move create sql to DB class/file

public/index.php

@@ -13,12 +13,10 @@ require __DIR__ . '/../vendor/autoload.php';
 $app = AppFactory::create();
 
 $app->map(['GET', 'POST'], "/orders/{client}/create", function (Request $request, Response $response, array $args) {
+    $db2 = new DB();
+    $client = $args['client'];
+    $a = $db2->getClientInfo($client);
     if ($request->getMethod() == "GET") {
-        $db2 = new DB();
-        $stmt2 = $db2->prepare("SELECT * FROM clients WHERE id = " . $args['client']);
-        $res2 = $stmt2->execute();
-        $a = $res2->fetchArray(SQLITE3_ASSOC);
-
         $response->getBody()->write("<h1>Create order for" . $a['firstname'] . " " . $a['lastname']  . "</h1><hr/>");
         $response->getBody()->write('<form action="/orders/' . $args['client'] . '/create" method="post">');
         $response->getBody()->write('<label for="id">Reference: </label>');

src/DB/DB.php

@@ -10,4 +10,11 @@ class DB extends SQLite3
 	{
 			$this->open('./webshop.db');
 	}
+
+	public function getClientInfo($client) {
+		$stmt2 = $this->prepare("SELECT * FROM clients WHERE id = " . $client);
+    $res2 = $stmt2->execute();
+		$a = $res2->fetchArray(SQLITE3_ASSOC);
+		return $a;
+	}
 }