From 2fe3c0a92f84d696aaa6e35946d1ddab8497c263 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=8D=A0=E5=BF=97=E6=96=B0?= <1759998065@qq.com>
Date: Fri, 7 Oct 2022 05:25:42 +0000
Subject: [PATCH 1/2] =?UTF-8?q?=E6=96=B0=E5=BB=BA=2010.6?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
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---
 "05\345\215\240\345\277\227\346\226\260/10.6/.keep" | 0
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 create mode 100644 "05\345\215\240\345\277\227\346\226\260/10.6/.keep"

diff --git "a/05\345\215\240\345\277\227\346\226\260/10.6/.keep" "b/05\345\215\240\345\277\227\346\226\260/10.6/.keep"
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index 0000000..e69de29
-- 
Gitee


From 3bc8c5ced4230c8b618cd93212589dcd53f89d20 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=8D=A0=E5=BF=97=E6=96=B0?= <1759998065@qq.com>
Date: Fri, 7 Oct 2022 05:26:06 +0000
Subject: [PATCH 2/2] =?UTF-8?q?05=E5=8D=A0=E5=BF=97=E6=96=B0?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
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Signed-off-by: 占志新 <1759998065@qq.com>
---
 .../10.6/SQLQuery1.sql"                       | 98 +++++++++++++++++++
 .../10.6/\346\270\270\346\240\207.txt"        | 52 ++++++++++
 2 files changed, 150 insertions(+)
 create mode 100644 "05\345\215\240\345\277\227\346\226\260/10.6/SQLQuery1.sql"
 create mode 100644 "05\345\215\240\345\277\227\346\226\260/10.6/\346\270\270\346\240\207.txt"

diff --git "a/05\345\215\240\345\277\227\346\226\260/10.6/SQLQuery1.sql" "b/05\345\215\240\345\277\227\346\226\260/10.6/SQLQuery1.sql"
new file mode 100644
index 0000000..799e56e
--- /dev/null
+++ "b/05\345\215\240\345\277\227\346\226\260/10.6/SQLQuery1.sql"
@@ -0,0 +1,98 @@
+use test_trigger
+go
+
+select * from People
+select * from Department
+
+--��3��ʹ���α�ʵ�ּ�н����
+declare cur_id cursor scroll
+for select PeopleId from People
+
+open cur_id
+
+declare @p_Id int,@p_salary money = 2000
+fetch first from cur_id into @p_Id
+
+while(@@FETCH_STATUS = 0)
+begin
+	update People set PeopleSalary += @p_salary where PeopleId = @p_Id
+	fetch next from cur_id into @p_Id
+end
+
+select * from people
+
+close cur_id
+
+--��4:ʹ���α�ɾ�������Ա��
+declare cur_del cursor scroll
+for select PeopleId,PeopleSalary from People
+
+open cur_del
+
+declare @pId int,@pSalary money
+fetch first from cur_del into @pId,@pSalary
+
+while(@@FETCH_STATUS = 0)
+begin
+	if(@pSalary < 10000) 
+	begin
+		delete People where PeopleId = @pId
+		fetch next from cur_del into @pId,@pSalary
+	end
+
+	fetch next from cur_del into @pId,@pSalary
+end
+
+select * from people
+
+close cur_del
+
+--ʹ���α� ʵ��:���A����B����ID�ֶ�ֵ��ͬ����ô��B���е�ʡ�ݣ����� �޸ij���A���еij���һ�£�������
+create database AB
+go
+use AB
+go
+create table A(
+aId int not null,
+aProvince varchar(50),
+aCity varchar(50)
+)
+go
+create table B(
+bId int not null,
+bProvince varchar(50),
+bCity varchar(50)
+)
+go
+insert into A(aId,aProvince,aCity) values 
+(1,'����','����'),
+(6,'�㶫','����'),
+(7,'����','����'),
+(8,'����','����')
+go
+insert into B(bId,bProvince,bCity) values 
+(1,'�ӱ�','ʯ��ׯ'),
+(2,'�㶫','��ͷ'),
+(3,'����','����'),
+(4,'ɽ��','̫ԭ')
+go
+
+--deallocate cur_city
+declare cur_city cursor scroll
+for select A.* from A join B on A.aId = B.bId
+
+open cur_city
+
+declare @aid int,@apro varchar(50),@acity varchar(50)
+fetch first from cur_city into @aid,@apro,@acity
+
+while(@@FETCH_STATUS = 0)
+begin
+	update B set B.bProvince = @apro,B.bCity = @acity where B.bId = @aid
+	fetch next from cur_city into @aid,@apro,@acity
+end
+
+select * from A
+select * from B
+
+close cur_city
\ No newline at end of file
diff --git "a/05\345\215\240\345\277\227\346\226\260/10.6/\346\270\270\346\240\207.txt" "b/05\345\215\240\345\277\227\346\226\260/10.6/\346\270\270\346\240\207.txt"
new file mode 100644
index 0000000..d68f236
--- /dev/null
+++ "b/05\345\215\240\345\277\227\346\226\260/10.6/\346\270\270\346\240\207.txt"
@@ -0,0 +1,52 @@
+## 游标
+
+#### 什么是游标
+
+游标(Cursor)它使用户可逐行访问由SQL Server返回的结果集。使用游标(cursor)的一个主要的原因就是把集合操作转换成**单个记录处理方式**。用SQL语言从数据库中检索数据后，结果放在内存的一块区域中，且结果往往是一个含有多个记录的集合。游标机制允许用户在SQL server内逐行地访问这些记录，按照用户自己的意愿来显示和处理这些记录。
+
+游标分类:
+
+（1）静态游标(Static)：在操作游标的时候，数据发生变化，游标中数据不变
+（2）动态游标(Dynamic)：在操作游标的时候，数据发生变化，游标中数据改变，默认值。
+（3）键集驱动游标(KeySet)：在操作游标的时候，被标识的列发生改变，游标中数据改变，其他列改变，游标中数据不变。
+
+
+
+#### 游标的使用
+
+**创建游标：**
+
+```sql
+--1.创建游标(Scroll代表滚动游标，不加Scroll则是只进的，只能支持fetch next)
+declare <游标名> cursor scroll for select stuname from stuinfo
+```
+
+**打开游标：**
+
+```sql
+open  <游标名>
+```
+
+**关闭游标：**
+
+```
+close <游标名>
+```
+
+**释放游标：**
+
+```
+deallocate <游标名>
+```
+
+
+
+**提取数据操作：**
+
+```sql
+fetch first from <游标名> --结果集的第一行
+fetch last from <游标名>  --最后一行
+fetch absolute 1 from <游标名> --从游标的第一行开始数，第n行。
+fetch relative 3 from <游标名> --从当前位置数，第n行。
+fetch next from <游标名> --当前位置的下一行
+fetch prior from <游标名> --当前位置的上一行
\ No newline at end of file
-- 
Gitee