SQL in perl on the Web

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In order to create database backed website you need each of the following:

  • a web server,
  • a scripting language,
  • a database.

The following is based on Windows / Apache /Perl / MySQL

  • Install Perl.
  • Use ppm to install the MySQL module. From the Command Prompt
C:\>c:\perl\bin\ppm
PPM>install DBD-Mysql
PPM>exit
C:\>exit
  • Install Apache
  • Start your Apache server: C:\Program Files\Apache Group\Apache\Apache.exe or C:\Program Files\Apache Group\Apache2\bin\Apache.exe
  • Create a file called C:\Program Files\Apache Group\Apache\cgi-bin\cia.htm the text of the program is shown below
  • The given program connects to a MySQL server running at Napier University
  • Admire your work: Visit http://localhost/cgi-bin/cia.htm


#!C:/perl/bin/perl
use CGI qw(:standard);
use Mysql;
 
print header();
 
#Import the CGI parameters into the $Q structure
import_names();
 
#Connect to Andrew's MySQL server at Napier University
my $dbh = DBI->connect("dbi:mysql:database=gisq;host=pc236nt.napier.ac.uk;port=3306",
                       "scott", "tiger");
 
my $sth = $dbh->prepare("SELECT DISTINCT region FROM cia");
$sth->execute;
print "<h1>Here are some regions</h1>\n";
while (my ($region) = $sth->fetchrow_array()){
  print "<a href='?region=$region'>$region<a><br/>\n";
}
 
if ($Q::region) {
  print "<h1>Here are the countries of $Q::region</h1>";
  my $sth = $dbh->prepare("SELECT name, population FROM cia where region=?");
  $sth->execute($Q::region);
  while (my ($name,$pop) = $sth->fetchrow_array()){
    print "$name $pop<br/>\n";
  }
}
 
$dbh->disconnect;


This is what it should look like

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