MYSQL使用存储过程根据查询结果更新数据

创建存储过程

需求，查询表a中，字段begin_time与end_time时间，相差小于45的数据，将这些数据的end_time时间更新为，与begin_time相差45分钟。

CREATE PROCEDURE update_data_info()
BEGIN
DECLARE temNumber INT DEFAULT 0;
DECLARE TempID INT;
declare sum int default 0;
declare i int default 0;
DECLARE UpdateDataCursor CURSOR FOR select dir.id from a dir inner join a dirTemp on dirTemp.id = dir.id where TIMESTAMPDIFF(MINUTE, dir.begin_time, dir.end_time)<45;
OPEN UpdateDataCursor;
select count(1) into sum from a;
while i<sum DO
	FETCH UpdateDataCursor INTO TempID;
	UPDATE a SET end_time=DATE_ADD(end_time,INTERVAL (45 - TIMESTAMPDIFF(MINUTE, begin_time, end_time)) MINUTE) WHERE id=TempID;
	set i=i+1;
end while;
CLOSE UpdateDataCursor;
END

调用

call update_data_info();

删除存储过程

DROP PROCEDURE IF EXISTS update_data_info;