superset oracle 源码
superset oracle 代码
文件路径：/superset/db_engine_specs/oracle.py
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
from datetime import datetime
from typing import Any, Dict, List, Optional, Tuple
from superset.db_engine_specs.base import BaseEngineSpec, LimitMethod
from superset.utils import core as utils
class OracleEngineSpec(BaseEngineSpec):
engine = "oracle"
engine_name = "Oracle"
limit_method = LimitMethod.WRAP_SQL
force_column_alias_quotes = True
max_column_name_length = 30
_time_grain_expressions = {
None: "{col}",
"PT1S": "CAST({col} as DATE)",
"PT1M": "TRUNC(CAST({col} as DATE), 'MI')",
"PT1H": "TRUNC(CAST({col} as DATE), 'HH')",
"P1D": "TRUNC(CAST({col} as DATE), 'DDD')",
"P1W": "TRUNC(CAST({col} as DATE), 'WW')",
"P1M": "TRUNC(CAST({col} as DATE), 'MONTH')",
"P3M": "TRUNC(CAST({col} as DATE), 'Q')",
"P1Y": "TRUNC(CAST({col} as DATE), 'YEAR')",
}
@classmethod
def convert_dttm(
cls, target_type: str, dttm: datetime, db_extra: Optional[Dict[str, Any]] = None
) -> Optional[str]:
tt = target_type.upper()
if tt == utils.TemporalType.DATE:
return f"TO_DATE('{dttm.date().isoformat()}', 'YYYY-MM-DD')"
if tt == utils.TemporalType.DATETIME:
datetime_formatted = dttm.isoformat(timespec="seconds")
return f"""TO_DATE('{datetime_formatted}', 'YYYY-MM-DD"T"HH24:MI:SS')"""
if tt == utils.TemporalType.TIMESTAMP:
return f"""TO_TIMESTAMP('{dttm
.isoformat(timespec="microseconds")}', 'YYYY-MM-DD"T"HH24:MI:SS.ff6')"""
return None
@classmethod
def epoch_to_dttm(cls) -> str:
return "TO_DATE('1970-01-01','YYYY-MM-DD')+(1/24/60/60)*{col}"
@classmethod
def epoch_ms_to_dttm(cls) -> str:
return "TO_DATE('1970-01-01','YYYY-MM-DD')+(1/24/60/60/1000)*{col}"
@classmethod
def fetch_data(
cls, cursor: Any, limit: Optional[int] = None
) -> List[Tuple[Any, ...]]:
"""
:param cursor: Cursor instance
:param limit: Maximum number of rows to be returned by the cursor
:return: Result of query
"""
if not cursor.description:
return []
return super().fetch_data(cursor, limit)
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