将另一个表中的数据添加到另一个表的循环中

时间:2012-10-01 21:55:59

标签: php mysql

我试图将另一个表中的列添加到来自另一个表的while循环中,我尝试了类似这样的东西,但似乎没有用。我怎样才能实现这样的目标?据我所知,我需要保存数组中data_auth的变量,但如何用循环回显它们呢?

$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  
      }
      ?>

3 个答案:

答案 0 :(得分:3)

您可以使用ONE sql查询,如下所示:

//$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  
 }
 ?>

答案 1 :(得分:2)

据我了解 - 您只想在与用户相关的列中显示所有data_auth值的列表。最简单的方法是:

$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,在第二个while中使用相同的变量名称是不安全的。

或者使用临时数组:

$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  
      }
      ?>

答案 2 :(得分:0)

data_auth变量无法打印在另一个while循环中,而mysql没有获取它,因此你输错了:

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