Plateforme Level Extreme
Abonnement
Profil corporatif
Produits & Services
Support
Légal
English
SET FILTER TO x RELATION
Message
De
14/05/2007 06:50:21
Cetin Basoz
Engineerica Inc.
Izmir, Turquie
 
 
À
13/05/2007 03:00:16
Suhas Hegde
Dental Surgeon
Sirsi, Inde
Information générale
Forum:
Visual FoxPro
Catégorie:
Base de données, Tables, Vues, Index et syntaxe SQL
Divers
Thread ID:
01224893
Message ID:
01225164
Vues:
14
>>Set filter is greatly enhanced but I still keep it in my "commands not to use list":)
>
>why may i know ? and what is the alternative? SQL joins?
>
>any specific conditions where it leads to errors ?
>
>Thanx
>suhashegde

There are reasons more than I'd list here:
1) Performance, no matter how much it's enhanced still not as performant as other ways.
2) Reliability. With undeterministic expressions + a grid you might end with something that would make you cry "what's happening". Visually it happens and hard to solve.
3) Record pointer movement. Where it's really. You generally think where it should be but be carefull.
4) No good reason to use.

SQL (or views which is basically just another SQL) is one but not my preference. If you can do it, then traditional xBase relations and set key to is the simpliest and fastest. Not always you have a chance that way, then SQL or View might be required.

A simple demo filter expression could be:

set filter to order_date = date()

It sounds to be very innocent, isn't it:) Beware that's an evil.
Cetin
Çetin Basöz

The way to Go
Flutter - For mobile, web and desktop.
World's most advanced open source relational database.
.Net for foxheads - Blog (main)
FoxSharp - Blog (mirror)
Welcome to FoxyClasses

LinqPad - C#,VB,F#,SQL,eSQL ... scratchpad
Précédent
Suivant
Répondre
Fil
Voir

Click here to load this message in the networking platform