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This facility means that you can control transactional behavior at the method level rather than at the class level. This is a powerful feature because it means you can do your data retrieval outside of a transaction to get optimal performance and still do updates within the context of a transaction to ensure data integrity. The server-side data portal examines the appropriate method on the business object before it routes the call to the business object itself. If the method is marked with <Transactional (TransactionalTypes.TransactionScope)>, the call is routed to a TransactionalDataPortal object that is configured to run within a System.Transactions.TransactionScope. A TransactionScope is powerful because it provides a lightweight transactional wrapper in the case that you are updating a single database, but it automatically upgrades to a distributed transaction if you are updating multiple databases. In short, you get the benefits of COM+ distributed transactions if you need them, but you don t pay the performance penalty if you don t need them. If the method is marked as <Transactional(TransactionalTypes.EnterpriseServices)>, the call is routed to a ServicedDataPortal object that is configured to require a COM+ distributed transaction. The ServicedDataPortal then calls the SimpleDataPortal, which delegates the call to your business object, but only after it is running within a distributed transaction. Either way, your code is transactionally protected. If the method doesn t have the attribute or is marked as <Transactional(TransactionalTypes. Manual)>, the call is routed directly to the SimpleDataPortal, as illustrated in Figure 2-15.

This consistent read is provided to all statements so that an INSERT such as the following is predictable as well: insert into t select * from t; The INSERT statement will be provided a read-consistent view of T It will not see the rows that it just inserted; rather, it will only insert the rows that existed at the time the SELECT began Some databases won t even permit recursive statements such as the preceding because they can t tell how many rows might actually be inserted So, if you are used to the way other databases work with respect to query consistency and concurrency, or you never had to grapple with such concepts (ie, you have no real database experience), you can now see how understanding how this works will be important to you.

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In order to maximize Oracle s potential, and to implement correct code, you need to understand these issues as they pertain to Oracle not how they are implemented in other databases..

By default, the server-side data portal components route calls to methods of an instance of the business object itself. In other words, the business object becomes responsible for initializing itself with new data, loading itself with existing data, and inserting, updating, or deleting its data. That approach is very simple and efficient but may not offer the best separation between business and data access logic. The ObjectFactory attribute and ObjectFactory base class provide an alternative, where the data portal creates an instance of an object factory class and interacts with that factory object, instead of the business object. In the default model, the data portal does a lot of work on behalf of the business developer. It creates instances of the business object, manages the object s state values, and generally shepherds the object through the data persistence process.

By now, you might be able to see where I m going in this section I have made references above to other databases and how features are implemented differently in each With the exception of some read-only applications, it is my contention that building a wholly database-independent application that is highly scalable is extremely hard it is, in fact, quite impossible unless you know exactly how each database works in great detail And, if you knew how each database worked in great detail, you d understand that database independence is not something you really want to achieve (a very circular argument!) To illustrate, let s revisit our initial resource scheduler example (prior to adding the FOR UPDATE clause) Let s say this application had been developed on a database with an entirely different locking/concurrency model from that of Oracle.

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