With a factory pattern write database access classes. When creating an interface for external use by DBHelperFactory IDBHelper object, and MySqlDBHelper inherited DBHelper, DBHelper has achieved IDBHelper. DBHelper is an abstract class.

工厂模式的数据库访问类（支持各种数据库）\ClassDiagram（类关系图）.JPG
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工厂模式的数据库访问类（支持各种数据库）
说明.txt

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