MySQL的经典用法(五)----触发器(转)
Sql代码CREATE TABLE `vardata` (
`Id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(255) DEFAULT NULL,
`time` datetime NOT NULL DEFAULT '0000-00-00 00:00:00',
`data` double(15,5) DEFAULT '-601.00000',
PRIMARY KEY (`Id`,`time`),
UNIQUE KEY `unique` (`name`,`time`)
)
CREATE TABLE `vardata_compute` (
`Id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(255) DEFAULT NULL,
`time` datetime DEFAULT NULL,
`data` double(15,5) DEFAULT NULL,
PRIMARY KEY (`Id`)
)
CREATE TABLE `vardata` (
`Id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(255) DEFAULT NULL,
`time` datetime NOT NULL DEFAULT '0000-00-00 00:00:00',
`data` double(15,5) DEFAULT '-601.00000',
PRIMARY KEY (`Id`,`time`),
UNIQUE KEY `unique` (`name`,`time`)
)
CREATE TABLE `vardata_compute` (
`Id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(255) DEFAULT NULL,
`time` datetime DEFAULT NULL,
`data` double(15,5) DEFAULT NULL,
PRIMARY KEY (`Id`)
)
Sql代码
DROP TRIGGER IF EXISTS trigger_insert_59data;
CREATE TRIGGER trigger_insert_59data
AFTER INSERT
ON vardata
FOR EACH ROW
BEGIN
DECLARE time_59 DateTime;
SET time_59 = NEW.time-INTERVAL 1 SECOND;
IF MINUTE(NEW.time)=0 AND SECOND(NEW.time)=0 THEN
INSERT INTO vardata_compute SET name=NEW.name,time=time_59,data=NEW.data;
END IF;
END;
DROP TRIGGER IF EXISTS trigger_delete_59data;
CREATE TRIGGER trigger_delete_59data
AFTER DELETE
ON vardata
FOR EACH ROW
BEGIN
DECLARE time_59 DateTime;
SET time_59 = OLD.time-INTERVAL 1 SECOND;
IF MINUTE(OLD.time)=0 AND SECOND(OLD.time)=0 THEN
DELETE FROM vardata_compute WHERE time=time_59 AND name=old.name;
END IF;
END;
DROP TRIGGER IF EXISTS trigger_update_59data;
CREATE TRIGGER trigger_update_59data
AFTER UPDATE
ON vardata
FOR EACH ROW
BEGIN
DECLARE time_59 DateTime;
SET time_59 = NEW.time-INTERVAL 1 SECOND;
IF MINUTE(NEW.time)=0 AND SECOND(NEW.time)=0 THEN
UPDATE vardata_compute SET data=NEW.data WHERE time=time_59 AND name=NEW.name;
END IF;
END;
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