php - 在php中删除网格中的行时出错

Question

我已经以网格格式显示了一些数据，现在我试图通过单击最后一行中的删除按钮来删除该行，但出现错误。有人可以告诉我我犯了什么错误吗？我的代码:

<form action="deleteQuote.php" method="post">
            <?php
                require_once('config.php');
                $conn = new mysqli(DB_HOST, DB_USER, DB_PASSWORD, DB_DATABASE) 
                or die ('Cannot connect to db');
                $result = $conn->query("SELECT quoteid,name,quote FROM `quotes`, category WHERE category.catid = quotes.catid and quotes.isactive = 1");
                echo "<table>";
                while ($row = $result->fetch_assoc()) {
                echo "<tr><td><input type='hidden' name='delete_id' value=$row[quoteid] /></td> <td>$row[name]</td><td>$row[quote]</td>
                    <td><input type='submit' value='Delete' /></td></tr>";
                }
                echo "</table>";
            ?>
            </form>

deleteQuote.php:

<?php
if(isset($_POST['delete_id']) && !empty($_POST['delete_id'])){
    require_once('config.php');
    $conn = new mysqli(DB_HOST, DB_USER, DB_PASSWORD, DB_DATABASE) 
    or die ('Cannot connect to db');
    $delete_id = mysql_real_escape_string($_POST['delete_id']);
    echo "DELETE FROM quotes WHERE quoteid =".$delete_id;
    $result = $conn->query("DELETE FROM quotes WHERE quoteid =".$delete_id);

}
header('Location: quotes.php');

？>

我收到以下错误:

Warning: mysql_real_escape_string() [function.mysql-real-escape-string]: Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2) in /home/content/38/11053638/html/admin/deleteQuote.php on line 6
Warning: mysql_real_escape_string() [function.mysql-real-escape-string]: A link to the server could not be established in /home/content/38/11053638/html/admin/deleteQuote.php on line 6 DELETE FROM quotes WHERE quoteid = Warning: Cannot modify header information - headers already sent by (output started at /home/content/38/11053638/html/admin/deleteQuote.php:6) in /home/content/38/11053638/html/admin/deleteQuote.php on line 11

Answer 1

如果尚未打开 mysql 连接，则无法使用 mysql_real_escape_string()。您使用的是 mysqli 而不是 mysql，因此您需要使用等效的 mysqli 方法。

更改:

$delete_id = mysql_real_escape_string($_POST['delete_id']);

至:

$delete_id = $conn->real_escape_string($_POST['delete_id']);

但是，由于 mysqli 支持准备好的语句，因此您应该使用它而不是连接字符串。那么你就不必担心转义字符串。