How to maintain data type in respond after connecting with Datastax Astra DB? - datastax-astra

Question

I am using Datastax Astra database. I am uploading csv file and I am setting all the columns data type as float, as per column. I connected with my db via python http_method.
res = astra_client.request(
method=http_methods.GET,
path=f"/api/rest/v2/keyspaces/{ASTRA_DB_KEYSPACE}/{ASTRA_DB_COLLECTION}/rows")
This gives me all the rows, but the data type is not maintained in the respond. All the float converted to string. Why and How can I solve this ?
{'PetalWidthCm': '0.2', 'Id': 23, 'PetalLengthCm': '1.0', 'SepalWidthCm': '3.6', 'Species': 'Iris-setosa', 'SepalLengthCm': '4.6'}

Answer 1

How are you creating your table and adding data? For example, the following works for me.
import http.client
import json
ASTRA_TOKEN = ""
ASTRA_DB_ID = ""
ASTRA_DB_REGION = ""
ASTRA_DB_KEYSPACE = "testks"
ASTRA_DB_COLLECTION = "float_test"
conn = http.client.HTTPSConnection(f"{ASTRA_DB_ID}-{ASTRA_DB_REGION}.apps.astra.datastax.com")
headers = {
'X-Cassandra-Token': ASTRA_TOKEN,
'Content-Type': 'application/json'
}
# Create the table
createTablePayload = json.dumps({
"name": f"{ASTRA_DB_COLLECTION}",
"columnDefinitions": [
{"name": "id", "typeDefinition": "text"},
{"name": "floatval", "typeDefinition": "float"},
{"name": "intval", "typeDefinition": "int"},
{"name": "doubleval", "typeDefinition": "double"}
],
"primaryKey": {"partitionKey": ["id"]},
"ifNotExists": True
})
# Add some data
conn.request("POST", f"/api/rest/v2/schemas/keyspaces/{ASTRA_DB_KEYSPACE}/tables", createTablePayload, headers)
res = conn.getresponse()
data = res.read()
print(data.decode("utf-8"))
addRowPayload = json.dumps({
"id": "af2603d2-8c03-11eb-a03f-0ada685e0000",
"floatval": 1.1,
"intval": 2,
"doubleval": 3.3
})
conn.request("POST", f"/api/rest/v2/keyspaces/{ASTRA_DB_KEYSPACE}/{ASTRA_DB_COLLECTION}", addRowPayload, headers)
res = conn.getresponse()
data = res.read()
print(data.decode("utf-8"))
# Read back the data
conn.request("GET", f"/api/rest/v2/keyspaces/{ASTRA_DB_KEYSPACE}/{ASTRA_DB_COLLECTION}/rows", "", headers)
res = conn.getresponse()
data = res.read()
print(data.decode("utf-8"))
The response from this is
$ python3 get_rows.py
{"name":"float_test"}
{"id":"af2603d2-8c03-11eb-a03f-0ada685e0000"}
{"count":1,"data":[{"id":"af2603d2-8c03-11eb-a03f-0ada685e0000","doubleval":3.3,"intval":2,"floatval":1.1}]}