my %attr = ( RaiseError => 1);  #auto die with error printout
my $dbh = DBI->connect("dbi:SQLite:dbname=$dbfilename","","",\%attr)
    or die "Couldn't connect to database $dbfilename: " . DBI->errstr;
    
my $get_qsos = $dbh->prepare ("SELECT * FROM raw_qsos 
                               WHERE 
                               rcv_call = ?");
$get_qsos->execute($call);
my $resultRef = $get_qsos->fetchall_arrayref;
        
my $n_dbQso = scalar(@$resultRef);   #number of rows with that call