[Bug]: create collection through pymilvus, no error raised but collection list is still empty

[zydmtaichi]

Is there an existing issue for this?

• I have searched the existing issues

Environment

- Milvus version:2.4.1
- Deployment mode(standalone or cluster):standalone
- MQ type(rocksmq, pulsar or kafka):    
- SDK version(e.g. pymilvus v2.0.0rc2):2.4.4
- OS(Ubuntu or CentOS): windows
- CPU/Memory: 
- GPU: 
- Others:

Current Behavior

I connect to milvus db using python SDK ,then create db and collection, the db creation is good but collection can't be created.
my example is pasted below:

from pymilvus import connections, MilvusClient, db, FieldSchema, DataType, CollectionSchema, Collection

conn = connections.connect(host="127.0.0.1", port=19530)

#newdatabase = db.create_database("llamatest")

client = MilvusClient(uri="http://127.0.0.1:19530")

db.using_database("llamatest")

res = db.list_database()

print(res)

my_id = FieldSchema(name="id", dtype=DataType.INT64, is_primary=True, description="this is id")
my_vec = FieldSchema(name="vec", dtype=DataType.FLOAT_VECTOR, dim=128, description="embed vec")

fields = [my_id, my_vec]

schema = CollectionSchema(fields=fields, auto_id=False, enable_dynamic_id=True, description="test collection")

my_collection = Collection(name="coll_test", schema=schema, using="default")

res2 = client.list_collections()

print(res2)

This example raise nothing,but the res2 which represents the collections existed is still printed as a empty list.

Expected Behavior

No response

Steps To Reproduce

No response

Milvus Log

No response

Anything else?

No response

[yanliang567]

@zydmtaichi checking the code above, you are using 2 connections: conn and client. The working database of conn is llamatest as you called using_database, while the working database of client is default. So try to call utility.list_collection(). BTW, I think you don't need the client connection at all.
/assign @zydmtaichi
/unassign

[xiaofan-luan]

you seem to mix use two style of apis

when you create collection
my_collection = Collection(name="coll_test", schema=schema, using="default")

you actaully create a colleciton under default databse, not the database you created.

this is the right API

client.create_collection(
collection_name="customized_setup_1",
schema=schema,
index_params=index_params
)

https://milvus.io/docs/manage-collections.md

[zydmtaichi]

@zydmtaichi checking the code above, you are using 2 connections: conn and client. The working database of conn is llamatest as you called using_database, while the working database of client is default. So try to call utility.list_collection(). BTW, I think you don't need the client connection at all. /assign @zydmtaichi /unassign

yeah,your point is correct,i switch to utility and it shows the collection name as i want

[zydmtaichi]

you seem to mix use two style of apis

when you create collection my_collection = Collection(name="coll_test", schema=schema, using="default")

you actaully create a colleciton under default databse, not the database you created.

this is the right API

client.create_collection( collection_name="customized_setup_1", schema=schema, index_params=index_params )

https://milvus.io/docs/manage-collections.md

"default" is a aliase of connection(per doc),i just want to create a collection under the db "llamatest", but using="llamatest" is not worked, what should i do

[yanliang567]

MilvusClient and utility are two different styles of python sdk for milvus. if you want to use MilvusClient, you can call

client.using_database(db_name= llamatest)
client.list_collections()

[yanliang567]

more info about MilvusClient: https://milvus.io/api-reference/pymilvus/v2.4.x/MilvusClient/Client/MilvusClient.md