问Cakephp3事务查找查询

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<?php 
namespace App\Controller;

use Cake\Core\Configure;
use Cake\Network\Exception\NotFoundException;
use Cake\View\Exception\MissingTemplateException;

use Cake\Network\Session;
use Cake\Event\Event;

use Cake\Network\Http\Client;
use Cake\ORM\TableRegistry;
use Cake\Datasource\ConnectionManager;

class DashboardController extends AppController {
        public function index(){
            $conn = ConnectionManager::get('default');

            $testModel = TableRegistry::get('Tests');

            $select1=array();
            $select2 = array();
            $saved = array();
            $conn->transactional(function ($connection)use(&$testModel,&$select1,&$select2,&$saved) {
                $select1 = $testModel->find('all')->where(['id' => 2]); // article with id 12

                $select2 = $testModel->get(1);
                $select2->content = 'foo';
                $saved = $testModel->save($select2);
            });
        }

    }
 ?>

BEGIN
SELECT Tests.id AS `Tests__id`, Tests.content AS `Tests__content` FROM tests Tests WHERE id = 2
SELECT Tests.id AS `Tests__id`, Tests.content AS `Tests__content` FROM tests Tests WHERE Tests.id = 1 LIMIT 1
UPDATE tests SET content = 'foo' WHERE id = 1
COMMIT

BEGIN
SELECT Tests.id AS `Tests__id`, Tests.content AS `Tests__content` FROM tests Tests WHERE Tests.id = 1 LIMIT 1
UPDATE tests SET content = 'foo' WHERE id = 1
COMMIT
SELECT Tests.id AS `Tests__id`, Tests.content AS `Tests__content` FROM tests Tests WHERE id = 2