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To illustrate how similar the execution of JPQL and native SQL queries is, let s execute the named native query findUserWithMoreItems (which we defined earlier in a session bean method):

return em.createNamedQuery("findUserWithMoreItems") .setParameter(1, 5) .getResultList();

Obviously, you should modify the build properties file to represent your particular folder structure for both source and build directories. After running Ant with this setup, you should see the class file in your build directory. Without executing the clean target, successive runs of Ant will compile any source files that have changed since the previous execution.

This statement first creates a query instance for the named native query findUserWithMoreItems. Next, the required positional parameter is set. Finally, we return the result set.

public abstract aspect EJBResolver { static protected TxHome txHome; static protected AccountHome accountHome; [...] // Other homes... Account around(String accountID) throws Exception: execution( private Account *.findAccountByPrimaryKey(String) && args(accountID) { return accountHome.findByPrimaryKey(accountID); } Tx around(String txID) throws Exception: execution(private Tx *.findTxByPrimaryKey(String)) && args(txID) { return txHome.findByPrimaryKey(txID); }

If you re a big fan of SQL, you may be willing to exploit the power of databasestored procedures. Unfortunately, JPA doesn t support stored procedures, and you have to depend on a proprietary feature of your persistence provider. However, you can use simple stored functions (without out parameters) with a native SQL query.

After compiling the EJB source files, you want Ant to also package the new class files into an ejb.jar file.

Well, it appears you made it through the jungle of native SQL queries relatively unscathed. We hope you can see that while it is possible to drop down into the bowels of SQL from JPA, we don t recommend it. Embedding SQL into Java strings can be very time-consuming when it comes to debugging. And you lose all the benefits that JPQL affords you. However, if you really do need to go native, JPA will make it possible.

10.5 Summary

After building class files, you need to package them into an ejb.jar file along with the XML deployment descriptor that describes your EJBs. The JDK includes a JAR

his chapter introduces the basic concepts of AOP. Although AOP is relatively new, many of the basic concepts are already well established. This chapter gives a general introduction to the concepts of AOP, and the rest of the chapters demonstrate the use of these concepts with the four most advanced tools that are currently available: AspectJ/AspectWerkz, JAC, JBoss AOP, and Spring. Every new programming paradigm brings with it a set of concepts and definitions. This was the case for the procedural approach, with the notions of the module and the procedure, and for the object-oriented approach, with the concepts of encapsulation, inheritance, and polymorphism. Important changes accompanied each of these new paradigms. From a technical point of view, the structure of the programs changed radically, so those involved in software development were required to learn new techniques. As with the previous paradigms, AOP brings a set of new concepts to the table. However, improvements in the quality of applications and the increased modularity that AOP allows counterbalance the costs of learning the new concepts. Since the majority of AOP environments (including AspectJ/AspectWerkz, JAC, JBoss AOP, and Spring) are built on Java, this book uses the terminology and the concepts of Java; however, none of the concepts of AOP are specific to this language. In the same way that the concept of the object can be applied with success to various languages, the concept of the aspect can be implemented with C++ (AspectC++), C# (AspectC#), Smalltalk (Apostle), and even procedural languages such as C (AspectC). Furthermore, the concepts of AOP are important not only during the coding phase but earlier in the software development during the conceptual program-design phase. Tools such as Theme/UML and JAC UML Aspectual Factory (UMLAF) propose Unified Modeling Language (UML) notations to model AOP concepts.

Queries are an important piece of the persistence puzzle, and in this chapter we explored the various query capabilities provided by the EJB 3 Java Persistence API. JPA uses the following three methods to query entities: