事件游标

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事件游标：

BEGIN
DECLARE cx_id INT(10);
DECLARE t_query VARCHAR(500);
DECLARE done INT DEFAULT FALSE;
DECLARE cur CURSOR FOR SELECT junda_pmcloud.t_ipguard_status.ipguard_id FROM junda_pmcloud.t_ipguard_status;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;
OPEN cur;
read_loop:LOOP
FETCH cur INTO cx_id;
IF done THEN
LEAVE read_loop;
END IF;
SELECT TIMESTAMPDIFF(SECOND, (SELECT t_ipguard_status.updatetime from t_ipguard_status where t_ipguard_status.ipguard_id=cx_id) ,now()) INTO @t_time;
UPDATE t_ipguard_status set t_ipguard_status.is_active=0 WHERE @t_time>60 and t_ipguard_status.ipguard_id=cx_id;

END LOOP;
CLOSE cur;
END

创建一个事件，对某个表的内容进行遍历循并当时间差>60时，进行数据库操作。

当在END LOOP; 前添加 kill cx_id; 则只执行一次。而不是遍历。

事件游标

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原文地址：http://www.cnblogs.com/hzijone/p/4380168.html