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The TxCheckArgs parameter precondition aspect introduces the checkAccountArgs method in TxControllerBean through an intertype declaration (line 29). It also defines two advice codes applied on the prototypes that correspond to an account operation (line 10), and that correspond to an account transfer (line 19).

Ordering of rows is an expensive operation in the database, especially when a lot of rows are retrieved. Therefore, it doesn t always make sense to retrieve the entities in an ordered collection. Unless another sort order is required, let s set the default order using a JPQL query as follows:

The database will try to order the matching records by BID_PRICE. We expect your DBA will agree that adding an index on BID_PRICE for the BIDS table will improve query performance.

The result of this tag is the declaration of the finder method into the home and local home interface of the EJB. As long as you are generating the home or local home interface, you don t need to make any changes to the build.xml file.

Using functions in the WHERE clause of JPQL You can use JPQL functions in the WHERE clause of a query. For example, you can create a JPQL query as follows:

SELECT u FROM User u WHERE upper(u.firstName) = 1

As stated previously, the second set of preconditions correspond to the business concerns and are part of the business rules set. We call them business preconditions. Note that, in general, preconditions can also be completed with postconditions in order to implement, for instance, potential invariants. For more details on this generic issue, you can refer to 9. In our current case study, externalizing the preconditions within an aspect is useful for three principal reasons: These preconditions may evolve with time. We can imagine, for instance, that the precondition changes and ensures that a minimum amount is necessary for a withdrawal in order for it to accept a negative balance. These preconditions can be applied depending on the context. We can imagine that we do not want to apply the preconditions if the withdrawal operation is executed within another service that would already have applied its own preconditions. In this case, the use of aspects, particularly the AspectJ cflows, is well suited to easily implement contextual tests.

Entity beans often must declare specific select methods allowing you to select collections or specific entities from the persistent store. Select methods must be described in the deployment XML for a bean. As with all manual tasks, editing the XML descriptor is error prone and tedious.

This statement will be translated to SQL as follows:

SELECT * FROM USERS WHERE UPPER(FIRST_NAME) = 1

To generate the XML for select methods, declare the abstract select methods in your bean class and identify them with the @ejb.select tag in their JavaDoc comments. Use the tag attribute query to specify the EJB-QL statement for the method. For instance, examine the ItemBean in listing 2.17.

Remember that when you use a function in the WHERE clause, the database won t use an indexed scan, even if an index exists on the FIRST_NAME column. Because of this, you should avoid using functions in the WHERE clause. Some databases support creating function-based indexes and you can use them if needed. Just be aware that the function-based indexes may not be portable. For our example, you could consider storing the names in uppercase instead of using the JPQL Upper function. Reducing round-trips to the database If your query retrieves a lot of entities, that means a lot of rows are retrieved from the database, and this translates into multiple round-trips between your application and the database. Some JDBC drivers provide facilities to reduce the number of round-trips to the database by setting the number of rows to be prefetched in the middle tier while a result set is being populated. This improves performance of queries that retrieve a large number of rows. You can pass the JDBC fetch size as a vendor-specific @QueryHint in either a named query or dynamic query as follows. If you re using TopLink or Hibernate, you can use toplink.jdbc.fetch-size or org.hibernate.fetchSize, respectively. The following code snippet demonstrates using @QueryHint for Hibernate: