INFM 603: Information Technology and Organizational Context Jimmy Lin The iSchool University of Maryland Thursday, October 18, 2012 Session 7: PHP.

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Presentation transcript:

INFM 603: Information Technology and Organizational Context Jimmy Lin The iSchool University of Maryland Thursday, October 18, 2012 Session 7: PHP

Databases Yesterday…

Databases today… Wait, but these are websites?

Websites that are really databases Most of the content is in a database Web pages are dynamically constructed from results of database queries

Multi-Tiered Architectures Browser Database Browser Client Server Web Server “Middleware” Web Server Database

Putting the Pieces Together… Web Server HTML CGI Browser SQL query Results Database (MySQL) PHP

What is PHP? PHP is a server-side scripting language Must run on a server (not in the browser) More specifically, runs inside the web server Typical PHP script: Fetches input from user forms Executes SQL queries Constructs an HTML page containing results Part of the “LAMP” stack Linux, Apache, MySQL, PHP

PHP Scripts Are just like normal HTML pages With the exception of code between Variables begin with dollar signs E.g., $a, $b Use “echo” to output HTML Just like document.writeln(…) in JavaScript Use “.” to concatenate string E.g., “here is”. “ some text” Just like “here is” + “ some text” in JavaScript

Sample PHP Script 1. Get input from user from 2. Connect to the database 3. Execute SQL query 4. Process results to generate HTML

RideShare Exercise Design a database to match drivers with passengers for ride sharing on long car trips: Drivers post available seats; they want to know about interested passengers Passengers come looking for rides: they want to know about available rides and can make reservations These things happen in no particular order To simplify, passengers don’t get to post “rides wanted” ads Build a web application to accomplish the above

RideShare Exercise: Tasks Design the tables you will need First decide what information you need to keep track of Then design tables to capture this information Design SQL queries What happens when a passenger comes looking for a ride? What happens when a driver comes to find out who the passengers are? Role play!