10.3

package com.example.demo11.Service.Impl;

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.example.demo11.Mapper.AttendanceMapper;
import com.example.demo11.Mapper.DeviceDataMapper;
import com.example.demo11.Service.AttendanceService;
import com.example.demo11.Service.DeviceDataService;
import com.example.demo11.entity.Attendance;
import com.example.demo11.entity.DeviceData;
import org.springframework.stereotype.Service;

@Service
public class DeviceDataServiceImpl extends ServiceImpl<DeviceDataMapper, DeviceData> implements DeviceDataService {

}

package com.example.demo11.Service.Impl;

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.example.demo11.Mapper.UserMapper;
import com.example.demo11.Service.UserService;
import com.example.demo11.entity.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements UserService {
    @Autowired
    private UserMapper userMapper;
    @Override
    public User login(String userId) {

        return userMapper.selectByUsername(userId);

    }
}