P1-9:编写mapper层
新建包
新建mapper类
实现接口,添加注解
1 package com.dszh.demo2.mapper; 2 import com.baomidou.mybatisplus.core.mapper.BaseMapper; 3 import com.dszh.demo2.entity.User; 4 import org.springframework.stereotype.Repository; 5 6 @Repository 7 public interface UserMapper extends BaseMapper<User> { 8 9 }