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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=us-ascii" /> <meta http-equiv="Content-Style-Type" content="text/css" /> <meta http-equiv="Content-Script-Type" content="text/javascript" /> <title>About On Demand Application Processes</title> <meta name="generator" content="Oracle DARB XHTML Converter (Mode = ohj/ohw) - Version 5.1" /> <meta name="date" content="2009-04-14T16:11:27Z" /> <meta name="robots" content="noarchive" /> <meta name="doctitle" content="About On Demand Application Processes" /> <meta name="relnum" content="Release 3.2" /> <meta name="partnum" content="E11947-01" /> <link rel="copyright" href="dcommon/html/cpyr.htm" title="Copyright" type="text/html" /> <link rel="stylesheet" href="dcommon/css/blafdoc.css" title="Oracle BLAFDoc" type="text/css" /> <link rel="contents" href="toc.htm" title="Contents" type="text/html" /> <link rel="up" href="preface.htm" title="Home" type="text/html" /> <link rel="up" href="bldr_pgs.htm" title="Working with Application Pages" type="text/html" /> <link rel="up" href="bldr_app_proc.htm" title="Understanding Application P..." type="text/html" /> <link rel="up" href="bldr_app_proc_ondemand.htm" title="About On Demand Application..." type="text/html" /> <link rel="prev" href="bldr_app_proc.htm" title="Previous" type="text/html" /> <link rel="next" href="bldr_app_proc_example.htm" title="Next" type="text/html" /> </head> <body> <p id="BREADCRUMBING"><a href="preface.htm" title="Home">Home</a> > <a href="bldr_pgs.htm" title="Working with Application Pages">Working with Application Pages</a> > <a href="bldr_app_proc.htm" title="Understanding Application P...">Understanding Application P...</a> > About On Demand Application...</p> <table class="simple oac_no_warn" summary="" cellspacing="0" cellpadding="0" width="100%"> <col width="86%" /> <col width="*" /> <tr valign="bottom"> <td align="left"></td> <td align="center"><a href="bldr_app_proc.htm"><img src="dcommon/gifs/leftnav.gif" alt="Previous" /><br /> <span class="icon">Previous</span></a> </td> <td align="center"><a href="bldr_app_proc_example.htm"><img src="dcommon/gifs/rightnav.gif" alt="Next" /><br /> <span class="icon">Next</span></a></td> </tr> </table> <p><a id="BABEAIIE" name="BABEAIIE"></a></p> <div class="sect2"><!-- infolevel="all" infotype="General" --> <h1><a name="HTMDB25209" id="HTMDB25209"></a>About On Demand Application Processes<a id="sthref747" name="sthref747"></a></h1> <p>A special type of application process is the <span class="bold">On Demand</span> process. An On Demand application process has a Process Point of <span class="bold">On Demand</span> and executes when called from a page-level On Demand process. On Demand processes are useful when you have PL/SQL logic that you would like to run from different execution points across multiple pages.</p> <div align="center"> <div class="inftblnotealso"><br /> <table class="NoteAlso oac_no_warn" summary="" cellpadding="3" cellspacing="0"> <tbody> <tr> <td align="left"> <p class="notep1">See Also:</p> <a href="bldr_pg_procs_about.htm#BABEHDGA">"Creating a Page Process"</a></td> </tr> </tbody> </table> <br /></div> <!-- class="inftblnotealso" --></div> <div class="sect3"><!-- infolevel="all" infotype="General" --><a id="sthref748" name="sthref748"></a> <h2><a name="HTMDB25210" id="HTMDB25210"></a>Running an On Demand Process from a Page Request</h2> <p>You can have a page request run an On Demand process by using the following syntax:</p> <pre xml:space="preserve" class="oac_no_warn"> f?p=application_id:page_id:session:APPLICATION_PROCESS=process_id </pre> <p>Where:</p> <ul> <li> <p><code><span class="codeinlineitalic">application_id</span></code> is the application ID or alphanumeric alias</p> </li> <li> <p><code><span class="codeinlineitalic">page_id</span></code> is the page number or alphanumeric alias</p> </li> <li> <p><code><span class="codeinlineitalic">session</span></code> is the session ID</p> </li> <li> <p><code><span class="codeinlineitalic">APPLICATION_PROCESS=process_id</span></code> is the keyword <code><span class="codeinlineitalic">APPLICATION_PROCESS=</span></code> followed by either the process ID or an alphanumeric name of an application-level process having a Process Point of On Demand</p> </li> </ul> <p>When you use this syntax, the Application Express engine recognizes the request and processes it using the following rules:</p> <ul> <li> <p>The page number in the URL can be any page number or alias. A page number or alias is required in the request only as a syntactic placeholder because no specific page is accessed for this type of request.</p> </li> <li> <p>The process authorization scheme, the application's authorization scheme, and the process conditions are supported.</p> </li> <li> <p>Session state (that is, item names and values) may be set in the URL, but clear cache options are ignored.</p> </li> <li> <p>Any failures of authentication, authorization, or process conditions do not result in visible error messages or other indicators of such failures and most often result in a blank page being displayed.</p> </li> <li> <p>Specifying the process by name locates the first process with the specified (case-preserved) name.</p> </li> </ul> <div align="center"> <div class="inftblnotealso"><br /> <table class="NoteAlso oac_no_warn" summary="" cellpadding="3" cellspacing="0"> <tbody> <tr> <td align="left"> <p class="notep1">See Also:</p> <a href="concept_ses_clear.htm#BEIHCICF">"Clearing Session State"</a></td> </tr> </tbody> </table> <br /></div> <!-- class="inftblnotealso" --></div> </div> <!-- class="sect3" --></div> <!-- class="sect2" --> <!-- Start Footer --> <div class="footer"> <table class="simple oac_no_warn" summary="" cellspacing="0" cellpadding="0" width="100%"> <col width="86%" /> <col width="*" /> <tr> <td align="left"><span class="copyrightlogo">Copyright © 2003, 2009, Oracle and/or its affiliates. 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