birt code 128

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birt code 128,
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birt code 128,
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7.1 Finding the identity and role of a caller inside an EJB method 7.5 Assigning a role to an EJB 8.1 Formatting log messages 8.2 Improving logging performance

Aggregations are useful when writing report queries that deal with a collection of entities. In this section we ll discuss support of aggregate functions in JPQL. Aggregate functions

JPQL provides these aggregate functions: AVG, COUNT, MAX, MIN, and SUM. Each func-

This section presents, in detail, the syntax of the XML file for defining pointcuts with JBoss AOP. The default name for this file is jboss-aop.xml, but the name can be changed if necessary. The corresponding XML Document Type Definition (DTD) defines the <aop> tag as the root tag. Several pointcuts can be defined in the same file. Each pointcut is defined by the <bind> tag and associated with an interceptor by the <interceptor> tag. The general structure of a jboss-aop.xml file is as follows: < xml version="1.0" encoding="UTF-8" > <aop> <bind pointcut=" ... pointcut expression ... " > <interceptor class=" ... interceptor class ... " /> </bind> ... </aop>

There can be no question, my dear Watson, of the value of exercise before breakfast. Sherlock Holmes

tion s name suggests its purpose. The aggregate functions are commonly used in creating report queries. You can only use a persistence field with the AVG, MAX, MIN, and SUM functions, but you can use any type of path expression or identifier with the COUNT function. Table 10.13 shows all the aggregate functions supported by JPQL.

Table 10.13 JPQL aggregate functions Description Returns the average value of all values of the field it is applied to Returns the number of results returned by the query Returns the maximum value of the field it is applied to Returns the minimum value of the field it is applied to Returns the sum of all values on the field it is applied to Return Type Double

Depends on the type of the persistence field Depends on the type of the persistence field May return either Long or Double

A good build system can be a developer s best friend. Apache Ant provides the perfect combination of power and flexibility to meet all of your application building and deployment needs. Another important tool the EJB developer needs is a comprehensive testing utility. Apache Cactus, an open source framework, lets you build unit tests for your EJB functionality. In addition, you can use Ant to build a good regression test system with your unit tests. The recipes in this chapter demonstrate how to use Ant to build and deploy your EJBs and how to use Cactus for testing your EJBs. You will find recipes for the following topics in this chapter:

JBoss AOP allows you to define five types of pointcuts: method, constructor, field, all, and method call. Each of these types is associated with a specific keyword, which is used when you write a pointcut expression. In this section, we explain the common rules concerning the wildcards that are used to write pointcut expressions, we define the five types of pointcuts, and we give the rules for filtering joinpoints.

If we want to find the MAX value for the i.itemPrice field among all Items, use the following query:

If you want to find out how many Category entities exist in the system, use COUNT like this:

Using Ant for compilation Packaging beans into an ejb.jar file Generating stub classes Unit-testing stateless session beans Unit-testing stateful session beans Unit-testing an entity bean Automating test cases Executing test cases

You ve just seen some simple examples of aggregate functions. In the next section you ll learn how to aggregate results based on a path expression. Grouping with GROUP BY and HAVING In an enterprise business application, you may need to group data by some persistence field. Assuming that there is a one-many relationship between User and Category, this query will generate a report that lists the number of Category entities created by each c.user: