porting DBI to Apache::DBI

[James Array]

Haloo

          I'm confusing of how to port DBI CGI to Apache::DBI mod_perl with 
Apache::Registry
for the most efficient:

if my normal DBI CGI is:

use strict;
use DBI;

my $dbh=DBI->connect("database","login","password","mysql");
......
$dbh->disconnect;

=========================================================

when port to Apache::DBI should I modify it as
1:

use strict;
use DBI;
use vars qw($dbh);

$dbh=DBI->connect("database","login","password","mysql");
........
$dbh->disconnect;

===========================================================

or
2:

use strict;
use DBI;
use vars qw($dbh);

$dbh ||=DBI->connect("database","login","password","mysql");
.....
$dbh->disconnect;

============================================================

or
3:

need not to change any thing?
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