将@Mapper添加到接口类时，将在编译后生成相应的接口实现类
@mapperpublicinterfaceuserdao {//代码}如果由于空闲而很麻烦，如果不想为每个mapper添加@ mapper注释，请在启动类中添加@MapperScan注释，然后生成实体类
@ springbootapplication @ mappers can (cn.wenham.Dao ) publicclasspringbootmybatisdemoapplication { publicstaticvoidmmoid } }公共接口用户{//代码}