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AS UPDATE Projects SET Name=@name, Started=@started, Ended=@ended, Description=@description WHERE Id=@id AND LastChanged=@lastChanged IF @@ROWCOUNT = 0 RAISERROR('Row has been edited by another user', 16, 1) SELECT @newLastChanged = LastChanged FROM Projects WHERE Id=@id RETURN Again, this procedure only updates the record in the Projects table; the related records in the Assignments table are updated separately. Notice the @lastChanged parameter required by the procedure. This represents the last known timestamp value for the row. In 8, you ll see how this value is maintained by the business object. When the object attempts to update the row, it provides the last known value for the LastChanged column. If that value hasn t changed in the database, then no other user has updated the row since the object read its data. But if the value has changed in the database, then some other user did change the data in the row since the object read the data. First-write-wins optimistic concurrency specifies that this second update can t be allowed, because it could overwrite changes made by that other user. The UPDATE statement itself uses this parameter in the WHERE clause to ensure that the row is only updated if the value matches. The procedure then checks to see if the row was actually updated. If no rows were updated, it raises an error, which shows up as a database exception in the data access code of the business object. On the other hand, if the update goes through and the row is changed, then a SELECT statement is executed to return the new value of the LastChanged column as an output parameter, so that the object can maintain the new value to allow possible future updates.

So, when should you consider the manual approach of application encryption If you ask me, the answer is pretty much almost never. The only time it would be necessary is if you are using Oracle s Standard Edition (SE) or lower, which does not support the Advanced Security Option (ASO). Often, people will utilize SE as a cost savings approach, but if you find that you have to implement the functional equivalent of ASO yourself (doing the key management, implementing all of the code, and performing the necessary application modifications because this approach is definitely not transparent to the application), you might find the cost of Enterprise Edition justified. In-house-developed software is not free after all.

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Listing 5-34. Using an ArrayList // arraylist.cpp using namespace System; using namespace System::Collections; int main() { ArrayList^ array_list = gcnew ArrayList(); array_list->Add("apple"); array_list->Add("banana"); // Iterate using the for each operator. for each (String^ s in array_list) { Console::WriteLine( s ); } // Iterate using indexing. for (int i = 0; i < array_list->Count; i++) { Console::WriteLine("{0} {1}", i, array_list[i]); } } The output of Listing 5-34 is as follows: apple banana 0 apple 1 banana The problem with the ArrayList class is that it represents an untyped collection. Unlike an array, which forces its elements to be of the specified type, the ArrayList used in the previous example has no such enforcement. Fortunately, there is a solution in the form of the generic ArrayList class. As you saw briefly in 2, it is possible in C++/CLI to use a generic class that contains an unknown type parameter. In the .NET Framework generic List class, in the namespace System::Collections::Generic, the element type is the generic type parameter. Using this generic List class, you can have a strongly typed version of the ArrayList (see Listing 5-35). For more information on generics, see 11.

If you don t like this behavior, your business class can override the framework s Save() and BeginSave() methods and replace that logic with other logic.

If you are not ready to send your message, but want to save it as a draft message to send later, follow these steps: 1. 2. 3. Compose your message, as described earlier. Press the Cancel button in the upperleft corner. Select the Save Draft button at the bottom of the screen.

Only a warning message is issued. The rows that violated the unique index are not inserted, although all other rows are inserted successfully. When performing multirow inserts, if the IGNORE_DUP_KEY option is omitted, then an error message is generated within SQL Server if some of the rows violate the unique index. The batch is rolled back, and no rows are inserted into the table.

We have, however, closed all of our sessions. If we open another session using some other user account and query (replacing OPS$TKYTE with your account name, of course): $ sqlplus / as sysdba SQL*Plus: Release 11.2.0.1.0 Production on Wed May 12 14:08:16 2010 Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production With the Partitioning, OLAP, Data Mining and Real Application Testing options sys%ORA11GR2> select * from v$session where username = "OPS$TKYTE"; no rows selected

The last of the changes to the File class is the deprecation of the toURL() method. Someone finally realized that the toURL() method returns invalid URLs when a space is in the file system path. Now, the appropriate way to get a URL for a File is to get its URI with toURI(), and then convert the URI to a URL with the toURL() method. For example

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