From 4926c2567861194b22d7e602c4887225e7984100 Mon Sep 17 00:00:00 2001
From: lzlk <1930069369@qq.com>
Date: Thu, 29 Sep 2022 00:30:46 +0800
Subject: [PATCH] =?UTF-8?q?=E7=AC=AC=E5=85=AB=E6=AC=A1=E4=BD=9C=E4=B8=9A?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
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---
 .../2022-9-28\344\275\234\344\270\232.sql"    | 48 +++++++++++++++++++
 ...4\350\256\260 \344\272\213\345\212\241.md" | 21 ++++++++
 2 files changed, 69 insertions(+)
 create mode 100644 "07 \345\273\226\346\262\273\345\205\210/\344\275\234\344\270\232/2022-9-28\344\275\234\344\270\232.sql"
 create mode 100644 "07 \345\273\226\346\262\273\345\205\210/\347\254\224\350\256\260/2022-9-28\347\254\224\350\256\260 \344\272\213\345\212\241.md"

diff --git "a/07 \345\273\226\346\262\273\345\205\210/\344\275\234\344\270\232/2022-9-28\344\275\234\344\270\232.sql" "b/07 \345\273\226\346\262\273\345\205\210/\344\275\234\344\270\232/2022-9-28\344\275\234\344\270\232.sql"
new file mode 100644
index 0000000..ad54ab8
--- /dev/null
+++ "b/07 \345\273\226\346\262\273\345\205\210/\344\275\234\344\270\232/2022-9-28\344\275\234\344\270\232.sql"	
@@ -0,0 +1,48 @@
+--假设刘备取款6000，(添加check约束，设置账户余额必须>=0)，要求：使用事务实现，修改余额和添加取款记录两步操作使用事务
+	use BankTest
+	alter table bankcard add constraint money check(cardmoney>=0)
+	update BankCard set CardMoney=7000 where AccountId=1
+	begin transaction
+	declare @myerr int = 0
+	declare @money decimal(13,2)=6000,
+	@id int=(
+	select AccountId from AccountInfo where RealName='刘备')
+	declare
+	@price decimal(13,2)=(select CardMoney from BankCard where
+	AccountId=@id)
+	declare @cardno varchar(50)=(select cardno from BankCard where AccountId=@id);
+	update BankCard set CardMoney-=@money where AccountId=@id;
+	set @myerr+=@@ERROR
+	insert into CardExchange values(@cardno,@money,0,getdate());
+	set @myerr+=@@ERROR
+	if (@myerr = 0)
+	begin
+		commit transaction
+	end
+	else
+	begin
+		rollback transaction
+	end
+--刘备向张飞转账1000元，(添加check约束，设置账户余额必须>=0)
+	begin transaction
+		declare @false int=0
+		declare @money1 decimal(13,2)=1000,
+				@outid varchar(50)=(select AccountId from AccountInfo where RealName='刘备'),
+				@inid varchar(50)=(select AccountId from AccountInfo where RealName='张飞')
+		declare
+				@outcard varchar(50)=(select cardno from BankCard where AccountId=@outid ),
+				@incard varchar(50)=(select cardno from BankCard where AccountId=@inid )
+		update BankCard set CardMoney+=@money1 where AccountId=@inid
+		set @false+=@@ERROR
+		update BankCard set CardMoney-=@money1 where AccountId=@outid
+		set @false+=@@ERROR
+		insert into CardTransfer values(@outcard,@incard,@money1,GETDATE())
+		set @false+=@@ERROR
+	if(@false=0)
+		begin
+		commit transaction
+		end
+		else
+		begin
+		rollback transaction
+	end
\ No newline at end of file
diff --git "a/07 \345\273\226\346\262\273\345\205\210/\347\254\224\350\256\260/2022-9-28\347\254\224\350\256\260 \344\272\213\345\212\241.md" "b/07 \345\273\226\346\262\273\345\205\210/\347\254\224\350\256\260/2022-9-28\347\254\224\350\256\260 \344\272\213\345\212\241.md"
new file mode 100644
index 0000000..01eb65c
--- /dev/null
+++ "b/07 \345\273\226\346\262\273\345\205\210/\347\254\224\350\256\260/2022-9-28\347\254\224\350\256\260 \344\272\213\345\212\241.md"	
@@ -0,0 +1,21 @@
+浜嬪姟锛�
+浜嬪姟鐨勫睘鎬э細ACID
+鍘熷瓙鎬э紙Atomicity锛屾垨绉颁笉鍙垎鍓叉�э級銆佷竴鑷存�э紙Consistency锛夈�侀殧绂绘�э紙Isolation锛屽張绉扮嫭绔嬫�э級銆佹寔涔呮�э紙Durability)
+
+寮�濮嬩簨鍔� begin transaction(鎴栬�卋egin tran)
+declare @false int=0
+鍦ㄥ鍒犳敼鍚巗et @false+=@error
+
+缁撴潫鍒ゆ柇
+--浜嬪姟鎻愪氦锛氬鏋滆鍙ラ兘鎵ц鎴愬姛
+if (@false= 0)
+	begin
+		commit transaction
+	end
+--浜嬪姟鍥炴粴锛氬鏋滀簨鍔′腑鏈変竴鏉¤鍙ユ墽琛屽け璐ワ紝  rollback tran/transaction
+else
+	begin
+		rollback transaction
+	end
+check绾︽潫:
+alter table 浠庤〃 add constraint  check()
\ No newline at end of file
-- 
Gitee