#!/usr/bin/perl -w

# mercurus' counter script
# version 0.9
# 21 April 2003

# Documentation to follow...
# Before configuring this file, please run: ./configure.pl to establish the required mySQL table.

# Modules.

use strict;
use CGI;
use DBI;
use CGI::Carp qw(fatalsToBrowser); # Added for debugging purposes.

# Variables.

my $db_database = "**********"; # The name of the mySQL database.
my $db_username = "**********"; # The name of the mySQL user.
my $db_password = "**********"; # The password for the mySQL user.

# Main script.

## Connect to the mySQL database.
my $dbh = &mysql_connect ($db_database,$db_username,$db_password);

## Print the current database value.
my $current_count = &print_current ($dbh);

## Increment the database value.
my $exit_code = &increment ($dbh,$current_count);

## Exit.
if ($exit_code == 0) { exit; }
else { die "Unknown error. Execution failed, but database updated.\n"; }

# Subroutines.

## Current database value printing subroutine.
sub print_current {

my $dbh = (@_);

## Retrieve information from the database.
my $sth_1 = $dbh->prepare ("SELECT count FROM counter;");
   $sth_1->execute || die "$dbh->errstr()";
while (my $fields = $sth_1->fetchrow_arrayref()) {
my $current = $fields->[0];
}

## Display that information for the user.
print "Content-type: text/html\n\n";
print "$current others have gathered information here.\n";

return ($current);
}

## Current database value incrementing subroutine.
sub increment {

my ($dbh,$current) = (@_);

## Increment the previous value.
my $updated = $current + 1;

## Write the new value to the database.
my $sth_2 = $dbh->prepare ("UPDATE counter SET count='$updated' WHERE count='$current';");
   $sth_2->execute || die "$dbh->errstr()";

return ($exit_code);
}

## MySQL database connecting subroutine.
sub mysql_connect {

my ($db_name,$username,$password) = (@_);

## Connect to the database with the values supplied.
my $dbh = DBI->connect("DBI:mysql:$db_name","$username","$password");

return ($dbh);
}

# End of file.