By Rockford Lhotka
ISBN-10: 1590591453
ISBN-13: 9781590591451
This article exhibits the right way to construct an n-tier structure in .NET, layout a dispensed object-oriented structure with VB .NET, and construct a reusable framework to enforce a dispensed object-oriented structure.
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Extra info for Expert one-on-one Visual Basic .NET business objects
Sample text
A classic example of where object models and relational models often differ is in a many-to-many relational model. In such a model – and we'll take the example here of physicians and services – we have three tables, reflecting the fact that a physician provides many services, and any given service may be provided by many physicians: This relationship is constructed by creating a link (or bridge) table that contains keys from both the Physician and Service tables, providing a bi-directional, many-to-many link between the two entities.
If we implement it using an anchored object, it will be guaranteed to run on our application server. Then we can call methods on the data access tier, passing our business object as a parameter. Since the business object is unanchored, it will physically move to the machine where the data access tier is running. This gives us a way to get the business object to the right machine before the object attempts to interact with the database. Note We'll discuss this in much more detail in Chapter 2, when we lay out the specific design of the distributed object framework, and in Chapter 5, as we build the data access tier itself.
Keep in mind, though, that this particular decision is fairly central to the overall architecture of the framework we're building, so choosing another option will likely result in dramatic changes throughout the framework. To make this as clear as possible, the following discussion will assume that we have a physical n-tier configuration, where the client or web server is interacting with a separate application server, which in turn interacts with the database. The following diagram illustrates the Web Forms (on the left) and Windows Forms (on the right) versions of such an architecture: Chapter 2: Framework Design 41 42 Chapter 2: Framework Design While not all applications will run in such configurations, we'll find it much easier to discuss object creation, retrieval, and updating in this context.
Expert one-on-one Visual Basic .NET business objects by Rockford Lhotka
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