如何在迁移到HRD后恢复Blob [英] How can i recover Blobs after migration to HRD

问题描述

 从servlet未捕获到的异常
 java.lang.SecurityException：此应用程序无权访问该Blob。 
 at com.google.appengine.api.blobstore.BlobstoreServiceImpl.fetchData（BlobstoreServiceImpl.java:200）
 at com.droidastic.telljokes.server.servlet.ServeBlobsServlet.checkBlobKeyExists（ServeBlobsServlet.java:100） 
 at com.droidastic.telljokes.server.servlet.ServeBlobsServlet.doGet（ServeBlobsServlet.java:64）
  

我将这些键作为字符串存储在数据存储实体中，然后我将它们创建为这样：

  BlobKey key =新的BlobKey（this.params.blobKey）; 
  

如何恢复斑点？

解决方案

我找到了一个解决方案：

  public String getMigratedBlobKey（String oldKey）{
 String migrationEntityKey =__BlobMigration__; 
 Key createKey = KeyFactory.createKey（migrationEntityKey，oldKey）; 
实体migrationEntity = datastore.get（createKey）; 
 BlobKey newKey =（BlobKey）migrationEntity.getProperty（new_blob_key）; 
返回newKey.getKeyString（）; 
} 
 
__BlobMigration__和new_blob_key是GAE常数。 
  

I just migrated to HRD and now its telling me i cant access my own blobs...

Uncaught exception from servlet
java.lang.SecurityException: This application does not have access to that blob.
at com.google.appengine.api.blobstore.BlobstoreServiceImpl.fetchData(BlobstoreServiceImpl.java:200)
at com.droidastic.telljokes.server.servlet.ServeBlobsServlet.checkBlobKeyExists(ServeBlobsServlet.java:100)
at com.droidastic.telljokes.server.servlet.ServeBlobsServlet.doGet(ServeBlobsServlet.java:64)

I stored the keys as a string inside the datastore entities and then i create them like this:

BlobKey key = new BlobKey(this.params.blobKey); 

How can i recover the blobs?

解决方案

I found a solution:

public String getMigratedBlobKey(String oldKey) {
  String migrationEntityKey = "__BlobMigration__";
  Key createKey = KeyFactory.createKey(migrationEntityKey, oldKey);
  Entity migrationEntity = datastore.get(createKey);
  BlobKey newKey = (BlobKey) migrationEntity.getProperty("new_blob_key");
  return newKey.getKeyString();
}

"__BlobMigration__" and "new_blob_key" are GAE constants.

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