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Updating the data model

From: Windows Phone SDK Essential Training

Video: Updating the data model

Surprise, surprise! Here we find ourselves in Visual Studio again. Let's update the data model now to have it access to database to do the querying to build our initial set of items and to implement the logic we need for the details page. So move over here is the Solution Explorer, open up the MainViewModel.cs, and put our new version in and see what we've changed. To start with, we have a local intense variable, we're going to hold the Sonnets dbDataContext.

Updating the data model

Surprise, surprise! Here we find ourselves in Visual Studio again. Let's update the data model now to have it access to database to do the querying to build our initial set of items and to implement the logic we need for the details page. So move over here is the Solution Explorer, open up the MainViewModel.cs, and put our new version in and see what we've changed. To start with, we have a local intense variable, we're going to hold the Sonnets dbDataContext.

And in our MainViewModel Constructor we're going ask the App class for the instances of the database that we've created there. Also as we did before, we're going to create art to ObservableCollection of ItemsViewModels for items and favorite items. All that remains the same. What's going to change now is the logic inside load data. So instead of looking at the data that we got from XML--which is what we did before--we're simply going to query the database for the Sonnets.

So the way you do queries using the SQL is to simply say var sonnetsInDB equals from sonnets, variable S, in dbDataContext.Item--remember that was the table we defined over layer in dbData Context. Select this and so that the equivalent of select star from Sonnets in the database. And now that we have that, we're going to create an observable collection of those sonnets in order to be able to iterate over them and create our ItemViewModel, and we'll simply then company properties from the Sonnet Objects into the ItemViewModel objects.

And then we added to the items list and again to the favorites list if it is a favorite sonnet, and that's all we need to do to love the data from the database. You can also see that add item to favorites and remove items from favorites are the same as what we use for the flat file version of Sonnets plus. But you might notice that the update database method is missing, and that's because we're going to use link to SQL over in the details page in order to do the actual updates. We don't need to do the updates here because we're not managing the XML file anymore.

So let's move on to updating the details page and fire this puppy up and see if it runs.

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This video is part of

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Windows Phone SDK Essential Training

65 video lessons · 3303 viewers

Michael Lehman
Author

 
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  1. 2m 34s
    1. Welcome
      55s
    2. What you need to know to take this course
      51s
    3. Using the exercise files
      48s
  2. 15m 44s
    1. Downloading and installing the Windows Phone tools
      2m 44s
    2. Creating a Hello World application
      9m 31s
    3. Debugging on a Windows Phone device
      3m 29s
  3. 6m 29s
    1. Exploring device capabilities
      2m 58s
    2. Understanding the Emulator
      3m 31s
  4. 8m 51s
    1. Understanding the SDK
      8m 51s
  5. 41m 32s
    1. Introducing the converter
      3m 36s
    2. Creating the user experience (UX)
      13m 35s
    3. Responding to the Application Bar
      2m 40s
    4. Implementing click handlers
      3m 52s
    5. Saving and loading settings
      8m 18s
    6. Preparing your app for shipment
      9m 31s
  6. 20m 48s
    1. Introducing sonnets
      1m 38s
    2. Data binding with Silverlight
      4m 4s
    3. Exploring the Model-View-ViewModel pattern (MVVM)
      4m 2s
    4. Implementing the Master-Detail pattern using pages
      3m 53s
    5. Loading external data
      7m 11s
  7. 50m 26s
    1. Choosing a multipage controller
      3m 13s
    2. Preparing for persistence
      7m 30s
    3. Updating the data model
      7m 2s
    4. Creating the details page
      4m 30s
    5. Bringing it all together
      3m 58s
    6. Cloning a Windows Phone app
      6m 49s
    7. Using SQL CE
      8m 49s
    8. Updating the data model
      2m 24s
    9. Querying and updating the database
      6m 11s
  8. 14m 19s
    1. Working with the camera
      6m 11s
    2. Exploring GPS
      5m 21s
    3. Exploring the accelerometer
      2m 47s
  9. 29m 34s
    1. Introducing recording and playback with XNA
      45s
    2. Capturing sound
      5m 12s
    3. Providing feedback while recording
      5m 50s
    4. Playing a recording
      4m 34s
    5. Persisting a recording
      2m 58s
    6. Listing recordings
      5m 15s
    7. Managing the recording list
      3m 26s
    8. Recording under the lock screen
      1m 34s
  10. 28m 32s
    1. Building the UX
      3m 54s
    2. Using WebClient
      4m 1s
    3. Determining network connectivity
      2m 9s
    4. Leveraging Internet Explorer
      7m 56s
    5. Adding a live tile
      2m 42s
    6. Building a background agent
      7m 50s
  11. 14m 46s
    1. Hello World in C++
      4m 35s
    2. Libraries
      4m 17s
    3. Managed plus managed
      5m 54s
  12. 26m 35s
    1. Exploring built-in controls
      4m 28s
    2. Windows Phone Toolkit
      2m 42s
    3. Introducing Coding4Fun
      3m 13s
    4. Reminders and notifications
      6m 10s
    5. Wallet and In-App Purchase
      1m 34s
    6. File and protocol associations
      1m 59s
    7. Bluetooth
      44s
    8. Integrating speech
      1m 28s
    9. Near field communication (NFC)
      1m 23s
    10. WinRT and legacy Windows Phone APIs
      2m 54s
  13. 12m 14s
    1. Publishing your apps
      2m 49s
    2. Learning from apps in the Windows Phone Marketplace
      1m 22s
    3. Staying in touch with updates and new information from Microsoft
      2m 34s
    4. Looking at Windows Phone 7 app reviews
      44s
    5. Exploring web sites books and other useful links
      4m 45s
  14. 1m 34s
    1. Farewell
      1m 34s

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