1.遷移數據
進行數據庫移植，SQL Server=>MySQL。SQL Server上有如下的Trigger
SET QUOTED_IDENTIFIER ON GO SET ANSI_NULLS ON GO ALTER TRIGGER [trg_risks] ON dbo.projectrisk FOR INSERT, UPDATE AS BEGIN UPDATE projectrisk SET classification = case when calc>= 9 then 3 when calc <9 and calc>=4 then 2 when calc <4 then 1 end from (select inserted.id, inserted.possibility*inserted.severity as calc from inserted) as T1 where projectrisk.id = T1.id END GO SET QUOTED_IDENTIFIER OFF GO SET ANSI_NULLS ON GO
簡單了解了下MySQL中，Trigger的語法。
# 創建 CREATE TRIGGER <觸發器名稱> { BEFORE | AFTER } { INSERT | UPDATE | DELETE } ON <表名稱> FOR EACH ROW <觸發器SQL語句> # 刪除 DROP TRIGGER <觸發器名稱> 注：創建觸發器需要CREATE TRIGGER權限。（HeidiSQL中執行Trigger語句會有bug）
由于MySQL中的每個觸發器只能針對一個動作，所以本次移植就需要創建兩個觸發器。對于發生變更的行，在觸發器中可以用 NEW 來代替。
下邊的觸發器有什么問題嗎？
delimiter && CREATE TRIGGER trg_risks_insert AFTER INSERT ON `projectrisk` FOR EACH ROW UPDATE projectrisk SET classification = CASE WHEN possibility*severity>=9 THEN 3 WHEN possibility*severity <9 AND possibility*severity>=4 THEN 2 WHEN possibility*severity <4 THEN 1 END WHERE id = new.id; && CREATE TRIGGER trg_risks_update AFTER UPDATE ON `projectrisk` FOR EACH ROW UPDATE projectrisk SET classification = CASE WHEN possibility*severity>=9 THEN 3 WHEN possibility*severity <9 AND possibility*severity>=4 THEN 2 WHEN possibility*severity <4 THEN 1 END WHERE id = new.id; && delimiter ;
問題就是，沒有考慮到觸發器中的修改也會觸發觸發器，進入了死循環。做了如下修改后，終于OK了。
delimiter && CREATE TRIGGER trg_risks_insert BEFORE INSERT ON `projectrisk` FOR EACH ROW BEGIN SET new.classification = CASE WHEN new.possibility*new.severity>=9 THEN 3 WHEN new.possibility*new.severity <9 AND new.possibility*new.severity>=4 THEN 2 WHEN new.possibility*new.severity <4 THEN 1 END; END && CREATE TRIGGER trg_risks_update BEFORE UPDATE ON `projectrisk` FOR EACH ROW BEGIN SET new.classification = CASE WHEN new.possibility*new.severity>=9 THEN 3 WHEN new.possibility*new.severity <9 AND new.possibility*new.severity>=4 THEN 2 WHEN new.possibility*new.severity <4 THEN 1 END; END && delimiter ;
2.同步備份數據記錄表
添加記錄到新記錄表
DELIMITER $$USE `DB_Test`$$CREATE /*!50017 DEFINER = 'root'@'%' */ TRIGGER `InsertOPM_Alarm_trigger` BEFORE INSERT ON `OPM_Alarm` FOR EACH ROW BEGININSERT INTO OPM_Alarm_copy (AlarmId,AlarmCode,AlarmTypeId,AlarmLevelId,AlarmObjectCode,AlarmStatus,AlarmHandleUser,AlarmHandleTime,ADDTIME,ParkUserId,BerthCode,BargainOrderCode,BerthStartTime)VALUES(new.AlarmId,new.AlarmCode,new.AlarmTypeId,new.AlarmLevelId,new.AlarmObjectCode,new.AlarmStatus,new.AlarmHandleUser,new.AlarmHandleTime,new.ADDTIME,new.ParkUserId,new.BerthCode,new.BargainOrderCode,new.BerthStartTime); END;$$DELIMITER ;CREATE TRIGGER InsertOPM_Alarm_trigger BEFORE INSERT ON OPM_Alarm FOR EACH ROWBEGIN INSERT INTO OPM_Alarm_copy (AlarmId,AlarmCode,AlarmTypeId,AlarmLevelId,AlarmObjectCode,AlarmStatus,AlarmHandleUser,AlarmHandleTime,ADDTIME,ParkUserId,BerthCode,BargainOrderCode,BerthStartTime)VALUES(new.AlarmId,new.AlarmCode,new.AlarmTypeId,new.AlarmLevelId,new.AlarmObjectCode,new.AlarmStatus,new.AlarmHandleUser,new.AlarmHandleTime,new.ADDTIME,new.ParkUserId,new.BerthCode,new.BargainOrderCode,new.BerthStartTime);END ;
mysql觸發器監控mysql數據表記錄刪除操作 DELIMITER $$
USE `DB_Test`$$DROP TRIGGER /*!50032 IF EXISTS */ `SYS_OPM_trigger`$$CREATE /*!50017 DEFINER = 'root'@'%' */ TRIGGER `SYS_OPM_trigger` AFTER DELETE ON `OPM_Alarm` FOR EACH ROW BEGIN DECLARE str VARCHAR(40000); SET str=CONCAT(old.AlarmId,'@',old.AlarmCode,'@',old.AlarmTypeId,'@',old.AlarmLevelId,'@', old.AlarmObjectCode,'@',old.AlarmStatus,'@',old.AlarmHandleUser,'@',old.AlarmHandleTime,'@', old.AddTime,'@',old.ParkUserId,'@',old.BerthCode,'@',old.BargainOrderCode,'@',old.BerthStartTime); INSERT INTO OPM_AlarmAction_log(UserName,Client_IP,Delete_before_key,Delete_Date) VALUES(SUBSTRING_INDEX(USER(),'@',1),SUBSTRING_INDEX(USER(),'@',-1), str, NOW()); END;$$DELIMITER ;
刪除前 添加原記錄備份到另一記錄表
DELIMITER $$USE `DB_Test`$$DROP TRIGGER /*!50032 IF EXISTS */ `InsertOPM_Alarm_trigger`$$CREATE /*!50017 DEFINER = 'root'@'%' */ TRIGGER `InsertOPM_Alarm_trigger` BEFORE DELETE ON `OPM_Alarm` FOR EACH ROW BEGIN INSERT INTO OPM_Alarm_copy (AlarmId,AlarmCode,AlarmTypeId,AlarmLevelId,AlarmObjectCode,AlarmStatus,AlarmHandleUser, AlarmHandleTime,ADDTIME,ParkUserId,BerthCode,BargainOrderCode,BerthStartTime) VALUES(old.AlarmId,old.AlarmCode,old.AlarmTypeId,old.AlarmLevelId,old.AlarmObjectCode,old.AlarmStatus,old.AlarmHandleUser, old.AlarmHandleTime,old.ADDTIME,old.ParkUserId,old.BerthCode,old.BargainOrderCode,old.BerthStartTime); END;$$DELIMITER ;
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