Mysql_fetch_row() expects parameter 1 to be resource, boolean given in

<?php
include("header.htm");
 
 
$dbhost = "localhost"; // Имя хоста БД
$dbusername = "admin"; // Пользователь БД
$dbpass = "admin"; // Пароль к базе
$dbname = "opros"; // Имя базы
 
$dbconnect = @mysql_connect ($dbhost, $dbusername, $dbpass); 
if (!$dbconnect) { echo ("Не могу подключиться к серверу базы данных!"); }
 
if(@mysql_select_db($dbname)) { echo "Подключение к базе $dbname установлено!"; }
else die ("Не могу подключиться к базе данных $dbname!");
 
 
$query =mysql_query("
SELECT prepods.id, prepods.fam, COUNT(result.id_otvet) AS c_otv, `otv1` AS otv 
FROM prepods INNER JOIN result ON (prepods.id = result.id_prepod)
WHERE (result.id_vopr BETWEEN 1 AND 4) AND (result.id_otvet = 1)
GROUP BY prepods.fam
union
SELECT prepods.id, prepods.fam, COUNT(result.id_otvet) AS c_otv, `otv2` AS otv
FROM prepods INNER JOIN result ON (prepods.id = result.id_prepod)
WHERE (result.id_vopr BETWEEN 1 AND 4) AND (result.id_otvet = 2)
GROUP BY prepods.fam
union
SELECT prepods.id, prepods.fam, COUNT(result.id_vopr) AS c_otv, `stud` AS otv
FROM prepods INNER JOIN result ON (prepods.id = result.id_prepod)
WHERE result.id_vopr=1
GROUP BY prepods.fam
union
SELECT prepods.id, prepods.fam, COUNT(result.id_otvet) AS c_otv, `otv3` AS otv
FROM prepods INNER JOIN result ON (prepods.id = result.id_prepod)
WHERE (result.id_vopr BETWEEN 5 AND 7) AND (result.id_otvet = 1)
GROUP BY prepods.fam
union
SELECT prepods.id, prepods.fam, COUNT(result.id_otvet) AS c_otv, `otv4` AS otv 
FROM prepods INNER JOIN result ON (prepods.id = result.id_prepod)
WHERE (result.id_vopr BETWEEN 5 AND 7) AND (result.id_otvet = 2)
GROUP BY prepods.fam");
$r = mysql_query($query);
while (list($arr,$key,$row,$cn,$vp,$vv,$i,$stud,$m1,$m2,$m3,$m4 = mysql_fetch_row($query,$dbconnect)))
{
    //echo '<pre>' . print_r($row,1) . '</pre>'; 
    $arr = $row['fam'];
    $key = $row['id'];
    $arr[$key]['name'] = $row['fam'];
    if ( $row['otv'] == 'otv1' ) { $arr[$key]['otr14'] = $row['c_otv']; }
    if ( $row['otv'] == 'otv2' ) { $arr[$key]['pol14'] = $row['c_otv']; }
    if ( $row['otv'] == 'stud' ) { $arr[$key]['stud'] = $row['c_otv']; }
    if ( $row['otv'] == 'stud2' ) { $arr[$key]['stud2'] = $row['c_otv']; }
    if ( $row['otv'] == 'stud3' ) { $arr[$key]['stud3'] = $row['c_otv']; }
    if ( $row['otv'] == 'stud4' ) { $arr[$key]['stud4'] = $row['c_otv']; }
    if ( $row['otv'] == 'stud5' ) { $arr[$key]['stud5'] = $row['c_otv']; }
    if ( $row['otv'] == 'stud6' ) { $arr[$key]['stud6'] = $row['c_otv']; }
    if ( $row['otv'] == 'stud7' ) { $arr[$key]['stud7'] = $row['c_otv']; }
    if ( $row['otv'] == 'otv3' ) { $arr[$key]['otr57'] = $row['c_otv']; }
    if ( $row['otv'] == 'otv4' ) { $arr[$key]['pol57'] = $row['c_otv']; }
}
 
echo "<table border=1><tr><td width=30>№№</td>
        <td width=30>id</td>
        <td width=150>Преподаватель</td>
        <td width=30>stud</td>
        <td width=30>m1</td>
        <td width=30>m2</td>
        <td width=30>Вп</td>
        <td width=30>m1</td>
        <td width=30>m2</td>
        <td width=30>Вв</td></tr>";
$i = 1; $cn = 0;
foreach ($arr as $key => $val) {
    $m1 = $m2 = $m3 = $m4 = $vp = $vv = $stud = 0;
    $m1 = (isset($arr[$key]['otr14'])) ? $arr[$key]['otr14'] : 0;
    $m2 = (isset($arr[$key]['pol14'])) ? $arr[$key]['pol14'] : 0;
    $m3 = (isset($arr[$key]['otr57'])) ? $arr[$key]['otr57'] : 0;
    $m4 = (isset($arr[$key]['pol57'])) ? $arr[$key]['pol57'] : 0;
    $stud = (isset($arr[$key]['stud'])) ? $arr[$key]['stud'] : 0;
  // echo '<pre>' . print_r($m3,1) . '</pre>'; 
    if ( $stud != 0 ) {
        $vp = round ( 100 * ( $m2 - $m1 ) / ( 4 * $stud ) );
        $vv = round ( 100 * ( $m4 - $m3 ) / ( 3 * $stud ) );
    }
    echo "<tr><td>$i</td>
        <td>$key</td>
        <td>";
    if ( $stud < 8 ) {
        echo '<font color=red>'.$arr[$key]['name'].'</font>';
        $cn++;
    } else {
        echo $arr[$key]['name'];
    }
    echo "</td>
        <td>$stud</td>
        <td>".($m1==''?'<font color=red>0</font>':$m1)."</td>
        <td>".($m2==''?'<font color=red>0</font>':$m2)."</td>
        <td>$vp</td>
        <td>".($m3==''?'<font color=red>0</font>':$m3)."</td>
        <td>".($m4==''?'<font color=red>0</font>':$m4)."</td>
        <td>$vv</td></tr>";
    $i++;
}
echo "</table><br />$cn";
mysql_close($dbconnect);
include("footer.htm");
?>

class db_driver {
 
    var $obj = array ( "dbname"   => "opros",
                       "dbuser"       => "admin",
                       "dbpasswd"       => "admin",
                       "dbhost"       => "localhost"
                     );
 
     var $q_id      = "";
     var $db_connect_id = "";
     var $query_count   = 0;
 
    function connect() { // коннект  с базой
    $this->db_connect_id = mysql_connect( $this->obj['dbhost'],$this->obj['dbuser'],$this->obj['dbpasswd'],$this->obj['dbname']);
        if ( !mysql_select_db($this->obj['dbname'], $this->db_connect_id) ) {
            echo ("ERROR: Cannot find database ".$this->obj['dbname']);
        }
    mysql_query("SET CHARACTER SET CP1251");
    }

if (!defined("IN_MKP")) {
    die ("Sorry !! You cannot access this file directly.");
}

<?php
require_once ("testpodkl.php");
$db = new database();
$db->connect();
$result = $db->query("SELECT time FROM result");
while ($row = $db->fetch_row($result)) {
 echo '<p> Time:'.$row['time'].'</p>';
 $dt = new DateTime();
 $dt->setTimestamp($row['time']);
 echo $dt->format ("Y-m-d H:i:s");
 }
?>