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The standard arithmetic and comparison operators also handle nullable types. There is also a special operator called the null coalescing operator, which returns a non-null value to an expression, in case a nullable type variable is null. The null coalescing operator consists of two contiguous question marks and has two operands: The first operand is a variable of a nullable type. The second is a non-nullable value of the same underlying type. If, at run time, the first operand evaluates to null, the second operand is returned as the result of the operation.

Naturally, an interceptor that wraps the getAuction() and endAuction() methods and supplies the correct EntityManager instance can be more convenient. It also avoids the concern leaking upward to the presentation layer. You d get this interceptor for free if you wrote your controller as a stateful EJB session bean. When you try to apply this strategy with an extended persistence context that spans the whole conversation, you ll probably run into an issue that can break atomicity of the conversation automatic flushing. Preventing automatic flushing Consider the following conversation, which adds an event as an intermediate step:

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There s also a corresponding MarkNew() method: Protected Overridable Sub MarkNew() mIsNew = True mIsDeleted = False MarkDirty() End Sub Typically, this method is called upon deletion of an existing object, but it can be used any time the business developer knows that the object does not correspond to data in the database In such a case, not only is the object new, but it must also be dirty, because the data in the object does not match data in the database The concept of being marked for deletion will be discussed later with the IsDeleted property, but a new object shouldn t be marked for deletion, and so this flag is set to False Knowing whether an object is new or old will allow for implementation of the data access code in 4.

account = (Account) sqlMap.queryForObject( "Account.getByIdValue", new Integer(1));

The UndoableBase class is where all the work to handle n-level undo for an object will take place. This is pretty complex code that makes heavy use of reflection to find all the fields in each business object, take snapshots of their values, and then (potentially) restore their values later in the case of an undo operation. Remember, nothing requires the use of n-level undo. In many web scenarios, as demonstrated in 10, there s no need to use these methods at all. A flat UI with no Cancel button has no requirement for undo functionality, so there s no reason to incur the overhead of taking a snapshot of the object s data. On the other hand, when creating a complex Windows Forms UI that involves modal dialog windows to allow editing of child objects (or even grandchild objects), it is often best to call these methods to provide support for the OK and Cancel buttons on each of the dialog windows.

The IsNew property will control the choice of whether to insert or update data into the database..

Extending to binary formats Before leaving the subject of interface rendering with XSLT, we should highlight the abilities of XSLT formatting objects. A popular requirement for advanced web applications today is to dynamically generate binary files that are more difficult or impossible to manipulate once generated.

Even though this back reference isn t visible to developers, it s completely visible to the .NET serialization infrastructure. When serializing an object, the serialization mechanism will trace this reference and attempt to serialize any objects (including forms) that are handling the events. Obviously, this is rarely desirable. In fact, if the handling object is a form, this will fail outright with a runtime error because forms aren t serializable.

The web service implementation can be found in the ProjectTracker solution. It is named PTWebService. As with the Windows Forms and Web Forms interfaces, I won t go through every method in detail. Instead I ll pick out some representative methods that highlight the concepts and you can examine the rest at your leisure.

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