從其他表添加數據到其他表

Question

我試圖從其他表從其他表中添加一列while循環的循環，我想這樣的事情，但似乎並不工作。我怎樣才能實現這樣的事情？據我所知，我需要將data_auth中的變量保存在數組中，但我如何使用循環來回顯它們？

$SQL = mysql_query("SELECT * FROM users ORDER BY data_reg DESC LIMIT $offset, $rowsperpage"); 
while($rand = mysql_fetch_assoc($SQL)){ 
     $id = $rand['id'];    
     $user= $rand['user']; 

     $SQL2 = mysql_query("SELECT data_auth FROM access_log WHERE user = '$user'"); 
     while($rand = mysql_fetch_assoc($SQL2)){ 
      $data_auth = $rand['data_auth']; 
     } 

     ?> 
     <li><?php echo "$user"; ?></li> 
     <li><?php echo "$data_auth"; ?></li> 
     <?php 
     } 
     ?> 

Answer 1

據我所知 - 你只是想在與用戶相關的列中顯示所有data_auth值的列表。最簡單的方法是：

$SQL = mysql_query("SELECT * FROM users ORDER BY data_reg DESC LIMIT $offset, $rowsperpage"); 
while($rand = mysql_fetch_assoc($SQL)){ 
     $id = $rand['id'];    
     $user= $rand['user']; 

     $SQL2 = mysql_query("SELECT data_auth FROM access_log WHERE user = '$user'"); 

     ?> 
     <li><?php echo "$user"; ?></li> 
     <li><?php   
       while($rand2 = mysql_fetch_assoc($SQL2)){ 
         echo $rand2['data_auth'] . '<br/>'; 
      } 
      ?> 
     </li> 
     <?php 
     } 
     ?> 

此外，您使用第二while相同的變量名是不是安全的。

或用臨時數組：

$SQL = mysql_query("SELECT * FROM users ORDER BY data_reg DESC LIMIT $offset, $rowsperpage"); 
while($rand = mysql_fetch_assoc($SQL)){ 
     $id = $rand['id'];    
     $user= $rand['user']; 

     $SQL2 = mysql_query("SELECT data_auth FROM access_log WHERE user = '$user'"); 
     $data_auth = array(); 
     while($rand2 = mysql_fetch_assoc($SQL2)){ 
         $data_auth[] = $rand2['data_auth']; 
      } 
     ?> 
     <li><?php echo "$user"; ?></li> 
     <li><?php foreach($data_auth as $da){ 
      echo $da . "<br/>"; 
      } 
      ?> 
     </li> 
     <?php 
     } 
     ?> 

Answer 2

的data_auth變量不能在其他打印while循環它不是由MySQL的獲取，因此你有一個錯字：

<li><?php echo "data_auth"; ?></li> 

Answer 3

你可以只使用一個SQL查詢，像這樣：

//$SQL = mysql_query("SELECT users.*,access_log.data_auth FROM users,access_log WHERE users.user = access_log.user ORDER BY data_reg DESC LIMIT $offset, $rowsperpage"); 
//SQL with JOIN syntax 
$SQL = mysql_query("SELECT users.*,access_log.data_auth FROM users INNER JOIN access_log ON users.user = access_log.user ORDER BY data_reg DESC LIMIT $offset, $rowsperpage"); 
while($rand = mysql_fetch_assoc($SQL)){ 
     $id = $rand['id'];    
     $user= $rand['user']; 
     $auth = $rand['data_auth']; 
     ?> 
     <li><?php echo $user; ?></li> 
     <li><?php echo $auth; ?></li> 
<?php 
} 
?>