Question

我正在为即将到来的世界杯做预测游戏。

这些是我的表格：

CREATE TABLE `users` (
  `id` int(11) unsigned NOT NULL AUTO_INCREMENT,
  `first_name` varchar(255) COLLATE utf8_bin NOT NULL DEFAULT '',
  `last_name` varchar(255) COLLATE utf8_bin NOT NULL DEFAULT '',
  `created_at` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',
  `updated_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=9 DEFAULT CHARSET=utf8 COLLATE=utf8_bin;

CREATE TABLE `matches` (
  `id` int(11) unsigned NOT NULL AUTO_INCREMENT,
  `datetime` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  `venue` varchar(100) COLLATE utf8_bin NOT NULL,
  `stage` varchar(100) COLLATE utf8_bin NOT NULL,
  `teamA` varchar(3) COLLATE utf8_bin NOT NULL DEFAULT '',
  `teamB` varchar(3) COLLATE utf8_bin NOT NULL DEFAULT '',
  `goalsAinit` int(11) DEFAULT NULL,
  `goalsBinit` int(11) DEFAULT NULL,
  `goalsAadded` int(11) DEFAULT NULL,
  `goalsBadded` int(11) DEFAULT NULL,
  `penaltiesA` int(11) DEFAULT NULL,
  `penaltiesB` int(11) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=65 DEFAULT CHARSET=utf8 COLLATE=utf8_bin;

CREATE TABLE `predictions` (
  `id` int(11) unsigned NOT NULL AUTO_INCREMENT,
  `id_user` int(11) unsigned DEFAULT NULL,
  `id_match` int(11) unsigned DEFAULT NULL,
  `goalsAinit` int(11) DEFAULT NULL,
  `goalsBinit` int(11) DEFAULT NULL,
  `goalsAadded` int(11) DEFAULT NULL,
  `goalsBadded` int(11) DEFAULT NULL,
  `penaltiesA` int(11) DEFAULT NULL,
  `penaltiesB` int(11) DEFAULT NULL,
  `points` int(11) DEFAULT '60',
  `created_at` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',
  `updated_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=11 DEFAULT CHARSET=utf8 COLLATE=utf8_bin;

我已经有一个系统可以在用户登录系统时获取积分：

for (var j in predictions) {
    if (matches[i].id == predictions[j].id) {
        if(predictions[j].score[0] != null && predictions[j].score[1]!= null){
            if((matches[i].score[0] != null && matches[i].score[1]!= null) && (
            (predictions[j].score[0] > predictions[j].score[1] && matches[i].score[0] > matches[i].score[1]) ||
            (predictions[j].score[0] < predictions[j].score[1] && matches[i].score[0] < matches[i].score[1]) ||
            (predictions[j].score[0] == predictions[j].score[1] && matches[i].score[0] == matches[i].score[1])
            )){
                //prediction correct, add points
            }else{
                //prediction incorrect
            }
        }
    }
    break;
}

得分是GoalAinit和goalsBinit

的数组

但我怎样才能为所有用户排名？它应该经常更新（虽然它不一定是实时的）但我觉得好像我每次想要更新排名时为每个用户执行2号，DB会爆炸......

有什么建议吗？感谢

Answer 1

我想出了这个QUERY来直接在mysql中计算预测的等级：

SELECT rank, id_user, first_name, last_name, iso, correct, points, total_predictions
FROM (
    SELECT @rank:=@rank+1 AS rank, id_user, first_name, last_name, iso, correct, points, total_predictions
    FROM (
        SELECT  p.id_user, u.first_name, u.last_name, iso,
                SUM(IF((p.goalsAinit > p.goalsBinit AND m.goalsAinit > m.goalsBinit)
                    OR (p.goalsAinit < p.goalsBinit AND m.goalsAinit < m.goalsBinit)
                    OR (p.goalsAinit = p.goalsBinit AND m.goalsAinit = m.goalsBinit), 1, 0)) AS correct,
                SUM(IF((p.goalsAinit > p.goalsBinit AND m.goalsAinit > m.goalsBinit)
                    OR (p.goalsAinit < p.goalsBinit AND m.goalsAinit < m.goalsBinit)
                    OR (p.goalsAinit = p.goalsBinit AND m.goalsAinit = m.goalsBinit), p.points, 0)) AS points,
                COUNT(*) AS total_predictions
        FROM    predictions p
        INNER JOIN matches_debug m ON m.id = p.id_match
        LEFT JOIN users u ON p.id_user = u.id
        LEFT JOIN flags f ON u.country = f.country
        GROUP BY p.id_user
        ORDER BY points DESC, correct DESC, total_predictions DESC, id_user
    ) AS rankings, (SELECT @rank:=0) AS r
) AS overall_rankings;

使用大型用户群执行是否安全？

世界杯预测系统排名

1 个答案: