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Result attribute is valid only on cfmx 7
regards
salvatore
----- Original Message -----
Sent: Thursday, May 11, 2006 6:03
PM
Subject: Re: [CFCDev] MVC File
upload
Not to go too far off topic, but I'm not sure I follow this
logic. Say you have a stateless method in a service object
like:
<cffunction name="processUpload" access="" returntype="void"
output="false" roles="" hint="">
<cfargument
name="fieldName" type="string" required="true" hint=""
/>
<cfset var local = structNew()
/>
<cffile action = ""
fileField = "#arguments.fieldName#"
destination = "path and file name"
result = "local.cfFileResult"
/>
</cffunction>
What exactly about this is not thread
safe? The cffile itself runs only per method call and therefore per thread.
The result variable is kept in a method-local variable. I don't see how
another user request could have any affect on this.
On 5/11/06, Brian
Klaas <[EMAIL PROTECTED]>
wrote:
One thing to keep in mind as well is that the CFFILE
tag is not thread-safe. This means that data from one CFFILE operation (say,
the result data structure from a CFFILE operation) may inadvertently get
carried over to another CFFILE operation between user requests if the object
that contains the CFFILE code is cached at startup by your MG application.
As such, you don't want to instantiate your file upload code in an object
that is cached when your MG application starts up. You should instead
instantiate a separate object containing the actual CFFILE calls each and
every time you need to make a call to CFFILE.
(Another)
brian
No. I
understand how confusing some of these things can be, but in this case I
think some additional learning and research is in order. A Data Access
Object (DAO) is a very specific kind of object that is part of a design
pattern also called "Data Access Object". A DAO is specifically for
abstracting database interactions. Handling a file upload is not part of the
responsibility of a DAO. For more detail on the DAO pattern, you can Google
around, but here is a starting point: http://java.sun.com/blueprints/corej2eepatterns/Patterns/DataAccessObject.html
I would probably create a FileManager or even a
FileUploadManager if the need is very specific, and have this object
encapsulate all behavior related to handling a file upload.
Hope
that helps! This stuff takes a good long time to wrap your head around (at
least it took/is still taking me a long time).
Brian
On
5/11/06, David Henry <[EMAIL PROTECTED]>
wrote:
I am very new to the MVC process for
web development. How would I set up a file upload that follows the MVC
model? Should I create a Data Access Object that does cffile
operations? Thanks for your help!
~David
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