ColdFusion MX Language Reference in Java

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ColdFusion MX Language Reference
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In This Part
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Introduction to the Language Reference
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Designing Your Application Framework
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General Use Tags and Functions
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Working with Variables
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Flow Control
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Exception Handling
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Databases and Queries
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Custom Tags
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ColdFusion Scripting
Working with Systems Outside ColdFusion
Controlling Server Output and Whitespace
Charting, Reporting, and Logging
Files and Directories
The Registry
Functions, Components, & Web Services
Introduction to the Language Reference
e ve always found the language references in most computer books to be useless wastes of space. They are typically abbreviated to the point of being cryptic; they give no real examples of how the language is used; and they are organized alphabetically. Either that or they are nothing more than mirrors of the standard references that you receive with the software.
Until writing one ourselves we didn t understand why language guides turn out that way. If we wrote the kind of language reference for ColdFusion MX that we really want to, it would have a page count larger than the entire ColdFusion MX Bible that you are reading now. That approach doesn t work for the publisher, who has a realistic page count within which to work; nor does it work for the printer, who can physically bind only so many pages into a single book; nor does it work for you, the reader, who doesn t want to spend more than $100 for a book about ColdFusion MX. We were told to keep the language reference relatively brief because of these page limits. So we can t show example code for tags, as Macromedia s 738-page CFML Reference does. Our mandate is to impart as much practical knowledge as is possible in a very small space. Here goes. . . .
How This Language Reference is Organized
We decided to do things differently from all other ColdFusion references in organizing this language reference. We ve turned it into a solutions-oriented guide to the CF MX language, designed to work hand-in-hand with the language implementation techniques detailed in Part III, The ColdFusion MX Language. This language reference shows language syntax and important usage notes, and Part III describes how everything fits together in the real world. First, we grouped all tags and functions into their most familiar categories according to how they are thought of in real-world development. Macromedia, for example, categorizes DateFormat() as a display function and Now() as a date function. Putting these functions into separate categories may be true technically, but don t you really consider both these functions to be date-related We do, and so do many new ColdFusion developers struggling to learn the language, so we have grouped all functions that are most commonly used to work with dates and date-related issues under a common heading.
Part IX ColdFusion MX Language Reference
Second, we didn t separate tags from functions. Why do this Wouldn t discussing QueryNew() alongside CFQUERY make better sense than separating them We think so. Now, whenever you have a language-related question about working with databases or the queries that they produce, you just flip to 52, and all the tags and functions that you need are right there in one place. Seeing all the tags and functions related to a specific topic together can often inspire you to intelligently solve a problem by using tags and functions that you never before considered. We didn t, however, do away with alphabetizing tags and functions for quick reference. As in the case in traditional references, we include separate alphabetical listings of tags and functions in the following sections so that you can quickly find the reference for a specific item. We also separate tags and functions into their own alphabetical groups within each topicspecific section in each chapter.
How to read the listings
Keep the following points in mind in reading through the language reference: To avoid confusion, if a tag or function has multiple forms of use, each is listed with only the attributes used in that form. If an attribute is required, its name appears in boldface. If an attribute accepts one of a specific set of values, each is shown separated by a pipe character | and the default value is listed first. Each specific value is listed in all caps. We sometimes use long variable names that precisely describe their contents and purpose. We group related attributes in order to show how they work together. We explicitly show where pound signs are needed around variables and where they are not. You use pound signs one way in looping over a collection, for example, and another way in looping over a query object. (See the listing for CFLOOP in 49 for details.) We sometimes use actual values in place of variables if the resulting description is more clear and straightforward. The value of the applicationTimeout attribute of the CFAPPLICATION tag, for example, is simply #CreateTimeSpan(2,0,0,0)# rather than #CreateTimeSpan(days, hours, minutes, seconds)#, because the former is very close to what you may typically use, and we re not trying to explain how CreateTimeSpan() works. In listing a function, we boldface the data type returned. We list only those tags and functions that are operable in ColdFusion MX. We hope that you like your Language Reference!