what Dominic meant is that value="#somevalue#" in cfqueryparam tag
cause the problem when somevalue var does not exist, not the
isDefined("somevalue") part.
Azadi
On 02/05/2010 06:12, Dave Watts wrote:
>> I believe the trouble to be this:
>>
>> <cfqueryparam value="#someValue#" null="#not IsDefined('someValue')#" />
>>
>> Works fine when the value is defined. However, if the value is not defined,
>> value="#someValue#" will throw an error - ColdFusion evaluating it
>> before/regardless of the value of the null attribute.
> But that's not how isDefined works. If you pass isDefined a string
> literal, it tests to see if there is a variable whose name matches the
> string literal. So, this will work:
>
> isDefined("thisVariableDoesNotExist")
>
> and (assuming the variable doesn't exist) it will return false. But,
> if you did this:
>
> isDefined(thisVariableDoesNotExist)
>
> it would first evaluate the expression thisVariableDoesNotExist, and
> that would cause an error (again, assuming the variable doesn't
> exist).
>
> In the posted code sample, there are single quotes around someValue,
> making it a string literal.
>
> Dave Watts, CTO, Fig Leaf Software
> http://www.figleaf.com/
> http://training.figleaf.com/
>
> Fig Leaf Software is a Veteran-Owned Small Business (VOSB) on
> GSA Schedule, and provides the highest caliber vendor-authorized
> instruction at our training centers, online, or onsite.
>
>
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