Level Extreme platform
Subscription
Corporate profile
Products & Services
Support
Legal
Français
Cursor fields being truncated at runtime
Message
From
19/01/1999 21:00:22
 
 
To
19/01/1999 20:14:32
Mark Hall
Independent Developer & Voip Specialist
Keston, Kent, United Kingdom
General information
Forum:
Visual FoxPro
Category:
Databases,Tables, Views, Indexing and SQL syntax
Miscellaneous
Thread ID:
00177621
Message ID:
00177864
Views:
34
>>>
>>>Also, rather that using AFIELDS, you could
>>>SELECT * FROM tablename INTO CURSOR cursorname NOFILTER
>>>to get a copy of your original table for reporting.
>>
>>You raise an interesting point here Mark. That sure is a way to create a cursor based on an existing structure. The cursor will contain every record in the original dataset. I often want an empty cursor.
>>You could go
>>SELECT * FROM tablename WHERE .F. INTO CURSOR cursorname NOFILTER
>>however this is not Rushmore optimizable (try it on a huge dataset!)
>>So....
>>Does anyone know a fast one liner for creating an empty cursor based on an existing structure?
>
>Hi David,
>
>For an empty cursor, I think AFIELDS() etc. would definetly be the way to go.
>
>As for something optimizable.... well, it would have to be a WHERE clause based on an index,
>
>WHERE DELETED() = .f. AND DELETED = .t.
>
>maybe.

It seems from my testing today that WHERE .F. and WHERE 1=0 do in fact optimise. I'm getting average times of 0.002 seconds on a 1,500,000 record table over a network. I don't recall this being true in FPW2.6 days.

Regards
Previous
Reply
Map
View

Click here to load this message in the networking platform