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我自己开发的一个数据库访问的三层框架，采用了集中常用的模式进行开发。应该能满足最基本的要求，对初学者帮助挺大的。-I have developed a three-tier framework for database access, using a centralized model commonly used for development. Should be able to meet the minimum requirements, for beginners to help Tingda s.
