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Node root; if (source instanceof DOMSource) { root = ((DOMSource)source).getNode(); } else if (source instanceof SAXSource) { InputSource inSource = ((SAXSource)source).getInputSource(); DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); dbf.setNamespaceAware(true); DocumentBuilder db = null; synchronized (dbf) { db = dbf.newDocumentBuilder(); } Document doc = db.parse(inSource); root = (Node) doc.getDocumentElement(); } else { throw new IllegalArgumentException( "Class type: " + source.getClass().getName()); } return root; } private static KeyPair generateDSAKeyPair() throws NoSuchAlgorithmException { KeyPairGenerator kpg = KeyPairGenerator.getInstance("DSA"); kpg.initialize(1024, new SecureRandom()); return kpg.generateKeyPair(); } private static XMLSignature generateXMLSignature(KeyPair keypair) throws NoSuchAlgorithmException, InvalidAlgorithmParameterException, KeyException { XMLSignatureFactory sigFactory = XMLSignatureFactory.getInstance(); Reference ref = sigFactory.newReference("#Body", sigFactory.newDigestMethod(DigestMethod.SHA1, null)); SignedInfo signedInfo = sigFactory.newSignedInfo( sigFactory.newCanonicalizationMethod( CanonicalizationMethod.INCLUSIVE_WITH_COMMENTS, (C14NMethodParameterSpec) null), sigFactory.newSignatureMethod(SignatureMethod.DSA_SHA1, null), Collections.singletonList(ref));

// STEP 3 - add the new object to the context collection for that type context.Employees.AddObject(myNewEmployee); // STEP 4 - save the changes to the database context.SaveChanges(); // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } In Listing 30-10, I have created the new Employee object using the static CreateXXX method that every entity type has. The Employee class has the CreateEmployee method, the Customer class has the CreateCustomer method, and so on. These methods have parameters for the properties that cannot be left null. Using these methods is good practice because it avoids a database error when you inadvertently leave a required field empty. For the Employee entity type, the required fields are for the employee ID and the person s first and last name. If we compile and run Listing 30-10, we can see a new record has been added to the Employees table. We can do this by opening the Database Explorer windows in Visual Studio Express and the Server Explorer in other editions of Visual Studio. Expand the Data Connections item, then the Northwind.mdf item, and then Tables. You will see the list of tables that the database contains, as illustrated by Figure 30-20.

Right-click the Employees table entry, and select Show Table Data. This will open a new window that contains the data currently in the Employees table, as shown in Figure 30-21. You can see that my new record has been created.

We can use the navigation properties to create associated objects and write them to the database. The Entity Framework will detect the relationship between the entity objects and insert them into the database together. Listing 30-11 provides an example. Listing 30-11. Inserting Attached Objects using using using using System; System.Collections.Generic; System.Linq; NorthwindModel;

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class Listing 11 { static void Main(string[] args) { // create a context NorthwindEntities context = new NorthwindEntities(); // create the new customer Customer cust = new Customer { CustomerID = "LAWN", CompanyName = "Lawn Wranglers", ContactName = "Mr. Abe Henry", ContactTitle = "Owner", Address = "1017 Maple Leaf Way", City = "Ft. Worth", Region = "TX",

PostalCode = "76104", Country = "USA", Phone = "(800) MOW-LAWN", Fax = "(800) MOW-LAWO" }; // create the new order Order ord = new Order { CustomerID = "LAWN", EmployeeID = 4, OrderDate = DateTime.Now, RequiredDate = DateTime.Now.AddDays(7), ShipVia = 3, Freight = new Decimal(24.66), ShipName = "Lawn Wranglers", ShipAddress = "1017 Maple Leaf Way", ShipCity = "Ft. Worth", ShipRegion = "TX", ShipPostalCode = "76104", ShipCountry = "USA" }; // attach the order to the customer cust.Orders.Add(ord); // add the new Customer context.Customers.AddObject(cust); // save the changes context.SaveChanges(); // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } Listing 30-11 creates a new Customer object and populated the fields. This time I have used the default constructor for the entity class, as opposed to the static CreateXXX method of the previous listing. I then create a new Order object. Also, using the default class constructor, I then attach to the Customer object using the Add method of the navigation property. I tell the context about the new Customer by using the AddObject method on the Customers property and then call the SaveChanges method. The context detects the newly added Order and writes the details of both objects to the database tables in a single step.

CHAPTER 6 EXTENSIBLE MARKUP LANGUAGE (XML)

To update data, you simply change the value assigned to properties of the entity objects that interest you and call SaveChanges. Listing 30-12 contains a demonstration, modifying the Employee record that I