数据库|mysql教程
mysql,遍历
数据库-mysql教程
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mysql存储过程中游标遍历的方法：
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CREATE DEFINER=`root`@`%` PROCEDURE `updStatus`()BEGINDECLARE startTime DATETIME;DECLARE endTime DATETIME;DECLARE curTime DATETIME;DECLARE id VARCHAR(36); DECLARE estatus VARCHAR(4); -- 遍历数据结束标志 DECLARE done INT DEFAULT FALSE; -- 游标 DECLARE examIds CURSOR FOR SELECT EXAM_ID FROM t_exam WHERE EXAM_STATUS = 1 or EXAM_STATUS = 2; -- 将结束标志绑定到游标 DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;OPEN examIds; -- 遍历 read_loop: LOOP-- 取值 取多个字段FETCH NEXT from examIds INTO id;IF done THENLEAVE read_loop;END IF;SELECT EXAM_STATUS INTO estatus FROM t_exam WHERE EXAM_ID = id ;IF estatus =1 THENSELECT NOW() INTO curTime;SELECT EXAM_START_TIME INTO startTime from t_exam WHERE EXAM_ID = id ;SELECT EXAM_END_TIME INTO endTime from t_exam WHERE EXAM_ID = id ;IF curTime >= startTime AND endTime > curTime THENUPDATE t_exam SET EXAM_STATUS = 2 WHERE EXAM_ID = id;ELSEIF curTime >= endTime THENUPDATE t_exam SET EXAM_STATUS = 3 WHERE EXAM_ID = id;END IF;ELSESELECT NOW() INTO curTime;SELECT EXAM_END_TIME INTO endTime from t_exam WHERE EXAM_ID = id ;IF curTime >= endTime THENUPDATE t_exam SET EXAM_STATUS = 3 WHERE EXAM_ID = id;END IF;END IF; END LOOP;CLOSE examIds;END
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