pkAssistant/src/main/java/vvpkassistant/User/mapper/UserDao.java

package vvpkassistant.User.mapper;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import org.apache.ibatis.annotations.Mapper;
import vvpkassistant.User.model.UserModel;

@Mapper
public interface UserDao extends BaseMapper<UserModel> {

    // 原子扣减积分：当 points >= cost 时扣减，返回受影响行数(1=成功，0=积分不足/用户不存在)
    default int decreasePointsIfEnough(Integer userId, int cost) {
        return update(null, Wrappers.<UserModel>lambdaUpdate()
                .eq(UserModel::getId, userId)
                .ge(UserModel::getPoints, cost)
                .setSql("points = points - " + cost));
    }

    // 原子增加积分：返回受影响行数(1=成功，0=用户不存在)
    default int increasePoints(Integer userId, int amount) {
        return update(null, Wrappers.<UserModel>lambdaUpdate()
                .eq(UserModel::getId, userId)
                .setSql("points = points + " + amount));
    }

    // 根据用户的手机号查询用户
    default UserModel queryWithPhoneNumber(String phoneNumber) {
        return selectOne(Wrappers.<UserModel>lambdaQuery()
                .eq(UserModel::getMobile, phoneNumber));
    }

}