SQL_触发器学习

--触发器学习
-------------------------------------------------------------------------------after 触发器-------------------------------------------------------------------------------
--1 insert 触发器
IF EXISTS(SELECT * FROM sys.objects WHERE name='tgr_tablename_insert')
DROP TRIGGER tgr_tablename_insert
GO
CREATE TRIGGER tgr_tablename_insert
ON dbo.TB_HR_SatisfactionEvaluation_Quota
--插入数据触发
FOR INSERT
AS
--触发执行的操作
INSERT INTO dbo.TB_HR_SatisfactionEvaluation_Quota( EvaluationYear ,EvaluationType ,LocationName ,DescVal ,DeptName ,EvaluationDesc ,enable ,createby ,CreateTime ,updateby ,updateTime)
VALUES('2017','test01','test01',123,'test01','test01',1,1,GETDATE(),1,GETDATE())
GO

--2 delete 触发器
IF EXISTS(SELECT * FROM sys.objects WHERE name='tgr_tablename_delete')
DROP TRIGGER tgr_tablename_delete
GO
CREATE TRIGGER tgr_tablename_delete
ON dbo.TB_HR_SatisfactionEvaluation_Quota
FOR DELETE
AS
--触发执行执行的操作
--DELETE FROM dbo.TB_HR_SatisfactionEvaluation_Quota WHERE CreateTime='2017-07-31' AND LocationName='test01'
PRINT '备份数据中...'

IF(OBJECT_ID('BackupTest')IS NOT NULL)
BEGIN

INSERT INTO BackupTest
SELECT
EvaluationYear ,
EvaluationType ,
LocationName ,
DescVal ,
DeptName ,
EvaluationDesc ,
enable ,
createby ,
CreateTime ,
updateby ,
updateTime
FROM Deleted;
END
ELSE
BEGIN
SELECT * INTO BackupTest FROM Deleted
END

PRINT '数据备份成功!'
GO

--3 update触发器
IF EXISTS(SELECT * FROM sys.objects WHERE name='tgr_tablename_update')
DROP TRIGGER tgr_tablename_update
GO
CREATE TRIGGER tgr_tablename_update
ON dbo.TB_HR_SatisfactionEvaluation_Quota
FOR UPDATE
AS
--触发器要执行的操作 inserted表 deleted表

--inserted表中的数据
INSERT INTO dbo.BackupTest SELECT
Inserted.EvaluationYear ,
Inserted.EvaluationType ,
Inserted.LocationName ,
Inserted.DescVal ,
Inserted.DeptName ,
Inserted.EvaluationDesc ,
Inserted.enable ,
Inserted.createby ,
Inserted.CreateTime ,
Inserted.updateby ,
Inserted.updateTime FROM Inserted
--deleted表中的数据
INSERT INTO dbo.BackupTest SELECT
Deleted.EvaluationYear ,
Deleted.EvaluationType ,
Deleted.LocationName ,
Deleted.DescVal ,
Deleted.DeptName ,
Deleted.EvaluationDesc ,
Deleted.enable ,
Deleted.createby ,
Deleted.CreateTime ,
Deleted.updateby ,
Deleted.updateTime FROM Deleted
GO
-------------------------------------------------------------------------------after 触发器-------------------------------------------------------------------------------

-------------------------------------------------------------------------------instead of 触发器-------------------------------------------------------------------------------
/*
instead of 触发器 不执行相应的update delete insert 操作，执行的只是触发器本身的脚本
*/
IF EXISTS(SELECT * FROM sys.objects WHERE name='tgr_tablename_insteadOf')
DROP TRIGGER tgr_tablename_insteadOf
GO
CREATE TRIGGER tgr_tablename_insteadOf
ON dbo.TB_HR_SatisfactionEvaluation_Quota INSTEAD OF DELETE /*update insert*/
AS
DECLARE @LocationName NVARCHAR(50)=''
SELECT @LocationName=Deleted.LocationName FROM Deleted
PRINT 'LocationName是'+@LocationName
--暂时不删除数据的
DELETE FROM dbo.TB_HR_SatisfactionEvaluation_Quota WHERE LocationName='test01'
GO

-------------------------------------------------------------------------------instead of 触发器-------------------------------------------------------------------------------

--显示自定义消息 raiseError
IF EXISTS(SELECT * FROM sys.objects WHERE name='tgr_messager')
DROP TRIGGER tgr_messager
GO
CREATE TRIGGER tgr_messager
ON dbo.TB_HR_SatisfactionEvaluation_Quota
AFTER INSERT,DELETE
AS
RAISERROR('tgr_messager触发器被触发执行',16,10)
GO

---启用 禁用触发器
DISABLE TRIGGER tgr_messager ON dbo.TB_HR_SatisfactionEvaluation_Quota;
ENABLE TRIGGER tgr_messager ON dbo.TB_HR_SatisfactionEvaluation_Quota;

--查看已经存在的触发器
SELECT * FROM sys.triggers
SELECT * FROM sys.objects WHERE type='TR'