mirror of
https://github.com/taosdata/TDengine
synced 2026-05-24 10:09:01 +00:00
49 lines
2.4 KiB
Python
49 lines
2.4 KiB
Python
from dotenv import load_dotenv
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load_dotenv() # read .env file from current working directory
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# ANCHOR: connect
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import taosrest
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import os
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url = os.environ["TDENGINE_CLOUD_URL"]
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token = os.environ["TDENGINE_CLOUD_TOKEN"]
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conn = taosrest.connect(url=url, token=token)
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# test the connection by getting version info
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print("server version:", conn.server_info)
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# ANCHOR_END: connect
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# ANCHOR: basic
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from taosrest import TaosRestCursor
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# create STable
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cursor: TaosRestCursor = conn.cursor()
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cursor.execute("DROP DATABASE IF EXISTS power")
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cursor.execute("CREATE DATABASE power")
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cursor.execute("CREATE STABLE power.meters (ts TIMESTAMP, current FLOAT, voltage INT, phase FLOAT) TAGS (location BINARY(64), groupId INT)")
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# insert data
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cursor.execute("""INSERT INTO power.d1001 USING power.meters TAGS(California.SanFrancisco, 2) VALUES ('2018-10-03 14:38:05.000', 10.30000, 219, 0.31000) ('2018-10-03 14:38:15.000', 12.60000, 218, 0.33000) ('2018-10-03 14:38:16.800', 12.30000, 221, 0.31000)
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power.d1002 USING power.meters TAGS(California.SanFrancisco, 3) VALUES ('2018-10-03 14:38:16.650', 10.30000, 218, 0.25000)
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power.d1003 USING power.meters TAGS(California.LosAngeles, 2) VALUES ('2018-10-03 14:38:05.500', 11.80000, 221, 0.28000) ('2018-10-03 14:38:16.600', 13.40000, 223, 0.29000)
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power.d1004 USING power.meters TAGS(California.LosAngeles, 3) VALUES ('2018-10-03 14:38:05.000', 10.80000, 223, 0.29000) ('2018-10-03 14:38:06.500', 11.50000, 221, 0.35000)""")
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print("inserted row count:", cursor.rowcount)
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# query data
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cursor.execute("SELECT * FROM power.meters LIMIT 3")
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# get total rows
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print("queried row count:", cursor.rowcount)
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# get column names from cursor
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column_names = [meta[0] for meta in cursor.description]
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# get rows
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data: list[tuple] = cursor.fetchall()
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print(column_names)
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for row in data:
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print(row)
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# output:
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# inserted row count: 8
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# queried row count: 3
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# ['ts', 'current', 'voltage', 'phase', 'location', 'groupid']
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# [datetime.datetime(2018, 10, 3, 14, 38, 5, 500000, tzinfo=datetime.timezone(datetime.timedelta(seconds=28800), '+08:00')), 11.8, 221, 0.28, 'california.losangeles', 2]
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# [datetime.datetime(2018, 10, 3, 14, 38, 16, 600000, tzinfo=datetime.timezone(datetime.timedelta(seconds=28800), '+08:00')), 13.4, 223, 0.29, 'california.losangeles', 2]
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# [datetime.datetime(2018, 10, 3, 14, 38, 5, tzinfo=datetime.timezone(datetime.timedelta(seconds=28800), '+08:00')), 10.8, 223, 0.29, 'california.losangeles', 3]
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# ANCHOR_END: basic
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