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Web-Database Integration
Week 8
LBSC 690
Information Technology
Agenda
• Questions
• PHP
• SQL
• Midterm review
Ways of Generating Web Pages
• Static: Written in a markup language– HTML, XML
• Dynamic: Generated using a program– Common Gateway Interface (.cgi)– Java servlets
• Dynamic: Generated from a database– Cold Fusion (.cfm)– PHP (.php)
Why Database-Generated Pages?
• Remote access to a database – Client does not need the database software
• Serve rapidly changing information– e.g., Airline reservation systems
• Provide multiple “access points”– By subject, by date, by author, …
• Record user responses in the database
Three Ways to Serve Data
WebBrowser
Cold FusionServer
MicrosoftAccess
MicrosoftWeb Server
.mdb
PHP-enabledWeb Server
mysqlDBMS
mysqldatabase
Data Access Pages
PHP Examples
• Demo 1: a “Hello World” program
• Demo 2: Reading input from a form
• Demo 3: Printing output from a table
Structured Query Language
DESCRIBE Flight;
Structured Query Language
SELECT * FROM Flight;
Structured Query Language
SELECT Company.CompanyName, Company.CompanyPhone, Flight.Origin, Flight.DepartureTime
FROM Flight,Company
WHERE Flight.CompanyName=Company.CompanyName
AND Flight.AvailableSeats>3;
The mysql DBMS
mysql –u dbname –h host –p password
show databases;
use RentAPlane;
show tables;
describe Flight;
select * from Flight;
insert into …
Cold Fusion<HTML>
<HEAD>
<TITLE>Show All Students in Our School</TITLE> <CFQUERY NAME=“allStudents” DATASOURCE=“student20”>
SELECT * FROM Students
</CFQUERY> </HEAD>
<BODY BGCOLOR="LIGHTBLUE"> <H2> <B>All Students in Our School</B> </H2> <BR> <hr> <pre> studentID FirstName MiddleName LastName<br></pre>
<CFOUTPUT QUERY="allStudents"> <PRE> #studentID# #FirstName# #MiddleName# #LastName# </PRE>
</CFOUTPUT> <FORM ACTION="mainMenu.cfm" Method="post">
<input type="submit" value="Main Menu"> </FORM>
</BODY> </HTML>
Must be the same name
CF variables
SQL in ColdFusion
• Show who borrowed which book
<CFQUERY name="borrowedBook" dataSource="student20"> SELECT Books.Title, Students.FirstName, Students.MiddleName,
Students.LastName, Checkout.DueDate FROM Books, Students, Checkout WHERE Books.BookID=Checkout.BookID AND
Students.StudentID=Checkout.StudentID;</CFQUERY>
The Grand Plan
Networks
XML
Multimedia
Computers
Interaction
Search
Communication
Web
Life Cycle
PolicyDatabases
Programming
Web Databases
Midterm
Project
Final
Quiz
The Midterm
• Quiz/homework should be good preparation– A variety of question types– Some questions will require computer use
• Lots of prior exams are available– Many have solutions available
• Open book/notes/Internet/mind/…– Just don’t get help from another person
Computer Systems
• Hardware – Types of hardware– Storage hierarchy– Moore’s law
• Software– Types of software– Types of interfaces
Networks
• Types of Networks– LAN, WAN, Internet, Wireless
• Packet Switching– Ethernet, routers, routing tables
• Layered Architecture and protocols– TCP/UDP
– IP address/domain name
• Encryption
Structured Documents
My Browser
• The Web– HTTP, HTML, URL
• XML
Multimedia• Compression, compression, compression
– Image: lossy vs loseless– Video: frames are alike– Speech: voice predictable– Music: masking
• Streaming
Media Sever
Internet
Buffer
Human-Computer Interaction
• Input and output devices
• Mental models
• Interaction styles– Direct manipulation, menus, command line
Programming• Programming languages
– Machines require low-level specific instructions
– Humans require high-level abstraction
• Can create any behavior from 3 control structures– Sequential execution
– Conditional
– Iteration
• Javascript interpreters are in Web browsers
Databases• Structured information
– Field->record->table->database
– Primary key
• Normalized tables (relations)– Remove redundancy, inconsistency, error
– Easy update, search
• Join links tables together– Through foreign key
• Access provides visual operations
Web-Database Integration
• Access “Data Access Pages”
• PHP
• SQL
