在laravel中如何从两个不同的数据库检索匹配数据

'connections' => [
    'mysql' => [
        'driver' => 'mysql',
        'host' => env('DB_HOST', '127.0.0.1'),
        'port' => env('DB_PORT', '3306'),
        'database' => env('DB_DATABASE', 'forge'),
        'username' => env('DB_USERNAME', 'forge'),
        'password' => env('DB_PASSWORD', ''),
        'charset' => 'utf8mb4',
        'collation' => 'utf8mb4_unicode_ci',
        'prefix' => '',
        'strict' => true,
        'engine' => null,
    ],

    'second_db' => [
        'driver' => 'mysql',
        'host' => env('SECOND_DB_HOST', '127.0.0.1'),
        'port' => env('SECOND_DB_PORT', '3306'),
        'database' => env('SECOND_DB_DATABASE', 'forge'),
        'username' => env('SECOND_DB_USERNAME', 'forge'),
        'password' => env('SECOND_DB_PASSWORD', ''),
        'charset' => 'utf8mb4',
        'collation' => 'utf8mb4_unicode_ci',
        'prefix' => '',
        'strict' => true,
        'engine' => null,
    ],
],

SECOND_DB_HOST=127.0.0.1
SECOND_DB_PORT=3306
SECOND_DB_DATABASE=second_database
SECOND_DB_USERNAME=root
SECOND_DB_PASSWORD=secret

use Illuminate\Support\Facades\DB;

$users = DB::connection('mysql')->table('users')->get();
$customers = DB::connection('second_db')->table('customers')->get();