superset db2 源码
superset db2 代码
文件路径：/superset/db_engine_specs/db2.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 superset.db_engine_specs.base import BaseEngineSpec, LimitMethod
class Db2EngineSpec(BaseEngineSpec):
engine = "db2"
engine_aliases = {"ibm_db_sa"}
engine_name = "IBM Db2"
limit_method = LimitMethod.WRAP_SQL
force_column_alias_quotes = True
max_column_name_length = 30
_time_grain_expressions = {
None: "{col}",
"PT1S": "CAST({col} as TIMESTAMP)" " - MICROSECOND({col}) MICROSECONDS",
"PT1M": "CAST({col} as TIMESTAMP)"
" - SECOND({col}) SECONDS"
" - MICROSECOND({col}) MICROSECONDS",
"PT1H": "CAST({col} as TIMESTAMP)"
" - MINUTE({col}) MINUTES"
" - SECOND({col}) SECONDS"
" - MICROSECOND({col}) MICROSECONDS ",
"P1D": "CAST({col} as TIMESTAMP)"
" - HOUR({col}) HOURS"
" - MINUTE({col}) MINUTES"
" - SECOND({col}) SECONDS"
" - MICROSECOND({col}) MICROSECONDS",
"P1W": "{col} - (DAYOFWEEK({col})) DAYS",
"P1M": "{col} - (DAY({col})-1) DAYS",
"P3M": "{col} - (DAY({col})-1) DAYS"
" - (MONTH({col})-1) MONTHS"
" + ((QUARTER({col})-1) * 3) MONTHS",
"P1Y": "{col} - (DAY({col})-1) DAYS" " - (MONTH({col})-1) MONTHS",
}
@classmethod
def epoch_to_dttm(cls) -> str:
return "(TIMESTAMP('1970-01-01', '00:00:00') + {col} SECONDS)"
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