Plateforme Level Extreme
Abonnement
Profil corporatif
Produits & Services
Support
Légal
English
Set/restore TAG() or ORDER()?
Message
 
 
Information générale
Forum:
Visual FoxPro
Catégorie:
Base de données, Tables, Vues, Index et syntaxe SQL
Divers
Thread ID:
01658087
Message ID:
01658098
Vues:
37
>>I have to change my code, before SCAN, so that the SCAN would go through all records. Therefore, I will need to SET ORDER TO before the SCAN.
>>What is a better practice, saving TAG() to the memory variable and then restoring it (by SET ORDER TO TAG(cSavedTag)).
>>Or, saving the ORDER() to the memory variable and then restoring it (by SET ORDER TO (cSavedOrder)
>>?
>
>Depending on the situation you could do a query on the cursor and use the query for the scan instead. If the cursor is buffered and changes are pending use WITH (BUFFERING = .T.)
>
>SELECT * FROM OriginalCursor WITH (BUFFERING = .T.) ORDER BY MyField INTO CURSOR cuTest NOFILTER READWRITE
>
>To save resources select only those fields you really need in the scan. If you need to do changes in the original cursor, you can locate those during the scan
>
>SELECT cuTest
>SCAN
> SELECT OriginalCursor
> LOCATE FOR IndexField = cutest.IndexField && Better a seek if you have an index.
> SELECT cuTest
>ENDSCAN

Thank you.
"The creative process is nothing but a series of crises." Isaac Bashevis Singer
"My experience is that as soon as people are old enough to know better, they don't know anything at all." Oscar Wilde
"If a nation values anything more than freedom, it will lose its freedom; and the irony of it is that if it is comfort or money that it values more, it will lose that too." W.Somerset Maugham
Précédent
Répondre
Fil
Voir

Click here to load this message in the networking platform