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Mapping a Java artifact to an SQL expression is useful for more than integrating a legacy schema. You created two formula mappings already: The first, Using derived properties, in chapter 4, section 4.4.1, was a simple derived read-only property mapping. The second formula calculated the discriminator in an inheritance mapping; see chapter 5, section 5.1.3, Table per class hierarchy. You ll now apply formulas for a more exotic purposes. Keep in mind that some of the mappings you ll see now are complex, and you may be better prepared to understand them after reading all the chapters in part 2 of this book. Understanding the use case You now map a literal join condition between two entities. This sounds more complex than it is in practice. Look at the two classes shown in figure 8.2. A particular Item may have several Bids this is a one-to-many association. But it isn t the only association between the two classes; the other, a unidirectional

Manage Applications by Using Windows Installer Packages 25-21

A. msiexec /x http://www.contoso.com/patch.msi B. msiexec /update http://www.contoso.com/patch.msi C. msiexec /i http://www.contoso.com/patch.msi D. msiexec /url http://www.contoso.com/patch.msi

one-to-one, is needed to single out one particular Bid instance as the winning bid You map the first association because you d like to be able to get all the bids for an auctioned item by calling anItemgetBids() The second association allows you to call anItemgetSuccessfulBid() Logically, one of the elements in the collection is also the successful bid object referenced by getSuccessfulBid() The first association is clearly a bidirectional one-to-many/many-to-one association, with a foreign key ITEM_ID in the BID table (If you haven t mapped this before, look at chapter 6, section 64, Mapping a parent/children relationship ) The one-to-one association is more difficult; you can map it several ways The most natural is a uniquely constrained foreign key in the ITEM table referencing a row in the BID table the winning row, for example a SUCCESSFUL_ BID_ID column.

Which version of Windows Installer is included with Service Pack 2 for Windows XP Choose the correct answer. A. Windows Installer 1.0 B. Windows Installer 2.0 C. Windows Installer 3.0 D. Windows Installer 4.0

25-22

Legacy schemas often need a mapping that isn t a simple foreign key relationship Mapping a formula join condition Imagine that each row in the BID table has a flag column to mark the winning bid, as shown in figure 83 One BID row has the flag set to true, and all other rows for this auction item are naturally false Chances are good that you won t find a constraint or an integrity rule for this relationship in a legacy schema, but we ignore this for now and focus on the mapping to Java classes To make this mapping even more interesting, assume that the legacy schema didn t use the SQL BOOLEAN datatype but a CHAR(1) field and the values T (for true) and F (for false) to simulate the boolean switch.

25

Correct Answers: A A. Correct: By default, Windows XP does not wait for the network to be fully initialized at startup and logon. Existing users are logged on using cached credentials, which results in shorter logon times. Windows XP applies Group Policy in the background after the network becomes available. As a result, software installations usually take two or three logons. Enabling this setting causes Windows XP to wait for the network before logon so that Group Policy can be immediately applied. B. Incorrect: Setting this policy to zero forces clients to wait indefinitely while Group Policy scripts run. It will not ensure that the application is installed at the next login, however. C. Incorrect: This setting directs the system to wait for the remote copy of the roaming user profile to load, no matter how long it takes. Waiting for the remote profile is appropriate when users move between computers frequently, and the local copy of their profile is not always current. However, the users in this scenario have local user profiles, so enabling this setting will have no effect. D. Incorrect: This setting prevents Group Policy from being updated while the computer is in use. If you enable this setting, the system waits until the user logs off the system before updating Group Policy settings instead of refreshing settings on a regular basis. This setting would have no effect on how software is distributed.