mysql存储过程中游标如何遍历

概述mysql存储过程中游标如何遍历

MysqL存储过程中游标遍历的方法：首先取值，取多个字段；然后遍历数据结束标志，将结束标志绑定到游标，代码为【DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;】。

MysqL存储过程中游标遍历的方法：

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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