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Stateless session beans can perform more complex functions as well Suppose the same company has a page on its web site where a user can request a product catalog by filling in the contents of a small form When the form is filled in and the user clicks the Send button, the browser sends the data from the form to the web server, which again hands off the request to an application server This time, a different method of the session bean is invoked, and receives the data from the form as parameters The session bean can use JDBC to send a SQL INSERT statement to a database table holding pending catalog requests In each of these examples, all of the information that the session bean needs to carry out its task is passed to it with the method invocation.

The disadvantage of compiled stored procedures is that the exact technique used to carry out the stored procedure is fixed when the procedure is compiled Suppose, for example, that a stored procedure is created and compiled soon after a database is first created, and later some useful indexes are defined on the data The compiled queries in the stored procedure won t take advantage of these indexes, and as a result, they may run much more slowly than if they were recompiled To deal with stale compiled procedures, some DBMS brands automatically mark any compiled procedures that may be affected by subsequent database changes as being in need of recompilation The next time the procedure is called, the DBMS notices the mark and recompiles the procedure before executing it.

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When the bean has completed its task, the information is not needed anymore The next invocation again receives all of the information it needs with the next invocation, so there is no need to carry over status information Even more important, the database activity on each invocation is completely independent from every other invocation No database transaction spans multiple method invocations..

Normally, this approach provides the best of both worlds the performance benefits of precompilation while keeping the compiled procedure up to date Its disadvantage is that it can yield unpredictable stored procedure execution times When no recompile is necessary, the stored procedure may execute quickly; when a recompile is activated, it may produce a significant delay; and in most cases, the recompile delay is much longer than the disadvantage of using the old compiled version To determine the stored procedure compilation capabilities of a particular DBMS, you can examine its CREATE PROCEDURE and EXECUTE PROCEDURE statement options, or look for other procedure management statements such as ALTER PROCEDURE..

Many web interactions can t live with the limitations imposed by stateless session beans. Consider a more complex web-based form that spans four pages. As the user fills out each page and sends it to the web site, the session bean must accumulate the information and retain it across the four page clicks until all of the data is ready to be captured into a database. The need to retain information across method invocations calls for a stateful session bean. Another example in which a stateful session bean is appropriate is a commercial web site where a user shops online and accumulates a list of items to be purchased in

20:

Figure 22-4.

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DBMS brands that support stored procedures sometimes provide built-in, system-defined stored procedures to automate database processing or management functions. Sybase SQL Server pioneered this use of system stored procedures. Today, hundreds of Transact-SQL system stored procedures provide functions such as managing users, database roles, job execution, distributed servers, replication, and others. Most Transact-SQL system procedures follow this naming convention: sp_add_something Adds a new object (user, server, replica, etc.) sp_drop_something sp_help_something Drops an existing object Gets information about an object or objects

an online shopping cart. After 40 or 50 clicks through the web site, the user may have accumulated five or six items in the shopping cart. If the user then clicks a button requesting display of the current shopping cart contents, those contents are probably most easily maintained as session bean state. In both of these examples, the session bean requires continuity of database access to effectively accomplish its tasks. Figure 22-5 shows the pattern, and the contrast to the pattern of interactions in Figure 22-4. Even if the bean can be implemented without instance variables (for example, by storing all of its state information in a back-end database), it needs one continuous database session to carry out its database access. The client-side API for the DBMS maintains this session, and the API itself will need to maintain session-state information across session bean method invocations.

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