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   My::User->set_sql(
      'getUsers', 'select * from users', 'Main'
   );

   my $sth = My::User->sql_getUsers;
   $sth->execute();
   # etc

    $sth->execute([qw/value1 value2/], [\my $res1]);
    my %hash = $sth->fetch_hash;

package User;
use base 'Class::DBI';

...
User->columns('All', qw/id name password/);
User->coumns('Primary', 'id');
User->set_db('Main', 'dbi:mysql', 'gav', 'perlmonks');

    my $user1 = User->new({ name => 'gav', password => 'monk' });
    my $user2 = User->retrieve(1023);
    printf "Id: %d, Name: %s, Pass %s\n", $user2->id, $user2->name, 
        $user2->password;

    my $user = User->search(name => 'gav');
    if ($user && ($user = $user->next) && $user->password eq 'monk') {
        print "Welcome gav^!\n";
    } else {
        print "Schoo!\n";
    }