php - 无法检索每条记录的额外查询的值？

Question

我正在处理一个表，将从数据库中选取用户的数据。

问题是我无法在 while 条件上放置两个语句，因为我从不同的表和行获取数据。

@代码

<?php
$con = mysql_connect("localhost", "username", "password") or die(mysql_error());
mysql_select_db("database_name") or die(mysql_error());

$result = mysql_query("select * FROM users");

$space_used = mysql_query("SELECT SUM(fileSize) FROM file WHERE file.userId=users.id AND file.statusId=1");

$total_files = mysql_query("SELECT COUNT(id) FROM file WHERE file.userId=users.id AND file.statusId=1");

echo "<table class='table table-striped table-hover table-bordered' id='sample_editable_1'>
<tr>
    <th>Username</th>
    <th>Type</th>                                   
    <th>Email</th>
    <th>Last Login</th>
    <th>Last IP</th>
    <th>space_used</th>
    <th>total_files</th>
    <th>status</th>
</tr>";

while($row = mysql_fetch_array($result))
{
    echo "<tr>";
        echo "<td>" . $row['username'] . "</td>";
        echo "<td>" . $row['level'] . "</td>";
        echo "<td>" . $row['email'] . "</td>";
        echo "<td>" . $row['lastlogindate'] . "</td>";
        echo "<td>" . $row['lastloginip'] . "</td>";
        echo "<td>" . $space_used['space_used'] . "</td>";
        echo "<td>" . $total_files['total_files'] . "</td>";
        echo "<td>" . $row['status'] . "</td>";
    echo "</tr>";
}

echo "</table>";
mysql_close($con);
?>

我得到的是用户名、级别、电子邮件、laSTLogindate、laSTLoginip 和状态的所有值。我的表格上没有显示的两个是我要实现的第二个条件:space_used 和total_files。

我做错了什么？我不是 php 专家，事实上，我混合了教程和脚本来达到这个结果，这有点复杂。

谢谢

Answer 1

您需要重新处理您的查询，您可以使用 JOIN 将 3 个查询恢复为单个查询:

  SELECT u.*, 
         SUM(f.fileSize) AS space_used, 
         COUNT(f.id) AS total_files
    FROM users u
    JOIN file f 
      ON f.userId = u.id AND f.statusId = 1
GROUP BY u.id

然后你可以这样阅读:

<?php
// your database info
$db_host = 'your MySQL server host';
$db_user = 'your username';
$db_pass = 'your password';
$db_name = 'your database name';
$con = new mysqli($db_host, $db_user, $db_pass, $db_name);
if($con->connect_error)
{
        die('Connect Error (' . mysqli_connect_errno() . ') '. mysqli_connect_error());
}

if (!$result = $con->query("SELECT u.*,
                                   SUM(f.fileSize) AS space_used, 
                                   COUNT(f.id) AS total_files
                              FROM users u
                              JOIN file f 
                                ON f.userId = u.id AND f.statusId = 1
                          GROUP BY u.id"))
{
    die('Select query error: ' . $con->error);
}
?>
<table class='table table-striped table-hover table-bordered' id='sample_editable_1'>
    <tr>
        <th>Username</th>
        <th>Type</th>                                   
        <th>Email</th>
        <th>Last Login</th>
        <th>Last IP</th>
        <th>space_used</th>
        <th>total_files</th>
        <th>status</th>
    </tr>
<?php
while ($row = $result->fetch_array())
{
?>
    <tr>
        <td><?php echo $row['username']; ?></td>
        <td><?php echo $row['level']; ?></td>
        <td><?php echo $row['email']; ?></td>
        <td><?php echo $row['lastlogindate']; ?></td>
        <td><?php echo $row['lastloginip']; ?></td>
        <td><?php echo $row['space_used']; ?></td>
        <td><?php echo $row['total_files']; ?></td>
        <td><?php echo $row['status']; ?></td>
    </tr>
<?php
}
$con->close();
?>
</table>