PHP MySQL删除行

我到处都找遍了，找不到答案，我相信我有正确的代码，但可能是打字错误

这里出了什么问题

我有一个将产品id正确发布到url的链接，如图所示：

userAccount.php

：

while($columnDelete = mysqli_fetch_array($query, MYSQLI_ASSOC)){
        echo "<section class='product'>
                <a href='extras/deleteProcess.php?productId=".$columnDelete['productId']."' class='deleteProduct' style='color:#990000;font-family:arial;font-weight:bold;font-size:12pt;background:transparent;'>Delete?</a>
                <section class='productImg'>
                    <a target='_self' href='fullProductInfo.php?productId=".$columnDelete['productId']."'>
                        <img src='http://www.littlepenguindesigns.co.uk/pages/CMX/images/products/".$columnDelete['productImg']."' alt='".$columnDelete['productName']."' border='0' width='230' height='200' border='0' />
                    </a>
                </section>
                <section class='productName'><a target='_self' href='fullProductInfo.php?productId=".$columnDelete['productId']."'>".$columnDelete['productName']."</a></section>
                <section class='productPrice'>&pound;".$columnDelete['price']."</section></section>";
    }

$productId = $_GET['productId'];
$con = mysqli_connect("BLAH","BLAH","BLAH","BLAH") or die('Server connection not possible.');
$sql = ("DELETE FROM `product` WHERE `product`.`productId`= $productId");
mysqli_query($con, $sql);

echo "Deleted product ID: $productId successfully.<br /><br /><br /><br /><br /><br /> <a href='../userAccount.php#deletion'>Go back to user account and delete another.</a>";

---

我无法理解发生了什么，该产品被调用到

deleteProcess.php

页面上，但没有删除，也没有显示任何错误。由于我对php和mysql还不熟悉，所以我认为我最好进行研究，因为我没有找到我想问的答案，所以谁能告诉我我做错了什么，或者给我指出了正确的方向。

检查查询执行返回成功与否

$productId = $_GET['productId'];
$con = mysqli_connect("BLAH","BLAH","BLAH","BLAH") or die('Server connection not possible.');
$sql = ("DELETE FROM `product` WHERE `product`.`productId`= $productId");

$result = mysqli_query($con, $sql);
if(!$result)
   die("Query failed".mysql_error());

echo "Deleted product ID: $productId successfully.<br /><br /><br /><br /><br /><br /> <a href='../userAccount.php#deletion'>Go back to user account and delete another.</a>";

$productId=$\u GET['productId']；
$con=mysqli_connect（“废话”、“废话”、“废话”、“废话”）或die（“服务器连接不可能”）；
$sql=（“从`product`中删除，其中`product`.`productId`=$productId”）；
$result=mysqli\u查询（$con，$sql）；
如果（！$result）
die（“查询失败”。mysql_error（））；
echo“已删除产品ID:$productId成功。





；

到

警告此代码易受SQL注入攻击。 通过清理所有用户输入修复sql注入

$productId = mysql_real_escape_string($_GET['productId']); // use mysql_real_escape_string on $_GET
$con = mysqli_connect("BLAH","BLAH","BLAH","BLAH") or die('Server connection not possible.');
$sql = "DELETE FROM `product` WHERE `product`.`productId`= '$productId'"; //add single quotes around variable $productid to seperate string from query
mysqli_query($con, $sql);

---

检查mysql是否连接或notecho查询，然后直接运行到phpmyadmin中，然后查看错误是什么

$sql = "DELETE FROM `product` WHERE `product`.`productId`= $productId";
mysqli_query($con,$sql) OR DIE(mysqli_error($con)); //useful for debugging

$productId = mysql_real_escape_string($_GET['productId']); // use mysql_real_escape_string on $_GET
$con = mysqli_connect("BLAH","BLAH","BLAH","BLAH") or die('Server connection not possible.');
$sql = "DELETE FROM `product` WHERE `product`.`productId`= '$productId'"; //add single quotes around variable $productid to seperate string from query
mysqli_query($con, $sql);