Xpressengine\Database\DatabaseCoupler::databaseManager PHP Method

    public function databaseManager()
    {
        return $this->databaseManager;
    }

 /**
  * Illuminate\Database\ConnectionResolverInterface
  *
  * @param string $connectionName connection 이름
  * @return void
  */
 public function setDefaultConnection($connectionName)
 {
     $this->coupler->databaseManager()->setDefaultConnection($connectionName);
 }