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In a medium- or large-sized application, it usually makes sense to organize classes by concern. Persistence is one concern; others include presentation, workflow, and business logic.1 A typical object-oriented architecture includes layers of code that represent the concerns. It s normal and certainly best practice to group all classes and components responsible for persistence into a separate persistence layer in a layered system architecture. In this section, we first look at the layers of this type of architecture and why we use them. After that, we focus on the layer we re most interested in the persistence layer and some of the ways it can be implemented.

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As an example of instance members, the following code shows the poker program with three instances of class Player. Figure 4-4 shows that each instance has a different value for the Name field. class Dealer { ... } class Player { string Name; ... } class Program { static void Main() { Dealer theDealer Player player1 Player player2 Player player3 ... } } // Declare class // Declare class // Field

Structs are always implicitly sealed, and hence, you cannot derive other structs from them. Since structs do not support inheritance, the use of several of the class member modifiers with struct members would not make sense; thus, they cannot be used in their declarations. The modifiers that cannot be used with structs are the following: protected internal abstract virtual Structs themselves are, under the covers, derived from System.ValueType, which is derived from object. The one inheritance-associated keyword you can use with a struct member is the new modifier, to override the implementation of a member of base class System.ValueType.

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interesting ways to simulate these and other object-oriented constructs. For this reason, when talking about client JavaScript code, we often borrow terms such as class, method, interface, and others from the common terminology used in objectoriented programming. For example, when we talk about a client class, we re referring to a class created in JavaScript with the Microsoft Ajax Library. We re ready to start exploring the library. The first step is learning how to load the library s script files in a web page.

Note that there are two format methods here: format and localeFormat. The only difference is that the format method is culture invariant, meaning that regardless of the current culture, it always uses the same formatting for the date. If you wanted to display culture-sensitive dates (so that dates are displayed differently based on the country and/or language), you first have to set the EnableScriptGlobalization property of the ScriptManager control to true. This ensures that the current culture is serialized and sent to the browser for the ASP.NET AJAX client library to correctly process the desired date format based on the specified culture settings. Table 4-3 lists the various formatting options supported by the format methods of the Date extension.

Don t worry too much if the methods are not immediately obvious. Except for the methods related to the query API (createQuery, createNamedQuery, and createNativeQuery), we ll discuss them in detail in the coming sections. The few EntityManager interface methods that we didn t just cover are rarely ever used, so we won t spend time discussing them. Once you ve read and understood the material in this chapter, though, we encourage you to explore them on your own. The EJB 3 Java Persistence API final specification is available at http://jcp.org/en/jsr/ detail id=220.

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