Php 如何在两个不同的mySQL表中存储相同的数据？

当新客户购买产品时，我希望在clients表中存储客户详细信息，并在orders表中存储相应的客户ID

订单表：

order_ID   product   client   
============================
 1501      bag         1
 1502      shoe        2  

客户表：

client_ID   name      
=================
   1       Frank         
   2       John   

我找到了一个可行的解决方案，但我觉得这不是最明智的解决方案

$sql = "INSERT INTO clients(name) VALUES(?)";
$q = $con->prepare($sql);
$q->execute(array($name));

$sql = "INSERT INTO orders(product) VALUES(?)";
$q = $con->prepare($sql);
$q->execute(array($product));

$sql = 'SELECT * FROM clients ORDER BY client_ID DESC LIMIT 0, 1';
foreach ($con->query($sql) as $row) {
    $client = $row['client'];
    $sql = "UPDATE orders SET client = '$client' WHERE client IS NULL";
    $query = $con->prepare($sql);
    $query->execute();
}

我的问题是，有没有更好的办法？

---

备注：客户端ID是自动增量的

获取插入数据库的最后一个ID：

$sql = "INSERT INTO clients(name) VALUES(?)";
$q = $con->prepare($sql);
$q->execute(array($name)); 

// Assuming you use PDO:
$clientId = $con->lastInsertId();

// For mysqli this would be:
// $clientId = $con->insert_id;


$sql = "INSERT INTO orders(product, client) VALUES(?, ?)";
$q = $con->prepare($sql);
$q->execute(array($product, $clientID)); 

---

获取插入到数据库中的最后一个id：

$sql = "INSERT INTO clients(name) VALUES(?)";
$q = $con->prepare($sql);
$q->execute(array($name)); 

// Assuming you use PDO:
$clientId = $con->lastInsertId();

// For mysqli this would be:
// $clientId = $con->insert_id;


$sql = "INSERT INTO orders(product, client) VALUES(?, ?)";
$q = $con->prepare($sql);
$q->execute(array($product, $clientID));