按存储过程参数排序 [英] Order by stored procedure parameter
本文介绍了按存储过程参数排序的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我在通过用户给定的参数对存储过程进行排序时遇到了问题,我尝试阅读,但是尝试过的解决方案不起作用.
I have a problem ordering my stored procedure by a parameter given by a user, I have tried reading but the solutions I have tried won't work.
那么,有人可以帮助我吗?我希望可以从Group_concat中按类型对它进行排序.如果我以Harcoded形式输入它(例如,ORDER BY Type1,ORDER BY Type2等),它将起作用.但是我想要这样的东西(ORDER BY @specificStat).
So, is there somebody who can help me? I would like it to be sorted by Type from my Group_concat. It works if I type it in harcoded, like (ORDER BY Type1, ORDER BY Type2 and so on). But I would like something like this (ORDER BY @specificStat).
CREATE PROCEDURE getSpecificStatsBySeason(IN khID INT(11), IN seasonName varchar(40), IN specificStat INT(11))
BEGIN
SET @sql = NULL;
SET @khID = khID;
SET @seasonName = seasonName;
SET @specificStat = specificStat;
SELECT
GROUP_CONCAT(DISTINCT CONCAT('SUM(IF(em.eventTypeID = ',
et.eventTypeID, ', 1, 0)) AS Type',
et.eventTypeID )
) INTO @sql
FROM eventTypes AS et, `eventType-R-kh` AS eRk, kh AS kh WHERE et.eventTypeID = eRk.eventTypeID AND eRk.kh = kh.kh AND kh.khID = @khID;
SET @sql = CONCAT('SELECT u.userID, ud.firstname, ud.lastname,', @sql,
',
IFNULL((SELECT COUNT(s.activityID)
FROM activity AS a1, signup AS s
WHERE u.userid = s.userid
AND s.activityID = a1.activityID
AND a1.khID = @khID
AND s.answer = 1
AND se.seasonName = @seasonName
AND a1.activityDate BETWEEN se.seasonStart AND se.seasonEnd
AND a1.activityDate <= NOW()), 0) AS matchCount
FROM userData AS ud, userInfo AS u
LEFT JOIN activity AS a ON a.khID = @khID
RIGHT JOIN season AS se ON se.seasonName = @seasonName
AND a.activityDate BETWEEN se.seasonStart AND se.seasonEnd
LEFT JOIN `eventMatch` AS em ON em.userid = u.userid
AND em.activityID = a.activityID
LEFT JOIN activityMatch AS am ON a.activityID = am.activityID
WHERE u.khID = @khID
AND u.userID = ud.userID
GROUP BY u.UserID
ORDER BY @specificStat ;');
prepare stmt
FROM @sql;
execute stmt;
推荐答案
请改用此:
...
...
AND u.userID = ud.userID
GROUP BY u.UserID
ORDER BY ', @specificStat, ' ;');
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