Java, JDBC, Perl, CGI Embedded SQLWhat will we cover ?How to run a query ?Modern 3-tier architectureApplication ?Why do we need applications ?Back to Assignment 4JDBC/ODBCKey CodeHTML/CGIFORMSPerlSlide 13Key Code (2)User InputMiscellaneousJava, JDBC, Perl, CGIEmbedded SQLNovember 3rd, 2000What will we cover ?•Assignment 4 – Java and JDBC•Course project – HTML, PERL, CGI, Embedded SQL in PerlHow to run a query ?•Running a query:–Query Analyzer (assignment 3)–Any application (assignment 4)–Web application (project)Modern 3-tier architecture•Web server, application, databaseDatabase ServerApplicationWeb ServerInternetFORMSODBCCGIApplication ?•What is it ?–Software that formally separates and coordinates:•Data sitting in the database•Application logic•Web accesses•What it does ?–Connects either a web server or users to the database.Why do we need applications ?•Easier to develop and maintain•We can reuse components for and application services:–Caching, encryption, managing database connections•Multiple databases•SecurityBack to Assignment 4•This is NOT a programming course.•Tutorial on the web – straightforward•Steps:1. Add an ODBC connection on your machine2. Create a new Java Application (Console Application)3. Download the example code providedJDBC/ODBC•Standardized network database APIs –Connect, submit queries, process results, disconnect –Abstract application from particular database •ODBC from Microsoft, JDBC from Sun •A good driver can make a huge difference –Pre-fetching –Data caching –SQL translation caching •Could spend hours talking about JDBC/ODBCKey CodeClass.forName("com.ms.jdbc.odbc.JdbcOdbcDriver");java.sql.Connection c = DriverManager.getConnection ("jdbc:odbc:444","cse444","WeRock!");java.sql.Statement s= c.createStatement();java.sql.ResultSet rs;rs = s.executeQuery("Select * from movies");java.sql.ResultSetMetaData md = rs.getMetaData();while (rs.next()){ area.append("\nTUPLE: |"); for (int i = 1; i <= md.getColumnCount();i++){ area.append(rs.getString(i) + " | "); }}•XML ?HTML/CGI•How does the Web works ?–Send a request to a server (cubist)–Servers answers back with HTML text–Browser parses text and outputs the page•What if the request involves running an application on the server ?–Client must have a FORM in the HTML file–FORM indicates what action the server must takeFORMS<form ACTION="http://cubist.cs.washington.edu/ ~tzoompy/444_2.pl" method=POST><P>Input a last name (try 'Gore'): <INPUT NAME=last_name></P><P><INPUT TYPE=SUBMIT></p></form>Perl•Very successful and popular•Easy for managing data (files or streams)•Also popular for using as the CGI language of choice•Examples:–print “Hello World !\n”;–while, for, if, very standard….–$lname =~ tr/a-z/A-Z/;–$lname =~ s/Levy/Halevy/;Key Code#!/usr/bin/perl5 -wuse CGI;use DBI;$html = new CGI;print $html->header, "\n", $html->start_html();&searchDatabase;print $html->end_html;exit(0);Key Code (2)sub searchDatabase { $sql = "SELECT * FROM Elections2000"; $db = DBI->connect("dbi:Sybase:server=ISQL01", "cse444", "WeRock!"); $db or die "Sorry we couldn't connect!\n"; $sth = $db->prepare($sql); $sth->execute(); while ($row = $sth->fetchrow_hashref()) { $rec1 = $row->{lname}; print "Record = $rec1<p>"; }}User Input•Check the tutorial and examples available on the web•Once all this is done you are 75% done with project•More help ?–Google (or your favorite engine)–Java ? – I don’t know–Perl ? – Lama and Camel books (O’Reilly)–HTML/CGI ? – Anything, it’s easy anywayMiscellaneous•Assignment 4:–output – stdout preferred, but anything reasonable–queries – do your own or get solutions–two programs only –code must be reasonable documented•Project–black-box testing (including stress test)–why not Java servlets/ASP/Java/Assembly…•cse security policy,
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