Adobe COLDFUSION 9 Manual page 53

Developing applications

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DEVELOPING COLDFUSION 9 APPLICATIONS

The CFML Programming Language

Multiple references to an object

When multiple variables reference a structure or query object, the object continues to exist as long as at least one

reference to the object exists. The following example shows how this works:

<cfscript> depts = structnew();</cfscript>

#newStructure.John#<br>

This example displays the following output:

the value 0. However, the variable newStructure still refers to the original structure object.

Assigning objects to scopes

You can give a query or structure a different scope by assigning it to a new variable in the other scope. For example,

the following line creates a server variable, Server.SScopeQuery, using the local myquery variable:

To clear the server scope query variable, reassign the query object, as follows:

This line deletes the reference to the object from the server scope, but does not remove any other references that can

Copying and duplicating objects

You can use the

affect the original.

Using a query column

When you are not inside a tag such as

column as an array. However, query column references do not always behave as you might expect. This section

explains the behavior of references to query columns using the results of the following

SELECT FirstName, LastName

FROM Employee

To reference elements in a query column, use the row number as an array index. For example, both of the following

lines display the word "ben":

<cfoutput> #myQuery.Firstname[1]# </cfoutput><br>

<cfoutput> #myQuery["Firstname"][1]# </cfoutput><br>

tag executes, the depts variable does not reference a structure; it is a simple variable with

function to make a true copy of a structure or query object. Changes to the copy do not

Last updated 8/5/2010

attribute, you can treat a query

tag in its examples: