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We re using the term full ORM to include any persistence layer where SQL is automatically generated from a metadata-based description We aren t including persistence layers where the object/relational mapping problem is solved manually by developers hand-coding SQL with JDBC With ORM, the application interacts with the ORM APIs and the domain model classes and is abstracted from the underlying SQL/JDBC Depending on the features or the particular implementation, the ORM engine may also take on responsibility for issues such as optimistic locking and caching, relieving the application of these concerns entirely Let s look at the various ways ORM can be implemented Mark Fussel (Fussel, 1997), a developer in the field of ORM, defined the following four levels of ORM quality We have slightly rewritten his descriptions and put them in the context of today s Java application development.

Using Event Viewer 18-13

2. In the Control Panel window, click Performance And Maintenance. 3. In the Performance And Maintenance window, click Administrative Tools. 4. In the Administrative Tools window, double-click Event Viewer. 5. In the left pane, click the log you want to view. Windows displays the events in the log file in the right window, as shown in Figure 18-7.

Pure relational The whole application, including the user interface, is designed around the relational model and SQL-based relational operations This approach, despite its deficiencies for large systems, can be an excellent solution for simple applications where a low level of code reuse is tolerable Direct SQL can be fine-tuned in every aspect, but the drawbacks, such as lack of portability and maintainability, are significant, especially in the long run Applications in this category often make heavy use of stored procedures, shifting some of the work out of the business layer and into the database Light object mapping Entities are represented as classes that are mapped manually to the relational tables Hand-coded SQL/JDBC is hidden from the business logic using wellknown design patterns This approach is extremely widespread and is successful for applications with a small number of entities, or applications with generic, metadata-driven data models.

a. Incorrect: You can deploy an RDP file by sending it to users in an e-mail. B. Incorrect: You can deploy an RDP file by placing it on a shared network drive. c. Correct: You cannot use Group Policy to deploy an RDP file because Group Policy can

You will encounter five types of events in the logs you view in Event Viewer. A unique icon identifies each event type so that you can easily distinguish between entries. The five types of events you will encounter are as follows: Error This type of entry, indicated by an icon with a red X, means that a significant problem has occurred, such as a service that might not have started properly. Warning This type of entry, indicated by an icon with a yellow exclamation point, means that an event has occurred that is not currently detrimental to the system but might indicate a possible future problem. Information This type of entry, indicated by an icon with a blue i, means that a successful operation has occurred. For example, a service starting successfully might trigger this type of event. Audit Success This type of entry, indicated by a key icon, means that an audited security access attempt for example, a successful logon to the system was successful. Audit Failure This type of entry, indicated by a lock icon, means that an audited security access attempt for example, a failed attempt to open an audited file or directory was not successful.

18-14

Stored procedures may have a place in this kind of application Medium object mapping The application is designed around an object model SQL is generated at build time using a code-generation tool, or at runtime by framework code Associations between objects are supported by the persistence mechanism, and queries may be specified using an object-oriented expression language Objects are cached by the persistence layer A great many ORM products and homegrown persistence layers support at least this level of functionality It s well suited to medium-sized.

18

Double-click any event in the right pane of Event Viewer to open the Event Properties dialog box (see Figure 18-8), which shows a description of the event. The up and down arrow buttons let you move through the events in the log without having to close the Event Properties dialog box and then reopen it for each event you want to view. The Copy button (showing the Copy icon) copies the information about the event to the Windows Clipboard.