public function BookOutlineStorage::getBooks in Drupal 9

Same name and namespace in other branches

1. 8 core/modules/book/src/BookOutlineStorage.php \Drupal\book\BookOutlineStorage::getBooks()
2. 10 core/modules/book/src/BookOutlineStorage.php \Drupal\book\BookOutlineStorage::getBooks()

Gets books (the highest positioned book links).

Return value

array An array of book IDs.

Overrides BookOutlineStorageInterface::getBooks

File

core/modules/book/src/BookOutlineStorage.php, line 29

Class

BookOutlineStorage

Defines a storage class for books outline.

Namespace

Drupal\book

Code

public function getBooks() {
  return $this->connection
    ->query("SELECT DISTINCT([bid]) FROM {book}")
    ->fetchCol();
}