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我正在处理一个似乎不起作用的搜索查询。 完整的查询是：编写一个可怕的SQL搜索查询
set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
go
ALTER PROCEDURE [dbo].[usp_Item_Search]
@Item_Num varchar(30) = NULL
,@Search_Type int = NULL
,@Vendor_Num varchar(10) = NULL
,@Search_User_ID int = NULL
,@StartDate smalldatetime = NULL
,@EndDate smalldatetime = NULL
AS
DECLARE @SQLstr as nvarchar(4000)
Set @SQLstr = 'SELECT RecID, Vendor_Num, Vendor_Name, InvoiceNum, Item_Num,
(SELECT CONVERT(VARCHAR(11), RecDate, 106) AS [DD MON YYYY]) As RecDate, NeedsUpdate, RecAddUserID FROM [tbl_ItemLog] '
IF (@Item_Num IS NOT NULL)
Begin
If @Search_Type = 0
BEGIN
Set @SQLstr = @SQLstr + 'WHERE Item_Num LIKE ''' + @Item_Num + '%'''
END
If @Search_Type = 1
BEGIN
Set @SQLstr = @SQLstr + 'WHERE Item_Num LIKE ''%' + @Item_Num + '%'''
END
If @Search_Type = 2
BEGIN
Set @SQLstr = @SQLstr + 'WHERE Item_Num LIKE ''%' + @Item_Num + ''''
END
End
IF (@Vendor_Num IS NOT NULL)
Begin
Set @SQLstr = @SQLstr + ' AND Vendor_Num = ''' + @Vendor_Num + ''''
End
IF (Search_User_ID IS NOT NULL)
Begin
Set @SQLstr = @SQLstr + ' AND RecAddUserID = ' + convert(nvarchar(20),@Search_User_ID)
End
Set @SQLstr = @SQLstr + ' AND (RecDate BETWEEN ''' + convert(nvarchar(10),@StartDate,101) + ''' AND ''' + convert(nvarchar(10),@EndDate,101) + ''')'
PRINT (@SQLstr)
--Execute (@SQLstr)
当我通过paramters到查询，如果Vendor_Num值为空，从打印输出（@SQLstr）是
SELECT RecID, Vendor_Num, Vendor_Name, InvoiceNum, Item_Num,
(SELECT CONVERT(VARCHAR(11), RecDate, 106) AS [DD MON YYYY]) As RecDate,
NeedsUpdate, RecAddUserID FROM [tbl_ItemLog] WHERE Item_Num LIKE '2200%'
**AND Vendor_Num = ''** AND RecAddUserID = 2 AND (RecDate BETWEEN '01/01/2001'
AND '12/12/2002')
我想要的输出是是：
SELECT RecID, Vendor_Num, Vendor_Name, InvoiceNum, Item_Num,
(SELECT CONVERT(VARCHAR(11), RecDate, 106) AS [DD MON YYYY]) As RecDate,
NeedsUpdate, RecAddUserID FROM [tbl_ItemLog] WHERE Item_Num LIKE '2200%'
AND RecAddUserID = 2 AND (RecDate BETWEEN '01/01/2001' AND '12/12/2002')
我怎样组织查询，所以如果帕拉姆值是空白的，它不显示的字段。