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As we explained earlier, JPQL statements are translated to SQL statements by the persistence provider. There is no equivalent of the IS EMPTY clause in SQL. So, you must be wondering what SQL statement is generated when IS EMPTY is used. The IS EMPTY clause is used with a collection-valued path expression that is typically an association field, and therefore the generated SQL statement will be determining whether the JOIN for the association retrieves any record in a subquery. To clarify, let s examine this JPQL query:

Service Composition: The wide array of specifications in the WS-I Basic Profile cannot be implemented in every Web service. Developers must pick and choose which specifications are important for a particular Web service. To enable this, Web services supports service composition, which allows developers to selectively pick specifications and to aggregate them and record them in the WSDL document.

If you recall our discussions from chapters 7 and 8, a many-to-many relationship exists between Category and Item entities, with CATEGORIES_ITEMS as the intersection table. This means the persistence provider will generate the following SQL statement:

SELECT c.CATEGORY_ID, c.CATEGORY_NAME, c.CREATE_DATE, c.CREATED_BY, c.PARENT_ID FROM CATEGORIES c WHERE ( (SELECT COUNT(*) FROM CATEGORIES_ITEMS ci, ITEMS i WHERE ( (ci.CATEGORY_ID = c.CATEGORY_ID) AND (i.ITEM_ID = ci.ITEM_ID))) = 0)

Summary

From this generated SQL, you can see that the persistence provider uses a subquery to retrieve the number of associated items for a category by using the COUNT group function, and then compares the result with 0. This means that if no items are found, the collection must be empty, and the IS EMPTY clause is true. Have you ever had an occasion to detect the presence of a single value in a collection Sure you have! In JPQL you can use the MEMBER OF operator for just that purpose. Let s take a look at how it works.

Checking for the existence of an entity in a collection You can use the MEMBER OF operator to test whether an identifier variable, a singlevalue path expression, or an input parameter exists in a collection-value path expression. Here is the syntax for the MEMBER OF operator:

The OF and NOT keywords are optional and can be omitted. Here is an example of using an input parameter with MEMBER OF:

This chapter ends with a bonus section that shows you one possible approach for integrating Web services and message queuing (with MSMQ). We should quickly point out that we are not going to show you how to create an MSMQ custom transport channel. Instead, we are going to discuss how to configure a message queue and then access it from a Web service using the System.Messaging namespace. WSE 3.0 does not implement reliable messaging, nor does it provide any kind of support for managing message delivery. If you want to implement this capability today, you will need to custom build the support infrastructure using MSMQ (or another middleware product such as MQSeries).

This condition will return true if the entity instance passed (as:item) in the query exists in the collection of c.items for a particular Category c.

This chapter has discussed how you can implement special member functions for managed types. Even though many special member functions of managed types have similar counterparts in the native world, there are subtle but significant differences. At construction time, virtual methods of managed objects are dispatched to overridden implementations even though this can cause access to parts of an object that are not yet initialized. To reduce this danger, constructors for fields of managed types are called before the base class constructor is called. There are also differences regarding object destruction. The GC is responsible for reclaiming memory. Since its timing is nondeterministic, cleanup of the resources held by an object is decoupled from memory cleanup. To implement code that cleans up an object s resources in a deterministic manner, C++/CLI allows you to implement a destructor. This destructor is

10.3.4 Working with JPQL functions JPQL provides several built-in functions for performing string or arithmetic operations. These functions can be used either in the WHERE or HAVING clause of a JPQL statement. You ll learn more about the HAVING clause when we cover aggregate functions later in this chapter.

String functions You can use string functions in the SELECT clause of a JPQL query; table 10.10 lists all string functions supported by JPQL. These functions are only meant to be used to filter the results of the query. You have to use the functions available in the Java language if you want to perform any string manipulations on your data. The primary reason is that in-memory string manipulation in your application will be much faster than doing the manipulation in the database.