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By Rockford Lhotka
Popular convention speaker "Rocky" Lhotka exhibits tips on how to use the framework to create a pattern software and demonstrates how easy it is to write home windows, net, and net companies interfaces for functions in response to it.
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Extra resources for Expert VB 2005 Business Objects
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NET’s ability to move objects around the network automatically, it’s now time to discuss business objects in more detail. I will discuss exactly what they are and how they can help you to centralize the business logic pertaining to your data. The primary goal when designing any kind of software object is to create an abstract representation of some entity or concept. NET, for example, a DataTable object represents a tabular set of data. DataTables provide an abstract and consistent mechanism by which you can work with any tabular data.
As a side effect, adding more physical tiers also reduces performance for a single user, so it’s not something that should be done lightly. Logically defining data access as a separate layer enforces a separation between the business logic and any interaction with a database (or any other data source). This separation provides the flexibility to choose later whether to run the data access code on the same machine as the business logic, or on a separate machine. It also makes it much easier to change data sources without affecting the application.
This is true of all mobile objects, including business objects. You need to be careful in your application design in order to avoid retrieving very large sets of data. qxd 30 4/7/06 2:03 PM Page 30 CHAPTER 1 DISTRIBUTED ARCHITECTURE Objects that can move from process to process or from machine to machine are mobile objects. Examples of mobile objects include the DataSet and the business objects created in this book. Mobile objects aren’t stuck in a single place, but can move to where they’re most needed.