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Oracle Tips by Burleson |
Processes
A Page Process is the control that executes
programming logic in the form of SQL statements, PL/SQL, API calls in
the HTML DB engine, and more. This is where data updates are
performed to data in the database. There are application level
processes, page rendering processes, and page level processes executed
when the page is submitted. They are the same functionally, but
differ in where they are defined with HTML DB.
Application Level processes are defined in Shared
Components with the Application Processes link. An application level
process can later be called by a page level On Demand process.
Process Types
When the wizard is first started to create a
process, the developer will choose which kind of process to create.
This depends largely on what the process needs to accomplish.
PL/SQL
The PL/SQL
process is the most common type of process that will be used. Do not
let the title PL/SQL deceive you because a simple select statement can
also be written for this type of process. In fact, it is quite common
to use a Before Region PL/SQL process to populate items on the page.
This can be done using several SQL select statements in a single
PL/SQL process. An entire Anonymous PL/SQL block can also be entered
to be executed in this type of process.
A PL/SQL page process After Submit is common for
inserting, updating, or deleting data from the database.
Reset Pagination
A Reset
Pagination process is used to set the pagination of a report back to
the beginning of the result set. This was presented in detail in a
previous chapter of this book.
On Demand
An On Demand process is a special process that
will execute an Application Level process from the page level. It
provides a mechanism for sharing processes among pages, but it must be
defined globally at the application level.
On Demand – at the Application Level is called by
the On Demand page level process or through the URL.
The syntax to execute an On Demand process in the
URL is:
f?p=APP_ID:PAGE_ID:SESSION:APPLICATION_PROCESS=process_name
The
above book excerpt is from:
Easy HTML-DB
Oracle Application Express
Create Dynamic
Web Pages with OAE
ISBN 0-9761573-1-4
Michael Cunningham & Kent Crotty
http://www.rampant-books.com/book_2005_2_html_db.htm
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