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75 lines
2.5 KiB
Python
75 lines
2.5 KiB
Python
# Licensed to the Apache Software Foundation (ASF) under one
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# or more contributor license agreements. See the NOTICE file
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# distributed with this work for additional information
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# regarding copyright ownership. The ASF licenses this file
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# to you under the Apache License, Version 2.0 (the
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# "License"); you may not use this file except in compliance
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# with the License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing,
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# software distributed under the License is distributed on an
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# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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# KIND, either express or implied. See the License for the
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# specific language governing permissions and limitations
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# under the License.
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from __future__ import annotations
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from typing import Any
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from urllib import parse
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from sqlalchemy.engine.url import make_url, URL # noqa: F401
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from superset.db_engine_specs.base import BaseEngineSpec, DatabaseCategory
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class TDengineEngineSpec(BaseEngineSpec):
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engine = "taosws"
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engine_name = "TDengine"
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max_column_name_length = 64
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default_driver = "taosws"
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sqlalchemy_uri_placeholder = (
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"taosws://user:******@host:port/dbname[?key=value&key=value...]"
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)
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metadata = {
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"description": "TDengine is a high-performance time-series database for IoT.",
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"logo": "tdengine.png",
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"homepage_url": "https://tdengine.com/",
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"categories": [DatabaseCategory.TIME_SERIES, DatabaseCategory.OPEN_SOURCE],
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"pypi_packages": ["taospy", "taos-ws-py"],
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"connection_string": "taosws://{user}:{password}@{host}:{port}",
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"default_port": 6041,
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"connection_examples": [
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{
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"description": "Local connection",
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"connection_string": "taosws://root:taosdata@127.0.0.1:6041",
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},
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],
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"docs_url": "https://www.tdengine.com",
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}
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# time grain
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_time_grain_expressions = {
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None: "{col}",
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"PT1S": "TIMETRUNCATE({col}, 1s, 0)",
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"PT1M": "TIMETRUNCATE({col}, 1m, 0)",
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"PT1H": "TIMETRUNCATE({col}, 1h, 0)",
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"P1D": "TIMETRUNCATE({col}, 1d, 0)",
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"P1W": "TIMETRUNCATE({col}, 1w, 0)",
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}
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@classmethod
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def get_schema_from_engine_params(
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cls,
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sqlalchemy_uri: URL,
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connect_args: dict[str, Any],
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) -> str | None:
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"""
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Return the configured schema.
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A TDengine database is a SQLAlchemy schema.
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"""
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return parse.unquote(sqlalchemy_uri.database)
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