Plateforme Level Extreme
Abonnement
Profil corporatif
Produits & Services
Support
Légal
English
Detecting field presence in dbf
Message
 
 
À
27/07/2007 13:34:27
Mike Yearwood
Toronto, Ontario, Canada
Information générale
Forum:
Visual FoxPro
Catégorie:
Codage, syntaxe et commandes
Versions des environnements
Visual FoxPro:
VFP 9 SP1
Database:
Visual FoxPro
Divers
Thread ID:
01244177
Message ID:
01244179
Vues:
26
>Hey all
>
>Some time ago I think Fabio Lunardon demonstrated using fsize to check for the presence of a field. What thread was that? I can't find it though I looked.
>
>Considering the need to manage SET COMPATIBLE for a UDF to use FSIZE I can't see it being the fastest way.
>
>I have used a UDF based on TYPE() and it is faster than a UDF using FSIZE that also handles setting and resetting SET COMPATIBLE. I think I found FIELD() is faster.
>
>There is another consideration. Using a UDF can be slow, so using an idea that is in my FoxPro Advisor article: http://advisor.com/doc/17440, the command that can detect a field with the fewest external dependencies could be directly injected into code. It seems the easiest and fastest is to use FIELD().
>
>Did FIELD() always accept the fieldname and alias?

Did you mean this thread Re: Verify if a field already exists in a table Thread #1238247 Message #1238254 ?

Or something else?
If it's not broken, fix it until it is.


My Blog
Précédent
Suivant
Répondre
Fil
Voir

Click here to load this message in the networking platform