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BBIT423/CISY423 ADBMS

BBIT423/CISY423 ADBMS. Internet/Web Databases 31.03.2011. Overview (objective of discussions) Requirements for a Web DBMS Modes of delivering databases via the web Relevant technologies Evaluation. Introduction. Web DBMS initially about dynamic web pages

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BBIT423/CISY423 ADBMS

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  1. BBIT423/CISY423ADBMS Internet/Web Databases 31.03.2011

  2. Overview (objective of discussions) • Requirements for a Web DBMS • Modes of delivering databases via the web • Relevant technologies • Evaluation

  3. Introduction • Web DBMS initially about dynamic web pages • Various ways to deliver database services over the web • Periodically dump a database table to an HTML file and make the HTML file available on the web • Provide a mechanism to query the database in real time and format the results in HTML. • Provide the web user with a form or other means to invoke a query on the database in real time. Results are formatted in HTML and returned to the user's browser.

  4. Server-side validation • Database access • User interface • Main business and data processing logic

  5. May differentiate two tier and three tier of Web- DBMS • Your examples:

  6. A note on Web Application Architectures • Model • A model is meant to serve as a computational approximation or abstraction of some real world process or system (the DBMS) • View • Visual feedback / formatting to the users (HTML) • Controller • Interprets user inputs from the user and maps these user actions into commands that are sent to the model and/or view to effect the appropriate change

  7. Web DBMS technologies • Web server • Web server extensions (scripting engines) • + client side scripting • Protocols: HTTP • Languages: HTML, XML

  8. There are two main ways to carry out dynamic real-time queries from the web: • Using traditional HTML forms, information is passed to a CGI script that formats the query and submits it to the DBMS. • Results are returned to the CGI script which then formats the output in HTML

  9. There are two main ways to carry out dynamic real-time queries from the web: • Using traditional HTML forms … • Many DBMS now have the web server built in (or closely tied) to the database. e.g., Oracle Web Applications Server. • Stored procedures in the DBMS are used to accept input from HTML forms, perform the appropriate query and then format the results in HTML

  10. Requirements for Database services over the Web (Interface) • Your database (Access, MySQL, Oracle etc) • A Web server with appropriate DBMS • A way of connecting the two (Middleware) • Scripting technologies to process the interaction

  11. Hands on experiences

  12. We need a DB first • Case of telephone extensions at KEMU • You are required to provide a web based (intranet) access to the telephone directory at KEMU • DB design • Discussion of findings and evaluated for all

  13. Web-DBMS Advantages • Simplicity • Platform Independence (Cross-Platform Support) • GUI • Standardization • Transparent Network Access • Scalable Deployment

  14. Web-DBMS Disadvantages • Security • Reliability • Bandwidth • Costs – human resources and project management • Limited functionalities • HTTP is a “stateless” protocol - does not retain information between transactions • etc

  15. Next week • Revision for the exam • Come with your questions/points of clarification • Thanks

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