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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.

22:

Figure 22-5.

MEDIUMBLOB, MEDIUMTEXT A binary or character string with a maximum length of 16,777,215 bytes. LONGBLOB, LONGTEXT A binary or character with a maximum length of 4,294,967,295 bytes. ENUM An enumerated list, which is a string column that may contain one of the values speci ed in the list of values in the column de nition. SET A set list, which is a string column that may contain any of a number of values speci ed in the list of values in the column de nition.

It s possible to implement complete, sophisticated web site applications using session beans deployed on a J2EE application server. However, programming an application using session beans tends to produce more procedural, and less object-oriented code. The object-oriented philosophy is to have object classes (in this case, EJB classes) represent real-world entities, such as customers or offices, and object instances represent individual customers or offices. But session beans don t represent any of those entities; they represent currently active user sessions. When database interaction is handled directly by session beans, the representation of real-world entities is basically left in the database; it doesn t have an object counterpart.

Entity beans provide the object counterpart for real-world entities and the rows in a database that represent them Entity bean classes embody customers and offices; individual entity bean instances represent individual customers and individual offices Other objects (such as session beans) within the application server can interact with customers and offices using object-oriented techniques, by invoking the methods of the entity beans that represent them To maintain this object-oriented model, there must be very close cooperation between the entity-bean representations of entities and their database representations If a session bean invokes a customer entity bean method that changes a customer s credit limit, that change must be reflected in the database, so that an order-processing application using the database will use the new limit.

The roof seems an obvious place to want to mount your solar heating panels. After all, you have a large area which is currently unutilized just waiting for some clean green energy generation! First of all, you should consider the structural integrity of your roof and how strong it is. Remember, the roof will not only need to support the weight of the solar heating panel and all of the associated paraphernalia, but might also need to support your weight as you install it. You will also need to consider the orientation of your roof and whether it is positioned in such a manner that it will receive optimal solar gain. If you are in the northern hemisphere, you will want a roof which faces as near to due south as possible. If your roof does not face directly due south, there will be some loss of efficiency which is proportional to the angle of deviation from due south. If you live in the southern hemisphere, the reverse is true you want a roof that faces due north in order to catch the best of the sun s rays.