Variables In Cold Fusion>>
In this article I'm going to cover one of the most fundamental
things that is in every programming language. Variables, now don't
get scared, in ColdFusion they're dead easy to use. Unlike Dynamic
SQL statements in ASP, they won't make your brain hurt. For those of
you who don't know what Variables are, they're exactly what they say
they are. You use them to make your applications do things based on
what gets sent into the application. In ColdFusion all variables are
in cased in # (Hash signs or pound signs depending on
where you're from) hence #variablename# will be
replaced by whatever value is tied to that variable.
In ColdFusion there are many different variable types, perhaps
more so than in other programming languages. Different variable
types exist due to the places that they originate from and how they
are created. The following list should explain what they're
about.
| VariableType |
Description of Variable use |
| Local |
These variables are created with the CFSET or
CFPARAM tag in a template. |
| URL |
These dead useful variables represent values append onto
the end of a URL. e.g. <A
href="http://www.go.com/file.cfm?name=John> example
</A> |
| CGI |
This type will give you access to so called
"environmental" variables, things like the server name, what
browser the user is using and some HTTP header info. |
| Cookie |
Allows access to the values held inside cookies, 'nuf
said. |
| Query |
Access variables from a particular query. |
| Form |
Get the values of information input and submitted via
forms. |
| Client |
Variables associated with a particular user or client.
|
| Server |
These are a part of the webserver, like server version
etc. |
| Session |
These are really cool (or maybe I should get out more),
they, in short, are linked to a browser session, e.g., the
server tracks the user and stores variables connected to the
browser. |
| Application |
These are tied to a particular application I'll cover
these when I get to the ColdFusion Application Framework.
|
|
