Description: Three-tier architecture and design patterns (abstract factory implementation)
1. The three layer architecture implementation, the presentation layer (WebUI) is separated from the data access layer (DAL), using the business logic for processing (BLL), avoids expose data information to the presentation layer, thus providing the performance of the program, using the business logic processing and presentation layer to interact,
The presentation layer needs, through the business logic processing, convey information to the data access layer to carry on the processing, the processed information from the business logic and back to the presentation layer, in the whole process, business logic layer played a bridge role in the middle. In the business logic layer, no
The implementation of AD0.net and SQL statements appears.
2. The abstract factory design pattern, increase the consistency between programs, ensure that the database change, will not affect the program change, between any of the changes between layers, will not affect the change of is a program, just change one of the layers.
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