Yeah, you have to define everything first. And you have to set them all to
a value as well. You can reasign later, though, and the variable name is
still protected. This comes in very handy with queries:
<cffunction name="getlist">
<cfset var get = "" />
<cfquery name="get" datasource="#variables.my.dsn#">
SELECT *
FROM myTable
ORDER BY name
</cfquery>
<cfreturn get />
</cffunction>
You should do that for ALL queries, even if you don't need to use the name
afterwards (for insert, update and/or delete queries).
Cheers,
barneyb
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of Schreck, Thomas (PPC)
> Sent: Tuesday, February 10, 2004 10:57 AM
> To: [EMAIL PROTECTED]
> Subject: RE: [CFCDev] How should I define variable in a CFC?
>
> That makes sense, but it seems somewhat limiting. What happens as you
> process through the logic of your method and you need to set the value
> of a variable? By declaring the variable with var at the top, is it
> still protected further in your code? I assume so given your
> answer (I
> think I answered my own question). So, you must know all
> variables you
> want protected prior to getting into your method logic, correct?
>
> Tom
>
>
>
>
> -----Original Message-----
> From: Nathan Dintenfass [mailto:[EMAIL PROTECTED]
> Sent: Tuesday, February 10, 2004 12:45 PM
> To: [EMAIL PROTECTED]
> Subject: RE: [CFCDev] How should I define variable in a CFC?
>
> As the error says, you can only use var at the beginning of a
> method ;)
>
> In other words, you can only declare your local variables immediately
> after
> CFARGUMENT and before any other code. Though, in 6.1 you can declare
> them
> at the top of the first CFSCRIPT block inside the function
> body (a nice
> improvement, as you had to use CFSET for all var declarations in 6.0).
>
>
>
>
> > -----Original Message-----
> > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
> > Behalf Of Schreck, Thomas (PPC)
> > Sent: Tuesday, February 10, 2004 10:37 AM
> > To: [EMAIL PROTECTED]
> > Subject: RE: [CFCDev] How should I define variable in a CFC?
> >
> >
> > I've run into situations trying to use 'var' in front of a variable
> name
> > and it produces an error. Something to the affect "var can only be
> used
> > at the beginning of a method". What are the rules around using var?
> >
> > Thanks - Tom Schreck
> >
> >
> > -----Original Message-----
> > From: Barney Boisvert [mailto:[EMAIL PROTECTED]
> > Sent: Tuesday, February 10, 2004 12:02 PM
> > To: [EMAIL PROTECTED]
> > Subject: RE: [CFCDev] How should I define variable in a CFC?
> >
> > Using the 'var' keyword is only allowed inside
> functions/methods. It
> > creates a local variable that only exists for that specific
> invocation
> > of
> > the function. Such variables are immune to race conditions, because
> > they
> > are bound to a specific invocation. This is not specific
> to CFCs, you
> > can
> > use it in any function definition (including CFSCRIPT functions), in
> or
> > outside a CFC.
> >
> > Using the 'variables' scope creates a private variable
> accessible only
> > to
> > your CFC. It exists as long as the instance of the CFC is around.
> Such
> > variables are NOT immune to race conditions, because they are shared
> > across
> > the instance, and multiple clients may be calling methods
> on a single
> > instance at the same time.
> >
> > Using the 'this' scope is just like the 'variables' scope,
> except that
> > the
> > variables are public, so the can be read or written by
> client code, as
> > well
> > as methods of the CFC.
> >
> > Cheers,
> > barneyb
> >
> > > -----Original Message-----
> > > From: [EMAIL PROTECTED]
> > > [mailto:[EMAIL PROTECTED] On Behalf Of Troy Simpson
> > > Sent: Tuesday, February 10, 2004 9:38 AM
> > > To: [EMAIL PROTECTED]
> > > Subject: [CFCDev] How should I define variable in a CFC?
> > >
> > > All,
> > >
> > > I have been away from coldfusion for about a year or so and
> > > now need to
> > > get back into in. I am using ColdFusion MX for this project
> > > that I am
> > > working on. I need some clarification if possible.
> > >
> > > How should I define variables in a CFC and why?
> > > What is the difference between the three?
> > >
> > > <cfcomponent>
> > > <cfset var dsn = "DataSourceName">
> > > <cfset variables.dsn = "DataSourceName">
> > > <cfset this.dsn = "DataSourceName">
> > > </cfcomponent>
> > >
> > > Thanks,
> > > Troy
> > >
> > > --
> > > Troy Simpson
> > > Applications Analyst/Programmer, OCPDBA, MCSE, SCSA
> > > North Carolina State University Libraries
> > > Campus Box 7111 | Raleigh | North Carolina
> > > ph.919.515.3855 | fax.919.513.3330
> > > E-mail: [EMAIL PROTECTED]
> > >
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