总结

xiaoxiao2021-02-28  92

  为解决业务代码和数据访问代码的紧藕合给修改和维护代码带来

                            的不便,推荐使用DAO模式封装JDBC

 

                                                                DAO接口

                                                                DAO实现类

                                DAC模式组成部分:实体类

                                                                 数据库连接和关闭工具类

        

       

                                 DAO模式的优势:         隔离了数据访问代码和业务逻辑代码

DAO模式                                                         隔离了不同数据库实现

 

 

                                                                                                   优势:能够脱离程序本身去修改相关的变量设置

                                使用Properties类读取配置文件:              Properties配置文件:由键-值对组成

                                                                                                   读取配置文件:使用Properties类相应方法

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