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A session bean will typically access a database in a series of one or more JDBC calls on behalf of the user represented by the bean. An application server classifies session beans into two categories, depending on how the bean manages state: I Stateless session bean. This type of bean does not maintain any status information across method invocations. It carries out its actions on behalf of one user at a time, and one request at a time. Each request to the bean is independent of the last. With this restriction, every invocation of the bean must carry with it (in the form of the parameters passed with the invocation) all of the information needed to carry out the request. I Stateful session bean. This type of bean maintains status information across method invocations. The bean needs to remember information from its previous invocations (its state) to carry out the tasks requested by later invocations. It uses private instance variables to hold the information.

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Figure 22-3.

Stored procedures offer several advantages, both for database users and database administrators, including Runtime performance Many DBMS brands compile stored procedures (either automatically or at the user s request) into an internal representation that can be executed very efficiently by the DBMS at runtime Executing a precompiled stored procedure can be much faster than running the equivalent SQL statements through the PREPARE/EXECUTE process Reusability Once a stored procedure has been defined for a specific function, that procedure may be called from many different application programs that need to perform the function, permitting very easy reuse of application logic and reducing the risk of application programmer error Reduced network traffic In a client/server configuration, sending a stored procedure call across the network and receiving the results in a reply message generates much less network traffic than using a network round trip for each individual SQL statement.

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The next two sessions show examples of application tasks that are most easily implemented as each type of session bean. You specify whether a session bean is stateless or stateful in the deployment descriptor for the bean, which contains information supplied to the application server on which the bean is deployed. An application server on a busy web site can easily have more session beans and other EJBs in use than it has main memory available to store them. In this situation, the application server will keep a limited number of session bean instances active in its main memory. If a user associated with a currently inactive session bean becomes active (i.e., one of his or her web site clicks must be processed), the application server chooses another instance of the same bean class and passivates it that is, it saves the values of any instance variables defined for the bean and then reuses the bean to serve the user session needing activation. Whether a session bean is stateful or stateless has a significant impact on this passivation and activation. Since a stateless session bean does not need its status preserved across method invocations, the application server does not need to save its instance variable values when it passivates the bean, and does not need to restore instance variable values when it reactivates the bean. But for a stateful session bean, the application server needs to copy its instance value variables to persistent storage

They are also frequently used to store money amounts Floating point numbers Columns with this data type are used to store scientific numbers that can be calculated approximately, such as weights and distances Floating point numbers can represent a larger range of values than decimal numbers but can produce round-off errors in computations Fixed-length character strings Columns holding this type of data typically store names of people and companies, addresses, descriptions, and so on Variable-length character strings This data type allows a column to store character strings that vary in length from row to row, up to some maximum length (The SQL1 standard permitted only fixed-length character strings, which are easier for the DBMS to process but can waste considerable space) Money amounts Many SQL products support a MONEY or CURRENCY type, which is usually stored as a decimal or floating point number.

This can improve overall system performance considerably in a network with heavy traffic or one that has lower-speed connections Security In most DBMS brands, the stored procedure is treated as a trusted entity within the database and executes with its own privileges The user executing the stored procedure needs to have only permission to execute it, not permission on the underlying tables that the stored procedure may access or modify Thus, the stored procedure allows the database administrator to maintain tighter security on the underlying data, while still giving individual users the specific data update or data access capabilities they require Encapsulation Stored procedures are a way to achieve one of the core objectives of object-oriented programming the encapsulation of data values, structures, and access within a set of very limited, well-defined external interfaces.

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