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While the code in the solution is lengthy, it is pretty straightforward. There are a couple of key points to make about this session bean. First, in order to predict the number of data pages, the session bean requires you to pass in an SQL statement that returns the row count of the query that will be paginated. Second, the result set created by executing the query must be scrollable. This is done by creating the Statement object with the following line of code:

@Target({TYPE, METHOD, FIELD}) @Retention(RUNTIME) public @interface TableGenerator { Unique generator name String name(); String table() default "";

Table catalog String catalog() default ""; String schema() default ""; Table schema String pkColumnName() default ""; String valueColumnName() default ""; String pkColumnValue() default ""; int initialValue() default 0; Amount to increment by int allocationSize() default 50; UniqueConstraint[] uniqueConstraints() default {};

stmt = con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_UPDATABLE);

javax.persistence.SequenceGenerator Denotes a generator that may be used for automatic key generation using a database sequence.

Java Transaction API (JTA) defines a set of interfaces and mechanisms for using distributed transactions. A transaction is distributed when several data sources are involved. In general, data sources are located on different servers, but this is not mandatory. JTA can also be used for only one data source. Within J2EE, JTA is typically used to make a session EJB facade service transactional. The reference banking application only has one data source: a PointBase database. It is interesting to evaluate possible data distributions. For example, accounts and transactions could be stored in two distinct databases in order to balance the load and the data volume. In addition, it is useful for the system administration since transactions can call for a different maintenance process than the accounts. In this case, the use of JTA and an architecture that supports distribution is important. In short, JTA relies on the definition of three communication interfaces between three main entities: the application, the transaction manager, and the transactional resources. In the context of an application server, JTA defines an interface between the application server and the transaction manager. This interface permits the notification of the manager for operations occurring on EJBs within the transactions. It also allows the client to access an automatically and transparently transmitted transactional context, which is accessible from any EJB participating in a transaction. Within a transaction, a participating EJB can access through the transactional context an object that represents the transaction: an instance of javax. transaction.UserTransaction.

@Target({TYPE, METHOD, FIELD}) @Retention(RUNTIME) public @interface SequenceGenerator { Unique generator name String name(); String sequenceName() default ""; Name of database sequence int initialValue() default 1; int allocationSize() default 50; Amount to increment by }

A final point to remember is that foreign keys can refer back to the primary key of the same table it resides in. There is nothing stopping a @JoinColumn annotation from specifying such a relationship. For example, the many-to-one relationship between subcategories and parent categories could be expressed as shown in listing 8.10.

Once the actual result set is acquired, the next() and previous() methods just keep track of the database cursor as they scroll through the result set. The only tricky part is being careful with the beginning and end indexes of the result set. Both methods use the total number of rows, the page size constant, and the return value of the getRow() method to determine how much data to return. The getRow() method of the ResultSet object returns the index number of the current row selected. Using a page-able mechanism like this one allows your clients to build pageable tables in their displays. Users can then navigate forward and backward through the result set as needed. Another convenience method you could easily add to this bean is a jump() method. A jump method could loop through successive calls of next() or previous() to reach a certain page of data. Since the bean knows the total number of pages, this would be a simple exercise.

@Entity @Table(name="CATEGORIES") public class Category implements Serializable { @Id @Column(name="CATEGORY_ID") protected Long categoryId; ... @ManyToOne @JoinColumn(name="PARENT_ID", referencedColumnName="CATEGORY_ID") Category parentCategory; ...

The code in Listing 11-20 is a rewrite of the transfer function of TxControllerBean so that it ensures transactional properties by using JTA. Listing 11-20. Manual Control of Transactions with JTA 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 // a modified version of aop.j2ee.business.session.TxControllerBean to use JTA [...] javax.transaction.UserTransaction ut; public void transferFunds(BigDecimal amount,String descr, String fromAccountId,String toAccountId) throws InvalidParameterException,AccountNotFoundException, InsufficientFundsException,InsufficientCreditException { Account fromAccount; Account toAccount; fromAccount= checkAccountArgsAndResolve(amount, descr, fromAccountId); toAccount= checkAccountArgsAndResolve(amount, descr, toAccountId); ut= context.getUserTransaction();