Question

嗨，我正在尝试使用where子句从MYSQL数据库中的表中删除一条记录。到目前为止，这是我所能得到的，但是没有用，我不确定如何去做。有没有办法使这项工作？我已经包括了我的删除方法和php文件代码。

我的网址-

 deleteCompletedGoal=("http://10.0.2.2/deleteCompletedGoalAddress.php?user_goal_id="+completed_goalID);

我的代码-

 private void deleteNonActiveGoal(){
        try {
            URL url = new URL(deleteCompletedGoal);
            HttpURLConnection http = (HttpURLConnection) url.openConnection();
            http.setRequestMethod("POST");
            http.setRequestProperty("X-HTTP-Method-Override", "DELETE");
            http.setDoInput(true);
            http.setDoOutput(true);

            OutputStream ops = http.getOutputStream();
            BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(ops, "UTF-8"));
            String data = URLEncoder.encode("user_goal_id", "UTF-8") + "=" + URLEncoder.encode(completed_goalID, "UTF-8") + "&&";

            writer.write(data);
            writer.flush();
            writer.close();
            ops.close();

            InputStream ips = http.getInputStream();
            BufferedReader reader = new BufferedReader(new InputStreamReader(ips, "ISO-8859-1"));

            String line;
            while ((line = reader.readLine()) != null) {
                result += line;
            }
            reader.close();
            ips.close();
            http.disconnect();

        }
        catch (MalformedURLException e) {
            result = e.getMessage();
        } catch (IOException e) {
            result = e.getMessage();
        }

    }

PHP文件：

<?php
require "connection.php";

$completed_goalID=$_POST["user_goal_id"];


$mysql_qry = "DELETE from user_goals WHERE user_goal_id ='$completed_goalID'";

if($conn->query($mysql_qry) === TRUE) {
echo "delete successful";
}
else{
echo "delete failed";
}
$conn->close();
?>

Answer 1

由于要在查询字符串中发送变量，因此将使用GET而不是POST。更改：

 $completed_goalID=$_POST["user_goal_id"];

到

$completed_goalID=$_GET["user_goal_id"];

警告

Little Bobby说 your script is at risk for SQL Injection Attacks. 了解有关prepared的MySQLi语句。甚至escaping the string都不安全！

Answer 2

使用$ _GET作为来自URL的catch变量，例如：

$completed_goalID=$_GET["user_goal_id"];

更改查询以防止sql攻击（Reference），例如：

 <?php
    require "connection.php";

    $completed_goalID=$_POST["user_goal_id"];


    $mysql_qry = $conn->prepare("DELETE from user_goals WHERE user_goal_id=?");
    $mysql_qry->bind_param('i',$completed_goalID);
    if($mysql_qry->execute() === TRUE){

    echo "delete successful";
    }
    else{
    echo "delete failed";
    }
   $mysql_qry->close();
    $conn->close();
    ?>

通过用户ID变量

2 个答案: