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Strange behavior of Select
Message
De
27/11/2012 05:38:38
 
 
À
27/11/2012 03:49:08
Information générale
Forum:
Visual FoxPro
Catégorie:
Codage, syntaxe et commandes
Versions des environnements
Visual FoxPro:
VFP 9 SP2
OS:
Windows XP SP2
Network:
Windows 2000 Server
Database:
Visual FoxPro
Divers
Thread ID:
01558144
Message ID:
01558147
Vues:
69
>I was just notified of a very strange behavior of the Select command and the Select() function, by Maharastra Kolhapur on Foxite. What he told me, and which I didn't know, was that Select() also performs an implicit Select command "behind the scene" when you supply a work area that is actually used. And even "worse", VFP makes no distinction between Select(myWorkArea) and Select (myWorkArea), note the space, they both are treated as Functions!
>
>Here is a small, slightly modified, excerpt from my message on Foxite. Please read carefully, the impact may be bigger than you immediately think.
>myWorkArea = 'myTable' && myTable is already used in another work area
>1. ?Select(myWorkArea) && Function
>2. ?Select (myWorkArea) && Function or Command? Looks like a command but is treated as a function. 
>3. Select (myWorkArea) && Function or Command? Looks like a command but is treated as a function. 
>
>Note that the only difference between 1 and 2 is the space. I would expect an error on 2.
>And that the only difference between 2 and 3 is the question mark.
>Since we have the "option 3", maybe it's a good thing that Select() also performs an implicit Select command?
>
>I am really grateful for your discovery, which I will keep in mind. Luckily we have the debugger.

Hi Tore,

you can see the first VFP's parser step with NORMALIZE()
? NORMALIZE("Select             (myWorkArea)")
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