Doctrine 1.x - Force an ID

sample.php

<?php

$manager = Doctrine_Manager::getInstance();
$connection = $manager->getCurrentConnection();

// BANAL EXAMPLE
$id = 1;
$element = Doctrine::getTable('SampleObject')->find($id);
$element->setId(2);
$connection->unitOfWork->saveGraph($element, true); // If object already exists true, then replace it. Otherwise false to insert a new record.

SampleObject.class.php

<?php

class SampleObject extends Doctrine_Record
{
    public function setId($value)
    {
        $this->_values['id'] = $value;
        $this->_set('id', $value);
    }
}