从服务器删除行时遇到问题

Question

So in short i am having issues getting my code to remove rows from my database table "tblsurvey" when i run the code there is no errors displaying and it appears to execute the statement correctly however when checking the table i find the row has not been deleted.

<?php //set a question from the database V1.0
require '../configure.php'; //required to connect to the DB
//initialising variables
    $qID = ''; //question ID
    $dropDown = ''; //drop down box
    $startSelect = '<select name=drop1>'; //initial value of select
    $endSelect = '</select>'; //end of select
    $fullHTML = ''; //display the dropdown menus options
    $getDropdownID = ''; //on button submit grabs the UID for the questionairre
    $hiddenTag = '';

    $DB = "questonaire"; //must match Database
    $db_isFound = new mysqli(DB_SERVER, DB_USER, DB_PASS, $DB); //connecting to the database see ../configure.php for details 

    //checking if button as been pressed -- needs to redirect to the appropriate questionaire on pressed
    if (isset($_GET['submit'])){
     //initialising the selected questionaire ID  
        $getDropdownID = $_GET['drop1'];
        //display the selected questionaire
        if ($db_isFound){
            $SQL = "DELETE FROM tblsurvey WHERE ID = ?";
            $SQL_stmt = $db_isFound->prepare($SQL);
            if($SQL_stmt){
                $SQL_stmt->bind_param("s", $qID);
                $SQL_stmt->execute();
                print("question has been successfully removed from the database.");

            }else{
                print("There was a problem running your query: row not deleted");
            }

        }else{
           print("error connecting to DB: Question not deleted");
        }
    } 

It outputs correctly and displays

print("question has been successfully removed from the database.");

however the row is not removed from the table.

any help would be greatly appreciated.

Answer 1

in this line

$SQL_stmt->bind_param("s", $qID);

replace $qID for $getDropdownID because I don't see where $qID get value.

Answer 2

谢谢您看一下，我有点放屁了，在准备好的声明中称错误的var为解决方法

$SQL_stmt->bind_param("i", $getDropdownID);