Yessir. You can supply any arguments you need within those parenthesis. :)
-----Original Message----- From: Rick Faircloth [mailto:[EMAIL PROTECTED] Sent: Tuesday, June 17, 2008 1:39 PM To: CF-Talk Subject: RE: cfc question... Thanks, Jason! I'll work on this approach. Seems much simpler to work with once the function is instantiated in memory. Here's a question: Would I include argument variables in a call like this? <cfset qAgents = agentLibrary.getAgents() /> I assume the parenthesis are empty because no arguments are involved? However, if I wanted to get a particular agent's info: <cfset qAgent = agentLibrary.get_agent_info( url.agentid ) /> if using a url, or <cfset qAgent = agentLibrary.get_agent_info( form.agentid ) /> if using a form variable to id the agent. Correct? Rick > -----Original Message----- > From: Jason Durham [mailto:[EMAIL PROTECTED] > Sent: Tuesday, June 17, 2008 11:09 AM > To: CF-Talk > Subject: RE: cfc question... > > You don't *have* to use cfinvoke. I prefer not to. > > Once you have instantiated (created an instance of it in memory) the > object like you wrote below... you can 'invoke' any of the methods by > calling them via the object instance name. > > <!--- Instantiate agentLibrary component ---> > <cfset agentLibrary = > createObject("component","components.agents.agent").init(application.dsn > ) /> > > <!--- Get a list of agents, hold in query object called 'qAgents' ---> > <cfset qAgents = agentLibrary.getAgents() /> > > <!--- Loop through agents and output their names ---> > <cfoutput query="qAgents"> > Agent Name = DB_FIELD_AGENT_NAME <br /> > </cfoutput> > > Soon you will find the answer to all of your questions regarding OOP or > CFCs will be "it depends". What does your agentLibrary CFC do? If your > agentLibrary CFC interacts with a database (as you have indicated), then > what you're doing is correct. Set a variable to hold your DSN/DB > credentials, and reference that variable when instantiating any > components that have to access the DB. > > > > -----Original Message----- > From: Rick Faircloth [mailto:[EMAIL PROTECTED] > Sent: Monday, June 16, 2008 3:57 PM > To: CF-Talk > Subject: RE: cfc question... > > Ok, let me see if I'm understanding this... > > <cfset agentLibrary = > createObject("component","components.agents.agent").init( > datasourcename ) /> > > The part above goes in the calling page before the cfinvoke > statement, right? If so, how does this work with the cfinvoke > statement? > Is "agentLibrary" above becoming the variable that will hold > all the data returned by the cfc function, "agent"? > > And I've always defined my db's using > <cfset dsn='datasource'> > in my application.cfm file, so if I continue doing that, then > I guess the creation of the agentLibrary variable above would be: > > <cfset agentLibrary = createObject('component', > 'components.agents.agent').init(#dsn#) /> > or something? > > Or would defining the variable 'dsn' in my application.cfm become > an obsolete practice in the 'cfc era'??? > > Also, in your code below, I don't see the variable 'agentLibrary' being > used > after creation (instantiation?)...so how does it fit into the cfc > functionality? > > Rick > > > > -----Original Message----- > > From: Mike Kear [mailto:[EMAIL PROTECTED] > > Sent: Monday, June 16, 2008 1:29 AM > > To: CF-Talk > > Subject: Re: cfc question... > > > > Ok syntax error forgot the closing quotes. Make that: > > > > > > <cfset agentLibrary = > createObject("component","components.agents.agent") /> > > > > > > And usually at the top of an object like that (if it's for the kinds > > of things i think it is) you would have an init() function that you > > tell the component the datasource name. That looks something like: > > > > <!--- Constructor / initialisation ---> > > <cffunction name="init" access="Public" returntype="agent" > > output="false" hint="Initialises the component"> > > <cfargument name="datasourcename" required="true" type="string" /> > > <cfset variables.dsn = arguments.datasourcename /> > > <cfreturn this /> > > </cffunction> > > > > > > It seems a bit of extra typing to have that at the top of your cfc, > > but for reasons of encapsulation (sorry for using the jargon!) its > > best to have the cfc so that if it needs to know something you'll tell > > it, rather than have it rely on finding what it needs in application > > or session scope or something. So if you have that init() function > > in your component, you'd instantiate it by chaining the .init() method > > when you invoke it. ( You can chain methods one behind the other ) > > > > <cfset agentLibrary = > > createObject("component","components.agents.agent").init( > > datasourcename ) /> > > > > Throughout your cfc, wherever any function needs to run a query on the > > datasource, it will do it like so: > > > > <cfquery name="qThisQuery" datasource="#variables.dsn#"> > > SELECT AgentID from Agents > > WHERE GRPOffCE = <cfqueryparam value="#officeid#" > > cfsqltype="cf_sql_varchar"/> > > </cfquery> > > > > > > That way you can easily reuse the component without having to need the > > datasource to exist in application scope or anywhere else for that > > matter. The cfc needs to know the datasourcename so you tell it that > > when you instantiate the cfc. > > > > > > Cheers > > Mike Kear > > Windsor, NSW, Australia > > Adobe Certified Advanced ColdFusion Developer > > AFP Webworks > > http://afpwebworks.com > > ColdFusion, PHP, ASP, ASP.NET hosting from AUD$15/month > > > > > > > > On Mon, Jun 16, 2008 at 3:15 PM, Mike Kear <[EMAIL PROTECTED]> > wrote: > > > I think you're nearly there, Rick. Just make sure you are > following > > > the rules about how to set out paths for components: > > > > > > if your component is in > > > e:\inetpub\webroot\c21ar\components\agents\agent.cfc and the web > > > root is at e:\inetpub\webroot\c21ar, then you would invoke the > > > component with the following: ("Instantiate" is another term that > > > confused me at first - how is 'instantiate' different from'invoke'? > > > answer: it's the same thing) > > > > > > <cfset agentLibrary = > createObject("component","components.agents.agent) /> > > > > > > > > > > > > > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| Adobe® ColdFusion® 8 software 8 is the most important and dramatic release to date Get the Free Trial http://ad.doubleclick.net/clk;203748912;27390454;j Archive: http://www.houseoffusion.com/groups/CF-Talk/message.cfm/messageid:307625 Subscription: http://www.houseoffusion.com/groups/CF-Talk/subscribe.cfm Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=11502.10531.4
