public function generateManyNamed($values, $type = 'string')
    {
        $placeholders = [];
        foreach ($values as $k => $value) {
            $param = $this->placeholder('c');
            $this->_bindings[$param] = [
                'value' => $value,
                'type' => $type,
                'placeholder' => substr($param, 1),
            ];
            $placeholders[$k] = $param;
        }

        return $placeholders;
    }