Question

Dynamic SQL and EXEC sp_executesql - incorrect calling

Asked by: smacca

Hi,

I have a piece of dynamic sql I need to run that returns a COUNT of all records in a resultset.
The count must be retreived from the dyanmic sql and allocated to the OUTPUT parameter of the stored procedure (responsible for executing the dynamic sql)

I am totally confident, my declaration for:

 EXEC sp_executesl

is not correct - it must return the count from the dynamics sql.


Any help would be appreciated.

Thanks for your time.

CREATE PROCEDURE [dbo].[SelectCountTravelOfferSearchBy]
 
	-- search text
	@SearchText varchar(50) ,
 
	-- foreign key, index and bit columns
	@TravelCenterID varchar(20) = NULL,
	@TravelTypeID varchar(10) = NULL,
	@TourTypeID varchar(20) = NULL,
	@AccommodationTypeID varchar(20) = NULL,
	@RatingTypeID varchar(10) = NULL,
	@BookingTypeID varchar(10) = NULL,
	@RegionID varchar(20) = NULL,
	@SupplierID varchar(20) = NULL,
	@IsSpecialOffer bit = NULL,
	@IsActive bit = NULL,
	
	-- item count
	@ItemCount bigint OUTPUT ,
	
	-- sort expressions
	@SortBy varchar(50) = 'OrderIndex' ,
	@SortDirection varchar(4) = 'ASC'
 
AS
 
	-- turn off rows affected
	SET NOCOUNT ON
			
	--isolation level
	SET TRANSACTION ISOLATION LEVEL READ COMMITTED
 
	-- system function stores
	DECLARE 
		@ErrStatus int, 	-- stores error status
		@RowsAffected int	-- stores number of rows affected		
 
	/* ------------------------------------------------------------- 
 	 * Resultset containing record count.
	 * ------------------------------------------------------------- */	
	DECLARE @Count int
	SET @Count = 0 -- initialise count
 
 
	-- dynamic sql params
	DECLARE @MyItemCount int
	SET @MyItemCount = 0 -- initialise count
 
 
	DECLARE @MySql nvarchar(4000)
	SET @MySql = '
	SELECT
		@MyItemCount = ISNULL(COUNT(*),0)
	FROM 
		[dbo].[TravelOffers]
		LEFT OUTER JOIN [dbo].[AccommodationTypes] ON [dbo].[TravelOffers].[AccommodationTypeID] = [dbo].[AccommodationTypes].[AccommodationTypeID]
		INNER JOIN [dbo].[TravelTypes] ON [dbo].[TravelOffers].[TravelTypeID] = [dbo].[TravelTypes].[TravelTypeID]
		INNER JOIN [dbo].[TravelCenters] ON [dbo].[TravelOffers].[TravelCenterID] = [dbo].[TravelCenters].[TravelCenterID]
		LEFT OUTER JOIN [dbo].[Regions] ON [dbo].[TravelOffers].[RegionID] = [dbo].[Regions].[RegionID]
		LEFT OUTER JOIN [dbo].[Suppliers] ON [dbo].[TravelOffers].[SupplierID] = [dbo].[Suppliers].[SupplierID]
		INNER JOIN [dbo].[RatingTypes] ON [dbo].[TravelOffers].[RatingTypeID] = [dbo].[RatingTypes].[RatingTypeID]
		INNER JOIN [dbo].[BookingTypes] ON [dbo].[TravelOffers].[BookingTypeID] = [dbo].[BookingTypes].[BookingTypeID]
		LEFT OUTER JOIN [dbo].[TourTypes] ON [dbo].[TravelOffers].[TourTypeID] = [dbo].[TourTypes].[TourTypeID]
		'
 
	--Where clause
	BEGIN
		SET @MySql = @MySql + 'WHERE
		'
	END
	
	--TravelCenterID
	IF (@TravelCenterID IS NOT NULL)
	BEGIN
		IF (@Count > 0) SET @MySql = @MySql + ' AND '
		SET @MySql = @MySql + '[dbo].[TravelOffers].[TravelCenterID] = ''' + @TravelCenterID + '''' 
		SET @Count = @Count + 1
	END
	
