I've written a couple of subclasses of DBI (after much hair-pulling frustration) -- so far, most everything works like I want it, with the exception of automatic disconnect handling... I'd like to put the disconnect method in a DESTROY, but none of my attempts are working. I tried putting the DESTROY method (calling $self->disconnect) in the specificdb::db class, but I get an error stating "DBI Handle has uncleared implementors data." (among other things... something to do with dbih_clearcom). Here's what I've got so far -- any advice on my approach would be most appreciated, especially if you can help get the automatic disconnect handling working.

package mydbi;
@ISA = qw( DBI );
use DBI;

sub connect {
    my( $proto, $dns, $username, $password ) = @_;
    my $class = ref( $proto ) || $proto;
    $class->init_rootclass;
    my $dbh = $class->SUPER::connect( $dns, $username, $password );
    $dbh;
}

package mydbi::db;
@ISA = qw( DBI::db );

sub select_value {
    my( $self, $st, $attr, @bind_values ) = @_;
    my $sth;
    if( ref $st ) { $sth = $st }
    else { $sth = $self->prepare( $st, $attr ) or return undef }
    $sth->execute( @bind_values ) or return undef;
    my $value = $sth->fetchrow_array;
}

package mydbi::st;
@ISA = qw( DBI::st );

1;


package specificdb;
use mydbi;
@ISA = qw( mydbi DBI );
use DBI;

sub new {
    my( $proto ) = shift;
    my $class = ref( $proto ) || $proto;
    my $dns = "DBI:mysql:database=XXX";
    my $username = "XXX";
    my $password = "XXX";
    my $self = $class->connect( $dns, $username, $password );
    $self;
}

package newbdb::db;
@ISA = qw( mydbi::db );

package newbdb::st;
@ISA = qw( mydbi::st );

1;
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