This document discusses Windows Phone 7 and user data access on the Windows Phone platform. It provides an overview of LINQ to SQL and accessing user contacts and calendar appointments. It also covers best practices for database usage, schema upgrades, and querying user data, including using new APIs introduced in the "Mango" update. The document demonstrates examples of CRUD operations with LINQ to SQL, querying contacts, and searching appointments.

1. Windows Phone 7Li Jingnan / Wang Tao2011-7-151

2. 2 days2

3. ethoshttp://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. aboutanytao| Ethos<ethos:Member id = “Wang Tao” msn = anytao@live.comweibo = http://weibo.com/anytaorunat = “Senior System Architect”/>Jason | Ethos<ethos:Member id = “Li Jingnan” msn = zengnami@hotmail.comweibo= http://weibo.com/jn1981runat = “SE”/>

5. abouthttp://book.anytao.net

6. 10 Local DatabaseWang Tao / 2011-07-15

7. session outlineLINQ to SQLLINQ to User Dataoverviewarchitecturecode-first developmentimplementation detailsqueriesinserts, updates, deletes…database schema upgradesperformance and best practicesoverviewend-user consentsupported account typesimplementation detailsquerying contactsquerying appointmentsperformance and best practices

8. LINQ to everythingLINQObjectsXMLSQLUser DataOData7Mango

9. complex schemanumerous relationships and constraintsexample: shopping list7 tables100s of records5 foreign keys

10. Reference DataHuge amounts of static reference dataExample: dictionary app3 tables1 table with 500k rows

11. web service cacheCloud Servicefetch reference data from cloudcache it locallycombine with user-specific dataWindows PhoneService CacheUser Data

12. user datafilter contactsbirthdays in the next monthquery all appointmentsfind an available time for a meetingFilter

13. database support

14. local data storage: overviewapps store private data in Isolated Storagesettings and properties in the app dictionary

15. unstructured data in Isolated Storage files

16. structured data in database filesApp Root FolderInstallPackage ManagerCreates root foldersandboxed to AppDBDatabaseFile (r/o)App Data FolderCreates/Managesfiles and settingsAppWP7 Isolated Storage APIsDBApplicationSettings FileApplicationFilesDatabase file

17. architectureYour AppCustom Data ContextApp Objectsvar query = fromw indb.Wineswherew.Country== “USA"selectw.Name;System.Data.LinqIdentity ManagementChange TrackingUpdate ProcessingObject 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 Namefrom Wineswhere Country = “USA”Microsoft.Phone.Data.Internal Core ADO.NET (System.Data)SQL CE DBSQLCE ADO.NET Provider (System.Data.SqlServerCe)

18. code first developmentDesign timeCreate object model: wines, varietals, vineyards, etc.

19. Decorate objects with attributes for persistenceVarietalsWinesVineyardsWineMakersCreate DataContextreference to database

20. Translate object model into a database file

21. Submit API persists changes to DBRun timeDatabase upgradeCreate new objects to enable new features

22. Use upgrade APIs to change DBdatabase creation: example// Define the data context.publicpartialclassWineDataContext: DataContext{publicTable<Wine> Wines;publicTable<Vineyard> Vineyards;publicWineDataContext(stringconnection) : base(connection) { }}// Define the tables in the database[Table]publicclassWine{[Column(IsPrimaryKey=true]publicstringWineID{ get; set; }[Column]publicstringName { get; set; }……}// Create the database form data context, using a connection stringDataContextdb = newWineDataContext("isostore:/wineDB.sdf");if (!db.DatabaseExists()) db.CreateDatabase();

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

24. Inserts/Updates/DeletesYour App CodeIt’s all about the DataContextChanges made against the DataContext firstChanges persisted by calling SubmitChanges()SubmitChangesLINQ to SQL determines change set and submits to DBDataContextDB

25. inserts/updates/deletesupdateinsertWinenewWine= 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/deletesdeletevarvineyardsToDelete= fromVineyards v in db.Vineyardswherev.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/deletesvarvineyardsToDelete= 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 upgradesDatabaseSchemaUpdater allows for simple upgrades on your existing DBIt offers the ability to addTablesColumnsIndicesAssociations/foreign keysAll schema updates are transactionalMore complex schema upgrades require full DB migration

29. Database Schema UpgradesCreate a new DatabaseSchemaUpdaterMyDerivedDataContext context = newMyDerivedDataContext("foo.sdf");DatabaseSchemaUpdaterdbUpdater = context.CreateDatabaseSchemaUpdater();Add a new table tied to the Product classdbUpdater.AddTable<Winemaker>();Add a Region column to the Customer tabledbUpdater.AddColumn<Vineyard>(“YearEstablished");Execute upgradedbUpdater.Execute();

30. performance and best practiceskeep change sets smallSubmit early and often to avoid data loss on app terminationuse background threadsNon-trivial operations will impact app responsiveness if done on UI threadoptimize read-only queriesSet ObjectTrackingEnabled to minimize memory usageuse secondary indices for properties which you query often

31. performance and best practicespopulate large reference data tables in advanceCreate a simple project to prepopulate data in emulatorPull out database file using Isolated Storage explorerwhen to use a database…expect some impact to startup time and memory usage from incorporating a DBstick to IsolatedStorageSettings or basic files for small data sets

32. user data

33. new and updated APIs in “Mango”Chooser Tasks related to user dataEmailAddressChooserTaskPhoneNumberChooserTaskAddressChooserTaskMicrosoft.Phone.UserData for direct accessContactsAppointments

34. AddressChooserTaskprivateAddressChooserTaskaddressChooserTask;// ConstructorpublicMainPage(){this.addressChooserTask= newAddressChooserTask();this.addressChooserTask.Completed += newEventHandler<AddressResult>(addressChooserTask_Completed);}privatevoidaddressChooserTask_Completed(objectsender, AddressResulte){if(null == e.Error && TaskResult.OK == e.TaskResult) {... = e.DisplayName;... = e.Address;}}

35. Microsoft.Phone.UserDataImportant pointsContacts and Appointments APIs are read onlyThird 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 contactscontacts.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 timeend date and timeMaximum items to returnstate