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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Building a Flash Remoting Application
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So that you can get an idea of where you re going, Figure 26-2 shows what the finished Flash Remoting application that you re about to build looks like.
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Figure 26-2: The finished application. After you launch the application, the Choose Company combo box fills with an alphabetical list of all companies in the database. After you choose a company, its data is retrieved from the database and displayed in the Flash movie s input fields. If you edit a value and click the Update Company button, that company s data is updated in the database, and the Choose Company combo box repopulates. If an error occurs while retrieving or manipulating data, an error message appears in red just above the Update Company button. Not too complicated. In fact, we ve kept everything very simple so that you can concentrate on the overall process rather than individual pieces of complicated code. If you re new to Flash, keeping a new authoring tool, a new language, and a new technology straight in your head is hard enough. We only have a limited space in which to discuss Flash Remoting in this book, so we concentrate on getting the basics down and leave more elaborate instructions to books dedicated to Flash Remoting, such as Complete Flash Remoting by the very talented and wise Joey Lott (Wiley).
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Building the ColdFusion component
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You start your work with Flash Remoting by building what you re most familiar with at this point: ColdFusion components. Listing 26-1 shows the complete ColdFusion component for this application. Create a file named Company.cfc in your webroot/com/flashremoting directory, and enter into it the code shown in Listing 26-1.
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Listing 26-1: The ColdFusion component used by the application
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<cfcomponent> <cffunction name= GetCompany returntype= query access= remote > <cfargument name= CompanyID type= numeric required= yes > <cfset Var compRec = > <cfquery name= compRec datasource= #Request.MainDSN# > SELECT CompanyID,
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26 Flash Remoting Services
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CompanyName, Address, City, State, ZipCode, Comments FROM Company WHERE CompanyID = #Arguments.CompanyID# </cfquery> <cfreturn compRec> </cffunction> <cffunction name= ListCompanies returntype= query access= remote > <cfargument name= CompanyFilter type= string required= No default= > <cfset Var companyRecs = > <cfquery name= companyRecs datasource= #Request.MainDSN# > SELECT CompanyID, CompanyName, Address, City, State, ZipCode, Comments FROM Company <cfif Len(Trim(Arguments.CompanyFilter)) GT 0> WHERE CompanyName LIKE #Trim(Arguments.CompanyFilter)#% </cfif> ORDER BY CompanyName </cfquery> <cfreturn companyRecs> </cffunction> <cffunction name= UpdateCompany returntype= void access= remote > <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= No >
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Continued
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Part IV ColdFusion MX Components, Web Services, and Flash Integration
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Listing 26-1 (continued)
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<cfset Var updCompany = > <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)# <cfif IsDefined( Arguments.Comments )> , Comments = #Trim(Arguments.Comments)# </cfif> WHERE CompanyID = #Arguments.CompanyID# </cfquery> <cfreturn> </cffunction> </cfcomponent>
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Pretty straightforward stuff, but we should mention a few important points, as follows: The first thing that you should notice is that all functions access attributes are set to remote, just as you do in 25 with Web services. Basically, if it s accessed outside ColdFusion MX, the access level must be set to remote. In the ListCompanies() function, the CompanyFilter argument is optional, but it defaults to an empty string if the argument is not provided, so as the function executes, the CompanyFilter argument is always defined. Because your Flash application does not send the CompanyFilter argument, your code must test for its trimmed length rather than its declaration and then use it only if an actual value is passed. Similarly, your Flash application doesn t enable you to edit the Company.Comments column so Comments is an optional argument. You don t declare a default value for this argument because doing so overwrites the current contents of that column in updating the Company record, so here you test only whether it was passed.
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