Your SlideShare is downloading. ×
0
10 wp7   local database
10 wp7   local database
10 wp7   local database
10 wp7   local database
10 wp7   local database
10 wp7   local database
10 wp7   local database
10 wp7   local database
10 wp7   local database
10 wp7   local database
10 wp7   local database
10 wp7   local database
10 wp7   local database
10 wp7   local database
10 wp7   local database
10 wp7   local database
10 wp7   local database
10 wp7   local database
10 wp7   local database
10 wp7   local database
10 wp7   local database
10 wp7   local database
10 wp7   local database
10 wp7   local database
10 wp7   local database
10 wp7   local database
10 wp7   local database
10 wp7   local database
10 wp7   local database
10 wp7   local database
10 wp7   local database
10 wp7   local database
10 wp7   local database
10 wp7   local database
10 wp7   local database
10 wp7   local database
10 wp7   local database
10 wp7   local database
Upcoming SlideShare
Loading in...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×
Saving this for later? Get the SlideShare app to save on your phone or tablet. Read anywhere, anytime – even offline.
Text the download link to your phone
Standard text messaging rates apply

10 wp7 local database

3,534

Published on

Published in: Technology
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total Views
3,534
On Slideshare
0
From Embeds
0
Number of Embeds
1
Actions
Shares
0
Downloads
44
Comments
0
Likes
0
Embeds 0
No embeds

Report content
Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
No notes for slide

