沒有結果返回elseif PHP查詢

Question

我有一個'狀態'列的數據庫，要麼讀'積極'或'非活動'。

我想根據狀態是「活動」還是「非活動」返回不同的文本，並且我正在使用if...和elseif...。

如果狀態爲「有效」，則消息顯示完美。這也會提示數據庫將狀態字段更新爲「非活動狀態」 - 同樣，這也是完美的。

但是，如果我重新加載頁面，使用我知道狀態爲'inactive'的鍵，則不顯示任何內容。

<?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後有額外的}。嘗試：

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

else { 

Answer 2

你想確保mysql_query是不假，包含運行mysql_num_rows一些結果，你開始獲取數據之前。

同時將$_GET的值傳遞給MySQL Query未經驗證是非常糟糕的想法。

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."; 
}