How to use dynamic 'order by' in a table-valued function

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SQL-Server-2014

I use a table-valued function as a parametered view. Almost everything works, except the order by part.I altered the original function into this short one.

The function:

ALTER FUNCTION [dbo].[fn_Get_NormalOrders]
(	
	@minimalLevel int,
	@recordStart int,
	@recordsEnd int,
	@orderBy varchar(30)
)
RETURNS TABLE 
AS
RETURN 
(
	select * 
		from
		(
			select 
				ROW_NUMBER() over (order by @orderBy) as row
				,d.nameModel
				,t.idToner
			from toner t
				inner join vwWebDevice d on d.idDevice = t.idDevice 
					and d.statusDevice not like '%stale%'
					and isnull(d.deleted,0) = 0
				inner join groups g on g.idGroup = d.idGroup

			where 
				t.currentLevel <= @minimalLevel

		) as x
	where x.row between @recordStart and @recordsEnd
)

What I have tried:

I found a solution by making a varchar of this query and execute this, but how do i return te result? When i use it as it is now, than the result is always the same.

Posted 12-Apr-17 0:46am

Member 10761632

Updated 12-Apr-17 2:08am

v3

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CHill60 12-Apr-17 7:26am

It's my understanding that you cannot execute dynamic sql from inside a function. What are you actually trying to achieve?

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Member 10761632 · Accepted Answer · 2017-04-12T02:08:00

I want to sort the result by column via a PHP webportal. At first i had a heavy query in the script (i made it very short for this topic), but i wanted to put the heavy logic on the SQL server. Something like a view with lots of logic in it. I got everything in except the table sort (and also the very important paging).

I found the solution ( with a little bit of help :-) ). Instead of convert the query to text, than alter the sting and than excute it, i used a case. I had to add a extra sort afterwards because the result was not sorted on the row.

I can now use the function like:

select * from dbo.fn_Get_NormalOrders(40,5,30,'nameModel') order by row

select *
    from
    (
        select
            case @orderBy
                when 'nameModel' then ROW_NUMBER() over (order by d.nameModel)
                when 'idToner' then ROW_NUMBER() over (order by t.idToner)
                else ROW_NUMBER() over (order by t.DTE)
            end as [row]
            ,d.nameModel
            ,t.idToner
        from toner t
            inner join vwWebDevice d on d.idDevice = t.idDevice
                and d.statusDevice not like '%stale%'
                and isnull(d.deleted,0) = 0
            inner join groups g on g.idGroup = d.idGroup

        where
            t.currentLevel <= 20

    ) as x
where x.row between 1 and 20