	--TravelTypeID
	IF (@TravelTypeID IS NOT NULL)
	BEGIN
		IF (@Count > 0) SET @MySql = @MySql + ' AND '
		SET @MySql = @MySql + '[dbo].[TravelOffers].[TravelTypeID] = ''' + @TravelTypeID + '''' 
		SET @Count = @Count + 1
	END
	
	--TourTypeID
	IF (@TourTypeID IS NOT NULL)
	BEGIN
		IF (@Count > 0) SET @MySql = @MySql + ' AND '
		SET @MySql = @MySql + '[dbo].[TravelOffers].[TourTypeID] = ''' + @TourTypeID + '''' 
		SET @Count = @Count + 1
	END
	
	--AccommodationTypeID
	IF (@AccommodationTypeID IS NOT NULL)
	BEGIN
		IF (@Count > 0) SET @MySql = @MySql + ' AND '
		SET @MySql = @MySql + '[dbo].[TravelOffers].[AccommodationTypeID] = ''' + @AccommodationTypeID + '''' 
		SET @Count = @Count + 1
	END
	
	--RatingTypeID
	IF (@RatingTypeID IS NOT NULL)
	BEGIN
		IF (@Count > 0) SET @MySql = @MySql + ' AND '
		SET @MySql = @MySql + '[dbo].[TravelOffers].[RatingTypeID] = ''' + @RatingTypeID + '''' 
		SET @Count = @Count + 1
	END
	
	--BookingTypeID
	IF (@BookingTypeID IS NOT NULL)
	BEGIN
		IF (@Count > 0) SET @MySql = @MySql + ' AND '
		SET @MySql = @MySql + '[dbo].[TravelOffers].[BookingTypeID] = ''' + @BookingTypeID + '''' 
		SET @Count = @Count + 1
	END
	
	--RegionID
	IF (@RegionID IS NOT NULL)
	BEGIN
		IF (@Count > 0) SET @MySql = @MySql + ' AND '
		SET @MySql = @MySql + '[dbo].[TravelOffers].[RegionID] = ''' + @RegionID + '''' 
		SET @Count = @Count + 1
	END
	
	--SupplierID
	IF (@SupplierID IS NOT NULL)
	BEGIN
		IF (@Count > 0) SET @MySql = @MySql + ' AND '
		SET @MySql = @MySql + '[dbo].[TravelOffers].[SupplierID] = ''' + @SupplierID + '''' 
		SET @Count = @Count + 1
	END
	
	--IsSpecialOffer
	IF (@IsSpecialOffer IS NOT NULL)
	BEGIN
		IF (@Count > 0) SET @MySql = @MySql + ' AND '
		SET @MySql = @MySql + '[dbo].[TravelOffers].[IsSpecialOffer] = ' + CAST(@IsSpecialOffer AS varchar) 
		SET @Count = @Count + 1
	END
	
