What are the scopes in ColdFusion?
If you use a variable name without a scope prefix, ColdFusion checks the scopes in the following order to find the variable:
- Local (function-local, UDFs and CFCs only)
- Arguments.
- Thread local (inside threads only)
- Query (not a true scope; variables in query loops)
- Thread.
- Variables.
- CGI.
- Cffile.
What is Cfparam in ColdFusion?
Usage. You can use this tag to make the following tests: To test whether a required variable exists, use this tag with only the name attribute. If it does not exist, ColdFusion stops processing the page and returns an error.
What is application CFC in ColdFusion?
Application event handlers are CFC methods that ColdFusion automatically executes when specific events occur during the lifetime of an application: application start and end, session start and end, request start, execution, and end, and exceptions.
Is ColdFusion outdated?
It’s been over two decades since ColdFusion made its way to the developer community. With thousands of programming languages, ColdFusion is still alive and thriving.
How do you declare a variable in ColdFusion?
You create most ColdFusion variables by assigning them values. (You must use the ArrayNew function to create arrays.) Most commonly, you create variables by using the cfset tag. You can also use the cfparam tag, and assignment statements in CFScript.
What is Application cfm?
Often, an Application. cfm page uses one or more cfinclude tags to include libraries of commonly used code, such as user-defined functions, that are required on many of the application’s pages.
What is Cfcomponent?
Description. Creates and defines a component object; encloses functionality that you build in CFML and enclose in cffunction tags. This tag contains one or more cffunction tags that define methods. Code within the body of this tag, other than cffunction tags, is executed when the component is instantiated.
How does ColdFusion set value?
To set a ColdFusion variable, use the tag. To output the variable, you need to surround the variable name with hash ( # ) symbols and enclose it within tags.
What is Cfoutput?
Displays output that can contain the results of processing CFML variables and functions. You can use the query attribute to loop over the result set of a database query.
What is the use of application CFM in ColdFusion?
Names the application, enables Client and Session scope variables, and sets the client variable store to the myCompany data source. Ensures that debugging output is not displayed, if the ColdFusion Administrator enables it.
How do I use named Scopes in ColdFusion?
ColdFusion makes all named scopes available as structures. You cannot access the function-local scope for user-defined functions (UDFs) that you define using CFScript as a structure. You can reference the variables in named scopes as elements of a structure. To do so, specify the scope name as the structure name and the variable name as the key.
What are ColdFusion variables?
Variables that are created and changed inside a ColdFusion thread, but can be read by all code on the page that creates the thread. Each thread has a Thread scope that is a subscope of a cfthread scope. For more information, see Using ColdFusion Threads. Variables that are available only within a ColdFusion thread.
Do ColdFusion scopes apply to CFX tags?
ColdFusion scopes do not apply to ColdFusion Extension (CFX) tags, custom tags that you write in a programming language such as C++ or Java. The ColdFusion page that calls a CFX tag must use tag attributes to pass data to the CFX tag.
How do I add parameters to a ColdFusion URL?
The parameters are appended to the URL in the format?variablename = value&variablename=value…; for example www.MyCompany.com/inputpage.cfm?productCode=A12CD1510&quantity=3. If a URL includes multiple parameters with the same name, the resulting variable in the ColdFusion URL scope consists of all parameter values separated by commas.