function PagerSelectExtender::execute

Override the execute method.

Before we run the query, we need to add pager-based range() instructions to it.

Overrides SelectExtender::execute

File

core/lib/Drupal/Core/Database/Query/PagerSelectExtender.php, line 62

Class

PagerSelectExtender

Query extender for pager queries.

Namespace

Code

public function execute() {
  // By calling preExecute() here, we force it to preprocess the extender
  // object rather than just the base query object. That means
  // hook_query_alter() gets access to the extended object.
  if (!$this->preExecute($this)) {
    return NULL;
  }
  // A NULL limit is the "kill switch" for pager queries.
  if (empty($this->limit)) {
    return;
  }
  $this->ensureElement();
  $total_items = $this->getCountQuery()
    ->execute()
    ->fetchField();
  $pager = $this->connection
    ->getPagerManager()
    ->createPager($total_items, $this->limit, $this->element);
  $this->range($pager->getCurrentPage() * $this->limit, $this->limit);
  // Now that we've added our pager-based range instructions, run the query normally.
  return $this->query
    ->execute();
}