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A single call to merge() makes any modification and addition persistent. Remember that merge() isn t the same as reattachment: It returns a new value that you should bind to the current variable as a handle to current state after merging. Some cascading options aren t standardized, but Hibernate specific. You map these annotations (they re all in the org.hibernate.annotations package) if you re working with the Session API or if you want an extra setting for EntityManager (for example, org.hibernate.annotations.CascadeType.DELETE_ ORPHAN). Be careful, though custom cascading options in an otherwise pure JPA application introduce implicit object state changes that may be difficult to communicate to someone who doesn t expect them. In the previous sections, we ve explored the entity association cascading options with Hibernate XML mapping files and Java Persistence annotations. With transitive state changes, you save lines of code by letting Hibernate navigate and cascade modifications to associated objects. We recommend that you consider which associations in your domain model are candidates for transitive state changes and then implement this with cascading options. In practice, it s extremely helpful if you also write down the cascading option in the UML diagram of your domain model (with stereotypes) or any other similar documentation that is shared between developers. Doing so improves communication in your development team, because everybody knows which operations and associations imply cascading state changes. Transitive persistence isn t the only way you can manipulate many objects with a single operation. Many applications have to modify large object sets: For example, imagine that you have to set a flag on 50,000 Item objects. This is a bulk operation that is best executed directly in the database.

DEPTNO JOB HEADCOUNT -------- -------- --------14 >>> ADMIN 2 >>> MANAGER 3 >>> TRAINER 4 >>> DIRECTOR 1 >>> SALESREP 4 10 3 10 MANAGER 1 10 DIRECTOR 1 10 ADMIN 1 20 5 20 MANAGER 1 20 TRAINER 4 30 6 30 MANAGER 1 30 SALESREP 4 30 ADMIN 1

In this practice, you use the jQuery skills for selectors, animation, and AJAX that you learned in the lesson. You create a webpage to look up an employee and display the results back to the page.

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The dollar sign image is stored on the CD-ROM under \Materials\Pictures\Dollar.tif It is interesting that there seems to be a smooth transition between the chart area and the image . Also, take a look at how the chart border has been formatted . The plot area is designed with the 3-D option Soft Round . This gives you a very slightly three-dimensional depth, like a framed picture . However, there is just one visually disappointing disadvantage associated with using column charts: the columns are generally too far forward, practically on the outer edge of the mock border instead of being set back on the lower edge of the picture area . In this case, a little trick rectified the problem . As is frequently the case, two very important components of chart design play a role here: axis scaling and number formatting .

When a client needs a resource, it first attempts to obtain one from the resource pool by using getResource() to look for a resource with the description rd. If the pool cannot provide a matching resource, the client falls back to the normal mechanism and creates a new resource either directly or through a factory. The client then uses either the resource obtained from the pool or the freshly created one. When the client is finished with the resource, instead of releasing it, the client returns it to the resource pool. That way, when a resource is needed the next time, the pool can provide it. If the pool does not accept a resource, the client calls dispose() to discard the resource. Figure 7.3 depicts the scenario from the earlier snippet in a sequence diagram. In summary, resource pools provide a way for you to recycle resources which means you avoid the cost of creating and destroying a new resource every time you need one. The result is improved overall system performance. 7.1.2 Resource pooling issues When resource pooling is implemented in conventional ways, it leads to several problems common to a crosscutting concern. You are undoubtedly familiar with the issues of code tangling and scattering by now, so let s examine a couple of other issues in a bit more detail:

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