linux mysql 触发器_Linux下MySQL触发器设置

在数据库操作中常需要delete，insert，update数据库表，在一个表发生变化时，其他表可以做相应的变化，下面就写下，今天研究了一

在数据库操作中常需要delete，，insert，update数据库表，在一个表发生变化时，其他表可以做相应的变化，下面就写下，今天研究了一天的Linux下触发器的知识：

delete -- > old

insert -- > new

update -- > old & new

1 tbl_AreaInfo

删除触发器

CREATE TRIGGER tr_ai_delete BEFORE Delete ON tbl_AreaInfo

FOR EACH ROW

delete from tbl_DataRight where tbl_DataRight.dr_AreaId=OLD.ai_Id

2 tbl_DeviceInfo

删除触发器

delimiter //

CREATE TRIGGER tr_di_delete BEFORE Delete ON tbl_DeviceInfo

FOR EACH ROW

BEGIN

delete from tbl_AlarmSubscribe where tbl_AlarmSubscribe.as_DeviceId=OLD.di_Id;

delete from tbl_CameraInfo where tbl_CameraInfo.ci_DeviceId=OLD.di_Id;

delete from tbl_FailureHistory where tbl_FailureHistory.fh_DeviceId=OLD.di_Id;

delete from tbl_AlarmInput where tbl_AlarmInput.ai_DeviceId=OLD.di_Id;

END;//

3 tbl_FailureHistory

删除触发器

CREATE TRIGGER tr_fh_delete BEFORE Delete ON tbl_FailureHistory

FOR EACH ROW

delete from tbl_ProcessHistory where tbl_ProcessHistory.ph_FailureHistoryId=OLD.fh_Id

插入触发器

delimiter //

CREATE trigger tr_fh_insert BEFORE Insert on tbl_FailureHistory

FOR EACH ROW

BEGIN

insert into tbl_ProcessHistory set ph_FailureHistoryId=new.fh_Id,

ph_ProcessStatusId=new.fh_ProcessStatusId,

ph_CreaterId=new.fh_ProcesserId,

ph_CreateTime=new.fh_ProcessTime,

ph_Memo=new.fh_ProcessMemo;

END;//

更新触发器

delimiter //

CREATE trigger tr_fh_update BEFORE Update on tbl_FailureHistory

FOR EACH ROW

BEGIN

if (old.flag = 1,new.flag = 1) then

insert into tbl_ProcessHistory set ph_FailureHistoryId=new.fh_Id,

ph_ProcessStatusId=new.fh_ProcessStatusId,

ph_CreaterId=new.fh_ProcesserId,

ph_CreateTime=new.fh_ProcessTime,

ph_Memo=new. fh_ProcessMemo;

end if;

if (old.flag = 1,new.flag = 0) then

update tbl_ProcessHistory set tbl_ProcessHistory.flag=0 where tbl_ProcessHistory.ph_FailureHistoryId=new.fh_Id;

end if;

if (old.flag = 0,new.flag = 1) then

update tbl_ProcessHistory set tbl_ProcessHistory.flag=1 where tbl_ProcessHistory.ph_FailureHistoryId=new.fh_Id;

End if;

END;//

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