1.在springboot项目下的UsersServiceImpl如果去掉@Autowired注解usersMapper变红,不加@Autowired注解 usersMapper为null
2.
@Service
public class UsersServiceImpl implements UsersService {
@Autowired
private UsersMapper usersMapper;
@Override
public void addUser(Users users) {
this.usersMapper.insertUser(users);
}
@Override
public List<Users> findUserAll() {
return this.usersMapper.selectUsersAll();
}
}