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我有一个问题,通过用户给定的参数来排序我的存储过程,我试过阅读,但我尝试过的解决方案将无法工作。通过存储过程订购参数
那么,有没有人可以帮助我?我希望它通过我的Group_concat中的Type进行排序。它可以工作,如果我输入harcoded,如(ORDER BY Type1,ORDER BY Type2等)。但我想这样(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;
是,作品辉煌:-) – 2013-04-08 18:01:26
@ user2046146 AGAIN - 欢迎你任何时候:) – 2013-04-08 19:02:05