如何在cakephp中使用事务？

use Cake\Datasource\ConnectionManager;

$connection = ConnectionManager::get('default');

$connection->transactional(function ($connection) {
    // 在这里执行需要在事务中执行的代码
});

use Cake\Datasource\ConnectionManager;

class UsersController extends AppController
{
    public function transfer()
    {
        $connection = ConnectionManager::get('default');

        $connection->transactional(function ($connection) {
            try {
                // 开始事务
                $connection->begin();

                // 执行转账操作
                $this->User->updateAll(
                    ['balance' => 'balance - 100'],
                    ['id' => 1]
                );

                $this->User->updateAll(
                    ['balance' => 'balance + 100'],
                    ['id' => 2]
                );

                // 提交事务
                $connection->commit();

                $this->Flash->success('转账成功');
            } catch (\Exception $e) {
                // 回滚事务
                $connection->rollback();

                $this->Flash->error('转账失败');
            }
        });
    }
}