'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', ''),
    // 其他配置...
],

'mysql_second' => [
    'driver' => 'mysql',
    'host' => env('DB_SECOND_HOST', '127.0.0.1'),
    'port' => env('DB_SECOND_PORT', '3306'),
    'database' => env('DB_SECOND_DATABASE', 'second_db'),
    'username' => env('DB_SECOND_USERNAME', 'second_user'),
    'password' => env('DB_SECOND_PASSWORD', ''),
    'charset' => 'utf8mb4',
    'collation' => 'utf8mb4_unicode_ci',
    'prefix' => '',
    'strict' => true,
    'engine' => null,
],

DB_SECOND_HOST=127.0.0.1
DB_SECOND_PORT=3306
DB_SECOND_DATABASE=your_second_db
DB_SECOND_USERNAME=your_second_user
DB_SECOND_PASSWORD=your_password

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class SecondDbUser extends Model
{
    protected $connection = 'mysql_second'; // 对应 config/database.php 中的连接名
    protected $table = 'users';
}

use Illuminate\Support\Facades\DB;

// 使用默认连接
$users = DB::table('users')->get();

// 使用第二个数据库连接
$secondUsers = DB::connection('mysql_second')->table('users')->get();

DB::connection('mysql_second')->transaction(function () {
    DB::connection('mysql_second')->table('users')->update(['active' => 1]);
});

$dynamicConnection = $tenant->isPremium ? 'mysql_premium' : 'mysql_default';

$users = DB::connection($dynamicConnection)->table('users')->get();