function buildquery($q) {
                $query = '';
                foreach ( $q as $qe ) {
                        if ( $qe['operator'] == 'string' ) {
                                $query.= 'strpos($row[\''.$qe['variable'].'\'],"'.$qe['value'].'") !== false';
                        } else {
                                $query.= '$row[\''.$qe['variable'].'\']'.$qe['operator'].$qe['value'];
                                //$query.= '$row[\''.$qe['variable'].'\']'.$qe['operator'].$qe['value'];
                        }
                        $query.= " and ";
                }
                $query = substr($query, 0, -5); // remove last " and "  
                return $query;
        }
        #Table 'mytable' fields are name, email, and site (table created in example1.php)
        include "csvdb.swishdb.com.php";

        $db = new LiteDB();
        $db->open("table") or die("cannot open table 'table'");

        #variable 'total' of object $db tells number of rows in table
        $q[1] = array('variable'=>'R1', 'operator'=>'>=', 'value'=>'0.01');
        $q[0] = array('variable'=>'R2', 'operator'=>'>=', 'value'=>'0.02');
        #$q[2] = array('variable'=>'Date', 'operator'=>'string', 'value'=>"2009-10");

        print_r($q);

        print_r(buildquery($q));
        echo "\n";
        
        $query = buildquery($q);        
//die();

        if($db->total >0) {
                for($i=1; $i<=$db->total; $i++) {
                        $row = $db->get_row($i);
        echo $query."\n";

                        #if ( $row['R1'] > 0.02 and $row['R2'] < 0.03 ) {
                        if ( 0 ) {

                                #echo "ROW.No.$i - Name : $row[name], Email : $row[email], Site : $row[site]<br>";
                                echo "ROW.No.$i - Date: $row[Date], R1 : $row[R1], R2 : $row[R2]";
                                echo "\n";

                        }
                }
        }