MSSQL之事务的用法

IF OBJECT_ID('bankInfo') IS NOT NULL

DROP TABLE bankInfo

GO

--银行卡信息表

CREATE TABLE bankInfo

(

uId VARCHAR(18) NOT NULL PRIMARY KEY,--卡号

uName VARCHAR(20), --卡主姓名

uMoney MONEY --卡中余额

)

GO

INSERT INTO bankInfo VALUES('9559901','张三',1)

INSERT INTO bankInfo VALUES('9559902','李四',1000)

INSERT INTO bankInfo VALUES('9559903','王五',800)

INSERT INTO bankInfo VALUES('9559904','赵六',50)

INSERT INTO bankInfo VALUES('9559905','赵明',5)

SELECT * FROM bankInfo

------begin transaction---------开始事务

SET IMPLICIT_TRANSACTIONS ON

DECLARE @myerror INT --用于存储错误号

SET @myerror=0

SET @myerror=@myerror+(select count(*) from bankInfo WHERE uId='9559902' and uMoney<800) --如果帐号余额小于800，则将error+1

UPDATE bankInfo SET uMoney=uMoney-800 WHERE uId='9559902'

SET @myerror=@myerror+@@ERROR --如果产生错误，则将错误号累加

UPDATE bankInfo SET uMoney=uMoney+800 WHERE uId='9559901'

SET @myerror=@myerror+@@ERROR --如果产生错误，则将错误号累加

IF @myerror>0 --如果执行过程出错

BEGIN

PRINT '转账失败,正准备回滚事务！'

ROLLBACK TRANSACTION

END

ELSE --如果过程中没有出现问题

BEGIN

PRINT '转账成功,准备提交事务！'

COMMIT TRANSACTION

END

------end transaction---------结束事务

PRINT '转账后的余额'

SELECT * FROM bankInfo