WF4.0 Combat (Eight): To achieve a set of graphical data access layer

Now, an estimated three-tier architecture is still widely used by programmers. The first list of these three layers, is not afraid that we do not know these three layers, but the following needs,:).

1. Data Access Layer

2. Business Logic Layer

3, the presentation layer

And there's the solid layer of data interchange.

Many programmers use code generators, and neither do I. A generic code generator helps programmers generate data access and business logic tiers. Because the presentation layer is ever-changing, it is difficult to generate it through the generator. When the fixed-generated business layer does not meet the requirements. It's often necessary to manually modify the code, and this article teaches you how to customize the business logic of the process through a graphical interface without having to modify your code.

Let's take a look at my data access Layer screenshot:

Data Access Layer:

Business logic for ordering products: