警告:mysql_num_rows():提供的参数不是有效的MySQL结果资源

Question

可能重复:
警告:mysql_fetch_array():提供的参数不是有效的MySQL结果

我在下面的代码(在查询的末尾)收到以下错误消息:

警告:mysql_num_rows():提供的参数不是第28行的../view-ind-order.php中的有效MySQL结果资源

该脚本应该检索订单(从列出订单表中所有order_id行的页面),订单内容,订购用户和产品信息.我想我在哪里得到的错误是订单中有多个产品,但我不能确定我哪里出错了.(标题有会话启动命令)

     <?php 
      $page_title = 'Order';
      include ('./includes/header.html');

      if ( (isset($_GET['id'])) && (is_numeric($_GET['id'])) )
      {    
       $id = $_GET['id'];
       } elseif ( (isset($_POST['id'])) && (is_numeric($_POST['id'])) )
       {    
       $id = $_POST['id'];
       } else { 
       echo 'This page has been accessed in error';
       include ('./includes/header.html'); 
       exit();
      }

 require_once ('mydatabase.php'); 

 $query = "SELECT us.users_id, us.users_first_name, us.users_surname, us.users_business, 
             ord.order_id, ord.users_id, ord.total, ord.order_date,  
             oc.oc_id, oc.order_id, oc.products_id, oc.quantity, oc.price
             prd.products_id, prd.products_name, prd.price      
         FROM users AS us, orders AS ord, order_contents AS oc, products AS prd  
         WHERE ord.order_id=$id
         AND us.users_id = ord.users_id
         AND ord.order_id = oc.order_id
         AND oc.products_id = prd.products_id    
         ";

 $result = @mysql_query ($query); 

 if (mysql_num_rows($result) == 1) { 

    $row = mysql_fetch_array ($result, MYSQL_NUM);

    echo '
    <table>
    <tr>
    <td><strong>Name:</strong></td>
    <td>' . $row[1] . ' ' . $row[2] . '</td>
    </tr>
    <tr>
    <td><strong>Business Name</strong></td>
    <td>' . $row[4] . '</td>
    </tr>   
    <tr>
    <td><strong>Total:</strong></td>
    <td>' . $row[7] . '</td>
    </tr>
    <tr>
    <td><strong>Quantity</strong></td>
    <td>' . $row[12] . '</td>
    </tr>
    <tr>
    <td><strong>Product:</strong></td>
    <td>' . $row[15] . '</td>
    </tr>   
    <tr>
    <td><strong>Price:</strong></td>
    <td>' . $row[13] . '</td>
    </tr>
    </table>
    ';

} else { 
    echo '<h1 id="mainhead">Page Error</h1>
    <p class="error">This page has been accessed in error.</p><p><br /><br /></p>';   
}
mysql_close();

include ('./includes/footer.html');
?>

Answer 1

更改 $result = @mysql_query ($query);

同

$result = mysql_query ($query) or die(mysql_error());

看看你是否有任何错误.

编辑:

您在oc.price之后和prd.products_id之前错过了逗号.像这样更改您的查询:

$query = "SELECT us.users_id, us.users_first_name, us.users_surname, us.users_business, 
             ord.order_id, ord.users_id, ord.total, ord.order_date,  
             oc.oc_id, oc.order_id, oc.products_id, oc.quantity, oc.price/*here*/,/**/
             prd.products_id, prd.products_name, prd.price      
         FROM users AS us, orders AS ord, order_contents AS oc, products AS prd  
         WHERE ord.order_id=$id
         AND us.users_id = ord.users_id
         AND ord.order_id = oc.order_id
         AND oc.products_id = prd.products_id    
         ";