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();
}