使用nodejs的gcloud数据存储事务问题 [英] gcloud Datastore transaction issue using nodejs

问题描述

我正在使用nodejs联系google数据存储。这是我的代码：

  dataset.runInTransaction（function（transaction，done，err）{
 //从`transaction`对象，像往常一样执行dataset方法
 //当你准备好提交所有的变更时调用`done` 
 
 transaction.save（entities，function（err ）{
 
 
 if（err）{
 console.log（ERROR TRNASCTION）; 
 transaction.rollback（done）; 
 return; 
} else {
 console.log（TRANSACTION SUCCESS！）; 
 done（）; 
} 
 
}）; 
 
 
}）; 
  

如果保存失败，我希望事务回滚，如果是这样，我想要它承诺。我面临的问题是它们都没有运行，只是在控制台上没有输出。没有什么被发送到我的数据库，所以我会至少假设'if（err）'条件会运行，但不会。我对glcoud很陌生，所以我不确定我在这里做错了什么？我正在 https:// / /googlecloudplatform.github.io/gcloud-node/#/docs/v0.26.0/datastore/transaction?method=save 。

解决方案

在一个事务的上下文中， save 方法实际上并不需要回调。你想保存的东西排队等待，直到你调用 done（）。调用 done 将提交事务。然后，您可以在传递给第二个函数的处理操作中处理错误 runInTransaction 。请参阅 https：//googlecloudplatform.github。例如io / gcloud-node /＃/ docs / v0.26.0 / datastore / dataset？method = runInTransaction 。
$ b

-

只要提到这一点，因为它涉及回滚部分： https://github.com/GoogleCloudPlatform/gcloud-node/issues/633 - 在解决该问题之前，我们正在等待升级到Datastore的API。

I am using nodejs to contact the google datastore. This is my code:

dataset.runInTransaction(function(transaction, done,err) {
                    // From the `transaction` object, execute dataset methods as usual.
                    // Call `done` when you're ready to commit all of the changes.

                    transaction.save(entities, function(err) {


                        if(err){
                            console.log("ERROR TRNASCTION");
                            transaction.rollback(done);
                            return;
                        }else{
                            console.log("TRANSACTION SUCCESS!");
                            done();
                        }

                    });


                });

If the save was not successful, I would like the transaction to rollback and if it was I want it to commit. The problem I am facing is that neither of them seem to be running, just no output on the console. Nothing is being sent to my database so I would assume at least the 'if(err)' condition would run but it doesn't. I am new to glcoud so I am not sure if I am doing something wrong here? I am following the doc at https://googlecloudplatform.github.io/gcloud-node/#/docs/v0.26.0/datastore/transaction?method=save.

解决方案

In the context of a transaction, the save method doesn't actually need a callback. The things you wish to save are queued up until you call done(). Calling done will commit the transaction.

You can then handle errors from the commit operation in a second function passed to runInTransaction. See https://googlecloudplatform.github.io/gcloud-node/#/docs/v0.26.0/datastore/dataset?method=runInTransaction for examples of that.

--

Just mentioning this since it relates to the rollback part: https://github.com/GoogleCloudPlatform/gcloud-node/issues/633 -- we're waiting on an upgrade to Datastore's API before tackling that issue.

这篇关于使用nodejs的gcloud数据存储事务问题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！