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An example of this table structure is shown in figure 7.15. Here is the first major problem with this kind of association: You can t add a foreign key constraint to the DEFAULT_BILLING_DETAILS_ID column, because some values refer to the BANK_ACCOUNT table and others to the CREDIT_CARD table. Thus, you need to come up with some other way to ensure integrity (a trigger, for example). This is the same issue you d face with a <union-subclass> strategy. Furthermore, it s difficult to write SQL table joins for this association. In particular, the Hibernate query facilities don t support this kind of association mapping, nor may this association be fetched using an outer join. We discourage the use of <any> associations for all but the most special cases. Also note that this mapping

1. Ken is not an expert user and he wants you to help him solve his problem. He would also like to watch while you help him. What feature could you use to help Ken remotely while he watches

7. 8.

You could use Remote Assistance to help Ken. While you are connected to Ken s computer, you can take control of his desktop while he watches.

Summary

2. After connecting to Ken s computer, you want to determine what service or services are failing to start. How would you do this

You should open Event Viewer and view the System log. Events marking services that fail to start are marked with a red icon that has an X.

technique isn t available with annotations or in Java Persistence (this mapping is so rare that nobody asked for annotation support so far). As you can see, as long as you don t plan to create an association to a class hierarchy mapped with implicit polymorphism, associations are straightforward; you don t usually need to think about it. You may be surprised that we didn t show any JPA or annotation example in the previous sections the runtime behavior is the same, and you don t need any extra mapping to get it.

3. You have determined that only one service is failing to start, and that service is related to Ken s backup program. You decide to use the Add/Remove Programs utility to remove the backup program from Ken s computer. After removing the program, Windows displays a message stating that some parts of the program could not be installed because they are running and that it needs to you restart the computer to finish the removal. When the computer restarts, you still see the error message stating that a service has failed to load, and the program is still listed in the Add/Remove Programs dialog box as being installed. What should you do

You should stop the service and disable it. You can do this by using the Services console. Stopping the service should allow you to remove the program. Disabling the service will prevent it from running at startup in case the program needs to restart to finish the installation.

Summary

4. After taking care of the service, you use Add/Remove Programs again to try to uninstall the program. However, the Add/Remove Programs utility tells you that the uninstallation file could not be found and that the removal process cannot continue. You suspect that during the previous removal attempt, the uninstallation file was deleted. You decide that you need to restore Ken s computer to a configuration from before he installed the program. How can you do this

You should use System Restore. Most likely, Ken did not create a manual restore point, and it is also unlikely that the setup program for the backup utility created one. You should find the most recent automatic restore point and restore the computer to that point.

In this chapter, you learned how to map more complex entity associations. Many of the techniques we ve shown are rarely needed and may be unnecessary if you can simplify the relationships between your classes. In particular, many-to-many entity associations are often best represented as two one-to-many associations to an intermediate entity class, or with a collection of components. Table 7.1 shows a summary you can use to compare native Hibernate features and Java Persistence.

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