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In object terminology, stored procedures can be the methods through which the objects in the underlying RDBMS are exclusively manipulated To fully attain the object-oriented approach, all direct access to the underlying data via SQL must be disallowed through the RDBMS security system, leaving only the stored procedures for database access In practice, few if any production relational databases operate in this restricted manner Simplicity of access In a large enterprise database, a collection of stored procedures may be the main way in which application programs access the database The stored procedures form a well-defined set of transactions and queries that applications can perform on the database For most application programmers, a call to a simple, predefined function that checks an account balance, given a customer number, or one that adds an order, given a customer number, quantity, and product-id, is easier to understand than the corresponding SQL statements..

Part VI:

(a disk file or a database) when it passivates the bean, and then restore those values when it reactivates the bean. Thus, stateful session beans can significantly diminish the performance and throughput of an application server on a busy site. Stateless beans are preferable for performance, but many applications are difficult or impossible to implement without using stateful beans.

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Business rules enforcement The conditional processing capabilities of stored procedures are often used to place business rules into the database. For example, a stored procedure used to add an order to the database might contain logic to check the credit of the customer placing the order and check whether there is enough inventory on hand to fill the order, and reject the order if these conditions cannot be met. A large company could quite easily have several different ways in which orders are taken and entered into the corporate database one program for use by direct salespeople, one for people in the telesales department, another that accepts orders placed via the Web, and so on. Each of these would typically have its own orderacceptance program, usually written by different programmers at different times. But if all of the programs are forced to use the same stored procedure to add an order, the company can be assured that the business rules in that procedure are being uniformly enforced, no matter where the order originated.

Figure 22-4 shows a simple example of an application that can easily be handled with stateless session bean database access A page on a web site displays the current price of a company s stock when the page is displayed The page can t be static, since the displayed price will change minute by minute So when the user s browser requests the page, the web server hands off the request to an application server, which eventually invokes a method of a session bean The session bean can use JDBC to send a SQL SELECT statement to a database of current stock prices, and receives back the answer as one line of query results The session bean reformats the stock quote as a fragment of a web page, and passes it back to the web server for display to the user.

Having a distinct money type allows the DBMS to properly format money amounts when they are displayed..

Different DBMS brands vary in the way they actually implement stored procedures In several brands, the stored procedure text is stored within the database and is interpreted when the procedure is executed This has the advantage of creating a very flexible stored procedure language, but it creates significant runtime overhead for complex stored procedures The DBMS must read the statements that make up the stored procedure at runtime, parse and analyze them, and determine what to do on the fly Because of the overhead in the interpreted approach, some DBMS brands compile stored procedures into an intermediate form that is much more efficient to execute Compilation may be automatic when the stored procedure is created, or the DBMS may provide the ability for the user to request stored procedure compilation.

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