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When we call the SaveChanges() method in Listing 14-7 to update, insert, or delete, these actions are performed by the stored procedures in Listing 14-6 because of the mappings in Figure 14-9. Both the insert and update procedures return the updated TimeStamp value. This value is used by Entity Framework to enforce optimistic concurrency. Listing 14-7. Demonstrating the stored procedures mapped to the insert, update, and delete actions using (var context = new EFRecipesEntities()) { context.Accounts.AddObject(new Account { AccountNumber = "8675309", Balance = 100M, Name = "Robin Rosen"}); context.Accounts.AddObject(new Account { AccountNumber = "8535937", Balance = 25M, Name = "Steven Bishop"}); context.SaveChanges(); } using (var context = new EFRecipesEntities()) { // get the account var account = context.Accounts.First(a => a.AccountNumber == "8675309"); Console.WriteLine("Account for {0}", account.Name); Console.WriteLine("\tPrevious Balance: {0}", account.Balance.ToString("C")); // some other process updates the balance Console.WriteLine("[Rogue process updates balance!]"); context.ExecuteStoreCommand(@"update chapter14.account set balance = 1000 where accountnumber = '8675309'"); // update the account balance account.Balance = 10M; try { Console.WriteLine("\tNew Balance: {0}", account.Balance.ToString("C")); context.SaveChanges(); } catch (OptimisticConcurrencyException ex) { Console.WriteLine("Exception: {0}", ex.Message); } } The following is the output of the code in Listing 14-7: Account for Robin Rosen Previous Balance: $100.00 [Rogue process updates balance!]

As environments mature and grow larger, the distributed file sharing of P2P will give way to centralized file servers in what is typically described as a client-server, or twotier, environment Client-server environments offer a single and centralized location for users to access files that are needed by multiple users In a client-server environment, backup and security begin to play a much more critical role, because files are now accessible by multiple users who have access to that repository File permissions become critical to maintaining security The permissions and backup strategies are easier to deal with in client-server environments for two reasons First, because clientserver environments have dedicated servers to handle many of the tasks that clients will handle in P2P environments Second, because in a client-server environment, most data is stored on a server There are some inherent challenges to migrating from a P2P to a server-based filesharing environment.

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New Balance: $10.00 Exception: Store update, insert, or delete statement affected an unexpected number of rows (0). Entities may have been modified or deleted since entities were loaded. Refresh ObjectStateManager entries.

In this class, onSavePrompt() is overridden to suppress a warning about editing the location field. Since we don t actually save this field, the warning isn t necessary. Finally, Listing 2-5 shows the application s entry point, which creates and starts our RecordingChoicesScreen.

Some users might have a hard time moving away from their old method of sharing files The proper permission controls are often not set up correctly on the centralized data, if they are set up at all Client machines might continue to share files after the transition simply because they weren t configured to not share them This can lead to security issues that can be disastrous if not managed appropriately..

The code in Listing 14-7 demonstrates using the stored procedures we ve mapped to the insert, update, and delete actions. In the code, we purposely introduce an intervening update between the retrieval of an account object and saving the account object to the database. This rogue update causes the TimeStamp value to be changed in the database after we ve materialized the object in the object context. This concurrency violation is detected by Entity Framework because the number of rows affected by the UpdateAccount() procedure is zero. The mappings shown in Figure 14-9 tell Entity Framework how to keep the TimeStamp property correctly synchronized with the database and how to be informed of the number of rows affected by the insert, update, or delete actions. The Result Column for the insert and the update actions is mapped to the TimeStamp property on the entity. For the update action, we need to make sure that Entity Framework uses the original value from the entity when it constructs the statement invoking the UpdateAccount() procedure. These two settings keep the TimeStamp property synchronized with the database. Because our stored procedures return the number of rows affected the actions in an output parameter, we need to check the Rows Affected Parameter box for this parameter for each of the action mappings.

Listing 2-5. MediaGrabber Application package com.apress.king.mediagrabber; import net.rim.device.api.ui.UiApplication; public class MediaGrabber extends UiApplication { public static void main(String[] args) { new MediaGrabber().enterEventDispatcher(); } private MediaGrabber() { pushScreen(new RecordingChoicesScreen()); } }

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