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 Reporting Services Development
 Report Parameters and Nulls
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NSalinas
Starting Member

2 Posts

Posted - 04/22/2005 :  14:58:13  Show Profile  Reply with Quote
I am trying to create a drop down list of counties, so that a report can be generated either for the county selected or if the parameter is left NULL, to create a statewide report. I've gone into the Report Parameters Menu and created a stored procedure to give me this list of counties. However when I try to run the report without selecting a county, it will not generate the report. It is not allowing me to select NULL as a value to generate my statewide report, even though I have "Allow Null Value" checked.

Can you help me with allowing a NULL value to be included in my drop down list?!
Thank you,
Nora

jhermiz
Flowing Fount of Yak Knowledge

USA
3564 Posts

Posted - 04/22/2005 :  15:03:22  Show Profile  Visit jhermiz's Homepage  Reply with Quote
That is correct you need to allow for nulls..but you have to change your stored procedure to allow for an 'All' values:


CREATE PROCEDURE rsp_customer_sites @ClientID integer,
					    @CustomerID bigint
AS
SET NOCOUNT ON
SELECT     dbo.ClientCustomerSites.SiteID, dbo.Site.Site
FROM         dbo.ClientCustomerSites INNER JOIN
                      dbo.Site ON dbo.ClientCustomerSites.SiteID = dbo.Site.SiteID
WHERE dbo.ClientCustomerSites.ClientID=@ClientID AND dbo.ClientCustomerSites.CustomerID=@CustomerID
UNION SELECT Null, 'All'
ORDER BY dbo.Site.Site
SET NOCOUNT OFF
GO


Jon


Keeping the web experience alive -- http://www.web-impulse.com
Imperfection living for perfection --
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jhermiz
Flowing Fount of Yak Knowledge

USA
3564 Posts

Posted - 04/22/2005 :  15:07:27  Show Profile  Visit jhermiz's Homepage  Reply with Quote
Thats for the combo box BTW, your resultant stored procedure which the report is based on should have something like this:

...
WHERE (CountryID=@CountryID OR @CountryID IS NULL)

Boolean logic with an or, if the parameter has a value take the left hand side, else take the right hand side.
Dont forget to set @CountryID=NULL as a default parameter.




Keeping the web experience alive -- http://www.web-impulse.com
Imperfection living for perfection --
http://jhermiz.blogspot.com/
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NSalinas
Starting Member

2 Posts

Posted - 04/29/2005 :  17:42:04  Show Profile  Reply with Quote
Thank you Jon, for your help in figuring out my drop down boxes! I got that part of my report working! Yeyy!!!! Thank you!

But now I'm getting the following error:
Procedure expects parameter @BeginDate, which was not supplied, even though the begin and end dates were entered prior to trying to preview my report.

I noticed you had a lengthy discussion with tduggan (from postings in 11/2004)... about a similar problem you were having. But even after reading all of your postings, I am still having problems. :(
I am very new at this and would appreciate any advice you could give me.

This is basically what I have:

Under my DATA tab:
1) Stored Procedure - uses BEGINDATE and ENDDATE parameters.

2) Data Source dsValidRegions - gives me list of valid Regions in
Texas. Code in dsValidRegions =
SELECT DISTINCT Region
FROM TBL_County c
WHERE (Region BETWEEN '01' AND '11')
UNION SELECT ' All'
ORDER BY Region

3) Data Source dsValidCounties - gives me list of valid Counties in
Texas. Code in dsValidCounties =
SELECT DISTINCT CountyName
FROM TBL_County
WHERE (@Region = Region)
UNION SELECT ' All'
ORDER BY CountyName
With @Region listed under the Parameters Menu.

Under my LAYOUT TAB / REPORT PARAMETERS MENU:

1) Parameter Name: BeginDate
Prompt: Begin Date:
Data Type: String
Non-queried:
Default Value: None

2) Parameter Name: EndDate
Prompt: End Date:
Data Type: String
Non-queried:
Default Value: None

3) Parameter Name: Region
Prompt: Region:
Data Type: String, Allow Null Value Checked
From Query: Dataset = dsValidRegions
Value Field = Region
Label Field = Region
Default Value: From Query: Dataset = dsValidRegions
Value Field = Region

4) Parameter Name: CountyName
Prompt: County Name:
Data Type: String, Allow Null Value Checked
From Query: Dataset = dsValidCountyNames
Value Field = CountyName
Label Field = CountyName
Default Value: From Query: Dataset = dsValidCountyNames
Value Field = CountyName

Any help would be greatly appreciated! Thank you.
Nora :)


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jhermiz
Flowing Fount of Yak Knowledge

USA
3564 Posts

Posted - 04/29/2005 :  19:50:55  Show Profile  Visit jhermiz's Homepage  Reply with Quote
Glad to see you got it working. Your other problem is simple, you need to do two things:

1) In your stored procedure you have a parameter for start and end date, make sure you set these parameters with NULL defaults in case the user does not provide one:

In addition...

@StartDate datetime=NULL,
@EndDate datetime=NULL

2) Finally in your reporting services go to your report parameters.
Make sure you have allowed for null values for these parameters.

Jon



Keeping the web experience alive -- http://www.web-impulse.com
Imperfection living for perfection --
http://jhermiz.blogspot.com/
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