T-SQL:如何在动态SQL中使用参数? [英] T-SQL: How to use parameters in dynamic SQL?
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问题描述
我有以下动态查询,它在没有 WHERE
子句的情况下工作正常,该子句期望 UNIQUEIDENTIFIER
。
I have the following dynamic query which is working fine without the WHERE
clause, which is expecting UNIQUEIDENTIFIER
.
当我将其传递时,没有得到结果。我尝试了 CAST
和 CONVERT
,但没有结果。我可能做错了,有人可以帮忙吗?
When I pass it in, I don't get a result. I tried CAST
and CONVERT
, but no result. I might be doing it wrong, can anybody help?
CREATE PROCEDURE [dbo].[sp_Test1] /* 'b0da56dc-fc73-4c0e-85f7-541e3e8f249d' */
(
@p_CreatedBy UNIQUEIDENTIFIER
)
AS
DECLARE @sql NVARCHAR(4000)
SET @sql ='
DECLARE @p_CreatedBY UNIQUEIDENTIFIER
SELECT
DateTime,
Subject,
CreatedBy
FROM
(
SELECT
DateTime, Subject, CreatedBy,
ROW_NUMBER() OVER(ORDER BY DateTime ) AS Indexing
FROM
ComposeMail
WHERE
CreatedBy = @p_CreatedBy /* <--- the problem is in this condition */
) AS NewDataTable
'
EXEC sp_executesql @sql
推荐答案
必须将参数传递给sp_executesql。 有关详细信息,请参见MSDN 。
You must pass in the parameters to sp_executesql. See MSDN for details.
...
WHERE
CreatedBy = @p
...
EXECUTE sp_executesql @sql, N'@p UNIQUEIDENTIFIER', @p = @p_CreatedBY
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