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Accessing Your MySQL Database from the Web with PHP

Nov 26, 2008, 01:33 (0 Talkback[s])
(Other stories by Luke Welling, Laura Thomson)

"In Chapter 8, "Designing Your Web Database, "we outlined how web database architectures work. Just to remind you, here are the steps:

  1. A user's web browser issues an HTTP request for a particular web page. For example, the user might have requested a search for all the books written by Michael Morgan at Book-O-Rama, using an HTML form. The search results page is called results.php.
  2. The web server receives the request for results.php, retrieves the file, and passes it to the PHP engine for processing.
  3. The PHP engine begins parsing the script. Inside the script is a command to connect to the database and execute a query (perform the search for books). PHP opens a connection to the MySQL server and sends on the appropriate query.
  4. The MySQL server receives the database query, processes it, and sends the results-a list of books-back to the PHP engine.
  5. The PHP engine finishes running the script. This usually involves formatting the query results nicely in HTML. It then returns the resulting HTML to the web server. The web server passes the HTML back to the browser, where the user can see the list of books she requested.
"Now you have an existing MySQL database, so you can write the PHP code to perform the preceding steps.Begin with the search form. The code for this plain HTML form is shown in Listing 11.1."

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