I have faced this issue with a Web Service I have developed for an external
supplier.
What was done here was to create a structure that was ALWAYS returned -
with an appropriate ErrorCode and ErrorString always embedded into the
Struct.
If the Struct contains a non-zero ErrorCode, then the ErrorString will
contain a meaningful message that can be displayed to the user (or the
application can process the error code and make up its own appealing
message) and the embedded data (i.e. a QUERY or an ARRAY) just WONT exist
in the Struct.
That way you ALWAYS get something back that you can work with and the
caller is responsible for error checking.
Now..... not that I have used CFTRY/CFCATCH in that particular web-service
- but it is the same concept.
So - in short - I dont return the actual data type for the call - I return
a wrapper struct.
Gary Menzel
IT Operations Brisbane -+- ABN AMRO Morgans Limited
Level 29, 123 Eagle Street BRISBANE QLD 4000
PH: 07 333 44 828 �FX: �07 3834 0828
[EMAIL PROTECTED] wrote on 01/23/2003 09:50:45 AM:
> Heres the latest and greatest issue that leaves me biting my nails into
the
> wee hours of slumber..
>
> Like most here I utilise the power of CFC's more so for everything that I
> have ever done before, and I would like to setup a cftry / error catching
> system on sensitive method calls cf (i.e. Query Calls, File Manipulation
> etc). I also like most of you wish to keep all Presentation Layer Logic
out
> of the cfcs, thus allowing for both browser and flash to not suffer (or
even
> pda's but that's another email altogether).
>
> Usually in the past prior to CFMX I used to do a try/catch on all
queries,
> in the event the datasource is down etc so that the end-user visiting the
> site see's a warm fuzzy feeling "oops" page, while alerting me as to
what's
> happening so I can fix it.
>
> Heres the scenario, I need to come up with a solution to allow the same
> concept to be applied to the cfmx, I have separated my database
interaction
> from the "parent" component.. eg:
>
> products = createObject("component","comp.products");
>
> products.sql = createObject("component","comp.productsSQL");
>
> Inside the SQL component I have cftry/catch between the cfcomponent tags,
> and inside the cfcatch I do my usual logging/email outs etc, but I also
then
> define a new structure called "compERROR" and inside that I add my own
> custom messages as well as appending the actual error message to this.
>
> One theory we have is that when you make "sensitive" calls from the
caller
> page, you do an if/else statement directly after it to make sure that
you're
> expected returned results are safe i.e.:
>
> <cfscript>
>
> qProductRegions = products.sql.productRegionsSELECT();
>
> </cfscript>
>
> <cfif isDefined('compERROR')>cflocation to pretty page </cfif>
>
> This basically works, but with as you can imagine some to if not allot of
> limitations, especially when one assumes that its a direct call from the
> actual caller page to the query component.. but in many cases the
> presentation layer may not be making the direct call, it may be via a
public
> method which makes calls to private methods?
>
> How would one then trap that error, and halt the overall process then and
> there, while returning an error safely back to the presentation layer
> without causing errors within errors... i.e. if you have a method
expecting
> a "query" result, and you return nothing, then that cfcomponent will
> generate an error? so it never freakin stops.
>
>
>
> I guess, what's peoples input on error catching and control with
Coldfusion
> Components.
>
>
>
> --
> Freelance Application Developer / Designer
> --
> ph: 07 3288 6702
> mob: 04040 32812
> --
> url: http://www.spidaweb.com
>
>
>
>
> ---
> You are currently subscribed to cfaussie as:
[EMAIL PROTECTED]
> To unsubscribe send a blank email to
[EMAIL PROTECTED]
>
> MX Downunder AsiaPac DevCon - http://mxdu.com/
---
You are currently subscribed to cfaussie as: [email protected]
To unsubscribe send a blank email to [EMAIL PROTECTED]
MX Downunder AsiaPac DevCon - http://mxdu.com/
