public function QueryConditionInterface::isNull in Drupal 7

Sets a condition that the specified field be NULL.

Parameters

$field: The name of the field to check.

Return value

QueryConditionInterface The called object.

6 methods override QueryConditionInterface::isNull()

DatabaseCondition::isNull in includes/database/query.inc

Implements QueryConditionInterface::isNull().

DeleteQuery::isNull in includes/database/query.inc

Implements QueryConditionInterface::isNull().

MergeQuery::isNull in includes/database/query.inc

Implements QueryConditionInterface::isNull().

SelectQuery::isNull in includes/database/select.inc

Sets a condition that the specified field be NULL.

SelectQueryExtender::isNull in includes/database/select.inc

Sets a condition that the specified field be NULL.

... See full list

File

includes/database/query.inc, line 71

Non-specific Database query code. Used by all engines.

Class

QueryConditionInterface

Interface for a conditional clause in a query.

Code

public function isNull($field);