Fetch type id based on name

my $filter_type_name = "html__sr_pr";
   # we need to fetch the html type id from Document Type
    my $dt = new DocumentType($self->{LOG},
    $self->{DB_CONNECTION},
    undef, $filter_type_name);
    my $htmltype =  $dt-> fetch_document_type_id_by_name($filter_type_name);