OnlineJudge/src/main/java/com/example/onlinejudge/mapper/UserMapper.java

package com.example.onlinejudge.mapper;

import com.example.onlinejudge.model.entity.User;
import org.apache.ibatis.annotations.Mapper;

@Mapper
public interface UserMapper {
    User selectUserById(Integer id);
    User selectUserByUsernameAndPassword(String username, String password);
}