OrientDB Gremlin服务器无法在python中工作 [英] OrientDB Gremlin server not working in python

问题描述

我在python中使用orientdb和gremlin服务器，Gremlin服务器已成功启动，但是当我尝试通过gremlin代码向orientdb添加一个顶点时，这给了我一个错误.

I am using the orientdb and gremlin server in python, Gremlin server is started successfully, but when I am trying to add one vertex to the orientdb through gremlin code it's giving me an error.

query = """graph.addVertex(label, "Test", "title", "abc", "title", "abc")"""

以下是回溯

/usr/bin/python3.6 /home/admin-12/Documents/bitbucket/ecodrone/ecodrone/test/test1.py
Traceback (most recent call last):
  File "/home/admin-12/Documents/bitbucket/ecodrone/ecodrone/test/test1.py", line 27, in <module>
    result = execute_query("""graph.addVertex(label, "Test", "title", "abc", "title", "abc")""")
  File "/home/admin-12/Documents/bitbucket/ecodrone/ecodrone/GremlinConnector.py", line 21, in execute_query
    results = future_results.result()
  File "/usr/lib/python3.6/concurrent/futures/_base.py", line 432, in result
    return self.__get_result()
  File "/usr/lib/python3.6/concurrent/futures/_base.py", line 384, in __get_result
    raise self._exception
  File "/home/admin-12/.local/lib/python3.6/site-packages/gremlin_python/driver/resultset.py", line 81, in cb
    f.result()
  File "/usr/lib/python3.6/concurrent/futures/_base.py", line 425, in result
    return self.__get_result()
  File "/usr/lib/python3.6/concurrent/futures/_base.py", line 384, in __get_result
    raise self._exception
  File "/usr/lib/python3.6/concurrent/futures/thread.py", line 56, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/home/admin-12/.local/lib/python3.6/site-packages/gremlin_python/driver/connection.py", line 77, in _receive
    self._protocol.data_received(data, self._results)
  File "/home/admin-12/.local/lib/python3.6/site-packages/gremlin_python/driver/protocol.py", line 106, in data_received
    "{0}: {1}".format(status_code, data["status"]["message"]))
gremlin_python.driver.protocol.GremlinServerError: 599: Error during serialization: Infinite recursion (StackOverflowError) (through reference chain: com.orientechnologies.orient.core.id.ORecordId["record"]->com.orientechnologies.orient.core.record.impl.ODocument["schemaClass"]->com.orientechnologies.orient.core.metadata.schema.OClassImpl["document"]->com.orientechnologies.orient.core.record.impl.ODocument["owners"]->com.orientechnologies.orient.core.record.impl.ODocument["owners"]->com.orientechnologies.orient.core.record.impl.ODocument["owners"]->com.orientechnologies.orient.core.record.impl.ODocument["owners"]->com.orientechnologies.orient.core.record.impl.ODocument["owners"]->com.orientechnologies.orient.core.record.impl.ODocument["owners"]->com.orientechnologies.orient.core.record.impl.ODocument["owners"]->com.orientechnologies.orient.core.record.impl.ODocument["owners"]->com.orientechnologies.orient.core.record.impl.ODocument["owners"]->com.orientechnologies.orient.core.record.impl.ODocument["owners"]->com.orientechnologies.orient.core.record.impl.ODocument["owners"]->com.orientechnologies.orient.core.record.impl.ODocument["owners"]->com.orientechnologies.orient.core.record.impl.ODocument["owners"]->com.orientechnologies.orient.core.record.impl.ODocument["owners"]->com.orientechnologies.orient.core.record.impl.ODocument["owners"]->com.orientechnologies.orient.core.record.impl.ODocument["owners"]->com.orientechnologies.orient.core.record.impl.ODocument["owners"]->com.orientechnologies.orient.core.record.impl.ODocument["owners"]->com.orientechnologies.orient.core.record.impl.ODocument["owners"]->com.orientechnologies.orient.core.record.impl.ODocument["owners"]->com.orientechnologies.orient.core.record.impl.ODocument["owners"]->com.orientechnologies.orient.core.record.impl.ODocument["owners"]->com.orientechnologies.orient.core.record.impl.ODocument["owners"]->com.orientechnologies.orient.core.record.impl.ODocument["owners"]->com.orientechnologies.orient.core.record.impl.ODocument["owners"]->com.orientechnologies.orient.core.record.impl.ODocument["owners"]->com.orientechnologies.orient.core.record.impl.ODocument["owners"]->com.orientechnologies.orient.core.record.impl.ODocument["owners"]->com.orientechnologies.orient.core.record.impl.ODocument["owners"]->com.orientechnologies.orient.core.record.impl.ODocument["owners"]->com.orientechnologies.orient.core.record.impl.ODocument["owners"]->com.orientechnologies.orient.core.record.impl.ODocument["owners"]->com.orientechnologies.orient.core.record.impl.ODocument["owners"]->com.orientechnologies.orient.core.record.impl.ODocument["owners"]->com.orientechnologies.orient.core.record.impl.ODocument["owners"]->com.orientechnologies.orient.core.record.impl.ODocument["owners"])

Process finished with exit code 1

推荐答案

首先，我非常建议您不要使用Graph API进行突变.为此，最好使用遍历API并执行以下操作:

First of all, I very much recommend that you do not use the Graph API to make mutation. Prefer the Traversal API for that and do:

g.addV('Test').
  property('title1', 'abc').
  property('title2', 'abc')

第二，我认为您正在发生错误，因为您返回的是包含ORecordId的Vertex，这是顶点标识符，而Gremlin Server不知道该如何处理.我不知道OrientDB是否已构建处理该问题的序列化程序，但如果这样做，您可能希望

Second, I think that your error is occurring because you are returning a Vertex which contains an ORecordId which is the vertex identifier and Gremlin Server doesn't know how to handle that. I don't know if OrientDB has serializers built to handle that, but if they do then you would want to add them to Gremlin Server configurations which is described in a bit more detail here - basically, you would want to know if OrientDB exposes an TinkerPop IORegistry for all their custom classes that might be sent back over the wire.

如果不这样做，那么您将希望避免返回它们或自己进行转换. TinkerPop已经建议您不要返回完整的Vertex对象，而仅返回所需的数据.因此，您希望将Vertex转换为带有g.V().valueMap('title')或类似名称的Map(也许使用project()步骤)，而不是g.V().如果您确实需要顶点标识符，则需要将其转换为TinkerPop序列化程序可以理解的东西.那可能意味着一些简单的事情:

If they do not, then you would want to avoid returning those or convert them yourself. TinkerPop already recommends that you not return full Vertex objects and only return data that you need. So, rather than g.V() you would want to convert that Vertex into a Map with g.V().valueMap('title') or something similar (perhaps use project() step). If you definitely need the vertex identifier then you would need to convert that to something TinkerPop serializers understand. That might mean something as simple as:

g.V().has("title1","abc").id().next().toString()

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