No, the difference here is that you make this call $dbh->connect_cached() so that instead of just storing your object - you revivify it automatically as needed. I think of this as important for something that will be long running - I'd just go with a plain stored value otherwise.

sub main::dbh
{
    # for daemons and long running code - reconnect as needed
    DBI->connect_cached( ... )
}

sub main::dbh
{
    # initialize the connection or re-use.
    $::DBH ||= DBI->connect( ... )
}

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In reply to Re^5: Does there exist a CPAN module for lazily initialized variables? by diotalevi
in thread Does there exist a CPAN module for lazily initialized variables? by jryan

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