Question

我有一个高分表，它似乎工作正常，除了随机时间的问题似乎是将某些用户重置为0，这是我的查询：

$user   = isset($_GET['username']) ? $_GET['username'] : "";
$time   = isset($_GET['time']) ? $_GET['time']  : "";
$videos  = isset($_GET['videos']) ? $_GET['videos'] : "";
$credits  = isset($_GET['credits']) ? $_GET['credits'] : "";


$user  = mysql_real_escape_string($user);
$time  = mysql_real_escape_string($time);
$videos = mysql_real_escape_string($videos);
    $credits = mysql_real_escape_string($credits);
    $secret = mysql_real_escape_string($secret);

// Main Query
$retval = mysql_query("
     INSERT INTO
     highscores(Username, Time, Videos, Credits)
     VALUES
     ('$user', '$time', '$videos', '$credits')
     ON DUPLICATE KEY UPDATE
     Time = '$time',
     Videos = '$videos',
     Credits = '$credits'
     ",
     $conn
     );

大部分时间它都会更新，有人能看出问题所在吗？

Answer 1

我想你想要更新积分而不是零。

假设您在执行查询之前将$ credit设置为0，而ON DUPLICATE KEY UPDATE部分将导致当前用户信用归零。相反，你应该做这样的事情：

<?php
$user = 109;
$time = time();
$videos = 'something';
$credits = 0;
$retval = mysql_query("INSERT INTO
                       highscores
                       (Username, Time, Videos, Credits)
                       VALUES
                       ('$user', '$time', '$videos', '$credits')
                       ON DUPLICATE KEY UPDATE
                       Time = '$time',
                       Videos = '$videos',
                       Credits = Credits + 1", $conn);

Answer 2

我认为你在寻找

$query = sprintf("INSERT INTO highscores(Username, Time, Videos, Credits)
    VALUES('%s', '%s', '%s', '%s') 
    ON DUPLICATE KEY UPDATE Time = Time + %2$s, Videos = Videos + %3$s, Credits = Credits + %4$s"     
    mysql_real_escape_string($user), // escape every variable you will be using in
    mysql_real_escape_string($time), // an SQL query to protect yourself against
    mysql_real_escape_string($videos), //  SQL injection or use parametriezed 
    mysql_real_escape_string($credits)); // queries with wrappers such as PDO or MySQLi

$retval = mysql_query($query,$conn);

如果用户已存在，则只会将新值添加到当前Credits，但不会更改其他任何内容。这对我来说似乎合乎逻辑。如果您还需要增加其他列，例如Videos，请执行与Credits相同的操作。

Answer 3

其他人指出导致此行为的原因。这是ON DUPLICATE UPDATE

的替代语法

// Main Query
$retval = mysql_query("
     INSERT INTO highscores
       (Username, Time, Videos, Credits)
     VALUES
       ('$user', '$time', '$videos', '$credits')
     ON DUPLICATE KEY UPDATE
       Time = Time + VALUES(Time),
       Videos = Videos + VALUES(Videos),
       Credits = Credits + VALUES(Credits)
     ",
     $conn
     );

MySQL UPDATE随机重置值？

3 个答案: