Instructor: Betty O Neil
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1 Introduction to Web Application Development, for CS437/637 Instructor: Betty O Neil 1
2 Introduction: Internet vs. World Wide Web Internet is an interconnected network of thousands of networks and millions of computers (sometimes called host computers or just hosts). The World Wide Web, or Web for short, is one of the Internet s most popular services, providing access to over one billion Web pages. The Web runs over the Internet, using its ability to transfer data reliably (using TCP). Instructor: Wei Ding 2
3 Internet Users Source: Instructor: Wei Ding 3
4 How the Internet evolved The Internet, then known as ARPANET (Advanced Research Projects Agency Network), began in 1969, soon file transfers, s were flowing. The current TCP/IP protocols date from The Internet was already international then, but restricted to non-commercial use. In 1990, it was opened to commercial use. Instructor: Wei Ding 4
5 A Hierarchy of Networks Every computer that is connected to the Internet is part of a network. You may use a cable or DSL modem to an Internet Service Provider (ISP). At work, you may be part of a local area network (LAN) using an ISP that your company has contracted with. When you connect to your ISP, you become part of their network. The ISP may then connect to a larger network and become part of their network. The Internet is simply a network of networks. Instructor: Wei Ding 5
6 The architecture of the Internet LAN LAN LAN LAN LAN WAN IXP WAN LAN IXP IXP LAN WAN WAN LAN LAN LAN LAN LAN Murach's PHP and MySQL, C1 2014, Mike Murach & Associates, Inc. Slide 6
7 Luckily, the Internet can be viewed like this for our purposes Client The Internet Web Server Database Server Client Server Murach's PHP and MySQL, C1 2014, Mike Murach & Associates, Inc. Slide 7
8 Internet Domain Naming System Provides unique ids for all the hosts directly connected to the Internet Example hostname = a unique hostname across the Internet. This host also has hostname vm52.cs.umb.edu. Domain naming system (in use since 1983): Top-level domain name: edu UMB s domain name: umb.edu Departmental subdomain: cs.umb.edu Full hostname = specifying the departmental web server host The Internet s Domain Naming Service (DNS) servers translate a human-readable domain name into the machine-readable IP address. The IP address of is , also unique across the Internet Instructor: Wei Ding 8
9 The World Wide Web The Web runs over the Internet, using its ability to transfer data reliably (using TCP) and specify hosts with domain names and IP addresses. The Web dates from the early 90s. Since the Internet was already an international presence, so was the Web. Instructor: Wei Ding 9
10 Web Accessibility Web accessibility means that people with disabilities can use the Web. More specifically, Web accessibility means that people with disabilities can perceive, understand, navigate, and interact with the Web, and that they can contribute to the Web. HTML plays an important role by providing a standard way of describing what s on the screen. Instructor: Wei Ding 10
11 Uniform Resource Locator (URL) A simple URL has the following format: <protocol> :// <hostname or IP address> / <path> Example: (our class homepage) Here hostname = Using IP address: Instructor: Wei Ding 11
12 How static web pages are processed HTTP request HTTP response HTML file Web Browser Web Server HTTP is the protocol that underlies every web request (from about 1990) It uses TCP, the reliable data stream protocol of the Internet Murach's PHP and MySQL, C1 2014, Mike Murach & Associates, Inc. Slide 12
13 A simple HTTP request GET / HTTP/1.1 Host: A simple HTTP response HTTP/ OK Content-Type: text/html Content-Length: 136 Server: Apache/2.2.3 <html> <head> <title>example Web Page</title> </head> <body> <p>this is a sample web page</p> </body> </html> Murach's PHP and MySQL, C1 2014, Mike Murach & Associates, Inc. Slide 13
14 A simple HTTP request GET / HTTP/1.1 Host: A simple HTTP response HTTP/ OK Content-Type: text/html Content-Length: 136 Server: Apache/2.2.3 <html> <head> <title>example Web Page</title> </head> <body> <p>this is a sample web page</p> </body> </html> If this HTML text was just read from a file on the server, this is static HTML. If a program helped generate it, it is dynamic HTML. Murach's PHP and MySQL, C1 2014, Mike Murach & Associates, Inc. Slide 14
15 How dynamic web pages are processed with PHP HTTP request HTTP response Web Browser Web Server Database Server PHP Script Murach's PHP and MySQL, C1 2014, Mike Murach & Associates, Inc. Slide 15