Transcript

  • 1. Windows Phone 7<br />Li Jingnan / Wang Tao<br />2011-7-15<br />1<br />
  • 2. 2 days<br />2<br />
  • 3. ethos<br />http://www.ethostechnologies.com/<br />One of the 1st ISVs for cloud computing in Europe and China.<br />Cloud computing development partner with Microsoft in Greater China Region.<br />Invited to speak about Azure at several Microsoft events.<br />
  • 4. about<br />anytao| Ethos<br /><ethos:Member<br /> id = “Wang Tao”<br /> msn = anytao@live.com<br />weibo = http://weibo.com/anytao<br />runat = “Senior System Architect”<br />/><br />Jason | Ethos<br /><ethos:Member<br /> id = “Li Jingnan”<br /> msn = zengnami@hotmail.com<br />weibo= http://weibo.com/jn1981<br />runat = “SE”<br />/><br />
  • 5. about<br />http://book.anytao.net<br />
  • 6. 10 Local Database<br />Wang Tao / 2011-07-15<br />
  • 7. session outline<br />LINQ to SQL<br />LINQ to User Data<br />overview<br />architecture<br />code-first development<br />implementation details<br />queries<br />inserts, updates, deletes…<br />database schema upgrades<br />performance and best practices<br />overview<br />end-user consent<br />supported account types<br />implementation details<br />querying contacts<br />querying appointments<br />performance and best practices<br />
  • 8. LINQ to everything<br />LINQ<br />Objects<br />XML<br />SQL<br />User Data<br />OData<br />7<br />Mango<br />
  • 9. complex schema<br />numerous relationships and constraints<br />example: shopping list<br />7 tables<br />100s of records<br />5 foreign keys<br />
  • 10. Reference Data<br />Huge amounts of static reference data<br />Example: dictionary app<br />3 tables<br />1 table with 500k rows<br />
  • 11. web service cache<br />Cloud Service<br />fetch reference data from cloud<br />cache it locally<br />combine with user-specific data<br />Windows Phone<br />Service Cache<br />User Data<br />
  • 12. user data<br />filter contacts<br />birthdays in the next month<br />query all appointments<br />find an available time for a meeting<br />Filter<br />
  • 13. database support<br />
  • 14. local data storage: overview<br />apps store private data in Isolated Storage<br /><ul><li>settings and properties in the app dictionary
  • 15. unstructured data in Isolated Storage files
  • 16. structured data in database files</li></ul>App Root Folder<br />Install<br />Package Manager<br />Creates root folder<br />sandboxed to App<br />DB<br />Database<br />File (r/o)<br />App Data Folder<br />Creates/Manages<br />files and settings<br />App<br />WP7 Isolated Storage APIs<br />DB<br />Application<br />Settings File<br />Application<br />Files<br />Database file<br />
  • 17. architecture<br />Your App<br />Custom Data Context<br />App Objects<br />var query = fromw indb.Wines<br />wherew.Country== “USA"<br />selectw.Name;<br />System.Data.Linq<br />Identity Management<br />Change Tracking<br />Update Processing<br />Object Materialization<br />.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}<br />select Name<br />from Wines<br />where Country = “USA”<br />Microsoft.Phone.Data.Internal<br /> Core ADO.NET (System.Data)<br />SQL CE DB<br />SQLCE ADO.NET Provider (System.Data.SqlServerCe)<br />
  • 18. code first development<br />Design time<br /><ul><li>Create object model: wines, varietals, vineyards, etc.
  • 19. Decorate objects with attributes for persistence</li></ul>Varietals<br />Wines<br />Vineyards<br />WineMakers<br /><ul><li>Create DataContextreference to database
  • 20. Translate object model into a database file
  • 21. Submit API persists changes to DB</li></ul>Run time<br />Database upgrade<br /><ul><li>Create new objects to enable new features
  • 22. Use upgrade APIs to change DB</li></li></ul><li>database creation: example<br />// Define the data context.<br />publicpartialclassWineDataContext: DataContext<br />{<br />publicTable<Wine> Wines;<br />publicTable<Vineyard> Vineyards;<br />publicWineDataContext(stringconnection) : base(connection) { }<br />}<br />// Define the tables in the database<br />[Table]<br />publicclassWine<br />{<br />[Column(IsPrimaryKey=true]<br />publicstringWineID{ get; set; }<br />[Column]<br />publicstringName { get; set; }<br />……<br />}<br />// Create the database form data context, using a connection string<br />DataContextdb = newWineDataContext("isostore:/wineDB.sdf");<br />if (!db.DatabaseExists()) db.CreateDatabase();<br />
  • 23. queries: examples<br />// Create the database form data context, using a connection string<br />DataContextdb = newWineDataContext("isostore:/wineDB.sdf");<br />// Find all wines currently at home, ordered by date acquired<br />varq = from w indb.Wines<br /> wherew.Varietal.Name == “Shiraz” && w.IsAtHome == true<br />orderbyw.DateAcquired<br /> select w;<br />
  • 24. Inserts/Updates/Deletes<br />Your App Code<br />It’s all about the DataContext<br />Changes made against the DataContext first<br />Changes persisted by calling SubmitChanges()<br />SubmitChanges<br />LINQ to SQL determines change set and submits to DB<br />DataContext<br />DB<br />
