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DOEVENTS in SQL

Posted on 2004-08-04
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Last Modified: 2012-05-05
Hi,

anyone know of a DOEVENTS type command in SQL Server?

For info, this is to allow processor time to catch-up while processing OA objects.

bukko
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Question by:bukko
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Expert Comment

by:Hilaire
ID: 11715702
There is no event handling in SQL Server, at least not the same kind of events(mousemove, keypress, paint, activate) than in client applications in which you'd use DoEvents in VB.

The only "events" in SQL server are, unless I'm wrong, the INSERT, UPDATE, DELETE events that fire triggers.
You can disable and enable triggers using alter table ....

COuld you be more precise on what you want to achieve ?
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Author Comment

by:bukko
ID: 11715779

I'm calling a method in an OA object, then reading an IsRunning type property, which contantly returns 1 (Yes).
I'm wondering if this is because it doesn't have time to do what it needs because of being contanly polled.
If I build the object into an exe and call using xp_cmdshell, all works fine. However, I'm not allowed access to xp_cmdshell for security reasons.
So, what I need is a way to release processor time so the component can get on with its life without me bothering it too much.

Any ideas?

bukko
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LVL 26

Accepted Solution

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Hilaire earned 2000 total points
ID: 11715808
If you use the OA objects in a loop,

I think (not sure but it's worth a try) the issuing a
WAITFOR DELAY '00:00:01'
inside the loop
will leave a little CPU time (1 sec) for other processes

If it's the OA objects that take CPU time and don't leave enough for SQL Server to handle client requests properly, I'm afraid there's not much you can do.

Can you post your code ?
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LVL 8

Author Comment

by:bukko
ID: 11715833
I'll try the WAITFOR thing; if that doesn't work I'll post my code.

Ta...
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Author Comment

by:bukko
ID: 11715986
Hilaire,

I think your logic is ok, but it still aint working. Maybe it's not a CPU thing at all.

The component is a PDF creating component.
My SQL code as follows:

      -- Check if object busy
      EXEC      @result      = master.dbo.sp_OAGetProperty @h_pdf, 'StillRunning', @running OUT
      IF (@@ERROR|@result > 0)
            RAISERROR('Unable to read StillRunning property', 16, 1)

      WHILE      @running = 1
            BEGIN
            WAITFOR DELAY '00:00:01'
            EXEC      @result      = master.dbo.sp_OAGetProperty @h_pdf, 'StillRunning', @running OUT
            IF (@@ERROR|@result > 0)
                  RAISERROR('Unable to read StillRunning property', 16, 1)
            PRINT @running
            END

      EXEC      @result      = master.dbo.sp_OADestroy 16711422
      IF (@@ERROR|@result > 0)
            RAISERROR('Unable to destroy PDF component', 16, 1)


Any ideas?
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Expert Comment

by:Hilaire
ID: 11716015
the "createObject" or sp_OACreate should return an INT value @h_pdf

You should use this handle to destroy the object
Instead, you use a hard-coded 16711422

Is it a typo ?

it should be

EXEC     @result     = master.dbo.sp_OADestroy @h_pdf

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LVL 8

Author Comment

by:bukko
ID: 11716073
Yeah, that's just my test snip.
I do normally use @h_pdf
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LVL 8

Author Comment

by:bukko
ID: 11716478
I wrapped the PDf component in an ActiveX dll and it works fine now.

I'm giving you the points for your suggestion, which is actually what I asked for!

Thanks.

bukko
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