c# - 存储过程，传递日期数组，以逗号分隔。转换错误

Question

我正在尝试将以逗号分隔的日期字符串发送到我的存储过程，以在 IN 子句中使用。但是，我收到错误消息“从字符串转换日期和/或时间时转换失败。”

我正在尝试使用这些日期来查找匹配的价格。C#:

 StringBuilder LastDaysOfEveryMonth = new StringBuilder();
 DataAccess da = new DataAccess();
 SqlCommand cm = new SqlCommand();
 cm.CommandType = CommandType.StoredProcedure;
 var pList = new SqlParameter("@DateList", DbType.String);
 pList.Value = LastDaysOfEveryMonth.ToString();
 cm.Parameters.Add(pList);
...
 cm.CommandText = "spCalculateRollingAverage";
 DataSet ds = da.ExecuteDataSet(ref cm);

调试时，传入的字符串值为:

'2013-07-31','2013-08-30','2013-09-30','2013-10-31','2013-11-29','2013-12-31',
'2014-01-31','2014-02-28','2014-03-31','2014-04-03',

使用 DbType String 和 SQLDbType NvarChar。

如有任何建议，我们将不胜感激!数据库:

CREATE PROCEDURE [dbo].[spCalculateRollingAverage] 
@StartDate DateTime,
@EndDate DateTime,
@Commodity nvarchar(10),
@PeakType nvarchar (10),
@BaseID int,
@NumberOfMonths int,
@DateList nvarchar(MAX)  

AS

    BEGIN

    select TermDescription,ContractDate,Price,SortOrder into #tbtp from BaseTermPrice 
    inner hash join Term 
    on 
    Term.TermID = BaseTermPrice.TermID
    where 
    BaseID = @BaseID and ((@PeakType IS NULL and PeakType is null) or 
    (@PeakType IS     NOT NULL and PeakType=@PeakType))
    and ((@DateList IS NULL and ContractDate between @StartDate and @EndDate) 
     or (@StartDate IS NULL and ContractDate in (@DateList)))
    order by
    ContractDate,SortOrder

Answer 1

您不能像这样在 IN 子句中使用 varchar 变量。您必须将其添加到动态 SQL 中才能执行，或者将其拆分为临时表/临时变量。

例如使用这个 SplitString功能你可以做这样的事情:

or (@StartDate IS NULL and ContractDate in 
          (SELECT Name from dbo.SplitString(@DateList))))