- 1.创建映射数据库的实体类entity包里的Book
- 2.写接口，按照需求编写接口 mapper -- BookMapper
- 3.去编写BookMapper.xml - resources BookMapper.xml
- 4.编写service层接口，impl service层接口的实现类
- ps:在service实现类上加@service注解 添加事务注解
- serviceImpl调用dao层进行资源注入
- @AutoWired
- private BookMapper bookMapper;
- 5.编写controller层
- 作用：调用service层 service --- mapper
- 接受浏览器请求的参数
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