Sets a condition that the specified field be NULL.

Parameters

$field: The name of the field to check.

Return value

QueryConditionInterface The called object.

Overrides QueryConditionInterface::isNull

File

includes/database/select.inc, line 1075

Class

SelectQuery

Query builder for SELECT statements.

Code

public function isNull($field) {
    $this->where
        ->isNull($field);
    return $this;
}

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