在eloquent中使用同一个表的多个连接

'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,
    ],
    'mysql2' => [
        'driver' => 'mysql',
        'host' => env('DB_HOST2', '127.0.0.1'),
        'port' => env('DB_PORT2', '3306'),
        'database' => env('DB_DATABASE2', 'forge'),
        'username' => env('DB_USERNAME2', 'forge'),
        'password' => env('DB_PASSWORD2', ''),
        'charset' => 'utf8mb4',
        'collation' => 'utf8mb4_unicode_ci',
        'prefix' => '',
        'strict' => true,
        'engine' => null,
    ],
],

namespace App;

use Illuminate\Database\Eloquent\Model;

class User extends Model
{
    protected $connection = 'mysql'; // 使用默认连接

    // 定义第二个连接
    public function secondConnection()
    {
        $this->setConnection('mysql2');
    }
}

$user = new User;
$user->secondConnection(); // 切换到第二个连接
$users = $user->all(); // 使用第二个连接查询数据