T-SQL:如何在动态SQL中使用参数?

时间:2009-06-24 06:46:11

标签: sql sql-server tsql dynamic-sql

我有以下动态查询在没有WHERE子句的情况下工作正常,期望UNIQUEIDENTIFIER

当我传入时,我没有得到结果。我尝试了CASTCONVERT,但没有结果。我可能做错了,有人可以帮忙吗?

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

4 个答案:

答案 0 :(得分:24)

您必须将参数传递给sp_executesql。 See MSDN for details

...
 WHERE 
    CreatedBy = @p
...

EXECUTE sp_executesql @sql, N'@p UNIQUEIDENTIFIER', @p = @p_CreatedBY

答案 1 :(得分:3)

DECLARE @ParmDefinition NVARCHAR(500)
SET @ParmDefinition = '@p_CreatedBy UNIQUEIDENTIFIER'

EXEC sp_executesql @sql, @ParmDefinition, @p_CreatedBy = @p_CreatedBy

答案 2 :(得分:2)

多个参数语法。也许这样可以为某人节省额外的Google搜索:

exec sp_executesql 
    @qry, 
    N'@value1 int, @value2 int, @currentValue int', 
    @value1 = @value1, @value2 = @value2, @currentValue = @currentValue

答案 3 :(得分:0)

我不确定您的变量是以字符串格式还是二进制格式填充,但您可能需要在where子句中引用uniqueidentifier。如果您只选择uniqueidentifier字段,它是以字符串还是二进制形式返回?