use strict;
use DBI;

##$SIG{__WARN__} = sub { die "warning why\n\n".shift(@_) };

{
    my $db_user      = 'null'; #read only
    my $db_pass      = 'nullnull';
    my $db_name      = 'null'; # the name of the db
    my $db_host      = 'localhost';
    my $db_driver    = 'mysql';
    my $db_serverstr = "DBI:$db_driver:$db_name";

    my $db_h = DBI->connect(
                "$db_serverstr",
                "$db_user",
                "$db_pass",
                { HandleError => sub { die "WHYYYY\n".shift(@_) }},
            );
}

__END__
DBI is 1.201
This is perl, v5.6.1 built for MSWin32-x86-multi-thread