I need help making use of the Spry filter example found at
http://labs.adobe.com/technologies/spry/samples/data_region/NonDestructi
veFilterSample.html
But with a couple of improvements.
1. I'd like to use the cfsprydataset command.
2. I'd like to use a cfc to return data.
3. I'd like to use JSON instead of XML because Ray has blogged that JSON
is much smaller.
4. I'm concerned that I shouldn't be returning queries at all from
components. In Forta's Flex presentation, he said that his component
was returning an array.
Here's a (simplified) example of the type of components that I use:
<cfcomponent>
<cffunction name="Init" output="false">
<cfargument name="DS">
<!--- DS is a structure DS.Datasource, DS.Username, DS.Password,
DS.ErrorTrapping, DS.Logging --->
<cfset Variables.DS = Duplicate(arguments.DS) /> <!--- Keep the
DS argument in the Variables scope --->
<cfreturn this>
</cffunction>
<cffunction name="View0">
<cfset var Qry="" />
<cftry>
<cfquery name="Qry" datasource="#Variables.DS.Datasource#"
username="#Variables.DS.Username#" password="#Variables.DS.Password#">
SELECT * FROM Tbl
</cfquery>
<cfcatch>
<cfif Variables.DS.ErrorTrapping>
<cfset Qry =
DatabaseObj.TrimErrorMessage(cfcatch.detail)>
<cfelse>
<cfrethrow>
</cfif>
</cfcatch>
</cftry>
<cfreturn Qry>
</cffunction>
<cffunction name="TrimErrorMessage" output="false">
<cfargument name="errorMessage">
<cfset var result = arguments.errorMessage>
<cfset result=REPLACE(result,'[Macromedia]','','ALL')>
<cfset result=REPLACE(result,'[SQLServer JDBC Driver]','','ALL')>
<cfset result=REPLACE(result,'[SQLServer]','','ALL')>
<cfreturn result>
</cffunction>
</cfcomponent>
Todd at
http://cfsilence.com/blog/client/index.cfm/2007/5/30/ColdFusion-8--Spry-
Integration
mentions the cfsprydataset command.
________________________________
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Peter
Bell
Sent: Thursday, August 30, 2007 10:24 AM
To: cfcdev@cfczone.org
Subject: Re: [CFCDEV] Ok, now I have a question re: composition
Just let me know if any outstanding questions!
Best Wishes,
Peter
On 8/29/07 11:00 PM, "Justin Treher" <[EMAIL PROTECTED]>
wrote:
Peter -
I see you have a blog entry about it from March. I'll check that out.
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]> On Behalf Of Peter Bell
Sent: Wednesday, August 29, 2007 6:30 PM
To: cfcdev@cfczone.org
Subject: Re: [CFCDEV] Ok, now I have a question re: composition
I cheat. I have a business object called "value list" which allows the
users to manage all of their simple value lists and I gen the CRUD for
the value lists, so users can manage their state list, order status
list, employee type list, etc without us having to generate a bunch of
code for each by treating them all as separate business objects.
Best Wishes,
Peter
On 8/29/07 6:12 PM, "Justin Treher" <[EMAIL PROTECTED]> wrote:
Gotcha Peter. I was looking at enumerated values in Java and that that
might be the way to go. However, what about giving users an interface to
edit those values? Should they, at that point, become an object with a
GW and DAO? Or is there a simpler way to provide an interface to edit
those list values?
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]> On Behalf Of Peter Bell
Sent: Wednesday, August 29, 2007 5:57 PM
To: cfcdev@cfczone.org
Subject: Re: [CFCDEV] Ok, now I have a question re: composition
Its a choice, but personally I have the concept of a "Value List".
Whenever I have a list of values that have a title and possibly a name,
but no other properties, I treat them as a value list. It is similar to
an enum, but allows the title and name to be different (e.g. "New York"
vs. "NY"). While it isn't wrong per se to turn every list of values
into a collection of objects, if you just want a drop down list of US
states, I'm not convinced that needs to be a collection of objects. Same
with book types and wand materials. If on the other hand different book
types have a collection of properties and/or custom behaviors,
implementing them as objects might make perfect sense.
Best Wishes,
Peter
On 8/29/07 5:34 PM, "Justin Treher" <[EMAIL PROTECTED]> wrote:
I guess I need to dive into an ORM now that I'm experiencing the problem
it solves.
Composition, delegation, and aggregation seem to be tough concepts for
me to understand with respect to when I should be using them vs. a
structure that is filled from the database.
Example:
Blog has a property categories
We need a select list filled with possible categories for our new blog
entry. Is that select getting category information from a category
object or is this a struct filled from somewhere?
I've been handling this situation like this:
Blog's categories property is an array of category objects. Category has
its own bean, GW, and DAO. While this seems ok because I need to edit
categories independently, category really doesn't have any behaviors.
So do I pretty much handle all properties of this type like that?
Address -> State is an object of State
Members ->MembershipTypes is an object of membershipType
Books -> BookType is an object of BookType
Wand -> Materials is an array of objects WandMaterial
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]> On Behalf Of Brian Kotek
Sent: Wednesday, August 29, 2007 4:50 PM
To: cfcdev@cfczone.org
Subject: Re: [CFCDEV] Tom Minderson and anti-OO
Sounds like someone who doesn't get OO and has decided that he must be
right and the rest of the programming world is wrong.
On 8/29/07, Justin Treher <[EMAIL PROTECTED]> wrote:
I do see his point that trying to map objects to a relational database
is where OOP starts to feel really unnatural. In addition, with the
business objects we deal with, it seems unnatural for them to have
behaviors, unlike a car being able to "start()".
Dealing with relational databases is what ORM was created for.
Regarding business objects, if you have objects with no behavior you
basically might as well just be using a structure. I would disagree that
it is unnatural for the business objects we deal with to have behavior.
If objects shouldn't have behavior, where does the actual application
logic go? If you don't encapsulate the behavior with the data (in an
object) then it just results is spaghetti code all over the place.
shipment.determineShippingTime()
inventory.adjustInventory(order)
contentCache.clear()
These seem perfectly natural to me. Basically, even if you don't
completely understand or even agree with the idea of OOP, the rest of
the world does. Failure to embrace, or at least understand, OOP in this
day and age is going to translate to a difficult programming career.
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We are cool code geeks looking for fun projects to rock!
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You are subscribed to cfcdev. To unsubscribe, please follow the
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We are cool code geeks looking for fun projects to rock!
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You are subscribed to cfcdev. To unsubscribe, please follow the
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We are cool code geeks looking for fun projects to rock!
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