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Listing 9-5. The code for the Order POCO class and the related object context public class Order { public int OrderId { get; set; } public string Product { get; set; } public int Quantity { get; set; } public string Status { get; set; } public byte[] TimeStamp { get; set; } } public class EFRecipesEntities : ObjectContext { public EFRecipesEntities() : base("name=EFRecipesEntities", "EFRecipesEntities") { } private IObjectSet<Order> orders; public IObjectSet<Order> Orders { get { return orders (orders = CreateObjectSet<Order>()); } } }

public class BookBinding { public BookBinding() {} public SqlDataReader GetBookList() { String sql = "select BookId, Title From Book order by Title"; SqlConnection cn = new SqlConnection(WebStaticConnectionString); SqlCommand cm = new SqlCommand(sql,cn); cnOpen(); return cmExecuteReader(CommandBehaviorCloseConnection); } The default constructor is required so that the control can create an instance of the type You could omit it from this code, because you have no custom constructors, but if you have a custom constructor on your type, you must explicitly add the default constructor, even if it does nothing (like the preceding constructor) The GetBookList serves as the select method of the binding operation Here you re simply passing through a SqlDataReader Using code like this, you re really using the ObjectDataSource to bind directly to a data access layer.

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Listing 9-6. Our WCF service contract [ServiceContract] public interface IService1 { [OperationContract] Order InsertOrder(); [OperationContract] void UpdateOrderWithoutRetrieving(Order order); [OperationContract] void UpdateOrderByRetrieving(Order order); } Listing 9-7. The implementation of our service contract public class Service1 : IService1 { public Order InsertOrder() { using (var context = new EFRecipesEntities()) { // remove previous test data context.ExecuteStoreCommand("delete from chapter9.[order]"); var order = new Order { Product = "Camping Tent", Quantity = 3, Status = "Received" }; context.Orders.AddObject(order); context.SaveChanges(); return order; } } public void UpdateOrderWithoutRetrieving(Order order) { using (var context = new EFRecipesEntities()) { context.Orders.Attach(order); if (order.Status == "Received") { var entry = context.ObjectStateManager .GetObjectStateEntry(order); entry.SetModifiedProperty("Quantity"); context.SaveChanges(); } } } public void UpdateOrderByRetrieving(Order order) {

Figure 8 4. Mapplet 2.0 hotel filter requirements, nested inside the Functional Requirements package

using (var context = new EFRecipesEntities()) { var dbOrder = context.Orders .Single(o => o.OrderId == order.OrderId); if (dbOrder != null && StructuralComparisons.StructuralEqualityComparer .Equals(order.TimeStamp, dbOrder.TimeStamp)) { dbOrder.Quantity = order.Quantity; context.SaveChanges(); } } } } Listing 9-8. The client we use to test our WCF service class Program { static void Main(string[] args) { var service = new Service1Client(); var order = service.InsertOrder(); order.Quantity = 5; service.UpdateOrderWithoutRetrieving(order); order = service.InsertOrder(); order.Quantity = 3; service.UpdateOrderByRetrieving(order); } } If you set a breakpoint on the first line in the Main() method of the client and debug the application, you can step through the inserting the order and updating the order using both methods.

This is still a vast improvement over putting the data access code directly in the markup, and it doesn t take much code do You could call a stored procedure instead of using inline SQL, which would be even better You can use this control to bind any of the controls listed in Table 11-2 Here you ll create a ListBox bound to the ObjectDataSource: <asp:ListBox ID="lbBookList" runat="server" DataSourceID="odsBookList" Width=600px DataTextField="Title" DataValueField="BookID" Rows=12 AutoPostBack="True" /> This renders a list of books displaying the title and carrying the BookID as the underlying value of the list items It s really not much less code than it would take to do this in 1x The main differences here are that there s no code in the code-behind of our page (the BookBinding.

You ve probably gathered by now that we quite like EA. One reason is that you can easily use EA along with the Agile ICONIX add-in to create test cases from your requirements. In EA, right-click either a single requirement, a package of requirements, or inside a requirements diagram. Then choose Create Tests from Requirements 4 (see Figure 8 7). This will produce something like the diagram shown in Figure 8 8.

context.SaveChanges(); } catch (OptimisticConcurrencyException ex) { Console.WriteLine("Concurrency Exception! {0}", ex.Message); } catch (Exception ex) { Console.WriteLine("Exception! {0}", ex.Message); } } The following is the output of the code in Listing 14-1: High Country Backpacking Tent Unit Price: $199.95 Changing High Country Backpacking Tent's Unit Price to: $239.95 Concurrency Exception! Store update, insert, or delete statement affected an unexpected number of rows (0). Entities may have been modified or deleted since entities were loaded. Refresh ObjectStateManager entries.

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