interface ExtendableInterface in Drupal 9

Interface for extendable query objects.

"Extenders" follow the "Decorator" OOP design pattern. That is, they wrap and "decorate" another object. In our case, they implement the same interface as select queries and wrap a select query, to which they delegate almost all operations. Subclasses of this class may implement additional methods or override existing methods as appropriate. Extenders may also wrap other extender objects, allowing for arbitrarily complex "enhanced" queries.

Hierarchy

• interface \Drupal\Core\Database\Query\ExtendableInterface

File

core/lib/Drupal/Core/Database/Query/ExtendableInterface.php, line 15

Namespace

Drupal\Core\Database\Query

interface ExtendableInterface {

  /**
   * Enhance this object by wrapping it in an extender object.
   *
   * @param $extender_name
   *   The fully-qualified name of the extender class, without the leading '\'
   *   (for example, Drupal\my_module\myExtenderClass). The extender name will
   *   be checked against the current database connection to allow
   *   driver-specific subclasses as well, using the same logic as the query
   *   objects themselves.
   *
   * @return \Drupal\Core\Database\Query\ExtendableInterface
   *   The extender object, which now contains a reference to this object.
   */
  public function extend($extender_name);

}

Members

Name	Modifiers	Type	Description	Overrides
ExtendableInterface::extend	public	function	Enhance this object by wrapping it in an extender object.	2