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Stored procedures
5. Principle for displaying a WEBDEV Session site
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WEBDEV session
The following operations are performed when displaying a WEBDEV page in Session mode:
  1. Request page display.
  2. Start WEBDEV engine. This engine remains on the server until the application is closed.
  3. Create the application context. This context remains on the server until the application is closed.
  4. The WEBDEV engine runs the server code and builds the HTML page (e.g., from the data in the database).
  5. Once the HTML page is entirely built, the server transmits the result to the client (the browser).
Page contexts
A page context is automatically created on the server whenever a page is displayed in the browser. This page context contains all elements that have been required to build the page viewed by the Web user:
  • global variables,
  • local variables,
  • server processes,
  • database connections,
  • contexts of data files, etc.
The page contexts remain in memory on the server until the end of the WEBDEV session.
When the same page is called several times:
  • If PageDisplay is called to display the page, the page context is destroyed and re-created.
  • If PageRefresh is called to display the page, the same page context is re-used.
Programming
The WEBDEV session and the page contexts are automatically managed by default. No programming is required.
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