From f5cfcbc90b8f1dca4158cc11c8f0e9abb04c8688 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E2=80=98=E6=9D=8E=E9=9F=A6=E5=B3=B0=E2=80=99?=
 <2669441367@qq.com>
Date: Wed, 12 Oct 2022 00:09:58 +0800
Subject: [PATCH] 12

---
 ...-\350\247\246\345\217\221\345\231\250.sql" | 101 ++++++++++++++++++
 ...10\350\247\246\345\217\221\345\231\250.md" |  95 ++++++++++++++++
 2 files changed, 196 insertions(+)
 create mode 100644 "01\346\235\216\351\237\246\345\263\260/\344\275\234\344\270\232/2022-10-10-\350\247\246\345\217\221\345\231\250.sql"
 create mode 100644 "01\346\235\216\351\237\246\345\263\260/\347\254\224\350\256\260/2022-10-10\350\247\246\345\217\221\345\231\250.md"

diff --git "a/01\346\235\216\351\237\246\345\263\260/\344\275\234\344\270\232/2022-10-10-\350\247\246\345\217\221\345\231\250.sql" "b/01\346\235\216\351\237\246\345\263\260/\344\275\234\344\270\232/2022-10-10-\350\247\246\345\217\221\345\231\250.sql"
new file mode 100644
index 0000000..f542e79
--- /dev/null
+++ "b/01\346\235\216\351\237\246\345\263\260/\344\275\234\344\270\232/2022-10-10-\350\247\246\345\217\221\345\231\250.sql"
@@ -0,0 +1,101 @@
+--部门
+create table Department
+(
+	DepartmentId varchar(10) primary key , --主键，自动增长
+	DepartmentName nvarchar(50), --部门名称
+)
+--人员信息
+create table People
+(
+	PeopleId int primary key identity(1,1), --主键,自动增长
+	DepartmentId varchar(10), --部门编号,外键,与部门表关联
+	PeopleName nvarchar(20), --人员姓名
+	PeopleSex nvarchar(2), --人员性别
+	PeopleSalary money, --薪水
+)
+insert into Department(DepartmentId,DepartmentName)
+values('001','总经办')
+insert into Department(DepartmentId,DepartmentName)
+values('002','市场部')
+insert into Department(DepartmentId,DepartmentName)
+values('003','人事部')
+insert into Department(DepartmentId,DepartmentName)
+values('004','财务部')
+
+insert into People(DepartmentId,PeopleName,PeopleSex,PeopleSalary)
+values('001','刘备','男',8000)
+insert into People(DepartmentId,PeopleName,PeopleSex,PeopleSalary)
+values('001','关羽','男',5000)
+insert into People(DepartmentId,PeopleName,PeopleSex,PeopleSalary)
+values('002','张飞','男',3000)
+
+
+
+--假设有部门表和员工表，在添加员工的时候，该员工的部门编号如果在部门表中找不到，
