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Online Dictionary and Thesaurus

Online Dictionary and Thesaurus. Presented by: M. Khalid Akhtar. Overview. World Wide Web: How efficient ? Objective? Perl: In brief Apache: Advantages MySQL: Advantages Database Schema Some common PERL syntax used in the program The Approach Search Form Subroutines

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Online Dictionary and Thesaurus

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  1. Online Dictionary and Thesaurus Presented by: M. Khalid Akhtar

  2. Overview • World Wide Web: How efficient ? • Objective? • Perl: In brief • Apache: Advantages • MySQL: Advantages • Database Schema • Some common PERL syntax used in the program • The Approach • Search Form • Subroutines • Dictionary/Thesaurus Result page • References

  3. World Wide Web: How Efficient ? Difficult to find information! Stale/Missing links/web pages!! Time consuming! Sometimes special software required to view information! Irritating advertisements/banners

  4. Objective: Create an Online Dictionary and Thesaurus Using: HTML Perl & CGI Scripts MySql Database Apache Web Server

  5. Perl: In brief • Perl has Advanced Language Features • Highly portable • Higher level constructs than UNIX Shell scripts • More functionality than awk/sed • Strong support for pattern matching • Strong CGI support • Strong HTML parsing capability • Strong support for writing Web agents

  6. Apache: Advantages Apache web server is compiled with Processor-Specific Optimization to take advantage of the power of the new processor generation, giving it 5-30% more performance than any other Web Server. The main advantage of using the Apache web server is speed. Using the mod_perl module, Apache can return CGI requests on average 2-3 times faster than web servers that do not have mod_perl technology. It takes advantage of powerful API interface. Apache provides a robust and commercial grade reference implementation of the HTTP protocol. Its FREE !!

  7. MySQL: Advantages • MySQL is extremely good: • For logging. • When you open many connections; It connects very fast. • When SELECT and INSERT are used at the same time. • When updates are not combined with selects that take • a long time. • When most selects/updates use unique keys. • When many tables are used without long conflicting locks. • When you have big tables (MySQL uses a very compact table format).

  8. Database Schema

  9. Database Schema contd...

  10. Database Schema contd...

  11. Database Schema contd...

  12. WORDMEANING SITEREQ WORDID # MEANING1 MEANING2 MEANING3 : MEANING5 SITEID # SITEID # WORDSREQUESTED WORDSRETURNED WORDS WORDID # WORD WORDCONCEPTS WORDID # CONCEPT SITEID # CONCEPTDETAIL1 CONCEPTDETAIL2 : : : CONCEPTDETAIL9 Database Schema contd... WEBSITES SITEID # SITENAME Legends # - Foreign Key Red Fields - Primary Key Database Schema

  13. Some common PERL syntax used in the program... To connect to MySQL: $dbh = DBI->connect("DBI:mysql:$dbname", $user) or die "Can't connect: " . DBI->errstr; To store values in an ARRAY: push @siteids, $siteId; To process ARRAY elements: foreach $siteId (@siteids) { : : }

  14. Perl modules: The Approach • seachword.pl • dbInterface.pl • seachword.pl: Is the driving progam. • Once invoked, queries the database for • submitted word’s dictionary meaning or • thesaurus concepts, using routines from • dbInterface.pl.

  15. The Approach Contd … • Spawns user agents to fetch • meanings/concepts from WebSites. • Inserts meanings/concepts in the database. • Updates frequency stats. • Displays result in the browser. • Prints the search form in the Internet • browser to allow new searches.

  16. Search Form

  17. Check the meaning first in local database using: dbGetWordMeaning($dbh, $word) dbGetWordId($dbh, $word) dbGetSiteIdByFreq($dbh, $word) Subroutines: if (length $word != 0) { # First fetch the meaning from the database @meanings=&dbGetWordMeaning($dbh, $word); if ($#meanings < 0) { # Get the meaning from dictionary.com if (&parse_dictionary_com($word)) { # Fetch the meaning from the database @meanings=&dbGetWordMeaning($dbh, $word); }

  18. Subroutine contd... if ($#meanings < 0) { # Get the meaning from dictionary.com if (&parse_dictionary_com($word)) { # Fetch the meaning from the database @meanings=&dbGetWordMeaning($dbh, $word); } }

  19. Subroutine contd... if ($#meanings < 0) { # Get the meaning from dictionary.com if (&parse_dictionary_com($word)) { # Fetch the meaning from the database @meanings=&dbGetWordMeaning($dbh, $word); } } dbInsertWordMeaning($dbh, $siteId, $word, @meanings); dbUpdateSiteFreq($dbh, $siteId, 1); &dbUpdateSiteFreq($dbh, $siteId, 0); dbUpdateSiteFreq($dbh, $siteId, 0);

  20. The result page: Dictonary

  21. The result page: Thesaurus

  22. References • 1. Advanced PERL Programming by Sriram Srinivasan • 2. CGI Programming with PERL by Scott Guelich, Shishir Gundavaram and Gunther Birznieks • 3. The Complete HTML Reference by Thomas A. Powell • 4. PERL in Nutshell by Stephen Spainhour, Nathan Patwardhan • 5. Apache Web-Server by Lars Eilebrecht • 6. Apache Server Unleashed by Richard Bowen, Ken A. L. Coar, Rich Bowen, Patrik Grip-Jansson, Matthew Marlowe, Mohan Chinnapan • 7. http://www.apache.org • 8. http://addy.com/dc/html/writing_cgi_scripts.html • 9. http://www.cs.tcd.ie/research_groups/aig/iag/toplevel2.html • 10. http://www.mysql.com

  23. Questions !

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