Question

先谢谢了。我只是在学习php。我正在尝试从我创建的博客中删除帖子。我应该通过post_id删除帖子，后者是自动递增的主键。

但是我如何在WHERE子句中使用post_id？

我的代码是：

$servername = "localhost";
$username = "root";
$password = "";
$dbname = "travelogy";
try{
    $conn = new PDO("mysql:host=$servername; dbname=$dbname", $username, $password);

    //  $post_id_location->bindValue(':post_id', $post_id);
    $delete_quary = "DELETE FROM post_p WHERE id ="$_POST['post_id'];
    //   $delete_quary = "DELETE FROM post_p WHERE id = $post_id_location";
    $conn->exec($delete_quary);
    echo "Record deleted.";
    }catch(PDOException $e){
        echo $delete_quary."<br>".$e->getMessage();
    }
$conn = null;

错误提示：未定义的变量：第10行的C：\ xampp \ htdocs \ CMS_project \ pdo.php中的post_id_location 致命错误：未捕获错误：在C：\ xampp \ htdocs \ CMS_project \ pdo.php：10中调用成员函数bindValue（）上的null堆栈跟踪：＃0 {main}抛出在C：\ xampp \ htdocs \ CMS_project \第10行的pdo.php

Answer 1

更改：

$delete_quary = "DELETE FROM post_p WHERE id ="$_POST['post_id'];

收件人：

$delete_quary = "DELETE FROM post_p WHERE id = " . $_POST['post_id'];

或者：

$post_id = $_POST['post_id'];
$delete_quary = "DELETE FROM post_p WHERE id = '$post_id'";

也许也考虑将“ quary”重命名为“ query”，以供将来参考。

如何删除id是post id，sql，php的位置

1 个答案: