INTERNET DATABASE

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• INTERNET DATABASE

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Internet and E-commerce

• Internet a worldwide collection of
  interconnected computer network
• E-commerce customers can place and pay for
  orders via the businesss web site.
• Benefits of e-commerce
• Worldwide market buy from anywhere
• Productivity no wastage of time
• Cost reduction less time energy
• Improved customer services ease the customer

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Internet Services

• E-mail to send mail and file attachment
• Worldwide web to browse for information stored
  anywhere and do business transaction
• File transfer to download and upload file
• News to join a news group
• Chat room to join a discussion or chat room

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Worldwide web

• Internet computers connected using a standard
  protocol TCP/IP
• Worldwide web resources stored on the web
• Web browser software to browse the web
• Web server software to responds to clients
  request
• Web page text written in HTML, static and
  dynamic

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Worldwide web (cont.)

• Hyperlink linking the web page
• Hypertext refer to different types of documents
• Web site refer to server and collection of the
  web pages
• http protocol used by client and server to
  communicate

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Client Functions

• Can be extended
• Plug-ins browser can activate automatically
  when required (extend a system/application)
• Active-X Microsofts specification for writing
  programs that will run inside its browser.
• VBScript Microsoft product based on Visual
  Basic
• JavaScript Netscape product
• Java runs on top of a web browser/applets

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Server Functions

• Query processing from browser (client) to server
• Browser send a web page request to the server
• Server receive the page request and validate.
  Then, pass to the middleware
• Middleware read the script, validate and execute
  it. Send SQL command to the DBMS, retrieves the
  info. And send the result back to the middleware
• Server takes and send the page to the browser

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Web server interface

• Web server provide standard interface to
  communicate with external program
• Two common interfaces
• Application Programming Interface (API)
• Common Gateway Interface (CGI)

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Internet / Intranet and its Security

• Internet - a worldwide collection of
  interconnected computer network
• Intranet an internal corporate network, LAN or
  WAN
• Benefits of intranet
• Ease of use
• Open standard
• Platform independence Runs anywhere
• Multiple data source
• Uniform interface
• Shorter development time

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Internet / Intranet and its Security

• Firewall a software / hardware components that
  limits and control
• Data traffic to an organizations database from
  the outside world
• Data that are permitted to flow from an
  organization the outside world.

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