对于字符串向smalldatetime转换失败问题的解决
云想慕尘 2008-09-24 08:32:52 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!!