USING CLOUD SERVICES AS DATA STORES in Microsoft Word

Generate QR Code in Microsoft Word USING CLOUD SERVICES AS DATA STORES

CHAPTER 3 USING CLOUD SERVICES AS DATA STORES
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[DataMember] public string Description { get; set; } [DataMember] public string NoteText { get; set; } } }
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Coding the Service
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In the following steps, you will implement the NotepadService WCF contract defined in the foregoing section. You will be using the Entity Framework to access the SQL Azure database. Open Service1.svc.cs in the NotepadServiceRole project, and add the code blocks spelled out in the following sections.
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Coding AddUser Method
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AddUser will add a new user to the database. Notice that you are instantiating NotepadDBEntities, which is the Entity Framework generated context that connects to the SQL Azure NotepadDB. public Guid AddUser(Guid userId, string userName) { using (var context = new NotepadDBEntities()) { context.AddToUsers(new User() { UserId = userId, Name = userName, }); context.SaveChanges(); return userId; } }
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Coding AddNote Method
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Notice here in AddNote method after instantiating NotepadDBEntities, you are creating the Note entity that you generated in the foregoing steps using the Entity Framework Wizard. Once the note is saved, you are mapping to NoteDto to be sent to the client. public NoteDto AddNote(Guid userId, string notedescription, string noteText) { using (var context = new NotepadDBEntities()) { Note note = new Note() { Description = notedescription, UserId = userId,
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CHAPTER 3 USING CLOUD SERVICES AS DATA STORES
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NoteText = noteText, }; context.AddToNotes(note); context.SaveChanges(); return new NoteDto() { NoteId = note.NoteId, Description = note.Description, NoteText = note.NoteText, }; } }
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Coding UpdateNote Method
In order to update the note, first you need to instantiate the entity context that connects to NotepadDB, and then you must query for the note that you are going to update. Once the note is retrieved, you will then update the properties and save changes. public void UpdateNote(int noteId, string noteText) { using (var context = new NotepadDBEntities()) { var note = context .Notes .Where(n => n.NoteId.Equals(noteId) ).Single(); note.NoteText = noteText; context.SaveChanges(); } }
Coding DeleteNote Method
When deleting the note, the note must be retrieved first and then the retrieved note will be added to the DeleteObject of the Notes collection. Then save the changes where the delete will be performed by the Entity Framework. public void DeleteNote(Guid userId, int noteId) { using (var context = new NotepadDBEntities()) { var note = context .Notes .Where(n => n.NoteId.Equals(noteId)).Single(); context.Notes.DeleteObject(note); context.SaveChanges(); } }
CHAPTER 3 USING CLOUD SERVICES AS DATA STORES
Coding GetNotes Method
GetNotes will bring all the notes associated with the specific userId. You will be using a technique called Linq to Entity that closely resembles the SQL statement. And inside the Linq to Entity, you will be performing translation of the Note entity to NoteDto. This is a very useful technique for mapping an entity object to a data transfer object. public List<NoteDto> GetNotes(Guid userId) { using (var context = new NotepadDBEntities()) { var notes = ( from eachNote in context.Notes where eachNote.UserId == userId orderby eachNote.Description ascending select new NoteDto { NoteId = eachNote.NoteId, Description = eachNote.Description, NoteText = eachNote.NoteText, } ).ToList(); return notes; } }
Coding GetNote Method
GetNote will query a single user note from the database. public NoteDto GetNote(Guid userId, int noteId) { using (var context = new NotepadDBEntities()) { var notes = ( from eachNote in context.Notes where eachNote.NoteId == noteId && eachNote.UserId == userId select new NoteDto { NoteId = eachNote.NoteId, Description = eachNote.Description, NoteText = eachNote.NoteText, } ).SingleOrDefault(); return notes; } }
CHAPTER 3 USING CLOUD SERVICES AS DATA STORES
Testing Azure WCF NotepadService on Your Machine
You will be testing NotepadService on your machine so that when you connect to NotepadService from the Windows Phone Notepad application, you will be able to debug and step through NotepadService when the service call is made from the Notepad application. Press F5 and you will notice that the Development Fabric window appears with Internet Explorer. Development Fabric simulates the Azure service environment in your machine. Notice that when you expand NotepadService you see NotepadServiceRole, which is the WCF service that you coded in the foregoing steps. When NotepadService is deployed, you will see one instance of the service deployed, as shown in Figure 3 26. Do not stop the service, as you will be referencing the service from the Notepad application.
Figure 3 26. Development Fabric simulating the Azure Service environment In the previous steps, you created the NotepadDB database in SQL Azure and NotepadService hosted locally using Development AppFabric to simulate Windows Azure. In the following section, you
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