在存储过程（参数化）计算中将varchar转换为数值类型的算术溢出错误

Question

我想计算包含增值税，运输成本，总计的总和，同时通过使用@total计算总计来获得将varchar转换为数据类型数值错误的算术溢出错误。如何解决此问题

PROCEDURE   [dbo].[GrandTotal] 
@GrandTotal decimal(10,2)



as
BEGIN

DECLARE @1stQuery AS NVARCHAR(4000)
DECLARE @ParamDefinition AS NVARCHAR(2000)
DECLARE @Total AS decimal (18,12)
DECLARE @vat AS decimal (10,2)
DECLARE @Gtotal AS decimal (10,2)


    set @Total =  'select ((L.Quantity*L.Price)- L.DiscountValue-((O.AllocatedPoint / 100) * O.ExchangeRate))AS Total 
                    FROM [Orders] O 
                   LEFT JOIN [LineItem] L  ON O.[OrderId]  = L.[OrderId]  where L.[StatusCode] IN (''AS'', ''PP'',  ''P'',''PS'',''O'',''OH'',''SC'',''D'', ''GA'',''SW'')'


set @vat = @Total / (100 + 20) * 20;

set @Gtotal =@Total-@vat

set  @1stQuery =  
 ' select   orderid,GrandTotal from (SELECT  O.[OrderId],
     CAST( ROUND((@Gtotal+O.ShippingCost),2)AS DECIMAL(10,2)) AS GrandTotal
    FROM    LineItem L 
             left JOIN [Orders] O  ON O.[OrderId]  = L.[OrderId]
             left join [Country] C on O.[CountryId] = c.[CountryId]
               )as gt where 1=1 
         '


    if @GrandTotal  is not null 

    SET @1stQuery = @1stQuery + 'and  gt.[GrandTotal] = @GrandTotal   ' 


    set @ParamDefinition='@GrandTotal decimal (10,2),@Total decimal(18,12),@Gtotal decimal(10,2),@vat decimal(10,2)
                          '

   EXECUTE sp_Executesql @1stQuery,
                            @ParamDefinition,
                            @GrandTotal,
                            @Total,
                            @Gtotal,@vat


END

Answer 1

您的错误与计算无关，这是因为您已将@total声明为十进制，然后为其分配了字符串值。 您可以使用以下方法重新创建错误：

DECLARE @Total AS decimal (18,12)

set @Total =  'select ((L.Quantity*L.Price)- L.DiscountValue-((O.AllocatedPoint / 100) * O.ExchangeRate))AS Total 
                FROM [Orders] O 
               LEFT JOIN [LineItem] L  ON O.[OrderId]  = L.[OrderId]  where L.[StatusCode] IN (''AS'', ''PP'',  ''P'',''PS'',''O'',''OH'',''SC'',''D'', ''GA'',''SW'')'

哪个产量

Msg 8115，第16级，状态6，第3行

将varchar转换为数值数据类型的算术溢出错误。

就其价值而言，您的查询中还有无数其他错误，或者我看不到其背后的逻辑的操作，但是您尚不清楚要实现的目标，因此，我还无法提出其他选择。 我将指出，尽管根本不需要动态SQL！