1. Windows Phone 7 Li Jingnan / Wang Tao 2011-7-15 1

2. 2 days 2

3. ethos http://www.ethostechnologies.com/ One of the 1st ISVs for cloud computing in Europe and China. Cloud computing development partner with Microsoft in Greater China Region. Invited to speak about Azure at several Microsoft events.

4. about anytao| Ethos <ethos:Member id = “Wang Tao” msn = anytao@live.com weibo = http://weibo.com/anytao runat = “Senior System Architect” /> Jason | Ethos <ethos:Member id = “Li Jingnan” msn = zengnami@hotmail.com weibo= http://weibo.com/jn1981 runat = “SE” />

5. about http://book.anytao.net

6. 10 Local Database Wang Tao / 2011-07-15

7. session outline LINQ to SQL LINQ to User Data overview architecture code-first development implementation details queries inserts, updates, deletes… database schema upgrades performance and best practices overview end-user consent supported account types implementation details querying contacts querying appointments performance and best practices

8. LINQ to everything LINQ Objects XML SQL User Data OData 7 Mango

9. complex schema numerous relationships and constraints example: shopping list 7 tables 100s of records 5 foreign keys

10. Reference Data Huge amounts of static reference data Example: dictionary app 3 tables 1 table with 500k rows

11. web service cache Cloud Service fetch reference data from cloud cache it locally combine with user-specific data Windows Phone Service Cache User Data

12. user data filter contacts birthdays in the next month query all appointments find an available time for a meeting Filter

13. database support

15. unstructured data in Isolated Storage files

16. structured data in database filesApp Root Folder Install Package Manager Creates root folder sandboxed to App DB Database File (r/o) App Data Folder Creates/Manages files and settings App WP7 Isolated Storage APIs DB Application Settings File Application Files Database file

17. architecture Your App Custom Data Context App Objects var query = fromw indb.Wines wherew.Country== “USA" selectw.Name; System.Data.Linq Identity Management Change Tracking Update Processing Object Materialization .Call System.Linq.Queryable.Select( .Call System.Linq.Queryable.Where( .Constant(Table(Wines)), '(.Lambda #Lambda1)), '(.Lambda #Lambda2)) .Lambda #Lambda1(db.Wines $w) { $w.Country== “USA" } .Lambda #Lambda2(w.Country $w) { $w.Name} select Name from Wines where Country = “USA” Microsoft.Phone.Data.Internal Core ADO.NET (System.Data) SQL CE DB SQLCE ADO.NET Provider (System.Data.SqlServerCe)

20. Translate object model into a database file

23. queries: examples // Create the database form data context, using a connection string DataContextdb = newWineDataContext("isostore:/wineDB.sdf"); // Find all wines currently at home, ordered by date acquired varq = from w indb.Wines wherew.Varietal.Name == “Shiraz” && w.IsAtHome == true orderbyw.DateAcquired select w;

24. Inserts/Updates/Deletes Your App Code It’s all about the DataContext Changes made against the DataContext first Changes persisted by calling SubmitChanges() SubmitChanges LINQ to SQL determines change set and submits to DB DataContext DB

25. inserts/updates/deletes update insert WinenewWine= newWine { WineID= “1768", Name = “Windows Phone Syrah", Description = “Bold and spicy" }; db.Wines.InsertOnSubmit(newWine); db.SubmitChanges(); Winewine= (fromw indb.Wines wherew.WineID== “1768" select w).First(); wine.Description= “Hints of plum and melon"; db.SubmitChanges();

26. inserts/updates/deletes delete varvineyardsToDelete= fromVineyards v in db.Vineyards wherev.Country== “Australia” select v; db.Vineyards.DeleteAllOnSubmit (vineyardsToDelete); db.SubmitChanges(); Foreign key constraint will cause exception here if Wines associated with the Vineyards are not deleted first

27. inserts/updates/deletes varvineyardsToDelete= fromVineyards v indb.Vineyards wherev.Country== “Australia" select v; foreach (Vineyards v invineyardsToDelete) { db.Wines.DeleteAllOnSubmit(v.Wines); } db.Vineyards.DeleteAllOnSubmit(vineyardsToDelete); db.SubmitChanges();

28. database schema upgrades DatabaseSchemaUpdater allows for simple upgrades on your existing DB It offers the ability to add Tables Columns Indices Associations/foreign keys All schema updates are transactional More complex schema upgrades require full DB migration

29. Database Schema Upgrades Create a new DatabaseSchemaUpdater MyDerivedDataContext context = newMyDerivedDataContext("foo.sdf");DatabaseSchemaUpdaterdbUpdater = context.CreateDatabaseSchemaUpdater(); Add a new table tied to the Product class dbUpdater.AddTable<Winemaker>(); Add a Region column to the Customer table dbUpdater.AddColumn<Vineyard>(“YearEstablished"); Execute upgrade dbUpdater.Execute();

30. performance and best practices keep change sets small Submit early and often to avoid data loss on app termination use background threads Non-trivial operations will impact app responsiveness if done on UI thread optimize read-only queries Set ObjectTrackingEnabled to minimize memory usage use secondary indices for properties which you query often

31. performance and best practices populate large reference data tables in advance Create a simple project to prepopulate data in emulator Pull out database file using Isolated Storage explorer when to use a database… expect some impact to startup time and memory usage from incorporating a DB stick to IsolatedStorageSettings or basic files for small data sets

32. user data

33. new and updated APIs in “Mango” Chooser Tasks related to user data EmailAddressChooserTask PhoneNumberChooserTask AddressChooserTask Microsoft.Phone.UserData for direct access Contacts Appointments

34. AddressChooserTask privateAddressChooserTaskaddressChooserTask; // Constructor publicMainPage() { this.addressChooserTask= newAddressChooserTask(); this.addressChooserTask.Completed += new EventHandler<AddressResult>( addressChooserTask_Completed); } privatevoidaddressChooserTask_Completed(objectsender, AddressResulte) { if(null == e.Error && TaskResult.OK == e.TaskResult) { ... = e.DisplayName; ... = e.Address; } }

35. Microsoft.Phone.UserData Important points Contacts and Appointments APIs are read only Third party social network data cannot be shared

36. Contacts/Appointments Data Shared

37. contacts: hello, world! Contactscontacts = newContacts(); contacts.SearchCompleted+= newEventHandler<ContactsSearchEventArgs>((sender, e) => { ...= e.Results; }); // E.g. search for all contacts contacts.SearchAsync(string.Empty, FilterKind.None, null); state // E.g. search for all contacts with display name matching "ja" contacts.SearchAsync("ja", FilterKind.DisplayName, null); filter expression (not a regex) Filter kind: name, email , phone or pinned to start)

38. appointments: hello, world! Appointmentsappointments = newAppointments(); appointments.SearchCompleted+= newEventHandler<AppointmentsSearchEventArgs>((sender, e) => { ... = e.Results; }); // E.g. get next appointment (up to 1 week away) appointments.SearchAsync(DateTime.Now, DateTime.Now+ TimeSpan.FromDays(7), 1, null); start date and time end date and time Maximum items to return state

39. performance and best practices be responsible your privacy policy should cover how you use the user’s contact information keep out of the way users have widely varying contact list sizes your UI should handle delays gracefully don’t let data get stale data returned is a snapshot refresh state when reasonable

40. demo 35 / linq to sql / datacontext / CRUD / user data 04 user manager

41. practice 36 a todo list

42. thank you 37 thank youwww.anytao.com

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