46 lines
2.3 KiB
Python
46 lines
2.3 KiB
Python
# ANCHOR: connect
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from taosrest import connect, TaosRestConnection, TaosRestCursor
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conn: TaosRestConnection = connect(host="localhost",
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user="root",
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password="taosdata",
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port=6041,
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timeout=30)
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# ANCHOR_END: connect
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# ANCHOR: basic
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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(Beijing.Chaoyang, 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(Beijing.Chaoyang, 3) VALUES ('2018-10-03 14:38:16.650', 10.30000, 218, 0.25000)
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power.d1003 USING power.meters TAGS(Beijing.Haidian, 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(Beijing.Haidian, 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, tzinfo=datetime.timezone(datetime.timedelta(seconds=28800), '+08:00')), 10.3, 219, 0.31, 'beijing.chaoyang', 2]
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# [datetime.datetime(2018, 10, 3, 14, 38, 15, tzinfo=datetime.timezone(datetime.timedelta(seconds=28800), '+08:00')), 12.6, 218, 0.33, 'beijing.chaoyang', 2]
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# [datetime.datetime(2018, 10, 3, 14, 38, 16, 800000, tzinfo=datetime.timezone(datetime.timedelta(seconds=28800), '+08:00')), 12.3, 221, 0.31, 'beijing.chaoyang', 2]
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# ANCHOR_END: basic
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