对于字符串向smalldatetime转换失败问题的解决

2022-08-26 20:18:06 浏览数 (1)

大家好,又见面了,我是你们的朋友全栈君。此类问题一般出现于动态存储过程,我以up_selectTradeInfo为例简单说明该问题的解决方法

–建表

–银行卡表

GO

USE BankCardManageDB

GO

IF EXISTS (SELECT * FROM sys.objects WHERE NAME=’BankCard’)

DROP TABLE BankCard

CREATE TABLE BankCard

(

ID int identity(1,1),

CardID char(10) PRIMARY KEY,

BankName varchar(20) NOT NULL,

UserName varchar(20) NOT NULL,

Deposit money NOT NULL DEFAULT(0),

Payout money NOT NULL DEFAULT(0)

)

GO

–交易记录表

USE BankCardManageDB

IF EXISTS(SELECT * FROM sys.objects WHERE NAME=’Trade’)

DROP TABLE Trade

CREATE TABLE Trade

(

TradeID BIGINT PRIMARY KEY IDENTITY(1,1),

CardID CHAR(10) FOREIGN KEY REFERENCES BankCard(CardID) NOT NULL,

TradeDate DATETIME NOT NULL,

TradeMoney MONEY CHECK(TradeMoney>0),

TradeType char(8) CHECK(TradeType=’存钱’ or TradeType=’取钱’)

)

GO

–插入测试数据

INSERT INTO BankCard VALUES(‘123456766′,’工商银行’,’田国兴’,2000,200)

INSERT INTO Trade VALUES(‘123456766′,’20080921′,30000,’存钱’)

–创建存储过程 up_selectTradeInfo 查询时间段内卡的交易信息

USE BankCardManageDB

GO

IF EXISTS(SELECT * FROM sys.objects WHERE name=’up_selectTradeInfo’)

DROP PROCEDURE up_selectTradeInfo

GO

CREATE PROCEDURE up_selectTradeInfo

@cardID varchar(10),

@startDate smalldatetime,–时间上限

@endDate smalldatetime –时间下限

AS

BEGIN

DECLARE @sqlStr varchar(300)

SET @sqlStr=’SELECT * FROM Trade WHERE CardID=’ str(@cardID)

’ AND TradeDate BETWEEN ‘ @startDate ’ AND ‘ @endDate

EXEC(@sqlStr)

END

exec up_selectTradeInfo ‘123456766’,’20080920′,’20080921′

在执行存储过程时,发生以下错误

消息 295,级别 16,状态 3,过程 up_selectTradeInfo,第 11 行

将字符串转换为 smalldatetime 数据类型时失败。

具体解决办法如下:

把存储过程里面的SET @sqlStr一句改为(嵌套转换)

SET @sqlStr=’SELECT * FROM Trade WHERE CardID=’ str(@cardID)

’ AND TradeDate BETWEEN CONVERT(SMALLDATETIME,’ ”” CONVERT(VARCHAR,@startDate,112) ”” ’,120)’

’ AND CONVERT(SMALLDATETIME,’ ”” CONVERT(VARCHAR,@endDate,112) ”” ’,120)’

(注意:在数据类型为datetime时最好不要使用那个BETWEEN)

再执行

exec up_selectTradeInfo ‘123456766’,’20080920′,’20080921′

返回

TradeID CardID TradeDate TradeMoney TradeType

——————– ———- ———————– ——————— ———

18 123456766 2008-09-21 00:00:00 30000.00 存钱

(1 行受影响)

问题解决!!

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