Question

我正在使用PHP和MySQL数据库为游戏创建一个高分表

我已经得到它，以便它插入你的分数，然后告诉你你的位置，但是为了防止用同一个人向我发送垃圾邮件，我想要检查以下内容，

if score from your IP exists and score > your_current_highscore
UPDATE score

这很简单，令人难以理解的是，不是'得分'而是2个变量，'TIME'（完成所需的时间）和'PERCENT'（他们完成了多少游戏）。< / p>

我不确定如何构建SQL STATEMENT，我是否需要

if time OR percent > current

或

if time AND percent > current

TIME将是占主导地位的SORT，其次是百分比

有人可以为我解决这个问题吗？

Answer 1

尝试（对表名进行元语言）：

UPDATE score_table
SET    score = new_score
WHERE  score > your_current_highscore AND
       score in (SELECT score
                 FROM table_with_ips
                 WHERE ip = your_ip) AND
       user_id = your_user_id

如果score > your_current_highscore为false，则不会更新任何条目。

由于您有两个参数（时间和百分比）且第一个参数占主导地位，因此您可以检查这样的分数：

--- score > your_current_hightscore
+++ time > your_current_time OR
+++ (time = your_current_time AND percentage > your_current_percentage)

Answer 2

如果

，此查询将更新记录

新时间更好，百分比更好或相等，或

新时间相同，但完成的百分比更好：

UPDATE leaderboards
SET time=[player new time],
    percent=[player new percent]
WHERE ip=[player IP]
    AND (
        /*new time is better than old time AND new percent is better than or equal to old percent*/
        time > [player new time]
            AND percent <=[player new percent] /*maybe you don't want this condition, see next proposal*/

        /*OR new time is equal to old time AND new percent is better than old percent */
        OR (
        time =[player new time] 
            AND percent < [player new percent])
    )

或者，如果

新时间更好（无论百分比如何变化）或

新时间相同，但完成的百分比更好：

UPDATE leaderboards
SET time=[player new time],
    percent=[player new percent]
WHERE ip=[player IP]
    AND (
        /*new time is better than old time, regardless of change in percent*/
        time > [player new time]

        /*OR new time is equal to old time AND new percent is better than old percent */
        OR (
        time =[player new time] 
            AND percent < [player new percent])
    )

如果满足条件，则插入mySQL记录

2 个答案: