Adobe ColdFusion 9 Web Application Construction Kit, Volume by Ben Forta

By Ben Forta

Written by way of the simplest identified and such a lot depended on identify within the ColdFusion group, Ben Forta, The ColdFusion internet program building equipment is the best-selling ColdFusion sequence of all time - the books that the majority ColdFusion builders used to benefit the product. This moment quantity of the sequence starts by means of introducing very important code association and administration concepts, after which progresses to issues that come with integrating with every kind of different applied sciences (including PDF, Adobe Flex and information companies, Ajax, complex SQL and databases, ORM), debugging, and optimizing functionality. From layout and making plans, to program deployment and troubleshooting, this educational reference is all you want to effectively paintings, create, and development with ColdFusion nine. whole assurance of ColdFusion nine is integrated in "Volume 1, Getting began" (0-321-66034-X) and "Volume three, complicated software improvement" (0-321-67920-2).

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Additional resources for Adobe ColdFusion 9 Web Application Construction Kit, Volume 2: Application Development

Example text

Com 12 chapter 22 Building User-Defined Functions Most of the time, you’ll want to keep your UDFs in separate files to make them easy to reuse in your various ColdFusion pages. cfm that contains the getFilmTitle() function. Later, as you create other film-related functions, you could put them in the same file. Once you have this file in place, you can simply include the file with a tag to use the function it contains. 2 shows how to create such a file. 1; here it’s simply dropped into its own template.

The difference is the fact that this tag accepts an attribute called message, which gets displayed as part of the “Hello, World” message. message” type=”string”>

Hello, World, from Orange Whip Studios. 4 makes it clear that a message parameter is expected to be provided to the tag and that it is expected to be a string value. The block near the end outputs the value of the message parameter provided to the tag. 5 shows how to supply the message parameter that the tag now expects.

Next, a tag at the top of the function defines what its input should be. Finally, a tag at the end returns the function’s output. Nearly all UDFs are constructed using this basic pattern. Everything else between the tags is the actual CFML code that will be executed each time the function is invoked. In this simple example, the only processing that needs to occur to generate the function’s output is a simple database query. As you can see, a special ARGUMENTS scope will contain the value of each argument when the function is actually used.

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