Question

以下是我的sql代码

<?php
include 'config.php';
$user_ip = $_SERVER['REMOTE_ADDR'];
$pageID = '33'; // The ID of the page, the article or the video ...

//function to calculate the percent
function percent($num_amount, $num_total) {
    $count1 = $num_amount / $num_total;
    $count2 = $count1 * 100;
    $count = number_format($count2, 0);
    return $count;
}

// check if the user has already clicked on the unlike (rate = 2) or the like (rate = 1)
$dislike_sql = mysql_query('SELECT COUNT(*) FROM  wcd_yt_rate WHERE ip = "'.$user_ip.'" and id_item = "'.$pageID.'" and rate = 2 ');
$dislike_count = mysql_result($dislike_sql, 0);

$like_sql = mysql_query('SELECT COUNT(*) FROM  wcd_yt_rate WHERE ip = "'.$user_ip.'" and id_item = "'.$pageID.'" and rate = 1 ');
$like_count = mysql_result($like_sql, 0);

// count all the rate 
$rate_all_count = mysql_query('SELECT COUNT(*) FROM  wcd_yt_rate WHERE id_item = "'.$pageID.'"');
$rate_all_count = mysql_result($rate_all_count, 0);

$rate_like_count = mysql_query('SELECT COUNT(*) FROM  wcd_yt_rate WHERE id_item = "'.$pageID.'" and rate = 1');
$rate_like_count = mysql_result($rate_like_count, 0);
$rate_like_percent = percent($rate_like_count, $rate_all_count);

$rate_dislike_count = mysql_query('SELECT COUNT(*) FROM  wcd_yt_rate WHERE id_item = "'.$pageID.'" and rate = 2');
$rate_dislike_count = mysql_result($rate_dislike_count, 0);
$rate_dislike_percent = percent($rate_dislike_count, $rate_all_count);
?>

我尝试用以下代码替换此代码，但我收到多个错误

<?php
include 'config.php';
$user_ip = $_SERVER['REMOTE_ADDR'];
$pageID = '33'; // The ID of the page, the article or the video ...
//function to calculate the percent
function percent($num_amount, $num_total) {
    $count1 = $num_amount / $num_total;
    $count2 = $count1 * 100;
    $count = number_format($count2, 0);
    return $count;
}
// check if the user has already clicked on the unlike (rate = 2) or the like (rate = 1)
$dislike_sql = $db->prepare('SELECT COUNT(*) FROM  wcd_yt_rate WHERE ip = "'.$user_ip.'" and id_item = "'.$pageID.'" and rate = 2 ');
$dislike_count = $db->query($dislike_sql, 0);
$like_sql = $db->prepare('SELECT COUNT(*) FROM  wcd_yt_rate WHERE ip = "'.$user_ip.'" and id_item = "'.$pageID.'" and rate = 1 ');
$like_count = $db->query($like_sql, 0);
// count all the rate 
$rate_all_count = $db->prepare('SELECT COUNT(*) FROM  wcd_yt_rate WHERE id_item = "'.$pageID.'"');
$rate_all_count = $db->query($rate_all_count, 0);
$rate_like_count = $db->prepare('SELECT COUNT(*) FROM  wcd_yt_rate WHERE id_item = "'.$pageID.'" and rate = 1');
$rate_like_count = $db->query($rate_like_count, 0);
$rate_like_percent = percent($rate_like_count, $rate_all_count);
$rate_dislike_count = $db->prepare('SELECT COUNT(*) FROM  wcd_yt_rate WHERE id_item = "'.$pageID.'" and rate = 2');
$rate_dislike_count = $db->query($rate_dislike_count, 0);
$rate_dislike_percent = percent($rate_dislike_count, $rate_all_count);
?>

我的代码Warning: PDO::query() expects parameter 1 to be string, object given line 32, 34,37,39

