Writing Your First ColdFusion MX Application in Java

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2 Writing Your First ColdFusion MX Application
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If you see the message datasource updated successfully, you are ready to build your example application. If you don t see this message, the datasource was set up incorrectly. Work through these steps again to resolve your problems before you go any further. Refer to chapters 43 and 44 for details on using and configuring ColdFusion Administrator.
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Planning Program Flow
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You can t just sit down and start writing code. All good projects start with a design process.
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Think in terms of processes
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An application is a collection of processes. The application that you re about to build, for example, among other things, adds new companies and employees to the database. Adding a company is one process in your application, and adding an employee is a second process. The user must also get a list of the companies and employees in the database, update information about a specific company or employee, and delete employees and companies from the database more processes to consider in designing your application. Figure 2-1 shows the processes that your application supports.
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Company List.cfm
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Figure 2-1: Process flowchart for your first ColdFusion MX application. Real-world process design is quite involved, often employing dedicated process-design tools, but at the very least, you should sketch a flowchart containing all processes that your application should support before you start creating directories, databases, and code.
Think in terms of data
Before you write an application, you should know the structure and nature of the data that your processes use. Will the application manage a store s inventory, blocks of content on a news site, or something completely different Your application in this chapter, for example, manages companies and employees. Each company has a name and address, comments about the company, and an identifier, or key, that
Part I Getting Started with ColdFusion MX
the database uses to keep track of which company is which. (For more information about database concepts, see Part II of this book.) Employees have a social security number (SSN), which identifies each employee (the employee s key), as well as a name, salary, date of birth, and the identifier, or key, of the company for which each employee works. Figure 2-2 shows the structure of the data that your application will manage. 8 explains the notations used in this diagram, but for now, just use it as a conceptual model of the Company and Employee tables and the relationship between them.
Figure 2-2: Model of employees and companies.
Setting Up the Framework For Your Application
Now that you ve decided what your application will do, you must create the basic framework within which your application is to run. To do so, follow these steps: 1. Launch HomeSite or a similar code editor of your choice. 2. Choose your C drive from the drop-down list at the top left of the HomeSite window. 3. Scroll down to the Inetpub directory in the tree below the drop-down list. 4. Expand Inetpub if using IIS (Internet Information Server), or CFusionMX if using the standalone web server. 5. Expand wwwroot. 6. Expand CFMXBible. 7. Select the Ch02 directory that you created in the section, Preparing your Web environment, earlier in this chapter. 8. Choose File New Document from the menu. 9. Select everything in the main editing window in HomeSite and press the Delete key to remove any default code. 10. Choose File Save from the menu and make sure that you are in the Ch02 directory (it should appear in the drop-down list above the list of files). 11. Name your new file Application.cfm and click Save.
Application.cfm is a special template that ColdFusion automatically executes before each template that you specifically request. It is the backbone of your framework, as you learn in 19. Make sure that the initial A is capitalized in the file name or it will not work on some platforms.
12. Type Listing 2-1 into the editing window and then save the file as Application.cfm.
2 Writing Your First ColdFusion MX Application
Listing 2-1: Application.cfm
<!--- Give your application a name ---> <cfapplication name= CH02 > <!--- This is the data source your application will use ---> <cfset Request.MainDSN = CFMXBibleAccess >
The CFAPPLICATION tag tells ColdFusion Server that all the templates and variables in your application are part of an application space named Ch02 within which all the application s variables and data will be contained, and Request.MainDSN contains the name of the datasource that you created earlier in this chapter in the section Setting up the database.