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protected void cmdUpdate_Click(object sender, EventArgs e) { // Only allow updating if a record is currently selected. if (gridProducts.SelectedIndex != -1) { // Use a LINQ expression to find the selected product. int selectedProductID = (int)gridProducts.SelectedDataKey.Value; var matches = from p in entities.Products where p.ProductID == selectedProductID select p; // Execute the query and return the entity object. Product product = matches.Single(); // Change the entity object. product.UnitsInStock -= 1; // Commit the changes back to the database. entities.SaveChanges(); } }

Tip SaveChanges() also returns an integer that indicates how many records were updated. So if you get a

public void pauseApp() { } public void destroyApp(boolean unconditional) { mCanvas.stop(); } public void commandAction(Command cmd, Displayable disp) { if (cmd == exitCommand) { try { destroyApp(false); notifyDestroyed(); } catch(Exception e) { e.printStackTrace(); } } } }

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Inserting a new record is nearly as easy. The best approach is to use the static factory method of the appropriate entity class. So if you want to create a new product, call Product.CreateProduct(). Then, add the new object to the NorthwindEntities.Products collection using the AddObject() method, and commit the update with SaveChanges(): protected void cmdInsert_Click(object sender, EventArgs e) { // The CreateProduct() method requires the three non-nullable Product fields // as arguments: ProductID, ProductName, and Discontinued. However, the // ProductName isn't actually used--when the update is finsihed, it's replaced // by the automatically generated ID that the database creates. Product newProduct = Product.CreateProduct(0, "Thick-As-Cement Milkshake", false); // You can now set additional properties that aren't required. newProduct.CategoryID = 1; newProduct.UnitsInStock = 10; newProduct.UnitPrice = 15.99M; // Finally, commit the changes and insert the record in the database. entities.Products.AddObject(newProduct); entities.SaveChanges(); }

In the following sections, we are going to look at some of the features that are unique to the BizTalk RFID Mobile platform that make it easy for you to build mobile applications.

Finally, a delete operation is the simplest data operation of all. You simply need to call the DeleteObject() method of the appropriate collection, followed by SaveChanges(). The following code retrieves the currently selected product object and removes it from the database using this approach: protected void cmdDelete_Click(object sender, EventArgs e) { // Check if a row is selected. if (gridProducts.SelectedIndex != -1) { // Use a LINQ expression to find the selected product. int selectedProductID = (int)gridProducts.SelectedDataKey.Value; var matches = from p in entities.Products where p.ProductID == selectedProductID select p; // Execute the query and return the entity object. Product product = matches.Single(); // Delete the record from the database. entities.Products.DeleteObject(product); entities.SaveChanges(); // Clear the selection (which may now be pointing to a different row.) gridProducts.SelectedIndex = -1; } } The Entity Framework uses a fairly sophisticated change tracking system to make these operations work. When you call SaveChanges(), the context object attempts to commit all of the changes in the data that it s tracking, including updates, deletions, and insertions. If you have related records, the Entity Framework will apply the changes in an order that makes sense (for example, it won t attempt to insert a child record before inserting a linked parent). This ability is more interesting if you use the Entity Framework in a rich desktop application, where you might keep the entity objects in memory for a long period of time, and periodically commit a batch of updates. But in a web application, where your page lives for only a few seconds (or less), you ll almost always create a new context object, perform all your database operations immediately, and then discard it.

Lights, Camera, Action!

Note When you call SaveChanges(), all the changes are performed as part of a single transaction. If an error

occurs, the entire process is rolled back, but your objects remain in their current state, with any new and edited information. That means you can programmatically resolve the problem and call SaveChanges() again.

Creating a 3D scene is like shooting a film on a movie set. You need to create the objects to render, orchestrate their movement, set up light(s), and set up camera(s). The M3G API comes with a full set of classes to support this staging. You can manually create the objects that will be rendered. In Listing 15-1, this involves the definition of the triangle and the rotation. The M3G engine needs to be informed of where the triangle is and what sort of appearance it should take on.

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