72 lines
2.0 KiB
Python
72 lines
2.0 KiB
Python
import taosws
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dsn = "taosws://root:taosdata@localhost:6041"
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conn = taosws.connect(dsn)
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db = "power"
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conn.execute(f"DROP DATABASE IF EXISTS {db}")
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conn.execute(f"CREATE DATABASE {db}")
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# change database.
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conn.execute(f"USE {db}")
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# create super table
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conn.execute(
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"CREATE STABLE power.meters (ts TIMESTAMP, current FLOAT, voltage INT, phase FLOAT) TAGS (location BINARY(64), groupId INT)"
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)
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# ANCHOR: insert
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# ws insert data
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sql = """
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INSERT INTO
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power.d1001 USING power.meters TAGS('California.SanFrancisco', 2)
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VALUES ('2018-10-03 14:38:05.000', 10.30000, 219, 0.31000)
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('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)
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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)
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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)
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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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"""
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inserted = conn.execute(sql)
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assert inserted == 8
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# ANCHOR_END: insert
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# ANCHOR: query
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# Execute a sql and get its result set. It's useful for SELECT statement
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result = conn.query("SELECT * from meters")
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# Get fields from result
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fields = result.fields
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for field in fields:
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print(field)
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"""
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output:
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{name: ts, type: TIMESTAMP, bytes: 8}
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{name: current, type: FLOAT, bytes: 4}
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{name: voltage, type: INT, bytes: 4}
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{name: phase, type: FLOAT, bytes: 4}
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{name: location, type: BINARY, bytes: 64}
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{name: groupid, type: INT, bytes: 4}
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"""
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# Get rows from result
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for row in result:
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print(row)
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"""
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output:
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('2018-10-03 14:38:05 +08:00', 10.300000190734863, 219, 0.3100000023841858, 'California.SanFrancisco', 2)
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...
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"""
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# ANCHOR_END: query
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# ANCHOR: req_id
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result = conn.query_with_req_id("SELECT * from meters", req_id=1)
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# ANCHOR_END: req_id
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conn.close()
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