Nextras\Orm\Mapper\Dbal\QueryBuilderHelper::getSqlOperator PHP Метод

    protected function getSqlOperator($value, $operator)
    {
        if ($operator === ConditionParserHelper::OPERATOR_EQUAL) {
            if (is_array($value)) {
                $operator = ' IN ';
                return $operator;
            } elseif ($value === null) {
                $operator = ' IS ';
                return $operator;
            } else {
                $operator = ' = ';
                return $operator;
            }
        } elseif ($operator === ConditionParserHelper::OPERATOR_NOT_EQUAL) {
            if (is_array($value)) {
                $operator = ' NOT IN ';
                return $operator;
            } elseif ($value === null) {
                $operator = ' IS NOT ';
                return $operator;
            } else {
                $operator = ' != ';
                return $operator;
            }
        } else {
            $operator = " {$operator} ";
            return $operator;
        }
    }