T-SQL 事务2

启用事务完成转账存储过程

 1 use StudentManager
 2 go
 3 if exists(select * from sysobjects where name='usp_TransferAccounts')
 4 drop procedure usp_TransferAccounts
 5 go
 6 create procedure usp_TransferAccounts
 7 @inputAccount int,--转入账户
 8 @outputAccount int,--转出账户
 9 @transferMoney int --交易金额
10 as
11     declare @errorSum int 
12     set @errorSum=0      
13     begin transaction
14        begin        
15             update CardAccount set CurrentMoney=CurrentMoney-@transferMoney
16                         where StudentId=@outputAccount
17             set @errorSum=@errorSum+@@error     
18             update CardAccount set CurrentMoney=CurrentMoney+@transferMoney
19                         where StudentId=@inputAccount
20            set @errorSum=@errorSum+@@error 
21            if(@errorSum>0)
22                 rollback transaction
23            else 
24                 commit transaction
25      end    
26 go
27 --测试失败的转账
28 exec usp_TransferAccounts 100002,100001,1000
29 --查询余额
30 select Students.StudentId,StudentName,CurrentMoney from Students
31 inner join CardAccount on Students.StudentId=CardAccount.StudentId
32 --测试成功的转账
33 exec usp_TransferAccounts 100002,100001,800
34 --查询余额
35 select Students.StudentId,StudentName,CurrentMoney from Students
36 inner join CardAccount on Students.StudentId=CardAccount.StudentId