Database Systems: Design, Implementation, and Management Eighth Edition Chapter 14 Database Connectivity and Web Technologies.

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Presentation transcript:

Database Systems: Design, Implementation, and Management Eighth Edition Chapter 14 Database Connectivity and Web Technologies

Database Systems, 8 th Edition 2 Internet Databases Web database connectivity allows new innovative services that: –Permit rapid response by bringing new services and products to market quickly –Increase customer satisfaction through creation of Web-based support services –Yield fast and effective information dissemination through universal access

Database Systems, 8 th Edition 3

4 Web-to-Database Middleware: Server-Side Extensions Web server is the main hub through which Internet services are accessed Dynamic Web pages are at the heart of current generation Web sites Server-side extension: a program that interacts directly with the Web server –Also known as Web-to-database middleware Middleware must be well integrated

Database Systems, 8 th Edition 5

6 Web Server Interfaces Two well-defined Web server interfaces: –Common Gateway Interface (CGI) –Application Programming Interface (API) Disadvantage of CGI scripts: –Loading external script decreases system performance –Language and method used to create script also decrease performance API is more efficient than CGI –API is treated as part of Web server program

Database Systems, 8 th Edition 7 The Web Browser Software that lets users navigate the Web Located in client computer Interprets HTML code received from Web server Presents different page components in standard way Web is a stateless system: Web server does not know the status of any clients

Database Systems, 8 th Edition 8 Client-Side Extensions Add functionality to Web browser Three general types: –Plug-ins –Java and JavaScript –ActiveX and VBScript

Database Systems, 8 th Edition 9

10 Client-Side Extensions (continued) Plug-in: an external application automatically invoked by the browser when needed Java and JavaScript: embedded in Web page –Downloaded with the Web page and activated by an event ActiveX and VBScript: embedded in Web page –Downloaded with page and activated by event –Oriented to Windows applications