Patterns for Layered Object-Oriented Applications
msra
摘要
Three-layered architectures (presentation, business and persistence levels) are sometimes recommended when developing object-oriented applications. Using the increasingly popular fourth generation languages, however, layering is difficult: business rules are usually embedded in user interfaces, which may also directly access databases. In this paper, we present three patterns useful in the construction of object oriented applications accessing relational databases via fourth generation languages.
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