use DBI;

print "Content-type:text/html\n\n";

$dbh = DBI->connect("dbi:mysql:database=; host=; user=; password=")
    or die "Connecting to MySQL database failed: $DBI::errstr";
#Removed database,host,user and password details obviously

$sSQL = "SELECT FirstName, LastName FROM Users";
$st = $dbh->prepare($sSQL)
    or die "Preparing MySQL query failed: $DBI::errstr
";
$st->execute()
    or die "The execution of the MySQL query failed: $DBI::errstr";
while ($row = $st->fetchrow_hashref())
{
    print " $row->{FirstName} $row->{LastName}";
}
$dbh ->disconnect();