Description

Used with one or more cfcatch tags. Together, they catch and process exceptions in ColdFusion pages. Exceptions are events that disrupt the normal flow of instructions in a ColdFusion page, such as failed database operations, missing include files, and developer-specified events.

Category

Exception handling tags

Syntax

<cftry>
    Code that might throw an exception
    One or more cfcatch blocks
</cftry>

See also

cfcatch, cferror, cfrethrow, cfthrow, onError; "Handling Errors" 41 in the ColdFusion Developer's Guide

History

ColdFusion MX: Changed cfscript to include try and catch statements that are equivalent to the cftry and cfcatch tags.

Usage

Within a cftry block, put the code that might throw an exception, followed by one ore more cfcatch tags that catch and process exceptions. This tag requires an end tag.

Example

<!--- cftry example, using TagContext to display the tag stack. --->
<h3>cftry Example</h3>
<!--- Open a cftry block. --->
<cftry>
    <!--- Note misspelled tablename "employees" as "employeeas". --->
    <cfquery name = "TestQuery" dataSource = "cfdocexamples">
        SELECT *
        FROM EMPLOYEES
    </cfquery>

    <!--- <p>... other processing goes here --->
    <!--- specify the type of error for which we search --->
    <cfcatch type = "Database">
    <!--- the message to display --->
        <h3>You've Thrown a Database <b>Error</b></h3>
        <cfoutput>
            <!--- and the diagnostic message from the ColdFusion server --->
            <p>#cfcatch.message#</p>
            <p>Caught an exception, type = #CFCATCH.TYPE# </p>
            <p>The contents of the tag stack are:</p>
            <cfloop index = i from = 1 
                    to = #ArrayLen(CFCATCH.TAGCONTEXT)#>
                <cfset sCurrent = #CFCATCH.TAGCONTEXT[i]#>
                <br>#i# #sCurrent["ID"]# 
                    (#sCurrent["LINE"]#,#sCurrent["COLUMN"]#) 
                    #sCurrent["TEMPLATE"]#
            </cfloop>
        </cfoutput>
    </cfcatch>
</cftry>