中的错误

已编辑的代码

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8" />
        <title>WebCodo :: Like & Dislike System With jQuery Ajax and PHP</title>
        <link type="text/css" rel="stylesheet" href="css/style.css">
        <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
    </head>
    <body>
        <div class="webcodo-top" >
            <a href="http://webcodo.com/like-dislike-system-with-jquery-ajax-and-php-youtube-like-design">
                <div class="wcd wcd-tuto"> < Come back to the tuto page</div>
            </a>
            <a href="http://webcodo.com">
                <div class="wcd wcd-logo">WEBCODO</div>
            </a>
            <div class="wcd"></div>
        </div>
        <?php
        include 'config.php';
        $user_ip = $_SERVER['REMOTE_ADDR'];
        $pageID = '33'; // The ID of the page, the article or the video ...
        //function to calculate the percent

        function percent($num_amount, $num_total) {
            $count1 = $num_amount / $num_total;
            $count2 = $count1 * 100;
            $count = number_format($count2, 0);
            return $count;
        }

        // check if the user has already clicked on the unlike (rate = 2) or the like (rate = 1)
        $dislike_stmt = $db->prepare('SELECT COUNT(*) FROM  wcd_yt_rate WHERE ip = :user_ip and id_item = :item_id and rate = 2;');
        $dislike_stmt->execute(array(':user_ip' => $user_ip, ':item_id' => $pageID));
        $dislike_count = $dislike_stmt->fetchColumn();

        $like_sql = $db->prepare('SELECT COUNT(*) FROM  wcd_yt_rate WHERE ip =:user_ip and id_item =:item_id and rate = 1 ');
        $like_sql->execute(array(':user_ip' => $user_ip, ':item_id' => $pageID));
        $like_count = $like_sql->fetchColumn();

        // count all the rate 

        $rate_all_count = $db->prepare('SELECT COUNT(*) FROM  wcd_yt_rate WHERE id_item =:item_id');
        $rate_all_count->execute(array(':item_id' => $pageID));
        $rate_all_count = $rate_all_count->fetchColumn();

        $rate_like_count = $db->prepare('SELECT COUNT(*) FROM  wcd_yt_rate WHERE id_item =:item_id and rate = 1');
        $rate_like_count->execute(array(':item_id' => $pageID));
        $rate_like_percent = $rate_like_count->fetchColumn();

        $rate_dislike_count = $db->prepare('SELECT COUNT(*) FROM  wcd_yt_rate WHERE id_item =:item_id and rate = 2');
        $rate_dislike_count->execute(array(':item_id' => $pageID));
        $rate_dislike_percent = $rate_dislike_count->fetchColumn();

        $rate_dislike_percent = percent($rate_dislike_count, $rate_all_count);
        ?>

        <script>
            $(function () {
                var pageID = <?php echo $pageID; ?>;

                $('.like-btn').click(function () {
                    $('.dislike-btn').removeClass('dislike-h');
                    $(this).addClass('like-h');
                    $.ajax({
                        type: "POST",
                        url: "ajax.php",
                        data: 'act=like&pageID=' + pageID,
                        success: function () {
                        }
                    });
                });
                $('.dislike-btn').click(function () {
                    $('.like-btn').removeClass('like-h');
                    $(this).addClass('dislike-h');
                    $.ajax({
                        type: "POST",
                        url: "ajax.php",
                        data: 'act=dislike&pageID=' + pageID,
                        success: function () {
                        }
                    });
                });
                $('.share-btn').click(function () {
                    $('.share-cnt').toggle();
                });
            });
        </script>
        <div class="tab-cnt">
            <h1>Youtube Like & Dislike System With PHP, jQuery & Ajax</h1>
            <div class="tab-tr" id="t1">
                <div class="like-btn <?php
                if ($like_count == 1) {
                    echo 'like-h';
                }
                ?>">Like</div>
                <div class="dislike-btn <?php
                if ($dislike_count == 1) {
                    echo 'dislike-h';
                }
                ?>"></div>

