Databases on the web

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Geoffrey Fowler
5 years ago
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1 Databases on the web

2 The Web Application Stack Network Server You

3 The Web Application Stack Network Server You

4 The Web Application Stack Web Browser Network Server You

5 The Web Application Stack Web Browser Network Server You

6 The Web Application Stack Web Server Web Browser Network Server You

7 Let s make a webpage to advertise sailors and boats <html> <body> <h1>sailors and Boats</h1> <ul> <h3>sailors: id name rank</h3> <li>64 Horatio 7</li> <li>74 Horatio 9</li> <li>22 Dustin 1</li> <li>31 Lubber 8</li> </ul> <ul> <h3>boats: id name color</h3> <li>102 Interlake red</li> <li>103 Clipper green</li> <li>104 Marine red</li> </ul> </body> </html>

8 Let s make a webpage to advertise sailors and boats <html> <body> <h1>sailors and Boats</h1> <ul> <h3>sailors: id name rank</h3> <li>64 Horatio 7</li> <li>74 Horatio 9</li> <li>22 Dustin 1</li> <li>31 Lubber 8</li> </ul> <ul> <h3>boats: id name color</h3> <li>102 Interlake red</li> <li>103 Clipper green</li> <li>104 Marine red</li> </ul> </body> </html> It would be nice if we could use our sailors database to do this.

9 The Web Application Stack Persistent Data Storage Web Server Web Browser Network Server You

10 The Web Application Stack Application Persistent Data Storage Web Server Web Browser Network Server You

11 The Web Application Stack Application Persistent Data Storage Web Server PHP Postgres Network Web Browser Server You

12 PHP PHP Hypertext Preprocessor Syntax is similar to C Object Oriented Extensions Scripting language Interpreted, not compiled Executed on the webserver Script written inside <?php?> tags

13 PHP continued Variables Prefixed by a $ Do not have to be declared with a data type Can change type

14 PHP continued Functions function myfunction($param) { } Useful built-in print_r, var_dump(), var_export() print, echo, printf

15 PHP continued Operators =,+=,-=,/=,*=,%=,++,-- +,-,/,*,%.=. ==,!=, <>, <, <=, >=,> === true if arguments are equal and the same data type!== true if arguments are not equal or they are not of the same data type

16 PHP continued Arrays Can be any size and any/mixed type Are not defined with their size $array = array(1,2,3); $array[0] = foo ; $array[] = 12; May be multidimensional $md_array[0] = $array; $md_array[1] = array(1, foo,34);

17 PHP continued Arrays continued PHP arrays are associative Instead of using numbered indexes we can have named keys $array[ fname ] = alice ; $array[ lname ] = smith ; $array[ age ] = 48; $array = array ( $key => $value, ); $array = array ( fname => alice, lname => smith, age => 48, );

18 PHP continued Control Structures if/elseif/else if, else switch while, do{}while, for foreach foreach ($array as $value){} foreach ($array as $key => $value) {}

19 PHP continued Connecting to a database Can do low-level like embedded sql in C Drivers for Mysql Postgres Mssql Odbc Sqlite Or we can use an abstraction layer A consitent interface across multiple databases Abstracts away many of the details A couple of different choices DBA dbx ODBC PDO

20 PDO Compare PDO and embedded C A little bit about password security Permissions CGI CGI example» A little bit about errors On MCECS systems look at /www/log/users-error.log

21 PDO Now lets make our sailors and boats page dynamic

22 PDO Now lets make a reservation system Html forms Global arrays $_GET $_POST

23 The Web Application Stack Application Persistent Data Storage Web Server Php, perl, python Mysql Apache Linux Server LAMP

24 The Web Application Stack Application Persistent Data Storage Web Server Asp Sql Server IIS Windows Server WISA

25 The Web Application Stack Application Persistent Data Storage Web Server Java * Tomcat * Server

26 The Web Application Stack Application Persistent Data Storage Web Server java,php,perl,python,ruby,erlang, haskell, Mysql,sql server,postgres,oracle, sqlite, NoSQL, Apache, IIS, lighttpd, tomcat, rails, nodejs, Linux,windows,solaris,freebsd, apple, Server

What is PHP? [1] Figure 1 [1]

What is PHP? [1] Figure 1 [1] PHP What is PHP? [1] PHP is an acronym for "PHP: Hypertext Preprocessor" PHP is a widely-used, open source scripting language PHP scripts are executed on the server PHP is free to download and use Figure