标签: pyorient

我想将> 1mn记录的MySQL数据库转换为图形数据库,因为它是重度链接的网络类型数据.Neo4J的免费版本有一些我认为可能会遇到的限制,因此我安装了OrientDB(Community 2.2.0)(在Ubuntu Server 16.04上)并使其正常运行.现在我需要从Python(3.5.1+)访问它,所以我正在尝试pyorient(1.5.2).(我尝试使用TinkerPop,因为我最终想要使用Gremlin,并且无法让gremlin控制台与OrientDB交谈.)

以下简单的Python代码,用于连接到OrientDB中的一个测试图:

import pyorient

username="user"
password="password"

client = pyorient.OrientDB("localhost", 2424)
session_id = client.connect( username, password )

print("SessionID=",session_id)

db_name="GratefulDeadConcerts"

if client.db_exists( db_name, pyorient.STORAGE_TYPE_MEMORY ):
    print("Database",db_name,"exists")
    client.db_open( db_name, username, password )
else:
    print("Database",db_name,"doesn't exist")

给出了一个奇怪的错误:

SessionID= 27
Database GratefulDeadConcerts exists
Traceback (most recent call last):
  File "FirstTest.py", line 18, in <module>
    client.db_open( db_name, username, password )
  File "/home/tom/MyProgs/TestingPyOrient/env/lib/python3.5/site-packages/pyorient/orient.py", line 379, in db_open
    .prepare((db_name, user, password, db_type, client_id)).send().fetch_response()
  File "/home/tom/MyProgs/TestingPyOrient/env/lib/python3.5/site-packages/pyorient/messages/database.py", line 141, in fetch_response
    info = OrientVersion(release)
  File "/home/tom/MyProgs/TestingPyOrient/env/lib/python3.5/site-packages/pyorient/otypes.py", …

我正在尝试使用pyorient驱动程序创建类,但有时如果类存在,我有类存在消息.有没有办法检查OrientDB python驱动程序中是否存在类？以下是我创建类的示例代码的一部分......

@classmethod
def create(cls):

    cls._cluster_id = OrientEngine.client.command("CREATE CLASS %s EXTENDS V" % cls.__name__)
    return cls._cluster_id

我正在尝试使用Oriented DB提取记录pyorient,这是我的查询:

query =  "SELECT value FROM (SELECT expand(Elements) FROM dataset) WHERE type = 'XXX'"
records = client.command(query)

一切都很好.当我尝试打印记录时,我得到的是:

record = records[0]
print type(record)
<class 'pyorient.otypes.OrientRecord'>


print record
{{'value': 'Name'},'version':0,'rid':'#-2:0'}

因为我只需要提取' Name' record,我试过:

print record[0]

得到了

TypeError: 'OrientRecord' object does not support indexing

这是以下结果repr:

print(repr(record))
<pyorient.otypes.OrientRecord object at 0x7fdcdb531ad0>