Sql server 2008 执行SQL存储过程时转换日期时间错误

我编写了以下存储过程：

GO
/****** Object:  StoredProcedure [dbo].[ReadCounters]    Script Date: 08/17/2011 13:43:12 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO

-- ReadCounters --
ALTER PROCEDURE [dbo].[ReadCounters]
    @type bit,
    @startDate DateTime,
    @endDate DateTime
AS
BEGIN
    DECLARE
    @AllCounterIds NVARCHAR(MAX),
    @Query NVARCHAR(MAX);

    SELECT @AllCounterIds = STUFF((
            SELECT DISTINCT '],[' + CAST([CounterId] AS VARCHAR(32))
            FROM AllCounters
            WHERE [DateTime] > @startDate AND [DateTime] < @endDate AND [Type] = @type
            for xml path('')), 1, 2, '') + ']';

    SET @Query = 'SELECT [DateTime], pvt.* from
                    (SELECT [Type], [DateTime], [Value], [CounterId]
                     FROM AllCounters WHERE CounterId IN 
                        (
                         SELECT DISTINCT([CounterId]) 
                         FROM AllCounters
                         WHERE [DateTime] > '''+ @startDate +''' AND [DateTime] < '''+ @endDate +''' AND [Type] = '+ @type +'
                        ) AND [DateTime] > '''+ @startDate +''' AND [DateTime] < '''+ @endDate +''' AND [Type] = '+ @type +'
                    ) S
                PIVOT
                (
                    SUM (Value)
                    FOR CounterId IN
                    (' + @AllCounterIds + ')
                ) AS pvt;';         
    EXECUTE(@Query);
END

我发现以下错误：

Msg 241, Level 16, State 1, Procedure ReadCounters, Line 19
Conversion failed when converting date and/or time from character string.

任何关于为什么给我错误的建议。如果只执行Select查询，它运行得非常好。

您当然需要格式化它

....
WHERE [DateTime] > '''+ CONVERT(varchar(30), @startDate, 120) +''' AND ...
...

为什么SQL server会猜测您想要连接不同的数据类型

---

错误是因为NVARCHARMAX的优先级低于datetime，根据

我宁愿这样做-节省了大量混乱的转换和红/黑中断，尽管我仍然建议将逗号分隔的ID列表连接起来：

SET @Query = N'SELECT [DateTime], pvt.* from
            (SELECT [Type], [DateTime], [Value], [CounterId]
             FROM AllCounters WHERE CounterId IN 
                (
                 SELECT DISTINCT([CounterId]) 
                 FROM AllCounters
                 WHERE [DateTime] > @startDate AND [DateTime] < @endDate AND [Type] = @type 
                ) AND [DateTime] > @startDate AND [DateTime] < @endDate AND [Type] = @type 
            ) S
            PIVOT
            (
                SUM (Value)
                FOR CounterId IN
                (' + @AllCounterIds + ')
            ) AS pvt;';         

EXEC sp_executesql @query, 
    N'@startDate DATETIME, @endDate DATETIME, @type BIT',
    @startDate, @endDate, @type;

---

仍然得到相同的错误…检查gbn的答案-这有什么帮助吗？@marc_是的gbn的答案是正确的…谢谢。。。还有一件事，不仅需要转换日期，@type也需要转换-->和[type]='+CAST@typeAS CHAR1+'thanks@dvlpr：是的，出于同样的原因。是的，这在某种程度上是好的。。。但是调用这个SPI时，您必须在代码中一直这样做，我不确定您的意思。这段代码进入存储过程，替换集合并执行您现在拥有的集合。您将能够以完全相同的方式继续调用存储过程。我认为没有必要重复存储过程中的所有其他代码，但如果需要，我可以这样做。

SET @Query = N'SELECT [DateTime], pvt.* from
            (SELECT [Type], [DateTime], [Value], [CounterId]
             FROM AllCounters WHERE CounterId IN 
                (
                 SELECT DISTINCT([CounterId]) 
                 FROM AllCounters
                 WHERE [DateTime] > @startDate AND [DateTime] < @endDate AND [Type] = @type 
                ) AND [DateTime] > @startDate AND [DateTime] < @endDate AND [Type] = @type 
            ) S
            PIVOT
            (
                SUM (Value)
                FOR CounterId IN
                (' + @AllCounterIds + ')
            ) AS pvt;';         

EXEC sp_executesql @query, 
    N'@startDate DATETIME, @endDate DATETIME, @type BIT',
    @startDate, @endDate, @type;