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`() BEGIN DECLARE 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 THEN LEAVE read_loop; END IF; SELECT EXAM_STATUS INTO estatus FROM t_exam WHERE EXAM_ID = id ; IF estatus =1 THEN SELECT 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  THEN UPDATE t_exam SET EXAM_STATUS = 2 WHERE EXAM_ID = id; ELSEIF curTime >= endTime THEN UPDATE t_exam SET EXAM_STATUS = 3 WHERE EXAM_ID = id; END IF; ELSE SELECT NOW() INTO curTime; SELECT EXAM_END_TIME INTO endTime  from t_exam WHERE EXAM_ID = id ; IF curTime >= endTime THEN UPDATE t_exam SET EXAM_STATUS = 3 WHERE EXAM_ID = id; END IF; END IF;     END LOOP;       CLOSE examIds; END

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