DELIMITER $$
USE `fdtdata`$$
DROP PROCEDURE IF EXISTS `fn_ev_PerformaceMessage02`$$
CREATE DEFINER=`root`@`%` PROCEDURE `fn_ev_PerformaceMessage02`(p_time DATETIME,p_AgentId VARCHAR(64))
BEGIN
-- p_time 必须是一个年月日的时间/*局部变量的定义 declare*/ DECLARE tempStudentId VARCHAR(64) DEFAULT NULL ;DECLARE tempSubjectId INT;DECLARE tempAve DECIMAL(18,2);DECLARE tempTime DATETIME;DECLARE tempLowMe INT;       -- 同一个科目下，比我低的学生个数DECLARE tempAllStudent INT;    -- 同一个科目下，所有的学生的个数 DECLARE tempPercent DECIMAL(18,2);   -- tempLowMe/tempAllStudentDECLARE ConstGood FLOAT DEFAULT 0.90; -- 设置比多少优秀高？DECLARE returnStr TEXT;
DECLARE cur1 CURSOR FOR  SELECT c.`StudentId`,c.`SubjectId` ,CAST(AVG(p.`AveScore`) AS DECIMAL(18,2)) AS ave
FROM `tb_fdt_courseitem` c INNER JOIN `tb_fdt_performance` p
ON c.`CourseItemId`=p.`CourseItemId`
WHERE c.`StartDate`>= p_time AND c.`EndDate` <DATE_ADD(p_time,INTERVAL 1 DAY)  AND c.`AgentId`=p_AgentId
GROUP BY studentid,subjectid
ORDER BY studentid;/*    mysql 用异常来判断是不是已经跳出了循环，把 游标 异常后 捕捉 ，并设置 循环使用 变量 tmpname 为 null 跳出循环。          */
DECLARE CONTINUE HANDLER FOR  NOT FOUND SET tempStudentId = NULL;DROP TEMPORARY TABLE IF EXISTS tmp_dingshi_PerformaceMessage;
CREATE TEMPORARY TABLE tmp_dingshi_PerformaceMessage
-- 获得某一天，学生的id和科目的id,已经自己在这个科目的平均分
SELECT c.`StudentId`,c.`SubjectId` ,CAST(AVG(p.`AveScore`) AS DECIMAL(18,2)) AS ave
FROM `tb_fdt_courseitem` c INNER JOIN `tb_fdt_performance` p
ON c.`CourseItemId`=p.`CourseItemId`
WHERE c.`StartDate`>= p_time AND c.`EndDate` <DATE_ADD(p_time,INTERVAL 1 DAY)  AND c.`AgentId`=p_AgentId
GROUP BY studentid,subjectid
ORDER BY studentid;/*开游标*/ OPEN cur1;/*游标向下走一步*/ FETCH cur1 INTO tempStudentId,tempSubjectId,tempAve;/* 循环体 这很明显 把游标查询出的 name 都加起并用 ; 号隔开 */WHILE ( tempStudentId IS NOT NULL) DO-- select tempStudentId,tempSubjectId,tempAve;SET tempLowMe= (SELECT COUNT(*) FROM tmp_dingshi_PerformaceMessage  WHERE ave<(tempAve) AND subjectid=tempSubjectId);SET tempAllStudent=(SELECT COUNT(*) FROM tmp_dingshi_PerformaceMessage WHERE subjectid=tempSubjectId);SET tempPercent=tempLowMe/tempAllStudent;SELECT tempStudentId,tempSubjectId,tempAve,tempLowMe,tempAllStudent,tempPercent;IF(tempPercent>=ConstGood) THEN  -- 如果比自己差的有19个人，一共20个人，那么19/20=95% 就是比95%的要高CALL fn_ev_PerformaceMessage03(tempStudentId,tempSubjectId);END IF;/*游标向下走一步*/ FETCH cur1 INTO tempStudentId,tempSubjectId,tempAve;END WHILE;CLOSE cur1;
SELECT returnStr;END$$
DELIMITER ;