On 11/7/05, Ung, Seng <[EMAIL PROTECTED]> wrote:
> I am having a very tough time to understand what cfproperty does.
<cfproperty> does two things:
1. It describes public instance data in a CFC that is intended to be
the return type of a web service (or, in some cases, passed into a web
service).
Since CFML is essentially a typeless language, the <cfproperty> tag
provides information needed by the web service libraries to map
between a CFC and a strongly typed structure. Really this is just a
way to provide structs in CFML that have enough information associated
with them (metadata) to allow interaction with strongly typed web
services.
2. It adds to the metadata for a CFC
This can be useful for documentation purposes or tools that depend
on introspection however I don't advise building systems that perform
dynamic introspection (at runtime) since they often don't scale very
well.
In other words, most people actually won't need to use <cfproperty>.
If you're calling a web service that returns a strongly typed
structure containing two elements (C++ syntax):
struct Result {
double amount;
String currency;
}
The equivalent CFML code would be:
Result.cfc:
<cfcomponent>
<cfproperty name="amount" type="numeric"/>
<cfproperty name="currency" type="string"/>
</cfcomponent>
The returned object would be used like this:
<cfset result = ws.callMethod() />
<cfset amount = result.amount />
<cfset currency = result.currency />
(Caveat: all untested code off the top of my head - errors & omissions
excepted :)
--
Sean A Corfield -- http://corfield.org/
Got frameworks?
"If you're not annoying somebody, you're not really alive."
-- Margaret Atwood
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