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Here's an illustration of the process of querying a database and returning
data to the browser:
Step 1 - Web browser
requests dynamic
page.
Step 2 - Web server
finds page and
passes it to
application server.
Step 3 - Application
server scans page for
instructions.
Step 4 - Application
server sends query to
database driver.
Step 5 - Driver
executes the query
against the database.
You can use almost any database with your web application, as long as the
appropriate database driver for it is installed on the server.
Web browser
Request
WEB SERVER
<HTML>
<code>
</HTML>
Application server
Query
Database driver
Database
Response
Step 9 - Web server
sends finished page
to requesting
browser
<HTML>
<p>Hi
</HTML>
Step 8 - Application
server inserts data in
page, and then
passes the page to
the web server
Step 7 - Driver
passes recordset to
application server
Recordset
Step 6 - Recordset is
returned to driver
How a web application works 223
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