เขียนแอพจะให้เพิ่มข้อมูลเข้าmsql ข้อมูลไม่ขึ้นแต่ไม่เข้าฐานข้อมูล

<?php
$servername = "localhost";
$username ="root";
$password = "";
$dbname = "stockit";
 
// Create connection
//echo $servername." ".$username." ".$password." ".$dbname;
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
} 
   // Change character set to utf8
    mysqli_set_charset($conn,"utf8");
     
    $ID = $_POST["ID"];
    $Namep = $_POST["Namep"];
    $Type  = $_POST["Type"];
    $Unit = $_POST["Unit"];
    $Price = $_POST["Price"];
    $Balance = $_POST["Balance"];
  
 
  $sql = "INSERT INTO import_product (ID,Namep,Type,Unit,Price,Balance) VALUES ('$ID','$Namep','$Type','$Unit','$Price','$Balance')";
 
if ($conn->query($sql) === TRUE) {
    $response = array();
    $response["success"] = true;  
} else {
    $response = array();
    $response["success"] = false;
}
 
$conn->close();
echo json_encode($response)
?>