22-1: Invoking a component function and displaying the result in Java

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Listing 22-1: Invoking a component function and displaying the result
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<cfinvoke component= Company method= GetCompany returnvariable= returnVar > <cfinvokeargument name= CompanyID value= 10 > </cfinvoke> <table cellspacing= 2 cellpadding= 2 border= 1 > <cfoutput query= returnVar > <tr> <td><b>CompanyID</b></td> <td>#CompanyID#</td> </tr> <tr> <td><b>CompanyName</b></td> <td>#CompanyName#</td> </tr> <tr> <td><b>Address</b></td> <td>#Address#</td> </tr> <tr>
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<td><b>City</b></td> <td>#City#</td> </tr> <tr> <td><b>State</b></td> <td>#State#</td> </tr> <tr> <td><b>ZipCode</b></td> <td>#ZipCode#</td> </tr> <tr> <td><b>Comments</b></td> <td>#Comments#</td> </tr> </cfoutput> </table>
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Figure 22-1: The resulting output from Listing 22-1. After you flesh out the rest of the Company component s functions, you end up with Listing 22-2.
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Listing 22-2: The completed Company component
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<cfcomponent> <cffunction name= GetCompany returntype= query > <cfargument name= CompanyID type= numeric required= yes > <cfquery name= companyRec datasource= #Request.MainDSN# > SELECT CompanyID, CompanyName, Address, City, State, ZipCode, Comments
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Listing 22-2 (continued)
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FROM Company WHERE CompanyID = #Arguments.CompanyID# </cfquery> <cfreturn companyRec> </cffunction> <cffunction name= ListCompanies returntype= query > <cfargument name= CompanyFilter type= string required= no > <cfquery name= companyRecs datasource= #Request.MainDSN# > SELECT CompanyID, CompanyName, Address, City, State, ZipCode, Comments FROM Company <cfif IsDefined( Arguments.CompanyFilter )> WHERE CompanyName LIKE #Trim(Arguments.CompanyFilter)#% </cfif> ORDER BY CompanyName </cfquery> <cfreturn companyRecs> </cffunction> <!--- Void functions are explained later in this chapter in the section Void functions ---> <cffunction name= CreateCompany returntype= void > <cfargument name= CompanyName type= string required= Yes > <cfargument name= Address type= string required= Yes > <cfargument name= City type= string required= Yes > <cfargument name= State type= string required= Yes > <cfargument name= ZipCode type= string required= Yes > <cfargument name= Comments type= string required= Yes > <cfquery name= insCompany datasource= #Request.MainDSN# > INSERT INTO Company( CompanyName, Address, City, State, ZipCode,
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Comments ) VALUES ( #Trim(Arguments.CompanyName)# , #Trim(Arguments.Address)# , #Trim(Arguments.City)# , #Trim(Arguments.State)# , #Trim(Arguments.ZipCode)# , #Trim(Arguments.Comments)# ) </cfquery> <cfreturn> </cffunction> <cffunction name= UpdateCompany returntype= void > <cfargument name= CompanyID type= numeric required= Yes > <cfargument name= CompanyName type= string required= Yes > <cfargument name= Address type= string required= Yes > <cfargument name= City type= string required= Yes > <cfargument name= State type= string required= Yes > <cfargument name= ZipCode type= string required= Yes > <cfargument name= Comments type= string required= Yes > <cfquery name= updCompany datasource= #Request.MainDSN# > UPDATE Company SET CompanyName = #Trim(Arguments.CompanyName)# , Address = #Trim(Arguments.Address)# , City = #Trim(Arguments.City)# , State = #Trim(Arguments.State)# , ZipCode = #Trim(Arguments.ZipCode)# , Comments = #Trim(Arguments.Comments)# WHERE CompanyID = #Arguments.CompanyID# </cfquery> <cfreturn> </cffunction> <cffunction name= DeleteCompany returntype= void > <cfargument name= CompanyID type= numeric required= Yes > <cfquery name= delCompany datasource= #Request.MainDSN# > DELETE Company WHERE CompanyID = #Arguments.CompanyID# </cfquery> <cfreturn> </cffunction> </cfcomponent>
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By now, you probably get the basic idea that, at its most basic level, a component is like a container for related functions, and invoking component functions is much like invoking local functions except that you must also specify the name of the component that contains the function. So . . . big deal You bet! Even the most basic use of the simplest components changes your approach to ColdFusion development, because you re now completely separating logic from presentation; you re exposing logic as a set of simple, yet formal function calls available to any part of your application (even remote applications, as you see in s 25 and 26); and you re encapsulating the functions related to a single entity into a single component. And if you think components are just a substitute for a bunch of CFINCLUDEs, keep reading. .
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The need to separate logic from presentation is more important now than it has ever been for a number of reasons, as outlined in the following list: The ever-increasing array of handheld devices and their widely varying display formats. The renewed interest in syndicated content that must form-fit various Web layouts. The trend away from delivering plain-text streams and HTML and toward delivering generalized XML, XHTML, WML, and other pivot formats (i.e, formats that acts as intermediate steps in a data conversion process) that are further processed into finished content on target devices. The desire to easily expand very large corporate applications while minimizing new errors or anomalies into the software. The headlong rush into delivering better, faster Web applications through Flash MX Remoting technology. By encapsulating into a single component all the functionality related to an entity and then simply calling on that component whenever data is needed to be retrieved, updated, deleted, and so on, you build applications that help achieve the goals of targeting common functionality to multiple display formats and building Enterprise-scale applications that are straightforward to develop and easy to maintain. Another benefit of such encapsulation is the focus that it naturally places on good design. If you ve developed in earlier versions of ColdFusion, think for a moment how you approached pre-MX ColdFusion application design. Data was the stuff that you shoved into and pulled out of databases for the sole purpose of accomplishing some task spread out across a number of individual browser pages. Sure, you had CFINCLUDE and custom tags, and you could create snippets of reusable code if you were keen enough to spot duplicated code, but all your logic was still thinly spread out across multiple templates located who-knows-where. If you take the opposite approach and gather together all the functionality related to an entity into a single component, you begin to think like the entity and ask yourself, What does a company need to do After the obvious partial answer of Create, read, update, delete, and list, you begin to uncover a few specialized needs such as calculate the annual sales of the company and tell me how many people are employed by this company all of which can be incorporated into that one Company component. Before you even know what you ve done, you ve built a centralized source from which to request all operations and data related to companies, regardless of how the data is supplied to or requested from that source. Now, all you need to do is call this functionality and display the results.
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