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This will also retrieve User entities that do not have a matching Category, as well as Users that do. It s worth noting that, if an outer join is not used, the query would only retrieve the users with the matching Category, but would fail to retrieve users that do not have a matching Category. Are there any other types of JOINs supported by JPQL We re glad you asked! The final type is called the fetch join. Fetch joins In a typical business application, you may want to query for a particular entity but also retrieve its associated entities at the same time. For example, when we retrieve a Bid in the ActionBazaar system, we want to eagerly load and initialize the associated instance of Bidder. We can use a fetch join in JPQL to retrieve an associated entity as a side effect of the retrieval of an entity:

You can attach an interceptor to a pointcut with the <interceptor> tag. The only mandatory information is the name of the class that implements the interceptor. For example, the following declaration <bind pointcut="execution(* aop.jboss.Order->*(..))"> <interceptor class="aop.jboss.MyInterceptor" /> </bind> associates the aop.jboss.MyInterceptor interceptor to the pointcut that includes the executions of all the methods defined in the Order class. Optionally, interceptors can be named. The assigned name can be referenced in the jboss-aop.xml file whenever the corresponding interceptor needs to be reused. This feature avoids copy-and-paste errors by removing useless, redundant declarations of an interceptorclass name. The following lines of code illustrate the usage of a named interceptor: <interceptor class="aop.jboss.MyInterceptor" name="myInter" /> <bind pointcut="execution(* aop.jboss.Order->*(..))"> <interceptor-ref name="myInter" /> </bind> In this example, the interceptor aop.jboss.MyInterceptor interceptor is named myInter. This name is used in the pointcut definition (see the <interceptor-ref> tag).

XDoclet uses every piece of information it has on a bean to generate applicable files. The generated utility object uses the names declared in the public static final member variables of the home and local home interfaces to perform lookups, making your code more stable.

A fetch join is generally useful when you have lazy loading enabled for your relationship but you want to eagerly load the related entities in a specific query. You can use FETCH JOIN with both inner and outer joins. Did you have any idea there was so much to JPQL If you didn t know any better you might think it was a whole other language Oh wait, it is! And it s just waiting for you to give it a test drive. We hope you were able to get your bearings so that you can get started with JPQL and put it to work in your applications. We re in the home stretch of this chapter, with only a couple of topics left. We still need to discuss native SQL queries, but first we ll talk about bulk updates and deletes.

ActionBazaar categorizes its users by Gold, Platinum, and similar terms based on the number of successful trades in a year. At the end of the year, an application module is executed that appropriately set the user status. You could run a query to retrieve the collection of User entities and then iterate through the collection and update the status. An easier way is to use a bulk UPDATE statement to update the collection of entities matching the condition, as in this example:

You ve seen some examples of DELETE and UPDATE statements in JPQL in previous sections, but we avoided any in-depth discussion until now. Let s assume that ActionBazaar administrators need functionality to remove instances of entities such as Users based on certain conditions. We start with the following code:

2.1 Generating home, remote, local, and local home interfaces 2.2 Adding and customizing the JNDI name for the home interface