Developing Enterprise Applications -An Impurist's View by Paul Tindall

By Paul Tindall

Constructing company functions utilizing utilizing VB6, MTS, SQLServer and IIS- An Impurist's View indicates software program architects, builders and executives easy methods to follow either universal and lesser recognized styles and framework elements to create versatile, worldwide firm purposes utilizing Microsoft's instruments and applied sciences. alongside the way in which, you will discover tricks, warnings and implementation suggestions that have been built after many overdue nights of scouring via documentation to discover the answer to specific quirks. tips on how to handle the architectural reasoning in the back of each one framework part choice and spot the tradeoff judgements that has to be made to accomplish the final word target of long term enterprise good fortune.

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Because of encapsulation, you only need to modify the contents of the BondPrice method and nothing more. Better yet, because you have not changed the calling convention, the applications using the CBond class are none the wiser that a change occurred. Polymorphism Polymorphism is another standard feature of object-oriented programming. Fundamentally, polymorphism means the capability to define similar properties and methods on dissimilar classes. In essence, we define a common interface on a set of classes such that a calling application can use these classes with a standard set of conventions.

For example: Set OPerson = New CPerson Component-Based Development With some object-orientation fundamentals behind us, we turn our discussion to component-based development (CBD). Many people feel that objects and components are synonymous, when in fact, they are more like siblings. Objects can exist without components, and vice-versa. A component is a reusable, self-contained body of functionality that we can use across a broad application base. Imagine an application suite that has a core piece of functionality contained in an includable source code module.

If the classes meet these requirements, we can simplify the coding of the object retrieval process into a single function call on the application. This not only leads to code that is easier to maintain over the life of the application, but also makes extending the application to support new class types much simpler. The late binding technique of Visual Basic presents us with some concerns. Because late binding performs type checking at runtime, some errors might escape early testing or even propagate into the production application.

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