	--IsActive
	IF (@IsActive IS NOT NULL)
	BEGIN
		IF (@Count > 0) SET @MySql = @MySql + ' AND '
		SET @MySql = @MySql + '[dbo].[TravelOffers].[IsActive] = ' + CAST(@IsActive AS varchar) 
		SET @Count = @Count + 1
	END
	SET @MySql = @MySql + '
			AND
			(
				-- search filters!
				[dbo].[TravelOffers].[TravelCenterID] LIKE ''%''' + @SearchText + '''%'' OR 
				[dbo].[TravelOffers].[TravelTypeID] LIKE ''%''' + @SearchText + '''%'' OR 
				[dbo].[TravelOffers].[TourTypeID] LIKE ''%''' + @SearchText + '''%'' OR 
				[dbo].[TravelOffers].[AccommodationTypeID] LIKE ''%''' + @SearchText + '''%'' OR 
				[dbo].[TravelOffers].[RatingTypeID] LIKE ''%''' + @SearchText + '''%'' OR 
				[dbo].[TravelOffers].[BookingTypeID] LIKE ''%''' + @SearchText + '''%'' OR 
				[dbo].[TravelOffers].[RegionID] LIKE ''%''' + @SearchText + '''%'' OR 
				[dbo].[TravelOffers].[SupplierID] LIKE ''%''' + @SearchText + '''%'' OR 
				[dbo].[TravelOffers].[OfferTitle] LIKE ''%''' + @SearchText + '''%'' OR 
				[dbo].[TravelOffers].[ShortDescription] LIKE ''%''' + @SearchText + '''%'' OR 
				[dbo].[TravelOffers].[HtmlDescription] LIKE ''%''' + @SearchText + '''%'' OR 
				[dbo].[TravelOffers].[AdultNotes] LIKE ''%''' + @SearchText + '''%'' OR 
				[dbo].[TravelOffers].[ChildNotes] LIKE ''%''' + @SearchText + '''%'' OR 
				[dbo].[TravelOffers].[InfantNotes] LIKE ''%''' + @SearchText + '''%'' OR 
				[dbo].[TravelOffers].[SeniorNotes] LIKE ''%''' + @SearchText + '''%'' OR 
				[dbo].[TravelOffers].[ConcessionNotes] LIKE ''%''' + @SearchText + '''%'' OR 
				[dbo].[TravelOffers].[StudentNotes] LIKE ''%''' + @SearchText + '''%'' OR 
				[dbo].[TravelOffers].[FamilyNotes] LIKE ''%''' + @SearchText + '''%'' OR 
				[dbo].[TravelOffers].[PaymentMethods] LIKE ''%''' + @SearchText + '''%'' OR 
				[dbo].[TravelOffers].[PaymentInstructions] LIKE ''%''' + @SearchText + '''%'' OR 
				[dbo].[TravelOffers].[PaymentTerms] LIKE ''%''' + @SearchText + '''%'' OR 
				[dbo].[TravelOffers].[SpecialNotes] LIKE ''%''' + @SearchText + '''%'' OR 
				[dbo].[TravelOffers].[CancellationPolicy] LIKE ''%''' + @SearchText + '''%'' OR 
				[dbo].[TravelOffers].[Notes] LIKE ''%''' + @SearchText + '''%'' OR 
				[dbo].[TravelOffers].[CreatedBy] LIKE ''%''' + @SearchText + '''%'' OR 
				[dbo].[TravelOffers].[ModifiedBy] LIKE ''%''' + @SearchText + '''%''
			)
	'
 
	-- print sql
	--PRINT(@MySql)
 
 
 
 
 
 
	-- BUG HERE!!!!!!!!!!!!!!!!!!!!!!!! Pretty sure the declaration is wrong. I need to retrieve the @MyItemCount value from the dynamic sql and store it in the procedure output parameter @ItemCount.
	EXEC sp_executesql @MySql, N'@MyItemCount bigint OUTPUT', @ItemCount = @MyItemCount OUTPUT
 
 
 
 
 
	-- check for errors
	IF @ErrStatus <> 0
	BEGIN
		RAISERROR('Error occurred in stored procedure ''[dbo].[SelectCountTravelOfferSearchBy]''', 10, 1)
		RETURN @ErrStatus
	END
 
	-- turn on rows affected
	SET NOCOUNT OFF
 
	-- success(0)
	RETURN 0
 
 
GO

                                  
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Asked On
2008-10-16 at 23:28:33ID23823046
Topics

MS SQL Server

,

SQL Server 2005

Participating Experts
2
Points
500
Comments
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Answers

 

by: NightmanPosted on 2008-10-16 at 23:46:16ID: 22738215

You don't need the extra variable declaration

Change this line:
   @MyItemCount = ISNULL(COUNT(*),0)
to
    @ItemCount = ISNULL(COUNT(*),0)

and this line
   EXEC sp_executesql @MySql, N'@MyItemCount bigint OUTPUT', @ItemCount = @MyItemCount OUTPUT
To
   EXEC sp_executesql @MySql, N'@ItemCount bigint OUTPUT', @ItemCount OUTPUT

 

by: skrilePosted on 2008-10-17 at 04:28:59ID: 22739382

I actually wonder whether you need to do this with Dynamic SQL.  There is a method I've been using a lot lately that seems fast and doesn't involve the (rather fragile) risky business of dynamic sql.  

