How to DROP a table inside while loop of SELECT in PHP? - php

Question

I have a table where I store all the machine details, I need to delete all data and drop all tables of a specific user.
I'm trying to DROP tables based on the result from Select query, but it's not working as it is inside WHILE of SELECT query. Kindly help me with this.
$sql="SELECT M_ID FROM machine_details WHERE Username='".$inname."'";
$result=mysqli_query($conn,$sql);
while($row=mysqli_fetch_assoc($result))
{
$delmid=$row['M_ID'];
$delsta=$delmid."_status";
$delpar=$delmid."_parameter";
$sql1="DROP TABLE IF EXISTS $delpar, $delsta";
if(!mysqli_query($conn,$sql1))
{
echo "Error in drop".mysqli_error($conn);
}
else
{
$sql2="DELETE FROM machine_details WHERE M_ID=".$delmid;
if(!mysqli_query($conn,$sql2))
{
echo "Error in machine delete".mysqli_error($conn);
}
}
I'm not getting any errors from PHP or MariaDB, but the code doesn't DROP the table(It exists in phpmyadmin).
Any alternate or more efficient methods are also welcome.
UPDATE : The above code works perfectly fine now, kindly see the edit logs for better understanding about the issue I faced.

Answer 1

ID is int type! Dont place it in quotes. Right method is:
$sql2="DELETE FROM machine_details WHERE M_ID=".$delmid;

Answer 2

Try with Following Code to Delete.
For Delete you can use this code.
<?php
//delete.php
include("connection.php");
if(isset($_POST["_id"]))
{
$query = "DELETE FROM app WHERE _id = '".$_POST["_id"]."'";
if(mysqli_query($connection, $query))
{
echo 'Data Deleted';
}
}
?>
Note: Don't Delete any user data from the table, because if you need any history or detail report you can use this, for this you can put one flag.

Answer 3

Just remove the backquotes(`)
With its use M_ID is being converted to String type. Which should not happen... Because the primary key is int in your case
DELETE FROM machine_details WHERE M_ID=".$delmid;