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#!/usr/bin/perl
use GD;
use DBI; # Load Database Interface Module
use Data::Dumper;
# Connect to database
my $dbh = DBI->connect
('DBI:mysql:database=test;host=localhost:mysql_server_prepare=1',
'myUser', 'myPassword', {RaiseError => 1})
or die "$0: Can not connect to database: " . $DBI::errstr;
# create a new image
$im = new GD::Image(6490,4000);
# allocate color black
$black = $im->colorAllocate(0,0,0);
# The maximum id value in table is 25958999
my $sth = $dbh->prepare("SELECT id FROM myTable WHERE id=?");
my $id = 1;
foreach $x (0..6489) {
print "x=$x/6490 id=$id\n";
foreach $y (0..3999){
$sth->execute($id);
if ($sth->fetchrow_array) {
$im->setPixel($x,$y,$black);
}
$id = $id + 1;
}
open(OUT,">/tmp/id.png") or die "can not write output file";
binmode OUT;
print OUT $im->png;
close(OUT);
}