1.什么是事务
2.事务的特性
3.事务的分类
4.事务的创建
5.案例代码：
示例1：使用事务回滚有错误的数据
use StudentManager
go
declare @errorSum int --定义变量，用于累计事务执行过程中的错误
set @errorSum=0 --初始化为0，即无错误
begin transaction
begin
update CardAccount set CurrentMoney=CurrentMoney-1000
where StudentId=100001
set @[email protected][email protected]@error --累计是否有错误
update CardAccount set CurrentMoney=CurrentMoney+1000
where StudentId=100002
set @[email protected][email protected]@error --累计是否有错误
if(@errorSum>0)
rollback transaction
else
commit transaction
end
go
--查询余额
select Students.StudentId,StudentName,CurrentMoney from Students
inner join CardAccount on Students.StudentId=CardAccount.StudentId
示例2：启用事务的存储过程
use StudentManager
go
if exists(select * from sysobjects where name='usp_TransferAccounts')
drop procedure usp_TransferAccounts
go
create procedure usp_TransferAccounts
@inputAccount int,--转入账户
@outputAccount int,--转出账户
@transferMoney int --交易金额
as
declare @errorSum int
set @errorSum=0
begin transaction
begin
update CardAccount set [email protected]
where [email protected]
set @[email protected][email protected]@error
update CardAccount set [email protected]
where [email protected]
set @[email protected][email protected]@error
if(@errorSum>0)
rollback transaction
else
commit transaction
end
go
--测试失败的转账
exec usp_TransferAccounts 100002,100001,1000
--查询余额
select Students.StudentId,StudentName,CurrentMoney from Students
inner join CardAccount on Students.StudentId=CardAccount.StudentId
--测试成功的转账
exec usp_TransferAccounts 100002,100001,800
--查询余额
select Students.StudentId,StudentName,CurrentMoney from Students
inner join CardAccount on Students.StudentId=CardAccount.StudentId