doctrine-orm - 在 Doctrine 2 中进行嵌套查询的主页？

Question

我想用 Doctrine 2 来做这个：

SELECT *, 
 (SELECT action FROM operations_history
         WHERE timesheet.id = operations_history.timesheet_id
         ORDER BY operations_history.created DESC 
          LIMIT 1) as status 
FROM timesheet; 

有什么帮助吗？如果可能的话，我想这样做createQueryBuilder();。谢谢。