public function Condition::isNull in Drupal 9

Same name and namespace in other branches

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

Sets a condition that the specified field be NULL.

Parameters

string|\Drupal\Core\Database\Query\SelectInterface $field: The name of the field or a subquery to check.

Return value

$this The called object.

Overrides ConditionInterface::isNull

File

core/lib/Drupal/Core/Database/Query/Condition.php, line 147

Class

Condition

Generic class for a series of conditions in a query.

Namespace

Drupal\Core\Database\Query

Code

public function isNull($field) {
  return $this
    ->condition($field, NULL, 'IS NULL');
}