我在哪里可以使用JDO / Google App Engine设置TransactionOptions？ [英] Where do I set TransactionOptions with JDO / Google App Engine?

问题描述

我使用GAE中的JDO来使用以下方法批量保存对象：

  public void makePersistent（PersistenceManager pm，
 List< Regeling> makePersistent）{
 Transaction tx = pm.currentTransaction（）; 
尝试{
 //开始交易
 tx.begin（）; 
 //坚持数据存储
 // pm.makePersistentAll（makePersistent）; 
 for（int i = 0; i< makePersistent.size（）; i + = BATCH_SIZE）{
 int last = i + BATCH_SIZE; 
 last = last> makePersistent.size（）？ makePersistent.size（）
：last; 
 pm.makePersistentAll（makePersistent.subList（i，last））; 
 pm.flush（）; 
 System.out.println（Made+ last +items persistent。）; 
} 
 //提交事务，将对象刷新到数据存储
 tx.commit（）; 
} catch（Exception e）{
 e.printStackTrace（）; 
} finally {
 if（tx.isActive（））{
 //发生错误以便回滚事务
 System.out.println（回滚事务）; 
 tx.rollback（）; 
} 
 pm.close（）; 
 
 
 $ / code $ / pre 
 $ b $ p 
 $：
 
 
  javax.jdo.JDOUserException：一个或多个实例无法在org.datanucleus.api.jdo.JDOPersistenceManager.makePersistentAll（JDOPersistenceManager。 java：791）
 ... 
 at org.mortbay.thread.QueuedThreadPool $ PoolThread.run（QueuedThreadPool.java:582）
 NestedThrowablesStackTrace：
 
 java。 lang.IllegalArgumentException：需要显式指定跨组事务，请参阅TransactionOptions.Builder.withXGfound都
 
元素{
类型：PersistentServiceResultaat $ RegelingInfoLijst $ Regeling
名称： BWBR0001821
} 
和
 
元素{
类型：PersistentServiceResultaat $ RegelingInfoLijst $ Regeling
名称：BWBR0001822
} 
  
所以我尝试设置这些选项：
  TransactionOptions ops = TransactionOptions.Builder.withXG（true）; 
  
但我找不到一个方法需要 TransactionOptions 对象。在哪里可以设置这些选项？
解决方案
将它设置在 jdoconfig.xml中： 
 
 
 < property name =datanucleus.appengine.datastoreEnableXGTransactionsvalue =true/> 
  
 
I use JDO within GAE to batch persist objects using the following method:
public void makePersistent(PersistenceManager pm,
        List<Regeling> makePersistent) {        
    Transaction tx = pm.currentTransaction(); 
    try {
        // Start the transaction
        tx.begin();
        // Persist to the datastore
        // pm.makePersistentAll(makePersistent);
        for (int i = 0; i < makePersistent.size(); i += BATCH_SIZE) {
            int last = i + BATCH_SIZE;
            last = last > makePersistent.size() ? makePersistent.size()
                    : last;
            pm.makePersistentAll(makePersistent.subList(i, last));
            pm.flush();
            System.out.println("Made "+last+" items persistent.");
        }
        // Commit the transaction, flushing the object to the datastore
        tx.commit();
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        if (tx.isActive()) {
            // Error occurred so rollback the transaction
            System.out.println("Rolling back transaction");
            tx.rollback();
        }
        pm.close();
    }
}
This breaks:
javax.jdo.JDOUserException: One or more instances could not be made persistent
    at org.datanucleus.api.jdo.JDOPersistenceManager.makePersistentAll(JDOPersistenceManager.java:791)
    ...
    at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
NestedThrowablesStackTrace:

java.lang.IllegalArgumentException: cross-group transaction need to be explicitly specified, see TransactionOptions.Builder.withXGfound both

 Element {
  type: "PersistentServiceResultaat$RegelingInfoLijst$Regeling"
  name: "BWBR0001821"
}
 and 

 Element {
  type: "PersistentServiceResultaat$RegelingInfoLijst$Regeling"
  name: "BWBR0001822"
}
So I try to set these options:
TransactionOptions ops = TransactionOptions.Builder.withXG(true);
But I can't find a method that takes a TransactionOptions object. Where can I set these options?
解决方案
Set it in jdoconfig.xml:
<property name="datanucleus.appengine.datastoreEnableXGTransactions" value="true" />


                        
这篇关于我在哪里可以使用JDO / Google App Engine设置TransactionOptions？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！