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CS122B: Projects in Databases and Web Applications Winter 201 9

Learn about pagination, caching, sorting, searching, and browsing in databases and web applications. Explore examples and techniques for efficient data retrieval and display.

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CS122B: Projects in Databases and Web Applications Winter 201 9

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  1. CS122B: Projects in Databases and Web Applications Winter 2019 Professor Chen Li Department of Computer Science UC Irvine Notes 05: Pagination,Caching, Sort, Search, Browse

  2. Pagination • Showresultsindifferentpages

  3. SQLSupport SELECT columns FROM table LIMIT 20 OFFSET 10

  4. EmbeddingparametersinGETrequests Example: https://www.autotrader.com/cars-for-sale/Sedan/Irvine+CA-92604?zip=92604&startYear=1981&numRecords=25&sortBy=derivedpriceDESC&vehicleStyleCodes=SEDAN&firstRecord=0&endYear=2019&searchRadius=10

  5. Caching in Tomcat • Storethequeryresultsasanobject • Laterrequestscanbeservedusingthecachewithoutqueryingthedatabase

  6. Caching in Tomcat • Pros: • LesstrafficonDB • Lowresponsetime • Cons: • Memoryoverheadinwebserver • Resultsmaybeobsolete

  7. Searching/Browsing

  8. Different queries • Browsing: SELECT * FROM Movies, genres, genres_in_movies WHERE genres.name = “action” • Searching: SELECT * FROM Movies WHERE title LIKE “%term%”;

  9. Same page of movie list • Implement a Java Servlet program by taking a SQL query as a parameter • Show the results of the query as a list of movies.

  10. Sorting • Frontend GET request includes a sorting parameter such as “DESC” and “ASCE”; • Use “ORDER BY” in SQL to sort the results

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