php - PHP 数据库 ID 列中的最后一个条目(主键)

Question

如何获取 ID 列中的最大数字？

使用 MySQL，我已经完成了连接部分，我只需要知道如何使用 PHP 显示该数字。我从 friend 那里得到了一些代码:

    <?php
    $con = mysql_connect("quollcraft.net", "quollcr1_forum", "pw");
    if (!$con) {
    die('Could not connect: ' . mysql_error());
    }
    mysql_select_db("quollcr1_hub", $con);

    $result = mysql_query("SELECT * FROM recentplayers ORDER BY id DESC LIMIT 28");

    echo "<table>";
    while ($row = mysql_fetch_array($result)) 
        echo "<td>";
        echo "<center>";
        echo '<img class="avatar" src="http://cravatar.eu/avatar/' . $row ['name'] .         '/40.png" rel="tooltip" style="display: inline-block" title="' . $row ['name'] . '">';

        echo "</td>";
    echo "</table>";    




    mysql_close($con);
    ?>
    <?php
    $con = mysql_connect("quollcraft.net", "quollcr1_forum", "pw");
    if (!$con) {
        die('Could not connect: ' . mysql_error());
    }
    mysql_select_db("quollcr1_hub", $con);

    $result = mysql_query("SELECT * FROM id ORDER BY id DESC LIMIT 1");
    echo "<table>";
    while ($row = mysql_fetch_array($result)) 
        echo "<td>";
        echo "<center>";

        echo "<p>' . $row ['id'] . 'hello</p>";
        echo "</td>";
    echo "</table>";    




    mysql_close($con);
    ?>`

它应该显示我最新的玩家，然后显示我拥有的玩家总数。

Answer 1

您可以使用聚合函数MAX()来查找列中的最大值:

SELECT MAX(ID) as ID
FROM TableName