By Rockford Lhotka
Popular convention speaker "Rocky" Lhotka indicates tips to use the framework to create a pattern program and demonstrates how easy it is to write home windows, internet, and net companies interfaces for purposes according to it.
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Additional resources for Expert VB 2005 Business Objects
Data Access Acts as an intermediary between the business logic and data management. NET), databases, and data structures. Data Storage and Management Physically creates, retrieves, updates, and deletes data in a persistent data store. Everything I’ve talked about to this point is part of a logical architecture. Now it’s time to move on and see how it can be applied in various physical configurations. Applying the Logical Architecture Given this 5-layer logical architecture, it should be possible to configure it into one, two, three, four, or five physical tiers in order to gain performance, scalability, security, or fault tolerance to various degrees, and in various combinations.
NET deployment technologies. NET Framework supports all three of the mechanisms just discussed, so you can choose to create your objects as local, anchored, or mobile, depending on the requirements of your design. As you might guess, there are good reasons for each approach. Windows Forms and Web Forms objects are all local—they’re inaccessible from outside the processes in which they were created. The assumption is that other applications shouldn’t be allowed to just reach into your program and manipulate your UI objects.
It is enough to put the data access code in clearly defined data access methods. As long as no data access code exists outside those methods, separation is maintained. qxd 4/7/06 2:03 PM Page 33 CHAPTER 1 DISTRIBUTED ARCHITECTURE Architectures and Frameworks The discussion so far has focused mainly on architectures: logical architectures that define the separation of responsibilities in an application, and physical architectures that define the locations where the logical layers will run in various configurations.
Expert VB 2005 Business Objects by Rockford Lhotka