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INTERNET DATABASE Internet and E-commerce Internet – a worldwide collection of interconnected computer network E-commerce – customers can place and pay for orders via the business’s 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 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 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 client’s request Web page – text written in HTML, static and dynamic 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 Client Functions Can be extended : Plug-ins – browser can activate automatically when required (extend a system/application) Active-X – Microsoft’s 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 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 Web server interface Web server provide standard interface to communicate with external program Two common interfaces : Application Programming Interface (API) Common Gateway Interface (CGI) 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 Internet / Intranet and its Security Firewall – a software / hardware components that limits and control : Data traffic to an organization’s database from the outside world Data that are permitted to flow from an organization the outside world. END