asp.net – ‘/’应用程序中的服务器错误无法将char值转换为money

2019年8月6日 300次阅读

我正在运行以下存储的precedure.

结果集在gridView控件上绑定.

@EmbossLine varchar(20),

@TransactionTypeID int,

@DateFrom datetime,

@DateTo datetime

AS

Select 

pt.TransactionDate,
m.MerchantName1,
pt.TerminalID,
pt.SequenceNumber,
tt.TransactionType,
case TT.TransactionTypeID when 0 then PT.TotalAmount else 'null' end 'PointsEarned',
case TT.TransactionTypeID when 2 then PT.TotalAmount else 'null' end 'PointsRedemeed'
from POS_Transactions PT 
inner join TransactionType TT on TT.TransactionTypeID = PT.TransactionTypeID
inner join CardBalance CB on CB.PAN = PT.PAN
inner join Terminal T on T.TerminalID = PT.TerminalID
inner join Merchant M on M.MerchantID = T.MerchantID
where 
(PT.TransactionDate>=@DateFrom and PT.TransactionDate<=@DateTo)
and (PT.TransactionTypeID = @TransactionTypeID or @TransactionTypeID ='-999')
and(PT.PAN=@EmbossLine or PT.PAN='-999')
order by PT.TransactionDate desc

实际上我想要做的是,每当我的TransactionTypeID不等于0或2时我想打印null但是它会抛出一个运行时异常

Cannot convert a char value to money. The char value has incorrect syntax.

我知道这是一个转换问题,想要知道当条件评估为false时如何打印一些值

最佳答案 改变这两行：

case TT.TransactionTypeID when 0 then PT.TotalAmount else 'null' end 'PointsEarned',
case TT.TransactionTypeID when 2 then PT.TotalAmount else 'null' end 'PointsRedemeed'

对此：

case TT.TransactionTypeID when 0 then PT.TotalAmount else null end 'PointsEarned',
case TT.TransactionTypeID when 2 then PT.TotalAmount else null end 'PointsRedemeed'

您希望在其他条件中生成空值.您当前正在生成单词’null’,这是转换失败的地方 – 您无法将单词(char数据类型)’null’转换为money数据类型.

编辑：

您需要将值强制转换为字符串才能执行此操作.但这意味着不是将money数据类型返回给您的客户端,而是返回一个字符串.

这种事情应该在客户端而不是在SQL Server中处理.在任何情况下尝试将所有内容转换为字符串：

case TT.TransactionTypeID when 0 then Cast(PT.TotalAmount as varchar(50)) else 'null' end 'PointsEarned',
case TT.TransactionTypeID when 2 then Cast(PT.TotalAmount as varchar(50)) else 'null' end 'PointsRedemeed'
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