php计数器增量错误

时间:2012-01-04 10:39:47

标签: php mysql

因为我每次用户点击图片时都试图将计数器增加到加1。我写了下面的代码但它说了一些错误“警告:mysql_fetch_array()期望参数1是资源,布尔值在第72行的C:\ xampp \ htdocs \ tkboom \ includes \ core.php”中给出。任何人都可以看到我犯了错误的地方..

实际上我创建了2个用于递增计数器的php文件和一个用于显示计数器的php文件。在core.php文件中,我编写了函数并显示计数我创建了一个名为view.php的文件

core.php
    function GenerateCount($id, $playCount) {
            global $setting;
            $counter_query = "SELECT hits FROM ava_games WHERE id=".$_GET['id']."";
            $counter_res = mysql_query($counter_query);
            while($counter_row = mysql_fetch_array($counter_res)){
               $counter = $counter_row['hits'] + 1;
               $update_counter_query = "UPDATE ava_games SET hits=".$counter." WHERE id=".$_GET['id']."";
               $playCount = mysql_query($update_counter_query);
               $playCount = $row['hits'];
            }
            return $playCount;

    // Get count END
    }

view.php

<?php

$sql = mysql_query("SELECT * FROM ava_games WHERE published=1 ORDER BY id desc LIMIT 30");
while($row = mysql_fetch_array($sql)) {

    $url = GameUrl($row['id'], $row['seo_url'], $row['category_id']);

    $name = shortenStr($row['name'], $template['module_max_chars']);

    $playRt = GenerateRating($row['rating'], $row['homepage']);

    $playCt = GenerateCount($row['id'], $row['hits']);


    if ($setting['module_thumbs'] == 1) {
        $image_url = GameImageUrl($row['image'], $row['import'], $row['url']);

        $image = '<div class="homepage_game"><div class="home_game_image"><a href="'.$url.'"><img src="'.$image_url.'" width= 180 height= 135/></a></div><div class="home_game_info"><div class="home_game_head"><a href="'.$url.'">'.$name.'</a></div></div><div class="home_game_options"><img class="home_game_options_icon" src="'.$setting['site_url'].'/templates/hightek/images/joystick-icon.png" /> &nbsp;'.$playRt.' <b>|</b> '.$playCt.' plays &nbsp;</div></div>';
        echo $image;
    }



    }

?>

5 个答案:

答案 0 :(得分:4)

这很可能意味着sql语句中存在错误。您可以通过mysql_error()获取有关错误的更多信息  最简单的形式:

$counter_res = mysql_query($counter_query) or die(mysql_error());

(编辑:...最简单的形式,但是使用这种方法你不会让应用程序有机会对问题作出反应,“死”就像“死”一样。而mysql_error()可能泄漏太多信息您的网络服务/网站的用户,请参阅https://www.owasp.org/index.php/Top_10_2007-Information_Leakage_and_Improper_Error_Handling

您的代码也很容易

  • sql injections,因为$ _GET参数被放入语句而不先清理它
  • race conditions因为你有一个复合操作,由一个SELECT和一个UPDATE组成,没有任何锁定机制。

答案 1 :(得分:1)

这是因为您在SQL查询中收到错误 我会稍微改变一下:

$counter_query = 'SELECT hits FROM ava_games WHERE id = ' . (int)$_GET['id'];

确保始终将id与整数值进行比较。

答案 2 :(得分:1)

毕竟,这个查询看起来不太好。第一点:为什么使用两个查询来增加值? UPDATE ava_games SET hits=hits+1 WHERE id=".$_GET['id'].""应该一步到位。第二点:你听说过SQL注入吗?逃避或投射$_GET['id']以避免意外;)

答案 3 :(得分:0)

如果mysql_query返回布尔值,则查询失败。

假定id是主键,您可以使用以下函数在数据库级别更新,以防止竞争条件:

function GenerateCount($playCount) {
    global $setting;
    $update_counter_query = "UPDATE ava_games SET hits=hits + 1 WHERE id=".intval($_GET['id'])."";
    mysql_query($update_counter_query) or die(mysql_error());
    $counter_query = "SELECT hits FROM ava_games WHERE id=".intval($_GET['id'])." LIMIT 1";
    list($playCount) = mysql_fetch_row(mysql_query($counter_query));
    return $playCount;

// Get count END
}

还要注意intval()变量周围的$_GET以防止SQL注入

答案 4 :(得分:0)

首先转换int中的值:

function GenerateCount($playCount) {
    global $setting;
        $counter_query = "SELECT hits FROM ava_games WHERE id=".$_GET['id']."";
        $counter_res = mysql_query($counter_query);
        while($counter_row = mysql_fetch_array($counter_res)){
        $counter = intval($counter_row['hits']) + 1;
        $update_counter_query = "UPDATE ava_games SET hits=".$counter." WHERE id=".$_GET['id']."";
        $playCount = mysql_query($update_counter_query);
        $playCount = $row['hits'];
    }
    return $playCount;

// Get count END
}

并检查链接:

Convert into int