It all becomes clear. Thanks a lot.
--Ben Doom
Programmer & General Lackey
Moonbow Software
: -----Original Message-----
: From: Matt Robertson [mailto:matt@;mysecretbase.com]
: Sent: Thursday, October 31, 2002 11:36 PM
: To: CF-Talk
: Subject: RE: client vs. session
:
:
: Session vars are stored in memory (only) and are meant for short-term
: persistent variable storage. You have to CFLOCK them, although there
: have been some changes to this with the advent of CFMX. Your typical
: default session var expires after 20 minutes of inactivity. However,
: assuming the max expiration time has been extended in the CF
: Administrator, you can expire them after a longer period of time.
: Session vars do not scale across a server cluster since they are held in
: a particular server's memory. Session vars are structures, so you have
: the ability to natively store complex values within them, like arrays.
:
: Client variables were intended for longer-term persistent value
: storage... Expiration times measured in days; not minutes. They are
: stored either in the Windows registry (or a facsimile thereof on *nix
: systems), an external database or in cookies. Since they are not stored
: in memory you do not need to CFLOCK them. Client variables are meant to
: hold simple values, and do not natively support the storage of complex
: values like arrays. Since a client var can be stored in a db (or I
: suppose in a cookie) it can be used for persistent storage in a
: clustered server environment.
:
: Client vars can be extended so they expire just like session vars. Put
: something like this in an application.cfm:
:
: <cfset
: variables.VisitChk=DateCompare(DateAdd('n',(20*-1),CreateODBCDateTime(NO
: W())),client.LastVisit)>
: <cfif Compare(variables.VisitChk,"-1")>
: .. Uh oh. 20 minutes of inactivity have passed.
: Delete the user's cvars...
: </cfif>
:
: Using WDDX you can even use them to store complex structures if needed.
: That tutorial I mentioned in another thread (at http://halhelms.com)
: will spell all that out, and explain the expiration thingie I copied,
: above.
:
: What did I miss?
:
: --Matt Robertson--
: MSB Designs, Inc.
: http://mysecretbase.com
:
:
:
: -----Original Message-----
: From: Ben Doom [mailto:bdoom@;moonbow.com]
: Sent: Thursday, October 31, 2002 8:15 PM
: To: CF-Talk
: Subject: client vs. session
:
:
: I read up a bit on client and session scopes, and am a bit confused.
:
: Can someone explain to me the difference between them? All I can really
: find is that I have a bit more control over where, for example, session
: variables are stored.
:
: Feeling unscoped....
:
:
: --Ben Doom
: Programmer & General Lackey
: Moonbow Software
:
:
:
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