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.

Implemented by


Expanded class hierarchy of QueryExtendableInterface

Related topics


core/includes/database/, line 19


Contains filters are case sensitive
Name Modifiers Type Descriptionsort descending
QueryExtendableInterface::extend public function Enhance this object by wrapping it in an extender object.