16 Key terms HyperText Markup Language (HTML) static web page HTTP request HTTP response. dynamic web page PHP interpreter database server render round trip Murach's PHP and MySQL, C1 2014, Mike Murach & Associates, Inc. Slide 16
17 Web browsers Chrome Firefox Internet Explorer Safari Opera Web servers Apache IIS Murach's PHP and MySQL, C1 2014, Mike Murach & Associates, Inc. Slide 17
18 Server-side languages PHP JSP ASP.NET Perl Python Database servers MySQL Oracle DB2 MS SQL Server Murach's PHP and MySQL, C1 2014, Mike Murach & Associates, Inc. Slide 18
19 Highlights in the history of PHP Version Year Description Personal Home Page PHP: Hypertext Processor Introduced the Zend Engine Introduced the Zend Engine II. Improved support for OOP Added the PHP Data Objects extension 6 -- PHP6, in development since 2006, has not yet been released Note: we ll use version 5. Murach's PHP and MySQL, C1 2014, Mike Murach & Associates, Inc. Slide 19
20 PHP Advantages Considered easy to use, focuses on web Free, open-source (implemented in C) Provides decent performance Available on many platforms PHP disadvantages no Unicode strings, so hard to provide multi-language websites. (There are libraries for Unicode) Too easy so lots of bad PHP exists, including insecure sites. Missing large-software features, like Java s package system. Murach's PHP and MySQL, C1 2014, Mike Murach & Associates, Inc. Slide 20
21 PHP Uses Small sites Prototypes for larger sites Server-side code for Javascript/Ajax running in web pages Server-side code for providing data for programs running in mobile devices Note no significant use inside mobile devices. Instructor: Wei Ding 21
22 Highlights in the history of MySQL Version Year Description The original version of MySQL Introduced support for unions Introduced support for subqueries and prepared statements Introduced support for stored procedures, triggers, views, and transactions Introduced support for row-based replication and server log tables Default storage engine now supports referential integrity Introduced support for big data. Murach's PHP and MySQL, C1 2014, Mike Murach & Associates, Inc. Slide 22
23 MySQL notes MySQL is owned and sponsored by MySQL AB, a for-profit firm. In 2008, Sun Microsystems acquired MySQL AB. In 2009, Oracle Corporation acquired Sun Microsystems. In 2009, many of the original developers of MySQL left MySQL AB and begin working on different forks of the open-source code. One of the most popular of these forks is MariaDB. In 2012, tech writers reported that Oracle was holding back MySQL Server test cases and no longer synchronizing their changes with the public source repository. Also, several Linux distributions, Wikipedia and Google, began to replace MySQL with MariaDB. Murach's PHP and MySQL, C1 2014, Mike Murach & Associates, Inc. Slide 23
24 Hello World in PHP Source file hello.php: <?php echo 'Hello World!';?> Local execution: use php command Note no compilation step! It s a scripting language. $ php hello.php Hello World! $ Normal execution: put hello.php in right place for web server execution, say in c:\xampp\htdocs Browse to see: Hello World! Instructor: Wei Ding 24
25 PHP derives lots of its syntax from C, so does Java Familiar control structures, increment operators Variable names in use are prefixed with $ Java-type comments or # line comments // calculate the future value $future_value = $investment; for ($i = 1; $i <= $years; $i++) { $future_value = $future_value + ($future_value * $interest_rate *.01); } Could rewrite last assignment, as in Java, with +=: $future_value += $future_value*$interest_rate*.01; Instructor: Wei Ding 25
26 But PHP has differences too Good news! Associative Arrays C/Java: only integers can be used as array indexes PHP and other scripting languages: We can use strings as keys in array lookup! Example, pg. 321 $tax_rates = array(); // or = []; $tax_rates[ NC ] = 7.75; $tax_rates[ CS ] = 8.25; // Akk! $payment = $price*(1+$tax_rates[$state]); Instructor: Wei Ding 26
27 PHP is loosely, dynamically typed $x = 12; // an integer $x = 2.3; // now a double $x = null; // now a null $x = abc ; // now a string $x remembers its type, determined from the value on the rhs of the assignment. Good programming practice: types should be kept as static as possible Netbeans complains on multiple assignments to a variable, even of the same type values. Instructor: Wei Ding 27
28 PHP is made for web apps It maintains global arrays for easy access to HTTP request parameters, HTTP headers, session variables, and cookies. Don t worry if this doesn t make sense yet! Instructor: Wei Ding 28
29 Next time: HTML (HTML5) Unfortunately, not covered in M&H See recommended book on syllabus HW1: get started as soon as possible! Instructor: Wei Ding 29
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