App Engine下载数量有限的实体

Question

我想下载数量有限的应用引擎实体，比方说只有500个。是否可以通过Python bulkloader API来实现？

Answer 1

AFAIK bulkloader API旨在获取给定Kind的所有实体或所有实体。

如果你想下载500个具体的实体，您可以依赖远程API作为this article

Answer 2

调试转变故障描述remotly访问数据存储，而无需下载所有的实体是非常有用的。以下是我对基于1.6.4 SDK的散装加载程序的修改：

 
diff -r 1/google/appengine/tools/appcfg.py 2/google/appengine/tools/appcfg.py 
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>      'limit', 
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>  parser.add_option('--limit', type='int', dest='limit', 
>      action='store', default=None, 
>      help='Number of records to download (for debugging).') 
diff -r 1/google/appengine/tools/bulkloader.py 2/google/appengine/tools/bulkloader.py 
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       throttle_class=None, 
>    limit=None): 
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>  if limit != None: 
>   logger.info("Aborting download after downloading %s entities" % limit) 
>  self.limit_cnt = limit 
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>  if self.limit_cnt and self.limit_cnt <= 0: 
>   logger.info("Reached limit, abort downloading more entities") 
>   return [] 
> 
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>  self.limit_cnt = self.limit_cnt - len(results) 
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     while result_pb.more_results() and self.limit_cnt > 0: 
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>  self.limit = arg_dict['limit'] 
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                 self.throttle_class, 
>               self.limit) 
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      'rps_limit', 'limit') 
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> arg_dict['limit'] = None