Most articles are more or less talking about the three-tier structure. Presentation layer, business layer, data layer. Business layer again subdivided into the appearance of service layer, the main business services, library services and database layer. Today, the main bar to talk about the business layer. Take the simplest example. Client access to data.

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最新三层架构设计源码\DELPHI三层架构设计方案.doc
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最新三层架构设计源码

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