1、 之前示例中将数据库驱动、连接地址、用户名和密码直接写在类里，导致代码耦合度高。一旦数据库更换或类型改变，就必须修改源码，维护和扩展极为不便。 2、 将数据库的驱动、连接地址、用户名及密码存入配置文件，程序通过读取该文件获取信息。

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