PHP OpenCart 2.1.0.1 MySQL ошибка запроса

public function export () {

    $output = "";

$table = "app_feedback"; // Enter Your Table Name$query = "SELECT ap.*,sr.name as ShowRoomName,CONCAT_WS(' ', sr.address1, sr.address2,sa.showroom_area_name,sc.showroom_city_name,ss.showroom_state_name,'-',sr.pincode) AS ShowroomAddress FROM ".DB_PREFIX."app_feedback ap LEFT JOIN " . DB_PREFIX . "showroom sr ON (ap.showroom = sr.showroom_id) LEFT JOIN " . DB_PREFIX . "showroom_area sa ON (sr.showroom_area_id = sa.showroom_area_id) LEFT JOIN " . DB_PREFIX . "showroom_city sc ON (sr.showroom_city_id = sc.showroom_city_id) LEFT JOIN " . DB_PREFIX . "showroom_state ss ON (sr.showroom_state_id = ss.showroom_state_id)";

if(!empty($this->request->get['date_from'])&&!empty($this->request->get['date_to'])){

$date_from = $this->request->get['date_from'];

$date_to = $this->request->get['date_to'];

$time_from = $this->request->get['time_from'];

if(empty($time_from)){

$time_from = '00:00';

}

$time_to = $this->request->get['time_to'];

if(empty($time_to)){

$time_to = '23:59';

}

//      $query .=" WHERE DATE(date)>= '".$date_from."' AND DATE(date)<='".$date_to."'";

$query .=" WHERE date BETWEEN '".$date_from. ' '.$time_from.":00' AND '".$date_to.' '.$time_to.":00'";

}

$sql = mysql_query($query);

$columns_total = mysql_num_fields($sql);

// Get The Field Name

for ($i = 0; $i < $columns_total; $i++) {

$heading = mysql_field_name($sql, $i);

if($heading!='showroom')

{

$output .= '"'.$heading.'",';

}

//  $output .= '"'.$heading.'",';

}
$output .="\r\n";
// Get Records from the table
while ($row = mysql_fetch_array($sql)) {

for ($i = 0; $i < $columns_total; $i++) {

//  $output .='"'.$row["$i"].'",';

if($i!=16){

$values=str_replace('amp;', "", $row["$i"]);

$output .='"'.$values.'",';

}

}

$output .="\r\n";

}

// Download the file$filename = "feedback.csv";

header('Content-type: application/csv');

header('Content-Disposition: attachment; filename='.$filename);

echo $output;

}