Part IV ColdFusion MX Components, Web Services, and Flash Integration in Java

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Part IV ColdFusion MX Components, Web Services, and Flash Integration
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If you design it by using a few advanced principles, a component can represent a unique instance of an entity for example, a specific company that persists in your application and has both properties (data pertaining to that specific company) and methods (functions that the company may perform, such as updating itself in the database). More on persistent components in the section Persistent components, later in this chapter.
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Note When referring to both components and objects, the terms function and method are interchangeable. We use each term where it seems to make the most sense or fit best with the surrounding discussion.
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23 takes you step by step through the process of creating two real-world components, but you need a simple example in the meantime to help explain things, so we start you out in the following sections with a basic component that simply groups together the functions related to working with a company.
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You know from experience that just about every entity in our database requires basic CRUD (Create, Read, Update, and Delete) functionality and also probably requires some kind of listing capability, so you start out by creating the shell of the component that contains these functions. The name of the component is Company, so you create a file named Company.cfc that contains the first layer of the shell, as follows:
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<cfcomponent> <cffunction <cffunction <cffunction <cffunction <cffunction </cfcomponent> name= GetCompany ></cffunction> name= ListCompanies ></cffunction> name= CreateCompany ></cffunction> name= UpdateCompany ></cffunction> name= DeleteCompany ></cffunction>
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Without any explanation at all, you can already tell that the preceding is a component containing five functions named GetCompany, ListCompanies, CreateCompany, UpdateCompany, and DeleteCompany and we bet that you can guess what each of these functions is going to do! The only thing that requires any explanation is the new extension, .cfc, which specifies the file as a ColdFusion component. So far, so good. Now to give the first function, GetCompany(), an interface so it can be invoked. The next layer of the shell specifies what is returned from the GetCompany() function a query contained in a variable named companyRec, as follows:
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<cfcomponent> <cffunction name= GetCompany returntype= query > <cfreturn companyRec> </cffunction> <cffunction <cffunction <cffunction <cffunction </cfcomponent> name= ListCompanies ></cffunction> name= CreateCompany ></cffunction> name= UpdateCompany ></cffunction> name= DeleteCompany ></cffunction>
22 Understanding ColdFusion MX Components
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But you need to know which company record to retrieve, so you must supply an argument containing the CompanyID, as follows:
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<cfcomponent> <cffunction name= GetCompany returntype= query > <cfargument name= CompanyID type= numeric required= yes > <cfreturn companyRec> </cffunction> <cffunction <cffunction <cffunction <cffunction </cfcomponent> name= ListCompanies ></cffunction> name= CreateCompany ></cffunction> name= UpdateCompany ></cffunction> name= DeleteCompany ></cffunction>
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Now you have a complete input/output interface, so you can add the business logic that does the actual work, as follows:
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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 FROM Company WHERE CompanyID = #Arguments.CompanyID# </cfquery> <cfreturn companyRec> </cffunction> <cffunction <cffunction <cffunction <cffunction </cfcomponent> name= ListCompanies ></cffunction> name= CreateCompany ></cffunction> name= UpdateCompany ></cffunction> name= DeleteCompany ></cffunction>
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At this point, you have a ColdFusion component containing one working function and shells for four more functions that you complete a little later in this section. But how do you call the GetCompany() function inside this component You may remember from 17 that you can call a local function inside a ColdFusion template as follows:
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Part IV ColdFusion MX Components, Web Services, and Flash Integration
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<cfinvoke method= GetCompany returnvariable= returnVar > <cfinvokeargument name= CompanyID value= 10 > </cfinvoke>
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Calling a function in a component requires only one additional attribute, as follows:
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<cfinvoke component= Company method= GetCompany returnvariable= returnVar > <cfinvokeargument name= CompanyID value= 10 > </cfinvoke>
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If you specify component= Company in the CFINVOKE tag, ColdFusion does the following: 1. Finds the file Company.cfc. 2. Invokes the function named in the Method attribute. 3. Creates a local variable in the calling page with the name specified in the ReturnVariable attribute and the contents of what was returned by CFRETURN. Listing 22-1, for example, produces the result shown in Figure 22-1. (Notice how ReturnVariable makes the connection with Query between the CFINVOKE and CFOUTPUT tags.)
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