Let's say you have a webpage that has a search form:

Travel Center {drop down with ID's - with the Select One choice set to a value of zero}
Region {drop down with ID's - again, the top choice value is zero}

Select Count(TravelOffersID)
FROM
{your joined together table structure}
WHERE
      (@TravelCenterID = '0' OR [dbo].[TravelOffers].[TravelCenterID] = @TravelCenterID)
      and (@RegionID = '0' OR [dbo].[TravelOffers].[RegionID] = @RegionID)
      and....
      and
      ( [dbo].[TravelOffers].[TravelCenterID]  LIKE '%' + @SearchText +'%'
        OR [dbo].[TravelOffers].[RegionID] LIKE '%' + @SearchText + '%'
        OR.....
     )



This method doesn't require any If/ Logic or dynamic SQL.  It is very fast and reliable.  You will be amazed at how powerful this WHERE scheme can be.  Basically, you can set up a bare minimum of procedures to cover all sorts of different select requirements.  

 

by: smaccaPosted on 2008-10-17 at 05:27:30ID: 22739804

Would the following sql make sense as well:

SELECT COUNT(TravelOffersID)
FROM
{
  your joined together table structure
}
WHERE(
     1 = 1 OR [dbo].[TravelOffers].[TravelCenterID] = @TravelCenterID)
      and (1 = 1 OR [dbo].[TravelOffers].[RegionID] = @RegionID)
      and....
      and
      ( [dbo].[TravelOffers].[TravelCenterID]  LIKE '%' + @SearchText +'%'
        OR [dbo].[TravelOffers].[RegionID] LIKE '%' + @SearchText + '%'
        OR.....
     )
)


 

by: smaccaPosted on 2008-10-17 at 05:29:36ID: 22739817

Disregard question above. Thanks for your help.

 

by: skrilePosted on 2008-10-17 at 05:29:45ID: 22739820

I don't think you want that 1=1 line there.  That will ensure that ALL rows are returned, which I think is not what you want.

 

by: skrilePosted on 2008-10-17 at 05:31:18ID: 22739835

Ah....disregarding.

But, that 1=1 doesn't check to see if a filter parameter was entered.

 

by: smaccaPosted on 2008-10-17 at 17:31:13ID: 22746519

If my data layer, ensures null values are passed in when the none filter option is selected, would the sql below make sense.


Does this sql, mean that filter parameters are now OPTIONAL and you can filter by any combination.

SELECT 
  COUNT(*)
FROM
{
  your joined together table structure
}
WHERE(
  (@TravelCenterID IS NULL OR [dbo].[TravelOffers].[TravelCenterID] = @TravelCenterID)
  AND (@RegionID IS NULL OR [dbo].[TravelOffers].[RegionID] = @RegionID)
  AND    
  AND    
  AND    
  ( 
    [dbo].[TravelOffers].[TravelCenterID]  LIKE '%' + @SearchText +'%'
    OR [dbo].[TravelOffers].[RegionID] LIKE '%' + @SearchText + '%'
    OR.....
  )
)

                                              
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by: skrilePosted on 2008-10-20 at 04:29:49ID: 22756559

Yep.  And I have had trouble ensuring nulls are passed, depending on what presentation layer you are using, so you can make your @ variables equal to some *thing*.  I've used things like:

 @TravelCenterID = -1

  Or

 @TravelCenterID = 'xxz$$%$%zxx'

 

by: smaccaPosted on 2008-10-20 at 06:00:40ID: 22757195

That is brilliant - I am doing bit logic in all my procedures to figure out the combinations in the where clause.
Your SQL has saved me a alot of work and maintenance on my procedures in the future - thank you.

My Data Access Layer ensures that NULL is passed to the procedure when EMPTY strings are passed for string types, and 0 is passed with int types.


Thanks again for your great input.

 

by: skrilePosted on 2008-10-20 at 07:09:35ID: 22757950

My pleasure.  I stumbled on this a few months back when I was using logic like this:

select ID from table as T where IsNull(@parameter,T.Parameter) = T.Parameter

This works fine, but has one HUGE flaw.  It's slow as hell.  Changing the statement to the examples above allows SQL to bail once it gets a match for the paramenter and not do the other examination.  For the record, thanks Olga!

20120131-EE-VQP-002

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