JDBC连接数据库代码，采用设计模式中的工厂模式和策略模式进行设计，对于需要连接Mysql更是提供了很好的框架性，隐藏了数据库操作的复杂性-JDBC database connection code, design patterns factory pattern and strategy pattern design, for it is necessary to connect Mysql provides a good framework, hiding the complexity of database operations