                <div class="share-btn">Share</div>
                <div class="stat-cnt">
                    <div class="rate-count"><?php echo $rate_all_count; ?></div>
                    <div class="stat-bar">
                        <div class="bg-green" style="width:<?php echo $rate_like_percent; ?>%;"></div>
                        <div class="bg-red" style="width:<?php echo $rate_dislike_percent; ?>%"></div>
                    </div><!-- stat-bar -->
                    <div class="dislike-count"><?php echo $rate_dislike_count; ?></div>
                    <div class="like-count"><?php echo $rate_like_count; ?></div>
                </div><!-- /stat-cnt -->
            </div><!-- /tab-tr -->
            <div class="share-cnt">
                <!-- AddThis Button BEGIN -->
                <div class="addthis_toolbox addthis_default_style ">
                    <a class="addthis_button_linkedin_counter"></a>
                    <a class="addthis_button_facebook_like" fb:like:layout="button_count"></a>
                    <a class="addthis_button_tweet"></a>
                    <a class="addthis_button_google_plusone" g:plusone:size="medium"></a> 
                    <a class="addthis_button_pinterest_pinit"></a>
                    <a class="addthis_counter addthis_pill_style"></a>
                </div>
            </div><!-- /share-cnt -->
        </div><!-- /tuto-cnt -->
    </body>
</html>

上面编辑后

我收到以下错误

Notice: Object of class PDOStatement could not be converted to int in C:\Users\sanoj\Documents\NetBeansProjects\like youtube\index.php on line 26
Call Stack
#   Time    Memory  Function    Location
1   0.0020  254504  {main}( )   ..\index.php:0
2   0.0260  291496  percent( )  ..\index.php:50

( ! ) Warning: Division by zero in C:\Users\sanoj\Documents\NetBeansProjects\like youtube\index.php on line 26
Call Stack
#   Time    Memory  Function    Location
1   0.0020  254504  {main}( )   ..\index.php:0
2   0.0260  291496  percent( )  ..\index.php:50

( ! ) Notice: Object of class PDOStatement could not be converted to int in C:\Users\sanoj\Documents\NetBeansProjects\like youtube\index.php on line 26
Call Stack
#   Time    Memory  Function    Location
1   0.0020  254504  {main}( )   ..\index.php:0
2   0.0370  295088  percent( )  ..\index.php:55

( ! ) Warning: Division by zero in C:\Users\sanoj\Documents\NetBeansProjects\like youtube\index.php on line 26
Call Stack
#   Time    Memory  Function    Location
1   0.0020  254504  {main}( )   ..\index.php:0
2   0.0370  295088  percent( )  ..\index.php:55

Answer 1

使用预准备语句与使用纯SQL查询不同。有关此问题，请参阅PHP documentation。有很好的例子如何使用预准备语句和绑定参数。例如，检索不喜欢计数应如下所示：

$dislike_stmt = $db->prepare('SELECT COUNT(*) FROM  wcd_yt_rate WHERE ip = :user_ip and id_item = :item_id and rate = 2;');
$dislike_stmt->execute(array(':user_ip' => $user_ip, ':item_id' => $pageID));
$dislike_count = $dislike_stmt->fetchColumn();

使用绑定参数还可以避免SQL注入威胁。

Answer 2

您正在使用$stmt = $db->prepare()，然后使用PreparedStatement对象调用query($stmt,...)。这在PDO中是错误的。

您需要在每个PreparedStatement对象上调用$stmt->execute()方法。阅读本文以获得解释和示例。 http://php.net/manual/en/pdo.prepare.php

然后，当您拨打$stmt->execute()时，您需要致电$stmt->fetch()以检索结果。请注意，您的SELECT COUNT(*) FROM ...个查询都会返回一行，其中包含一列，因此您需要仅为这些查询调用$stmt->fetch()。阅读本文，尤其是示例3. http://php.net/manual/en/pdo.prepared-statements.php

从行中只获取一列的有效快捷方式是$stmt->fetchColumn(0)。读这个。 http://php.net/manual/en/pdostatement.fetchcolumn.php但请注意，不要仅对多行结果集使用此调用一次，或者可以在$stmt中保留部分未获取的结果集。读这个。 http://php.net/manual/en/pdostatement.closecursor.php

将旧的sql代码替换为pdo

2 个答案: