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Because we ve moved the Complaint.tt template file, we need to edit it to change the reference to the .edmx file for the model. Edit the Complaint.tt template and change the line string inputFile = @"Recipe13.edmx" to string inputFile = @"..\ComplaintData\Recipe13.edmx". You may have named your .edmx file something else; if so, make the changes so that the relative path is correct to your .edmx file. Edit the Complaint.Context.tt template (which should still be in the ComplaintData project) and add using ComplaintEntities; after each <autogenerated> comment section. This will put the using statement in each generate file. Add a WCF Service Application project to your solution. Name this application ComplaintService. Add project references to the ComplaintData and ComplaintEntities. Add a reference to System.Data.Entity. Copy the <connectionStrings> section from the App.Config file in the ComplaintData project to the web.config file in the ComplaintService project. This will allow Entity Framework to connect to the database. Replace the IService1 interface definition IService1.cs file with the code in Listing 13-23. Replace the Service1 implementation in the Service1.svc.cs file with the code in Listing 13-24.
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10. Add a Windows Console Application project to the solution. Name the project TestClient. The order of the following two steps is important. First, add a reference to the ComplaintEntities project. Next, add a service reference to the ComplaintService. The order is important here because the default behavior (click the Advance button to change this) is to reuse types in all the referenced assemblies. By adding a reference to ComplaintEntities first, when we add the service reference, the CustomerComplaint type from ComplaintEntities is used in place of the ones from ComplaintService. 11. Use the code in Listing 13-25 for the TestClient. Build the solution. 12. Set the TestClient as the Startup Project. Open the SQL Profiler and step through the TestClient. Notice that the call to UpdateComplaint() causes the update statement in Listing 13-26 to be sent to the database. This update statement updates all the columns. We only changed the ActionTaken column. To send just the updated column, do the next two steps. 13. Edit the Complaint.tt template file. Change the following lines: OriginalValueMembers originalValueMembers = new OriginalValueMembers(allMetadataLoaded, metadataWorkspace, ef); to the following: OriginalValueMembers originalValueMembers = new OriginalValueMembers(false, metadataWorkspace, ef); 14. Edit the Complaint.Context.tt template file. Change the following line:
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context.ObjectStateManager.ChangeObjectState(entity, EntityState.Modified); to the following: context.ObjectStateManager.ChangeObjectState(entity, EntityState.Unchanged); 15. Build and run the TestClient again. The SQL Profiler should show that the SQL in Listing 13-27 is sent to the database. Listing 13-23. The IService1 interface definition in the IService1.cs file using ComplaintEntities; namespace ComplaintService { [ServiceContract] public interface IService1 { [OperationContract] void InsertTestRecord(); [OperationContract] CustomerComplaint GetNextComplaint(); [OperationContract] CustomerComplaint UpdateComplaint(CustomerComplaint complaint); } } Listing 13-24. The Service1 implementation in the Service1.svc.cs file using System.Data.Entity; using ComplaintEntities; using ComplaintData; namespace ComplaintService { public class Service1 : IService1 { public void InsertTestRecord() { using (var context = new EFRecipesEntities()) { context.ExecuteStoreCommand( "delete from chapter13.customercomplaint"); var complaint = new CustomerComplaint { Comment = "Your store should open early on Saturdays", ReportedBy = "Jill Morgan" }; context.CustomerComplaints.AddObject(complaint); context.SaveChanges(); } }
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public CustomerComplaint GetNextComplaint() { using (var context = new EFRecipesEntities()) { var complaint = context.CustomerComplaints .Where(c => c.ActionTaken == null).First(); complaint.StartTracking(); return complaint; } } public CustomerComplaint UpdateComplaint(CustomerComplaint complaint) { using (var context = new EFRecipesEntities()) { context.CustomerComplaints.ApplyChanges(complaint); context.SaveChanges(); complaint.AcceptChanges(); return complaint; } } } } Listing 13-25. Code for the TestClient console application. This application is used to test the WCF service. using ComplaintEntities; using TestClient.ServiceReference1; namespace TestClient { class Program { static void Main(string[] args) { using (var client = new Service1Client()) { // insert a test record client.InsertTestRecord(); var next = client.GetNextComplaint(); next.ActionTaken = "Your issue is being reviewed"; client.UpdateComplaint(next); } } } } Listing 13-26. Original update statement that updates each of the columns exec sp_executesql N'update [13].[CustomerComplaint] set [Comment] = @0, [ReportedBy] = @1, [ActionTaken] = @2 where ([CustomerComplaintId] = @3)',
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