PHP Mysql删除查询无法正常工作

我正在从MYSQL数据库中提取产品列表，并对每个产品使用删除按钮，以防操作员想要删除该产品

问题是每次我点击列表中任何产品的delete按钮时，第一个元素都会被删除

我下面的代码有什么问题

产品

页面：

<?php
$link=mysqli_connect("localhost","root","","smartcart");
$prod="select * from products";
$rw=mysqli_query($link,$prod) or die(mysqli_errno()."in query $prod");
$count=1;

while($row=mysqli_fetch_assoc($rw))
{
    echo "<tr>";
    echo "<td>".$count."</td>";
    echo "<td>".$row['prod_id']."</td>";
    echo "<td>".$row['prod_name']."</td>";
    echo "<td>".$row['prod_price']."</td>";
    echo "<td><form action='delete_prod.php' id='delete' method='get'>";
    echo "<input type='hidden' name='prod_id' value='".$row['prod_id']."' />";
    echo "<button type='submit' form = 'delete' class='btn btn-default' name='delete'>Delete</button>";
    echo "</form></td>";
    $count=$count+1;                        
}

mysqli_free_result($rw);
?>

---

我想我非常遗漏了一些简单的要点，但我无法理解它是什么。

很可能是因为您设置了

id=“delete”

。通常id属性值不会重复

echo "<td><form action='delete_prod.php' id='delete' method='get'>";
echo "<button type='submit' form = 'delete' class='btn btn-default' name='delete'>Delete</button>";

---

检查

prod\u id

是否正确自动递增或不在表中。另一件事是，当表单处于循环中时，所有表单的id都将被复制。所以每次它提交第一个表单时，这就是为什么只从您的记录中删除第一个产品

$link=mysqli_connect("localhost","root","","smartcart");
    $prod="select * from products";
    $rw=mysqli_query($link,$prod) or die(mysqli_errno()."in query $prod");
    $count=1;
    while($row=mysqli_fetch_assoc($rw))
    {
        echo "<tr>";
        echo "<td>".$count."</td>";
        echo "<td>".$row['prod_id']."</td>";
        echo "<td>".$row['prod_name']."</td>";
        echo "<td>".$row['prod_price']."</td>";
        echo "<td><form action='delete_prod.php'  method='get'>";
        echo "<input type='hidden' name='prod_id' value='".$row['prod_id']."' />";
        echo "<input type='submit' value='Delete' class='btn btn-default' name='delete'/>";
        echo "</form></td>";
        $count=$count+1;                        
    }

---

试试这个…

我真的希望这不是互联网上的代码-这是一个即将发生的安全事件！切勿直接使用来自

$\u GET

、

$\u POST

或

$\u REQUEST

的输入！先把它清理干净，即使你确定它没问题！您是否在delete\u prod.php上收到$\u请求['prod\u id']？你有什么错误吗？应该在本地机器上使用。从不上网。是的，我收到

$\u请求['prod\u id']

，但它是第一个产品的id，而不是我要删除的产品的id。否，无错误。页面上列出了多个产品，每个产品都有一个删除按钮，带有一个隐藏的输入字段，其中包含产品的

prod\u id

。当我点击delete按钮时，这个特定的

prod\u id

应该被带到

delete\u prod.php

页面。但是，第一个列出的产品的

prod\u id

被携带了出来。我还没有尝试将表格包装到表单中。将

form='id'

从

按钮中删除
。另外，我还不熟悉您建议的面向对象的形式，但我一定会尝试一下。你能解释一下为什么
form='id'
会导致错误吗？而且
$\u GET['prod'u id']
现在应该是
$\u GET['delete']
，因为你现在已经给按钮分配了值，它的名字是
delete
？@user3736335是的，很抱歉，我修改了错误的代码indexing@user3736335对这就是问题所在，问题在于该id，所发生的是您的按钮被指定用于id为
id=“delete”
的表单。当您循环时，您的标记将明显重复。然后，当您单击delete按钮时，它会得到第一个id为delete的表单，然后它会得到第一个表单，因此只指向第一个隐藏的表单input@user3736335我还建议适应mysqli的面向对象接口，这样您就不需要将
$link
提供给那些需要它的函数。永远不要在查询字符串中直接注入用户输入变量。同时使用prepared语句。它将提交其按钮被单击的表单，而不是第一个表单。使用“查看页面源代码”，您将发现每个表单都有相同的id。虽然您单击的是最后一个表单，但它将调用id首先匹配的表单。您可以尝试此代码-echo“”；回声“；回应“删除”；回声“；
echo "<form action='delete_prod.php' id='delete' method='get'>";

echo '<table>';
while($row = mysqli_fetch_assoc($result)) {
    $prod_id = $row['prod_id'];
    echo "<tr>";
        echo "<td>".$count."</td>";
        echo "<td>".$row['prod_id']."</td>";
        echo "<td>".$row['prod_name']."</td>";
        echo "<td>".$row['prod_price']."</td>";
        echo "<td>";
        // each id is assigned to each button, so that when its submitted you get the designated id, the one that you clicked
        echo "<button type='submit' value='$prod_id' class='btn btn-default' name='delete'>Delete</button>";
        echo "</td>";
    echo '</tr>';
}

echo '</table>';
echo '</form>';

if(isset($_GET['delete'])) // as usual
{
    include "connection.php";
    $prod_id = $_GET['delete']; // get the id
    // USE PREPARED STATEMENTS!!!
    $del="DELETE FROM products WHERE prod_id = ?";
    $delete = $link->prepare($del);
    $delete->bind_param('i', $prod_id);
    $delete->execute();
    // don't echo anything else, because you're going to use header
    if($delete->affected_rows > 0) {
        header('location:show_db.php');
    } else {
        echo 'Sorry delete did not push thru!';
    }
}

$link=mysqli_connect("localhost","root","","smartcart");
    $prod="select * from products";
    $rw=mysqli_query($link,$prod) or die(mysqli_errno()."in query $prod");
    $count=1;
    while($row=mysqli_fetch_assoc($rw))
    {
        echo "<tr>";
        echo "<td>".$count."</td>";
        echo "<td>".$row['prod_id']."</td>";
        echo "<td>".$row['prod_name']."</td>";
        echo "<td>".$row['prod_price']."</td>";
        echo "<td><form action='delete_prod.php'  method='get'>";
        echo "<input type='hidden' name='prod_id' value='".$row['prod_id']."' />";
        echo "<input type='submit' value='Delete' class='btn btn-default' name='delete'/>";
        echo "</form></td>";
        $count=$count+1;                        
    }

     if(isset($_GET['delete']))
{
    include "connection.php";
    $prod_id=$_REQUEST['prod_id'];
        $del="delete from products where prod_id=$prod_id";
    if (mysqli_query($link,$del))
    {
        echo "Successfully deleted";
        unset($_GET['delete']);
    }
    else
    {
        echo "Delete operation Failed";
    }
    header('location:show_db.php');
}