MySQL基礎：觸發器

廢話不多說。自己看看吧.等以後有時間了再完善完善.^-^

Sql代碼

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代碼

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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