superset hana 源码
superset hana 代码
文件路径：/superset/db_engine_specs/hana.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, Optional
from superset.db_engine_specs.base import LimitMethod
from superset.db_engine_specs.postgres import PostgresBaseEngineSpec
from superset.utils import core as utils
class HanaEngineSpec(PostgresBaseEngineSpec):
engine = "hana"
engine_name = "SAP HANA"
limit_method = LimitMethod.WRAP_SQL
force_column_alias_quotes = True
max_column_name_length = 30
_time_grain_expressions = {
None: "{col}",
"PT1S": "TO_TIMESTAMP(SUBSTRING(TO_TIMESTAMP({col}),0,20))",
"PT1M": "TO_TIMESTAMP(SUBSTRING(TO_TIMESTAMP({col}),0,17) || '00')",
"PT1H": "TO_TIMESTAMP(SUBSTRING(TO_TIMESTAMP({col}),0,14) || '00:00')",
"P1D": "TO_DATE({col})",
"P1M": "TO_DATE(SUBSTRING(TO_DATE({col}),0,7)||'-01')",
"P3M": "TO_DATE(SUBSTRING( \
TO_DATE({col}), 0, 5)|| LPAD(CAST((CAST(SUBSTRING(QUARTER( \
TO_DATE({col}), 1), 7, 1) as int)-1)*3 +1 as text),2,'0') ||'-01')",
"P1Y": "TO_DATE(YEAR({col})||'-01-01')",
}
@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.TIMESTAMP:
return f"""TO_TIMESTAMP('{dttm
.isoformat(timespec="microseconds")}', 'YYYY-MM-DD"T"HH24:MI:SS.ff6')"""
return None
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