
onApplicationStart
949
onApplicationStart
Description
Runs when ColdFusion MX receives the first request for a page in the application.
Syntax
<cffunction name="onApplicationStart" returnType="boolean">
...
<cfreturn
Boolean
>
</cffunction>
See also
onApplicationEnd
,
Method summary
, “Managing the application with Application.cfc” in
Chapter 13, “Designing and Optimizing a ColdFusion Application,” in Chapter 5,
“Application.CFC Reference,” in
ColdFusion MX Developer’s Guide
Returns
A Boolean value: True if the application startup code ran successfully; False, otherwise. You do
not need to explicitly return a True value if you omit the
cffunction
tag
returntype
attribute.
Usage
Use this method for application initialization code; for example, use it to set Application scope
variables, to determine whether a required data source or other resource is available, or to log the
application start. You do not have to lock the Application scope if you set Application variables in
this method, and you can reference Application scope variables as you normally do; for example,
as Application.myVariable.
This method can access the requested page’s Variables scope only if the Application.cfc file
includes an
onRequest
method that calls the page.
If you call this method explicitly, ColdFusion does not start the application; it does execute the
method code, but does not lock the Application scope while the method executes.
If this method throws an uncaught exception or returns False, the application does not start and
ColdFusion MX does not process any pages in the application. In this case, ColdFusion will run
the
onApplicationStart
method the next time a user requests a page in the application.
Example
The following example tests for the availability of a database. If the database is not available it
reports and logs the error, and does not start the application; if it is available, the method
initializes two Application scope variables.
<cffunction name="onApplicationStart">
<cftry>
<!--- Test whether the DB is accessible by selecting some data. --->
<cfquery name="testDB" dataSource="cfdocexamples" maxrows="2">
SELECT Emp_ID FROM employee
</cfquery>
<!--- If we get a database error, report an error to the user, log the
error information, and do not start the application. --->
<cfcatch type="database">
Содержание COLFUSION MX 7 - INSTALLING AND USING COLDFUSION MX
Страница 1: ...COLDFUSION MX7 CFML Reference...
Страница 20: ...20 Chapter 1 Reserved Words and Variables...
Страница 50: ...50 Chapter 2 ColdFusion Tags cfelse br Searching cfif cfloop cfif...
Страница 101: ...cfdefaultcase 101 cfdefaultcase cfswitch cfoutput Your grade is grade cfoutput...
Страница 115: ...cfdocumentsection 115 cfdocumentsection cfoutput cfdocument...
Страница 311: ...cfNTauthenticate 311 Please Try again H2 cfif cfoutput cfinclude template loginform cfm cfabort cfif cfif cflogin...
Страница 411: ...cftable 411 cftable body html...
Страница 515: ...Chr 515 maxlength 5 p input type Submit name input type RESET cfform...
Страница 605: ...GetEncoding 605 WriteOutput The encoding is theEncoding cfscript cfif...
Страница 629: ...GetProfileString 629 tr td input type Submit name Submit value Submit td td td tr table form...
Страница 655: ...IIf 655 cfoutput IIf Hour Now GTE 12 DE It is afternoon or evening DE It is morning cfoutput b...
Страница 664: ...664 Chapter 3 ColdFusion Functions cfelse h3 Conversion error h3 cfif...
Страница 687: ...IsStruct 687 cfoutput cfquery cfif cfoutput hr Employee Add Complete cfoutput cfcase cfswitch...
Страница 693: ...IsWDDX 693 struct data wddxPacket hr xmp cfoutput packet xmp IsWDDX returns IsWDDX packet br cfoutput...
Страница 751: ...LSDateFormat 751 hr noshade cfoutput cfloop...
Страница 861: ...StructFind 861 cfquery cfif cfoutput hr Employee Add Complete cfoutput cfcase cfswitch...
Страница 869: ...StructIsEmpty 869 cfoutput cfquery cfif cfoutput hr Employee Add Complete cfoutput cfcase cfswitch...
Страница 903: ...Val 903 value Is the beginning numeric name form...
Страница 932: ...932 Chapter 3 ColdFusion Functions...
Страница 944: ...944 Chapter 4 ColdFusion MX Flash Form Style Reference...
Страница 962: ...962 Chapter 5 Application CFC Reference...
Страница 1008: ...1008 Chapter 6 ColdFusion MX Event Gateway Reference cfset retValue Reason reason cfreturn retValue cffunction...
Страница 1054: ...1054 Chapter 6 ColdFusion MX Event Gateway Reference...