没有结果返回elseif PHP查询

Question

我有一个'状态'列的数据库，要么读'积极'或'非活动'。

我想根据状态是“活动”还是“非活动”返回不同的文本，并且我正在使用if...和elseif...。

如果状态为“有效”，则消息显示完美。这也会提示数据库将状态字段更新为“非活动状态” - 同样，这也是完美的。

但是，如果我重新加载页面，使用我知道状态为'inactive'的键，则不显示任何内容。

<?php 

if (isset($_GET['key'])) { 
    $key = $_GET['key']; 

    include("db.php"); 

    $download_query="SELECT * FROM sales WHERE key='$key'"; 
    $download_result=@mysql_query($download_query); 
    $download_row=@mysql_fetch_array($download_result, MYSQL_ASSOC); 
    $productid=$download_row['productid']; 
    $datecreated=$download_row['datecreated']; 
    $dateaccessed=$download_row['dateaccessed']; 
    $status=$download_row['status']; 

    if ($status=="active") { 
     $download_updatestatus_query="UPDATE `sales` SET `status`='inactive' WHERE `key`='$key'"; 
     $download_updatestatus_result=@mysql_query($download_updatestatus_query) or die (mysql_error()); 
     echo "Go ahead and download file."; 
    } 
    else if ($status=="inactive") { 
     echo "You may have downloaded this before."; 
    } 
} 
else { 
    echo "Sorry, no key provided."; 
} 

?> 

Answer 1

您在elseif后有额外的}。尝试：

else if ($status=="inactive") { 
echo "You may have downloaded this before."; 
} 

else { 

Answer 2

你想确保mysql_query是不假，包含运行mysql_num_rows一些结果，你开始获取数据之前。

同时将$_GET的值传递给MySQL Query未经验证是非常糟糕的想法。

if (isset($_GET['key'])) 
{ 
    //You have to make sure that provided value is safe to use in mysql query 
    $key = mysql_real_escape_string($_GET['key']); 

    include("db.php"); 

    $download_query = "SELECT * FROM sales WHERE key='$key'"; 

    $download_result = mysql_query($download_query); 

    // Check result 
    if (!$download_result) 
     die('Invalid query: ' . mysql_error()); 

    if($download_result && mysql_num_rows($download_result) > 0) 
    { 
     $download_row = mysql_fetch_assoc($download_result); 
     $productid = $download_row['productid']; 
     $datecreated = $download_row['datecreated']; 
     $dateaccessed = $download_row['dateaccessed']; 
     $status = $download_row['status']; 

     if ($status == "active") 
     { 
      $download_updatestatus_query = "UPDATE `sales` SET `status`='inactive' WHERE `key`='$key'"; 

      $download_updatestatus_result = mysql_query($download_updatestatus_query) or die (mysql_error()); 

      echo "Go ahead and download file."; 
     } 
     else if ($status == "inactive") 
     { 
      echo "You may have downloaded this before."; 
     } 
    } 
    else 
    { 
     echo 'No results found'; 
    } 
} 
else 
{ 
    echo "Sorry, no key provided."; 
}