Php 如何关闭laravel 5.4中的持久连接

我正在使用laravel和oracle开发应用程序，其中我正在使用laravel oci8的持久连接 我使用下面的代码设置app/config/database.php

 'oracle' => array(
            'driver'   => 'oracle',
            'tns'      => env('DB_TNS', '(DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))) (CONNECT_DATA = (SERVICE_NAME = orcl)))'),
            'host'     => env('DB_HOST', 'localhost'),
            'port'     => env('DB_PORT', '1521'),
            'database' => env('DB_DATABASE', 'Test_DB'),
            'username' => env('DB_USERNAME', 'admin'),
            'password' => env('DB_PASSWORD', 'admin'),
            'charset'  => env('DB_CHARSET', 'AL32UTF8'),
            'prefix'   => env('DB_PREFIX', ''),
            'options' => [
                \PDO::ATTR_PERSISTENT => true
            ]

        )

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问题是，当新用户登录到系统时，我想重新创建数据库连接。我将如何关闭laravel的连接。如果需要关闭连接，请帮助我

\DB::disconnect();

\DB::purge('oracle');
\Config::set('database.default', 'oracle_the_new');
\DB::connection('oracle_the_new');

$user  = new User();
$user->setConnection('oracle_the_new');
$user1 = $user->find(1);

如果你只需要重新连接

\DB::reconnect();

但如果你需要改变连接

\DB::disconnect();

\DB::purge('oracle');
\Config::set('database.default', 'oracle_the_new');
\DB::connection('oracle_the_new');

$user  = new User();
$user->setConnection('oracle_the_new');
$user1 = $user->find(1);

注意：如果不更改database.default，laravel将始终重新连接默认连接。或者您可以更改模型的连接

\DB::disconnect();

\DB::purge('oracle');
\Config::set('database.default', 'oracle_the_new');
\DB::connection('oracle_the_new');

$user  = new User();
$user->setConnection('oracle_the_new');
$user1 = $user->find(1);

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will\DB:：disconnect（）；关闭持久连接，但当脚本执行数据库查询时，laravel将重新连接。