  • 25. inserts/updates/deletes<br />update<br />insert<br />WinenewWine= newWine<br />{<br />WineID= “1768",<br />Name = “Windows Phone Syrah",<br />Description = “Bold and spicy"<br />};<br />db.Wines.InsertOnSubmit(newWine);<br />db.SubmitChanges();<br />Winewine= <br />(fromw indb.Wines<br /> wherew.WineID== “1768"<br />select w).First();<br />wine.Description= “Hints of plum and melon";<br />db.SubmitChanges();<br />
  • 26. inserts/updates/deletes<br />delete<br />varvineyardsToDelete= <br />fromVineyards v in db.Vineyards<br />wherev.Country== “Australia”<br />select v;<br />db.Vineyards.DeleteAllOnSubmit<br />(vineyardsToDelete);<br />db.SubmitChanges();<br />Foreign key constraint will cause exception here if Wines associated with the Vineyards are not deleted first<br />
  • 27. inserts/updates/deletes<br />varvineyardsToDelete= fromVineyards v indb.Vineyards<br /> wherev.Country== “Australia"<br />select v;<br />foreach (Vineyards v invineyardsToDelete)<br />{<br />db.Wines.DeleteAllOnSubmit(v.Wines);<br />}<br />db.Vineyards.DeleteAllOnSubmit(vineyardsToDelete);<br />db.SubmitChanges();<br />
  • 28. database schema upgrades<br />DatabaseSchemaUpdater allows for simple upgrades on your existing DB<br />It offers the ability to add<br />Tables<br />Columns<br />Indices<br />Associations/foreign keys<br />All schema updates are transactional<br />More complex schema upgrades require full DB migration<br />
  • 29. Database Schema Upgrades<br />Create a new DatabaseSchemaUpdater<br />MyDerivedDataContext context = newMyDerivedDataContext("foo.sdf");DatabaseSchemaUpdaterdbUpdater = context.CreateDatabaseSchemaUpdater();<br />Add a new table tied to the Product class<br />dbUpdater.AddTable<Winemaker>();<br />Add a Region column to the Customer table<br />dbUpdater.AddColumn<Vineyard>(“YearEstablished");<br />Execute upgrade<br />dbUpdater.Execute();<br />
  • 30. performance and best practices<br />keep change sets small<br />Submit early and often to avoid data loss on app termination<br />use background threads<br />Non-trivial operations will impact app responsiveness if done on UI thread<br />optimize read-only queries<br />Set ObjectTrackingEnabled to minimize memory usage<br />use secondary indices for properties which you query often<br />
  • 31. performance and best practices<br />populate large reference data tables in advance<br />Create a simple project to prepopulate data in emulator<br />Pull out database file using Isolated Storage explorer<br />when to use a database…<br />expect some impact to startup time and memory usage from incorporating a DB<br />stick to IsolatedStorageSettings or basic files for small data sets<br />
  • 32. user data<br />
  • 33. new and updated APIs in “Mango”<br />Chooser Tasks related to user data<br />EmailAddressChooserTask<br />PhoneNumberChooserTask<br />AddressChooserTask<br />Microsoft.Phone.UserData for direct access<br />Contacts<br />Appointments<br />
  • 34. AddressChooserTask<br />privateAddressChooserTaskaddressChooserTask;<br />// Constructor<br />publicMainPage()<br />{<br />this.addressChooserTask= newAddressChooserTask();<br />this.addressChooserTask.Completed += new<br />EventHandler<AddressResult>(<br />addressChooserTask_Completed);<br />}<br />privatevoidaddressChooserTask_Completed(objectsender, AddressResulte)<br />{<br />if(null == e.Error && TaskResult.OK == e.TaskResult)<br /> {<br />... = e.DisplayName;<br />... = e.Address;<br />}<br />}<br />
  • 35. Microsoft.Phone.UserData<br />Important points<br />Contacts and Appointments APIs are read only<br />Third party social network data cannot be shared<br />
  • 36. Contacts/Appointments Data Shared<br />
  • 37. contacts: hello, world!<br />Contactscontacts = newContacts();<br />contacts.SearchCompleted+= newEventHandler<ContactsSearchEventArgs>((sender, e) =><br /> {<br />...= e.Results;<br /> });<br />// E.g. search for all contacts<br />contacts.SearchAsync(string.Empty, FilterKind.None, null);<br />state<br />// E.g. search for all contacts with display name matching "ja"<br />contacts.SearchAsync("ja", FilterKind.DisplayName, null);<br />filter expression<br />(not a regex)<br />Filter kind: name, email , phone or pinned to start)<br />
  • 38. appointments: hello, world!<br />Appointmentsappointments = newAppointments();<br />appointments.SearchCompleted+= newEventHandler<AppointmentsSearchEventArgs>((sender, e) =><br /> {<br />... = e.Results;<br /> });<br />// E.g. get next appointment (up to 1 week away)<br />appointments.SearchAsync(DateTime.Now,<br />DateTime.Now+ TimeSpan.FromDays(7),<br /> 1, null);<br />start date and time<br />end date and time<br />Maximum items to return<br />state<br />
  • 39. performance and best practices<br />be responsible<br />your privacy policy should cover how you use the user’s contact information<br />keep out of the way<br />users have widely varying contact list sizes <br />your UI should handle delays gracefully <br />don’t let data get stale<br />data returned is a snapshot<br />refresh state when reasonable<br />
  • 40. demo<br />35<br />/ linq to sql<br />/ datacontext<br />/ CRUD<br />/ user data<br />04 user manager<br />
  • 41. practice<br />36<br />a todo list<br />
  • 42. thank you<br />37<br />thank youwww.anytao.com<br />
  • 43. 38<br />

×