PHP PDO SQL錯誤：帶有消息'SQLSTATE [HY093]的未捕獲異常'PDOException'：無效的參數編號

Question

我看不出這個sql中有什麼問題。 沒有Haversine公式的最簡單的sql工作得很完美。所以我的意思是應該是關於sql或statments的東西。我看不到它。 有些想法？ 謝謝，

<?php 
require_once "connectPDO.php"; 

// Get parameters from URL 
$lat = 55; //$_GET["lat"]; 
$lng = 3; //$_GET["lng"]; 
$radius = 18; //$_GET["radius"]; 

// Start XML file, create parent node 
$dom = new DOMDocument("1.0"); 
$node = $dom->createElement("markers"); 
$parnode = $dom->appendChild($node); 

//$query = $db->prepare("SELECT id, coursename, lat, lng FROM wp_courses"); 
$query = $db->prepare("SELECT coursename, lat, lng, 
(3959 * acos(cos(radians(:latitude)) * cos(radians(lat)) 
* cos(radians(lng) - radians(:longitude)) + sin(radians(:latitude)) 
* sin(radians(lat)))) AS distance FROM wp_courses 
HAVING distance < :radius ORDER BY distance LIMIT 0 , 20"); 
$query->bindParam(':latitude', $lat, PDO::PARAM_STR); 
$query->bindParam(':longitude', $lng, PDO::PARAM_STR); 
$query->bindParam(':radius', $radius, PDO::PARAM_STR); 
$query->execute(); 

header("Content-type: text/xml"); 
foreach ($query->fetchAll(PDO::FETCH_ASSOC) as $row) { 
    $node = $dom->createElement("marker"); 
    $newnode = $parnode->appendChild($node); 
    $newnode->setAttribute("name", $row['coursename']); 
    $newnode->setAttribute("lat", $row['lat']); 
    $newnode->setAttribute("lng", $row['lng']); 
    $newnode->setAttribute("distance", $row['distance']); 
} 
echo $dom->saveXML(); 
?> 

Answer 1

你不能在查詢中重複使用相同的參數名稱，但它是簡單的只是改變他們有點像這樣

$query = $db->prepare("SELECT coursename, lat, lng, 
(3959 * acos(cos(radians(:latitude1)) * cos(radians(lat)) 
* cos(radians(lng) - radians(:longitude)) + sin(radians(:latitude2)) 
* sin(radians(lat)))) AS distance 
FROM wp_courses 
HAVING distance < :radius ORDER BY distance LIMIT 0 , 20"); 

$query->bindParam(':latitude1', $lat, PDO::PARAM_STR); 
$query->bindParam(':latitude2', $lat, PDO::PARAM_STR); 
$query->bindParam(':longitude', $lng, PDO::PARAM_STR); 
$query->bindParam(':radius', $radius, PDO::PARAM_STR); 
$query->execute();