Adobe Coldfusion Anthology by Michael Dinowitz, Judith Dinowitz

By Michael Dinowitz, Judith Dinowitz

Something has beleaguered the ColdFusion surroundings: a scarcity of deep wisdom. This e-book is a welcome palliative to that. if you are a major ColdFusion programmer, paying for this ebook could be a no brainer.

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Com"> The method we added, onApplicationStart, will be called by ColdFusion automatically the first time a user hits the application. Notice there is no isDefined or wasted application variable to check. We just set the application variables for our site, and we’re finished with it. Also notice that the method returned true. If you return false, the application won’t start. Why would you ever return false? Well, you might write some code that checks to make sure the data source is working.

The only required attribute is name, which is used when executing the function. Listing 3-2 creates a basic UDF. Listing 3-2. Basic UDF creation Function code Other than the name attribute, the only other attributes of importance are hint, returntype, and output. The hint attribute is used to document the UDF. It should be used in all UDFs as a best practice. While there is also a description attribute, most people ignore it in favor of hint. returntype is an optional attribute that validates the data being returned from the UDF and throws an error if the validation fails.

Cfc file. Listing 1-5. cfm If you run the index file, you should see a dump of the Application scope. Since we didn’t actually put anything in it, you should see just the application name. Adding Application Variables Next let’s look at how to add application variables. This section describes eight methods for doing so. The onApplicationStart Method The “old-style” code would do something like the code shown in Listing 1-6. CFC Listing 1-6.

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