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Break apart a large query
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À
18/04/2001 21:32:34
Cindy Winegarden
Duke University Medical Center
Durham, Caroline du Nord, États-Unis
Information générale
Forum:
Visual FoxPro
Catégorie:
Client/serveur
Divers
Thread ID:
00497076
Message ID:
00497101
Vues:
13
>I build a local cursor or table and keep appending each batch until I have all the data.

Sounds like what I would want to do... Are you able to do other processing while fetching these batches? (I don't want to have foxpro go off into never/never land while waiting for results...)

Could you post some code on how to do this ?
Thanks,
-- Chris

>Remember, for me this is ad hoc, not inside an app. One thing is to save the >data to a table instead of a cursor so you have a way to start over from part >way through. Maybe save the name of the temp table so you can delete it when >you're all done.
>
>My queries don't return all that much data, but sometimes take several hours to run and cover several years worth of data.
>
>I've also learned to run them overnight, or while I'm doing something else.
>
>>Cindy,
>>
>>Thank you for the quick reply.
>>
>>Yes, in fact I do have a delimiting feature already built in, but that is for the user to set. However I am writing this as a generic class where I can not know what the data will look like before hand, so I can not make those kinds of guesses.
>>
>>I guess what it comes down to is, I need a way of returning a cursor on it's own thread???
>>
>>-- Chris
>>
>>
>>>Chris,
>>>
>>>When I do large ad hoc SQL Pass-through queries I usually adjust the WHERE clause to get a few months of data at a time. You could also do a few letters of the alphabet if the data is alphabetical.
>>>
>>>
>>>
>>>>Hi everyone.
>>>>
>>>>I have come across a situation where I need to background fetch a large result set (1.2 million records or more) from SQL Server...
>>>>
>>>>Is there some combination of asynchronous, batch mode on/off and SQLMoreResults that will let me break apart the query and come back with manageable chunks at a time?
>>>>
>>>>Thanks for your help.
>>>>-- Chris
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