Grails - 保存多个对象，如果保存失败则回滚所有对象 [英] Grails - Saving multiple object, Rollback all object if one fails to save

问题描述

我需要一次保存多个对象，如果一个对象保存失败，则全部回滚.例如:

I need to save multiple object at once, and rollback all if one object fails to save. For example :

class Transaction {
  Item item;
}

class Item {
  date lastTransaction;
}

如果我创建新事务，我需要更改 lastTransaction 值并保存该项目.
如果我保存项目失败，我需要回滚事务(反之亦然).

If I create new Transaction, I need to change lastTransaction value and save the item.
If I failed to save the item, I need to rollback the Transaction (vice versa).

有什么想法吗?

推荐答案

糟糕.不要抛出异常来回滚事务.利用副作用，您将承担相当高的成本，其中事务管理器假设运行时异常意味着您无法控制，会自动滚动为您支持交易，以防止您造成更大的损失.这有点像孤独并用锤子反复敲击自己的头部，所以一些 EMT 和护士或医生可能会花一些时间陪你.

Yuck. Don't throw exceptions to roll back transactions. You're incurring a pretty high cost to take advantage of a side effect where the transaction manager, assuming that a runtime exception means that you're not in control, automatically rolls back the transaction for you to keep you from doing more damage. It's a bit like being lonely and hitting yourself in the head repeatedly with a hammer so some EMTs and perhaps a nurse or a doctor will spend some time with you.

回滚事务很容易，但不幸的是 Grails 没有公开任何这些:

It's pretty easy to roll back a transaction, but unfortunately Grails doesn't expose any of this:

import org.springframework.transaction.interceptor.TransactionAspectSupport

class FooService {

   def someMethod(...) {

      boolean somethingBadHappened = ...
      if (somethingBadHappened) {
         // roll back
         TransactionAspectSupport.currentTransactionStatus().setRollbackOnly()
      }

      // ok, proceed
      ...
   }
}

然后您可以检查当前事务是否已回滚

And later you can check if the current transaction was rolled back with

TransactionAspectSupport.currentTransactionStatus().isRollbackOnly()

请注意，这在控制器中不起作用，因为到那时事务将结束.

Note that this won't work in a controller since the transaction will have ended by that point.

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