+--则自动添加部门信息，部门名称为"新部门"。
+
+go
+create trigger tri_InsertDepartment
+on People for insert
+as 
+	declare @DepartmentId varchar(20)
+	select @DepartmentId =DepartmentId from inserted
+	if exists(select * from Department where DepartmentId = @DepartmentId)
+		print '已存在的部门编号' 
+	else
+		insert into Department values(@DepartmentId,'新部门') 
+go
+
+--drop trigger tri_InsertDepartment
+
+insert into People(DepartmentId,PeopleName,PeopleSex,PeopleSalary)
+values('005','阿柳','男',2000)
+
+--（2）触发器实现，删除一个部门的时候将部门下所有员工全部删除。
+
+
+go
+create trigger tri_DeteleDepartmentById
+on Department for delete
+as
+	delete from People where DepartmentId = (select DepartmentId from deleted)
+go
+
+delete from Department where DepartmentId = '005'
+
+
+
+--**（3）创建一个触发器，删除一个部门的时候判断该部门下是否有员工，有则不删除，没有则删除。**
+-- 预习instead of触发器 ()
+go
+create trigger tri_DeleteDepartmentName
+on Department instead of delete
+as
+begin
+	if exists(select * from People where DepartmentId = (select DepartmentId from deleted))
+		print '该部门有人不能删除'
+	else
+		delete from Department where DepartmentId = (select DepartmentId from deleted)
+		print '该部门没人已删除'
+end
+
+--drop trigger tri_DeleteDepartmentName
+
+delete from Department where DepartmentId = '003'
+
+
+--（4）修改一个部门编号之后，将该部门下所有员工的部门编号同步进行修改
+
+select * from Department
+select * from People
+go
+create trigger tri_UpadateDepartmentId
+on Department for update
+as
+	declare @oldDepId varchar(10),@newDepId varchar(10)
+	select @oldDepId = (select DepartmentId from deleted)	
+	select @newDepId = (select DepartmentId from inserted)
+	print '旧的部门编号:'+@oldDepId+ char(9) + '新的部门编号:' + @newDepId
+	update People set DepartmentId = @newDepId where DepartmentId = @oldDepId
+go
+update Department set DepartmentId = '008' where DepartmentId = '001'
diff --git "a/01\346\235\216\351\237\246\345\263\260/\347\254\224\350\256\260/2022-10-10\350\247\246\345\217\221\345\231\250.md" "b/01\346\235\216\351\237\246\345\263\260/\347\254\224\350\256\260/2022-10-10\350\247\246\345\217\221\345\231\250.md"
new file mode 100644
index 0000000..1b43a85
--- /dev/null
