| # 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. |
| import re |
| from datetime import datetime |
| from typing import List, Optional, Tuple |
| |
| from sqlalchemy.engine.interfaces import Dialect |
| from sqlalchemy.types import String, TypeEngine, UnicodeText |
| |
| from superset.db_engine_specs.base import BaseEngineSpec, LimitMethod |
| |
| |
| class MssqlEngineSpec(BaseEngineSpec): |
| engine = "mssql" |
| limit_method = LimitMethod.WRAP_SQL |
| max_column_name_length = 128 |
| |
| _time_grain_functions = { |
| None: "{col}", |
| "PT1S": "DATEADD(second, DATEDIFF(second, '2000-01-01', {col}), '2000-01-01')", |
| "PT1M": "DATEADD(minute, DATEDIFF(minute, 0, {col}), 0)", |
| "PT5M": "DATEADD(minute, DATEDIFF(minute, 0, {col}) / 5 * 5, 0)", |
| "PT10M": "DATEADD(minute, DATEDIFF(minute, 0, {col}) / 10 * 10, 0)", |
| "PT15M": "DATEADD(minute, DATEDIFF(minute, 0, {col}) / 15 * 15, 0)", |
| "PT0.5H": "DATEADD(minute, DATEDIFF(minute, 0, {col}) / 30 * 30, 0)", |
| "PT1H": "DATEADD(hour, DATEDIFF(hour, 0, {col}), 0)", |
| "P1D": "DATEADD(day, DATEDIFF(day, 0, {col}), 0)", |
| "P1W": "DATEADD(week, DATEDIFF(week, 0, {col}), 0)", |
| "P1M": "DATEADD(month, DATEDIFF(month, 0, {col}), 0)", |
| "P0.25Y": "DATEADD(quarter, DATEDIFF(quarter, 0, {col}), 0)", |
| "P1Y": "DATEADD(year, DATEDIFF(year, 0, {col}), 0)", |
| } |
| |
| @classmethod |
| def epoch_to_dttm(cls): |
| return "dateadd(S, {col}, '1970-01-01')" |
| |
| @classmethod |
| def convert_dttm(cls, target_type: str, dttm: datetime) -> str: |
| return "CONVERT(DATETIME, '{}', 126)".format(dttm.isoformat()) |
| |
| @classmethod |
| def fetch_data(cls, cursor, limit: int) -> List[Tuple]: |
| data = super().fetch_data(cursor, limit) |
| if data and type(data[0]).__name__ == "Row": |
| data = [tuple(row) for row in data] |
| return data |
| |
| column_types = [ |
| (String(), re.compile(r"^(?<!N)((VAR){0,1}CHAR|TEXT|STRING)", re.IGNORECASE)), |
| (UnicodeText(), re.compile(r"^N((VAR){0,1}CHAR|TEXT)", re.IGNORECASE)), |
| ] |
| |
| @classmethod |
| def get_sqla_column_type(cls, type_: str) -> Optional[TypeEngine]: |
| for sqla_type, regex in cls.column_types: |
| if regex.match(type_): |
| return sqla_type |
| return None |
| |
| @classmethod |
| def column_datatype_to_string( |
| cls, sqla_column_type: TypeEngine, dialect: Dialect |
| ) -> str: |
| datatype = super().column_datatype_to_string(sqla_column_type, dialect) |
| # MSSQL returns long overflowing datatype |
| # as in 'VARCHAR(255) COLLATE SQL_LATIN1_GENERAL_CP1_CI_AS' |
| # and we don't need the verbose collation type |
| str_cutoff = " COLLATE " |
| if str_cutoff in datatype: |
| datatype = datatype.split(str_cutoff)[0] |
| return datatype |