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Using Locate For from Bottom To Top
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À
03/06/2014 09:02:53
Information générale
Forum:
Visual FoxPro
Catégorie:
Codage, syntaxe et commandes
Versions des environnements
Visual FoxPro:
VFP 9 SP2
OS:
Windows XP SP3
Network:
Windows XP
Database:
Visual FoxPro
Application:
Desktop
Divers
Thread ID:
01601100
Message ID:
01601233
Vues:
50
>>>>Hi,
>>>>
>>>>LOCATE FOR Command Scans for records from Top to Bottom by defauld
>>>>
>>>>Is it possible to Locate records in reverse Direction. If yes, kindly Guide how to do this. If not, what's the alternative, if I have ample number of records.
>>>>
>>>>Regards
>>>>Harsh
>>>
>>>It might be very slow this way.
>>>INDEX ON 'A' TAG XATAG
>>>SET ORDER TO XATAG DESCENDING
>>>LOCATE FOR ...
>>>
>>>
>>>What sequence do you really need? The sequence should be based on fields in the table, not record #. With such fields, you can SET ORDER TO sequence ASC/DESC, SEEK(), SCAN WHILE. Allowing you to process not only the entire set, but also subsets very fast.
>>
>>Personally I wonder why anyone still uses LOCATE at all. Pretty prehistoric.
>
>Except that since it's Rushmore-optimizable, very handy when you need to search based on multiple criteria.
>

I know it's Rushmore optimizable. My point was more that it is record based, not set based, which went out about 20 years ago.
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