woops, i guess i forgot to paste the code portion of the email. Yes billy,
definately persistant vars, particularly session vars. I understand the
need to lock, but what he is saying is that since your only doing a lookup
in the session structure, you don't need to lock the
isDefined("session.var"). Is this a true statement?
CODE PORTION OF EMAIL:
<cfif IsDefined("Session.MyVar")> <!--- check it exists --->
<!--- note: this is longhand as you can read variables in an
exclusive --->
<!--- lock but for this example a more verbose demonstration is
needed --->
<!--- read from the variable --->
<cflock scope="session" type="readonly" timeout="10">
<cfset V_MyVar = Session.MyVar>
</cflock>
<!--- write to the variable --->
<cflock scope="session" type="exclusive" timeout="10">
<cfset Session.MyVar = 52>
</cflock>
</cfif>
-----Original Message-----
From: Billy Cravens [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, July 31, 2001 9:55 AM
To: [EMAIL PROTECTED]
Subject: Re: question.
It may do a read, or it may simply be a pointer to memory where existing
variables are defined, with the actual value of the variable in a different
location.
However, I can't understand why you'd need to a lock on a variable read
I'm assuming you're referring to locking persistent-scope variables, like
application). The whole purpose of the lock is to ensure data integrity
(prevent writing to a variable while another user is reading it). However,
this shouldn't be the case with reading a variable.
---
Billy Cravens
HR Web Systems, EDS
[EMAIL PROTECTED]
----- Original Message -----
From: "Hinojosa, Robert A" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Tuesday, July 31, 2001 9:17 AM
Subject: question.
> I received this email on another list and I am almost positive he is
wrong.
> I've read nearly everything there is to know about locking and cf, but I
> wanted to make sure, so I am asking the greats here in this list.
Checking
> for an isDefined("") is actually doing a type of a read, isn't it, so you
> would need a lock around it?
>
> EMAIL:
> Just as a quick note, you don't need to lock variables in an IsDefined("")
> the reason being, you are not reading from it or writing to it.... just
> checking its there.....
>
>
> Robert Hinojosa
> [EMAIL PROTECTED]
> 972.243.4343 x7446
>
>
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