Mysql get last insert id c#

Get ID of The Last Inserted Record

If we perform an INSERT or UPDATE on a table with an AUTO_INCREMENT field, we can get the ID of the last inserted/updated record immediately.

In the table "MyGuests", the "id" column is an AUTO_INCREMENT field:

CREATE TABLE MyGuests (
id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY,
firstname VARCHAR(30) NOT NULL,
lastname VARCHAR(30) NOT NULL,
email VARCHAR(50),
reg_date TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
)

The following examples are equal to the examples from the previous page (PHP Insert Data Into MySQL), except that we have added one single line of code to retrieve the ID of the last inserted record. We also echo the last inserted ID:

Example (MySQLi Object-oriented)

$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
  die("Connection failed: " . $conn->connect_error);
}

$sql = "INSERT INTO MyGuests (firstname, lastname, email)
VALUES ('John', 'Doe', '')";

if ($conn->query($sql) === TRUE) {
  $last_id = $conn->insert_id;
  echo "New record created successfully. Last inserted ID is: " . $last_id;
} else {
  echo "Error: " . $sql . "
" . $conn->error;
}

$conn->close();
?>

Example (MySQLi Procedural)

$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";

// Create connection
$conn = mysqli_connect($servername, $username, $password, $dbname);
// Check connection
if (!$conn) {
  die("Connection failed: " . mysqli_connect_error());
}

$sql = "INSERT INTO MyGuests (firstname, lastname, email)
VALUES ('John', 'Doe', '')";

if (mysqli_query($conn, $sql)) {
  $last_id = mysqli_insert_id($conn);
  echo "New record created successfully. Last inserted ID is: " . $last_id;
} else {
  echo "Error: " . $sql . "
" . mysqli_error($conn);
}

mysqli_close($conn);
?>

Example (PDO)

$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDBPDO";

try {
  $conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
  // set the PDO error mode to exception
  $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
  $sql = "INSERT INTO MyGuests (firstname, lastname, email)
  VALUES ('John', 'Doe', '')";
  // use exec() because no results are returned
  $conn->exec($sql);
  $last_id = $conn->lastInsertId();
  echo "New record created successfully. Last inserted ID is: " . $last_id;
} catch(PDOException $e) {
  echo $sql . "
" . $e->getMessage();
}

$conn = null;
?>

My code does not work for me. Any idea to recover the id of my last insert this is my code I am new developing and I do not know much

I GOT ERROR IN THE QUERY AND I DON'T KNOW HOW TO SEND PRINT IN THE LINE OF $ session-> msg ('s', "Product added successfully. Make cost configuration". LAST_INSERT_ID ());

ALREADY VERIFY AND IT IS CORRECT THE CONNECTION AND THE FIELDS OF THE DATABASE.

escape($_POST['codigobarras']));
     $identificador   = remove_junk($db->escape($_POST['identificador']));
     $nombre   = remove_junk($db->escape($_POST['nombre']));
     $categoria   =  (int)$db->escape($_POST['categoria']);
     $etiquetas   =  remove_junk($db->escape($_POST['etiquetas']));
     $unidadmedida   =  remove_junk($db->escape($_POST['unidadmedida']));
     $proveedor   =  remove_junk($db->escape($_POST['proveedor']));
     $fabricante   =  remove_junk($db->escape($_POST['idfabricante']));
     $maximo   =  remove_junk($db->escape($_POST['maximo']));
     $minimo   =  remove_junk($db->escape($_POST['minimo']));
     $descripcion   =  remove_junk($db->escape($_POST['descripcion']));
     $dias_vencimiento   =  remove_junk($db->escape($_POST['dias_vencimiento']));
      
     $servicio   = "0";
      if (isset($_POST['servicio'])){
        $servicio =implode($_POST['servicio']);
     }
     $numeroserie   = "0"; 
      if (isset($_POST['numeroserie'])){
        $numeroserie =implode($_POST['numeroserie']);
     }

     $ingrediente   =  "0";
      if (isset($_POST['ingrediente'])){
        $ingrediente =implode($_POST['ingrediente']);
     }

     $date    = make_date();
     $query  = "INSERT INTO productos (";
     $query .=" codigo_barras,identificador_producto,nombre,idcategoria,idetiquetas,unidad_medida,idproveedor,idfabricante,max_productos,min_productos,descripcion,dias_vencimiento,servicio,numero_serie,ingrediente,activo";
     $query .=") VALUES (";
     $query .=" '{$codigobarras}', '{$identificador}', '{$nombre}', '{$categoria}', '{$etiquetas}', '{$unidadmedida}', '{$proveedor}', '{$fabricante}', '{$maximo}', '{$minimo}', '{$descripcion}', '{$dias_vencimiento}', '{$servicio}', '{$numeroserie}', '{$ingrediente}', '1'";
     $query .=");";
     $query .="SELECT LAST_INSERT_ID();";

     if($db->query($query)){
      $session->msg('s',"Producto agregado exitosamente. Realizar configuracion de costos" . LAST_INSERT_ID());
       redirect('precio_producto.php', false);
     } else {
       $session->msg('d',' Lo siento, registro falló.');
       redirect('informacion_producto.php', false);
     }
   } else{
     $session->msg("d", $errors);
     redirect('informacion_producto.php',false);
   }
 }
?>

How do I get the last inserted id in MySQL?

How do I get the last INSERT id?

What does last INSERT id return?

How can I get last INSERT id in PDO?