T-SQL 事务2

启用事务完成转账存储过程

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 CurrentMoney=CurrentMoney-@transferMoney
                        where StudentId=@outputAccount
            set @errorSum=@errorSum+@@error     
            update CardAccount set CurrentMoney=CurrentMoney+@transferMoney
                        where StudentId=@inputAccount
           set @errorSum=@errorSum+@@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