lumen框架实例化mysql pdo对象

$databaseConfig = config("database.connections.mysql");
try {
    //底层已经做了重连机制
    $pdo = (new ConnectionFactory(app()))->createConnector($databaseConfig)->connect($databaseConfig);
    return $pdo;
} catch (\PDOException $e) {
    return $e->getMessage();
} catch (\Exception $e) {
    return $e->getMessage();
}