Question

我有一个问题，我无法解决。当我创建此代码并运行它时，它总是删除mysql数据库的最后一行。请帮助我们.Ty：D

我在发布代码时遇到了一些问题，所以你可以在这里找到它jsfiddle.net/xhCLz/
在“javascript”框下。

<?php
$con=mysqli_connect("localhost","root","","test");

// Check connection
if (mysqli_connect_errno())
  {
  echo "Failed to connect to MySQL: " . mysqli_connect_error();
  }

$result = mysqli_query($con,"SELECT * FROM test_mysql");
$postid1 ="1";
while($row = mysqli_fetch_array($result))
  {
    $ime=$row['name'];
    $prezime=$row['lastname'];
    $id_number=$row['id'];
  echo $ime. " " . $prezime. " " .$id_number. "<form action='' method='post'>

<input type='hidden' name='id_number_send' value='<?php echo $id_number?>'/>
<input type='submit' name='send_value' value='delete' />
</form>";

  }
  if(isset($_POST['send_value']))
{

    $delete_row = mysqli_query($con,"DELETE FROM test_mysql WHERE id='$id_number'");
    echo $id_number;

}

Answer 1

你没有从POST中获取id，而是在上一次执行循环时使用id。

您必须从$_POST变量（$_POST['id_number_send']）获取要删除的行的ID，并在查询中使用它之前清理数据以防止SQL注入（{{3} }）。

如果要显示没有删除的所有行，也应该在循环之前进行删除。

if(isset($_POST['send_value']))
{
    $deleteId = mysqli_real_escape_string($con, $_POST['id_number_send']);
    $delete_row = mysqli_query($con,"DELETE FROM test_mysql WHERE id='$deleteId'");
    echo "ID number: " . $deleteId . " has been deleted.<br><br>";
}
$result = mysqli_query($con,"SELECT * FROM test_mysql");
$postid1 ="1";
while($row = mysqli_fetch_array($result))
  {
    $ime=$row['name'];
    $prezime=$row['lastname'];
    $id_number=$row['id'];
  echo $ime. " " . $prezime. " " .$id_number. "<form action='' method='post'>

<input type='hidden' name='id_number_send' value='$id_number' />
<input type='submit' name='send_value' value='delete' />
</form>";

  }

Answer 2

你的while循环最后一次运行时，它会将它找到的最后一个ID分配给变量$ id_number：

while($row = mysqli_fetch_array($result))
{
    $ime=$row['name'];
    $prezime=$row['lastname'];
    $id_number=$row['id'];
    //etc.

因此，不应让DELETE查询使用该变量（它始终是它找到的最后一个数字），而应使用提交表单中的变量，即$ _POST变量：

$delete_row = mysqli_query($con,"DELETE FROM test_mysql WHERE id='$_POST['id_number_send']'");

使用php删除mysql中的行的问题

2 个答案: