public Query::__sleep()
Implements the magic __sleep function to disconnect from the database.
public function __sleep() { $keys = get_object_vars($this); unset($keys['connection']); return array_keys($keys); }
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Database!Query!Query.php/function/Query::__sleep/8.1.x