+++ "b/01\346\235\216\351\237\246\345\263\260/\347\254\224\350\256\260/2022-10-10\350\247\246\345\217\221\345\231\250.md"
@@ -0,0 +1,95 @@
+## 瑙﹀彂鍣紙trigger锛�
+
+#### 浠�涔堟槸瑙﹀彂鍣細 insert  --銆� 涓�绯诲垪闅忕潃鎻掑叆鎿嶄綔鑷姩鎵ц鐨剆ql璇彞闆嗗悎
+
+ **瑙﹀彂鍣�**锛� trigger 锛夋槸浣滀负**瀵规暟鎹簱淇敼鐨勮繛甯︽晥鏋�**鑰�**鐢辩郴缁熻嚜鍔ㄦ墽琛�**鐨勪竴鏉¤鍙ャ�傚畠鏄竴绉嶇壒娈婄殑**瀛樺偍杩囩▼**銆備篃鏄竴涓�**浜嬪姟**锛堝彲浠ュ洖婊氾級銆備负浜嗗畾涔変竴涓猍瑙﹀彂鍣╙(https://so.csdn.net/so/search?q=瑙﹀彂鍣�&spm=1001.2101.3001.7020)锛屾垜浠繀椤伙細
+
+- 鎸囨槑**浠�涔堟椂鍊欐墽琛岃Е鍙戝櫒**銆傝繖琚媶鍒嗕负**寮曡捣瑙﹀彂鍣ㄨ妫�娴嬬殑涓�涓猏*浜嬩欢\***鍜�**瑙﹀彂鍣ㄧ户缁墽琛屾墍蹇呴』婊¤冻鐨勪竴涓潯浠�**銆�
+- 鎸囨槑**褰撹Е鍙戝櫒鎵ц鏃舵墍閲囧彇鐨勫姩浣�**銆�
+
+
+
+#### 瑙﹀彂鍣ㄥ垎绫�
+
+鍒嗕负 DML瑙﹀彂鍣�
+
+#### DML瑙﹀彂鍣�  锛� 澧炲垹鏀�
+
+##### after瑙﹀彂鍣細  澧炲垹鏀� 涔嬪悗鎵ц鐨� 
+
+after瑙﹀彂鍣ㄤ富瑕佺敤浜庯細insert锛寀pdate锛宒elete
+
+##### instead of 瑙﹀彂鍣�     锛� 澧炲垹鏀� 涔嬪墠妫�鏌ョ殑
+
+
+
+#### 鍒涘缓瑙﹀彂鍣ㄧ殑璇彞
+
+```sql
+CREATE TRIGGER <瑙﹀彂鍣ㄥ悕绉�>
+ 
+ON table_name
+FOR [DELETE, INSERT, UPDATE]
+ 
+AS
+ 
+  T-SQL璇彞
+ 
+GO
+--WITH ENCRYPTION琛ㄧず鍔犲瘑瑙﹀彂鍣ㄥ畾涔夌殑SQL鏂囨湰
+
+--DELETE, INSERT, UPDATE鎸囧畾瑙﹀彂鍣ㄧ殑绫诲瀷
+```
+
+
+
+## 鎬荤粨
+
+ 1.鎻掑叆鎿嶄綔锛圛nsert锛� 
+***\*inserted 琛╘****鏈夋暟鎹紝***\*deleted 琛╘****鏃犳暟鎹� 
+
+2.鍒犻櫎鎿嶄綔锛圖elete锛� 
+***\*inserted 琛╘****鏃犳暟鎹紝***\*deleted 琛╘****鏈夋暟鎹� 
+
+3.鏇存柊鎿嶄綔锛圲pdate锛� 
+***\*inserted 琛╘****鏈夋暟鎹紙鏂版暟鎹級锛�***\*deleted 琛╘****鏈夋暟鎹紙鏃ф暟鎹級
+
+
+
+棰勪範锛�
+
+4.**鍒涘缓鏇夸唬瑙﹀彂鍣�**
+
+**涓庡墠闈粙缁嶇殑涓夌after瑙﹀彂鍣ㄤ笉鍚岋紝SqlServer鏈嶅姟鍣ㄥ湪鎵цafter瑙﹀彂鍣ㄧ殑sql浠ｇ爜鍚庯紝鍏堝缓绔嬩复鏃剁殑inserted琛ㄥ拰deleted琛紝鐒跺悗鎵ц浠ｇ爜涓鏁版嵁搴撴搷浣滐紝鏈�鍚庢墠婵�娲昏Е鍙戝櫒涓殑浠ｇ爜銆傝�屽浜庢浛浠�(instead of****)瑙﹀彂鍣�,\**SqlServer鏈嶅姟鍣ㄥ湪鎵ц瑙﹀彂instead of 瑙﹀彂鍣ㄧ殑浠ｇ爜鏃讹紝鍏堝缓绔媆*\*涓存椂鐨刬nserted琛ㄥ拰deleted琛紝鐒跺悗鐩存帴瑙﹀彂instead of瑙﹀彂鍣紝鑰屾嫆缁濇墽琛岀敤鎴疯緭鍏ョ殑DML鎿嶄綔璇彞銆俓*\**\***
+
+璇彞锛�
+
+```sql
+create tigger tri_name
+on table_name instead of {[INSERT] , [UPDATE] ,] [DELETE]}
+as
+begin
+	{sql_statements}
+end
+```
+
+
+
+```sql
+--渚嬮锛�
+--**锛�3锛夊垱寤轰竴涓Е鍙戝櫒锛屽垹闄や竴涓儴闂ㄧ殑鏃跺�欏垽鏂閮ㄩ棬涓嬫槸鍚︽湁鍛樺伐锛屾湁鍒欎笉鍒犻櫎锛屾病鏈夊垯鍒犻櫎銆�**
+go
+create trigger tri_DeleteDepartmentName
+on Department instead of delete
+as
+begin
+	if exists(select * from People where DepartmentId = (select DepartmentId from deleted))
+		print '璇ラ儴闂ㄦ湁浜轰笉鑳藉垹闄�'
+	else
+		delete from Department where DepartmentId = (select DepartmentId from deleted)
+		print '璇ラ儴闂ㄦ病浜哄凡鍒犻櫎'
+end
+
+
+```
+
-- 
Gitee