public function SelectInterface::getUnion in Drupal 9

Same name and namespace in other branches

1. 8 core/lib/Drupal/Core/Database/Query/SelectInterface.php \Drupal\Core\Database\Query\SelectInterface::getUnion()
2. 10 core/lib/Drupal/Core/Database/Query/SelectInterface.php \Drupal\Core\Database\Query\SelectInterface::getUnion()

Returns a reference to the union queries for this query. This include queries for UNION, UNION ALL, and UNION DISTINCT.

Because this method returns by reference, alter hooks may edit the tables array directly to make their changes. If just adding union queries, however, the use of the union() method is preferred.

Note that this method must be called by reference as well:

$fields =& $query
  ->getUnion();

Return value

A reference to the union query array structure.

2 methods override SelectInterface::getUnion()

Select::getUnion in core/lib/Drupal/Core/Database/Query/Select.php

Returns a reference to the union queries for this query. This include queries for UNION, UNION ALL, and UNION DISTINCT.

SelectExtender::getUnion in core/lib/Drupal/Core/Database/Query/SelectExtender.php

Returns a reference to the union queries for this query. This include queries for UNION, UNION ALL, and UNION DISTINCT.

File

core/lib/Drupal/Core/Database/Query/SelectInterface.php, line 123

Class

SelectInterface

Interface definition for a Select Query object.

Namespace

Drupal\Core\Database\Query

Code

public function &getUnion();