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，并且如果一个对象无法保存则全部回滚。
例如：

  class Transaction {
 Item item; 
} 
 
 class物品{
 date lastTransaction; 
 
 
 
 
 
 $ b如果我创建新的事务，我需要更改lastTransaction值并保存项目。 
 
 
如果我没有保存该项目，我需要回滚交易（反之亦然）。
 
 
 
有什么想法吗？ p> 
 
解决方案
 Yuck。不要抛出异常来回滚事务。如果事务管理器假设运行时异常意味着您不在控制之下，并且自动执行滚动操作，那么使用 副作用 支持你的交易以防止你受到更多的伤害。这有点像寂寞，用锤子反复敲打头部，所以一些EMT，也许护士或医生会花一些时间陪你。
 
 
 
这很漂亮很容易回滚一个事务，但不幸的是Grails并没有公开这些内容： 
 
 
  import org.springframework.transaction.interceptor .TransactionAspectSupport 
 $ b class FooService {
 
 def someMethod（...）{
 
 boolean somethingBadHappened = ... 
 if（somethingBadHappened ）{
 //回滚
 TransactionAspectSupport.currentTransactionStatus（）。setRollbackOnly（）
} 
 
 //继续
 ... 
 
 
 $ / code> 
稍后您可以检查当前事务是否回滚
  TransactionAspectSupport.currentTransactionStatus（）。isRollbackOnly（）
  
请注意，这不适用于一个控制者，因为交易将以该点结束。
 
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;
}
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).

Any ideas?
解决方案
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.

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
      ...
   }
}
And later you can check if the current transaction was rolled back with
TransactionAspectSupport.currentTransactionStatus().isRollbackOnly()
Note that this won't work in a controller since the transaction will have ended by that point.

                        
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