ColdFusion Components - An Introduction

[ArticleBot]

This is an article discussion thread for discussing the SitePoint article, "ColdFusion Components - An Introduction"

[Nate]

Just letting you know you have a syntax error in the example. [component="compontents.users.general.users"] Should obviously read [component="components.users.general.users"]
(spelled components as compontents)

take care.

[Lazz]

I am wondering how to return an error message from a CFC function which has a return type of QUERY. If I want to return a database error how do I do it? The function will want to return a query not a message string.

I have tried to write a generic return routine that handles messages as well as data. I have put that routine in a base component and all other components extend that base component. Unfortunately I can't get it to work. It keeps telling me the object I have assigned the CFC to is undefined.

I'd love to know how you have written this into your CFCs.

Many thanks,

Lazz.

[josejp]

lots of thanx 2 ERIC
It was relly helpful for me.thanx for the cute tutorial

[creole]

Lazz...

You could change the return type of your CFC from query, to structure, then add in any error messages too, maybe like this:

<cfset returnStruct = StructNew()>
<cfset returntype.query = myQueryName>
<cfset returntype.error = myErrorMessage>

<cfreturn returnStruct>

[Rynoguill]

I am wondering how to return an error message from a CFC function which has a return type of QUERY. If I want to return a database error how do I do it? The function will want to return a query not a message string.

I have tried to write a generic return routine that handles messages as well as data. I have put that routine in a base component and all other components extend that base component. Unfortunately I can't get it to work. It keeps telling me the object I have assigned the CFC to is undefined.

I'd love to know how you have written this into your CFCs.

Many thanks,

Lazz.

Check out <cftry> and <cfcatch> and <cfthrow>. I can get you documentation pages if you need them. but just check out livedocs.macromedia.com.

[Rynoguill]

Lazz...

You could change the return type of your CFC from query, to structure, then add in any error messages too, maybe like this:

<cfset returnStruct = StructNew()>
<cfset returntype.query = myQueryName>
<cfset returntype.error = myErrorMessage>

<cfreturn returnStruct>

Ive done this sort of thing before too, and it works well as long as you are ready to handle it on the receiving end. The cfthrow will just do a terminating error.

[sabiha chowdhury]

what is the advantage using CFC rather than normal coding in one cfm page

[dek]

what is the advantage using CFC rather than normal coding in one cfm page

I thought the reasons given in the article were pretty compelling myself...

[creole]

Ive done this sort of thing before too, and it works well as long as you are ready to handle it on the receiving end. The cfthrow will just do a terminating error.

But isn't that "outputting from a CFC?" GASP!!!

[shariff]

thanks a very good tutorial about components in coldfusion