Windows Phone: multitasking and local database
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Windows Phone Mango introduces several new features for multitasking and local databases. Multitasking allows applications to remain resident in memory while suspending threads and detaching resources. This enables fast app switching as well as running background tasks and agents. The local database is stored in isolated storage using SQL Server Compact Edition and accessed via LINQ to SQL. Developers define database schemas and query data using a code-first approach.
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Windows Phone: multitasking and local database
- 1. Multitasking and Local Dababase in Windows Phone Mango Radu Vunvulea
- 2. Windows Phone Mango Multitasking
- 3. Multitasking Fast App Switching
- 4. Multitasking and Phone Health
- 5. Application Lifecycle Reload / refresh state only if needed Application is resident in memory; system detaches Save state but resources and pauses threads do not discard it
- 6. Application Lifecycle Reload / refresh state only if needed Application is resident in memory; system detaches Save state but resources and pauses threads do not discard it
- 7. Background transfer 20 20 MB MB 100 Unlimited MB
- 8. End-to-End Architecture Developer Application OS MyApp Solution MyApp.dll MyApp Project UX Single WMAppManifest Logic App Cloud ISO Store System Services MyAppAgent Project MyAppAgent.dll
- 9. Demo
- 10. Background Agents Ce ne este permis: Ce nu ne este permis: • Base API • Librarii XNA • Update de tile • Audio • Toasts • Senzori • Location • Microfon • Networking • Camera • Storage • UI
- 11. Differences Between Agents Periodic Agent • Runs every 30 minutes • Runs on external power • Any network connection • Non-cell network • Runs for 25 seconds connection • Used for location, data • Runs for 10 mins, recurring sync, etc. • Used for daily tasks, large data syncs, etc.
- 12. Windows Phone Mango Local Database
- 13. Where is database stored Application Isolated Storage LINQ to SQL Runtime Data Context (Sistem.Data.Linq) Local Database
- 14. Good to know • Isolated Storage is used to store database files • LINQ to SQL is used as the ORM engine • LINQ is used to query data • Only System.Data.Linq assembly must be added to the project.
- 15. Database design • Custom connection string format: Data Source='isostore:/MyDir/DbName.sdf' "Data Source='isostore:/MyDir/DbName.sdf'" • T-SQL queries are not supported • The code-first approach to defining the database schema is preferred in this version of Windows Phone 7.1 Mango.
- 16. Limitations • ADO.NET Objects are not supported • Skip() and Take() require an ordered list and constants values • Only Microsoft SQL CE data types are supported • BinaryFormatter is not supported by default (hack: CustomType and implement ToString() and Parse() in your custom class) • ExecuteCommand is not suported – NO T- SQL, NO DML statement, NO DDL
- 17. Process to follow to use SQL CE Implement all database classes: Create a new database (.sdf) file in Isolated Populate the database stored in the Isolated tables, columns, relations, datacontext, etc Storage(by default the database is empty) Storage with data
- 18. Code Sample
- 19. Questions
- 20. Multumesc Radu Vunvulea vunvulear@gmail.com vunvulearadu.blogspot.com