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As before, the primary key is composed of ITEM_ID and IMAGE_NAME. A composite element class like Image isn t limited to simple properties of basic type like filename. It may contain components, using the <nested-composite-element> declaration, and even <many-to-one> associations to entities. It may not own collections, however. A composite element with a many-to-one association is useful, and we ll come back to this kind of mapping later in this chapter. We re finally finished with value types; we ll continue with entity association mapping techniques. The simple parent/child association we mapped in chapter 3 is just one of many possible association mapping styles. Most of them are considered exotic and are rare in practice.

An API for performing basic CRUD operations on objects of persistent classes A language or API for specifying queries that refer to classes and properties of classes A facility for specifying mapping metadata A technique for the ORM implementation to interact with transactional objects to perform dirty checking, lazy association fetching, and other optimization functions

2009-02-12 04:00:00.000 2009-02-12 20:00:00.000 2009-02-13 08:00:00.000 2009-02-14 04:00:00.000 2009-02-14 12:00:00.000

acter collection to access the glyphs in the font. For simple fonts, you had an index ranging from 0 to 255; in contrast, a CID can be a number from 0 to 65,535. This is a great advantage when dealing with languages that have huge character sets, such as Chinese, Japanese, and Korean.

will draw the first letter of any element in a large bold red font. We can tighten up this rule a little, like this:

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If you delete a row in the parent table, you have to set to a prede ned default value all foreign keys of related rows in the child table. If you update a primary key in the parent table, you have to set to a prede ned default value all foreign keys of related rows in the child table.

A perfect example of when to write a service is when you're writing an application that needs to monitor an uninterruptible power supply (UPS) All the UPS software needs to do is to monitor when the UPS hardware reports a power failure, and when the power does go out, the UPS software needs to initiate a controlled shutdown Obviously, if the UPS software isn't running all the time (the first criterion for deciding whether your application should be a service), the shutdown won't happen and the computer will just stop when the UPS hardware runs out of battery power The UPS software doesn't really need a user interface (the second criterion) because it just needs to run in the background and monitor the UPS hardware.

}

private static void Operators() { Int32 a = 5; Int32 b = null;

However, Maps provide another option to the standard <index> element. If your collection is a Map, you can also use an entity for the index. To do that, you need to use the <map-key-many-to-many> element instead of the <index> element:

public interface BidManager{ void addBid(Bid bid); List<Bid> getBids(Item item); } @Local public interface BidManagerLocal extends BidManager { void cancelBid(Bid bid); } @Remote public interface BidManagerRemote extends BidManagerLocal { } @WebService public interface BidManagerWS extends BidManager { }

Also known as the back end, the web server responds to requests from clients for specific pages. It responds with an HTML page that includes instructions for how to generate the user interface.

If your web server has Microsoft FrontPage Extensions installed, you can install a compiled ASP.NET application right from the comfort and safety of your development environment. I just glossed over it back in 23, but Visual Studio presents you with the option of putting a web application on a real live web site when you first try to create the ASP.NET application. In the New Web Site form, you can select an HTTP URL as the development location, as shown in Figure 25-1.

namespace System { public class FlagsAttribute : System.Attribute { public FlagsAttribute() { } } }

One last warning: Embedding too many associations is a bad practice. To convince you, remember that Hibernate Search needs to read the data for all the associated entities. This could load a big object graph if too many associations are marked @IndexedEmbedded.

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