The reason is Cassandra 2.0 doesn't support writing or requesting blob value, represented as python string. You should use bytearray type instead.
How to query rows by blob primary key from Cassandra using Python's cqlengine
質問
My Cassandra table looks like this:
uid | flwuid | tuuid
------------------------+----------------------------+--------------------------------------
0x50f893bf620d628f0500 | 0x527ce3c3c5ebc4dd7e8b4567 | 1e970c24-488d-11e3-b19a-7054d219d35c
0x505a31a507b8d04b0005 | 0x526a66cbc5ebc4d3708b456c | 6081f230-4797-11e3-b9af-7054d219d35c
0x505a31a507b845000005 | 0x527ce3c3c5ebc4dd7e8b4567 | 9da514bc-4878-11e3-bcb1-7054d219d35c
0x51ee6cef6cbf7679f7a0 | 0x524bfd0dc5ebc486738b4567 | 6bdf89c6-4b93-11e3-a8a0-7054d219d35c
0x51ee160a6cbf7679f7a0 | 0x526a7149c5ebc494708b456c | 8e8a1c4c-45fe-11e3-9b35-7054d219d35c
I have a cqlengine model:
class Followers(Model):
uid = cqlengine.Bytes(primary_key=True)
flwuid = cqlengine.Bytes(primary_key=True)
tuuid = cqlengine.TimeUUID()
To get all rows with uid
= 0x50f893bf620d628f0500
I am trying to do this:
Followers.objects(uid='0x50f893bf620d628f0500')
but getting an exception:
CQLEngineException: Bad Request: Invalid STRING constant (3078353066383933626636323064363238663035303030303061) for uid of type blob
How can specify correct blob value for cqlengine' query?
Cassandra 2.0.1, cqlengine 0.9.1.
Thanks in advance.
解決
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