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sqlComm.Connection = sqlConn; try { sqlConn.Open(); System.Data.SqlClient.SqlDataReader reader = sqlComm.ExecuteReader(); For this example, let s pretend all the previous code already existed. Pretend this is legacy code that we need to update, and we would like to take advantage of LINQ to accomplish our new task. As you can see, there are no references to LINQ in the previous code. A SqlConnection is established, a query is formed, a SqlCommand is created, the connection is opened, and the query is performed all pretty much a run-of-the-mill ADO.NET database query. Now, let s add some LINQ code to do something. Northwind db = new Northwind(sqlConn); IEnumerable<Customer> custs = db.Translate<Customer>(reader); foreach (Customer c in custs) { Console.WriteLine("ID = {0} : Name = {1} : Contact = {2}", c.CustomerID, c.CompanyName, c.ContactName); } In the previous code, we instantiate our Northwind DataContext using our ADO.NET SqlConnection. We then call the Translate method, passing the already created reader so that the query results can be converted into a sequence of entity objects that we can then enumerate and display the results of. Normally, since this is legacy code, there would be some more code doing something with the results, but for this example, there is no point to have that code. All that is left is the method cleanup code. } finally { sqlComm.Connection.Close(); } The previous code simply closes the connection. This example demonstrates how nicely LINQ to SQL can play with ADO.NET. Let s take a look at the results of Listing 16-21: ID = LAZYK : Name = Lazy K Kountry Store : Contact = John Steel ID = TRAIH : Name = Trail's Head Gourmet Provisioners : Contact = Helvetius Nagy ID = WHITC : Name = White Clover Markets : Contact = Karl Jablonski

ExecuteCommand()

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The addClass() function adds a CSS class to the Element interface if it isn t already present on that object Conversely, the removeClass() function removes a CSS class from the Element interface if that selector is present on it Both of these functions use the hasClass() function, used to return the existence (true) or nonexistence (false) of a class on the Element interface All three of these functions are placed into the Element interface s prototype..

Like the ExecuteQuery method, the ExecuteCommand method allows you to specify an actual SQL statement to execute against the database. This means you can use it to execute insert, update, or delete

CHAPTER 11 INTRODUCING JAVA DATABASE CONNECTIVITY (JDBC)

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statements, as well as execute stored procedures. Also, like with the ExecuteQuery method, you can pass parameters into the method. One thing to be aware of when calling the ExecuteCommand method is that it executes immediately, and the SubmitChanges method does not need to be called.

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XDocument xDocument = new XDocument( new XElement("BookParticipants", new XElement("BookParticipant", new XAttribute("type", "Author"), new XElement("FirstName", "Joe"), new XElement("LastName", "Rattz")), new XElement("BookParticipant", new XAttribute("type", "Editor"), new XElement("FirstName", "Ewan"), new XElement("LastName", "Buckingham")))); IEnumerable<XElement> elements = xDocument.Element("BookParticipants").Descendants("FirstName"); // First, we will display the source elements. foreach (XElement element in elements) { Console.WriteLine("Source element: {0} : value = {1}", element.Name, element.Value); } // Now, we will display the ancestor elements for each source element. foreach (XElement element in elements.Ancestors("BookParticipant")) { Console.WriteLine("Ancestor element: {0}", element.Name); } The results now should only include the BookParticipant elements and of course the source elements, but the two BookParticipants elements that are displayed in the first prototype s example should now be gone: Source element: FirstName : value = Joe Source element: FirstName : value = Ewan Ancestor element: BookParticipant Ancestor element: BookParticipant And they are.

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