlConn; try { sqlConn.Open(); Console.WriteLine("Executing SQL statement against database with ADO.NET ..."); sqlComm.ExecuteNonQuery(); Console.WriteLine("Database updated."); } finally { // Close the connection. sqlComm.Connection.Close(); } } To call the ExecuteStatementInDb method, a string is passed containing a SQL command. A SqlConnection is created followed by a SqlCommand. The SqlConnection is assigned to the SqlCommand. The SqlConnection is then opened, and the SQL command is executed by calling the SqlCommand object s ExecuteNonQuery method. Finally, the SqlConnection is closed.

Notice that I used the Attribute method to obtain a reference to the experience attribute. The results are the following: Before changing attribute's value: <BookParticipants> <BookParticipant type="Author" experience="first-time"> <FirstName>Joe</FirstName> <LastName>Rattz</LastName> </BookParticipant> </BookParticipants> After changing attribute's value: <BookParticipants> <BookParticipant type="Author" experience="beginner"> <FirstName>Joe</FirstName> <LastName>Rattz</LastName> </BookParticipant> </BookParticipants> As you can see, the value of the experience attribute has changed from "first-time" to "beginner".

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In this chapter, we have introduced you to LINQ to SQL and some of its most basic terminology, such as DataContext objects, entity classes, associations, and concurrency conflict detection and resolution. We showed you how to generate entity classes and external mapping file for the extended Northwind database. These entity classes will be used extensively throughout the LINQ to SQL examples. We also provided a couple of common methods that many of the examples in the subsequent LINQ to SQL chapters will rely on. The next step is to arm you with some tips and show you how to use the necessary tools to leverage LINQ to SQL, and this is exactly what the next chapter is about.

XElement.SetAttributeValue()

the binding attribute on a listener tag to reference a managed bean that is also an instance of the corresponding listener interface.

In the previous chapter, we introduced you to LINQ to SQL and most of its terminology. We showed you how to generate the entity classes that most of the examples in the LINQ to SQL chapters will require. We also provided some common methods that many of the examples in these chapters will need. In this chapter, we will present some tips that we hope you will find useful while working with LINQ to SQL. We will also show you some of the tools that make using LINQ to SQL such a pleasure.

To be symmetrical with elements, it s only fair that attributes get a SetAttributeValue method every bit as powerful as the SetElementValue method; and they did. The XElement.SetAttributeValue method has the ability to add, delete, and update an attribute. Passing an attribute name that does not exist causes an attribute to be added. Passing a name that exists with a value other than null causes the attribute with that name to have its value updated to the value passed. Passing a name that exists with a null value causes the attribute to be deleted. Listing 7-84 is an example doing all three. Listing 7-84. Using SetAttributeValue to Add, Delete, and Update Attributes // I 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 the attributes:"); Console.WriteLine(xDocument); // This call will update the type attribute's value because an attribute whose // name is "type" exists. firstParticipant.SetAttributeValue("type", "beginner"); // // This call will add an attribute because an attribute with the specified name does not exist.

Now would be a good time to remind you that before you can run the examples in this chapter, you must have met the prerequisites. First, you must have the extended Northwind database and already generated the entity classes for it. Please review the section in 12 titled Prerequisites for Running the Examples to ensure that you have the appropriate database and generated entity classes. In this chapter, because we will be demonstrating code that uses entity classes generated by both SQLMetal and the Object Relational Designer, we will not specify a using directive for the nwind namespace in the examples. Instead, we will explicitly specify the namespace where it s needed for the nwind classes. This is necessary in this chapter to control which Customer entity class is referenced in each example. Since, by default, the Object Relational Designer generates a namespace that is the same as your project and since the examples will already exist in your project s namespace, you will not need to specify the namespace for the designer-generated entity classes, but you will for the SQLMetalgenerated entity classes.

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