incubator-superset0.99/superset/db_engine_specs/oracle.py

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from datetime import datetime
from typing import Optional

from superset.db_engine_specs.base import LimitMethod
from superset.db_engine_specs.postgres import PostgresBaseEngineSpec


class OracleEngineSpec(PostgresBaseEngineSpec):
    engine = "oracle"
    limit_method = LimitMethod.WRAP_SQL
    force_column_alias_quotes = True
    max_column_name_length = 30

    _time_grain_functions = {
        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')",
        "P0.25Y": "TRUNC(CAST({col} as DATE), 'Q')",
        "P1Y": "TRUNC(CAST({col} as DATE), 'YEAR')",
    }

    @classmethod
    def convert_dttm(cls, target_type: str, dttm: datetime) -> Optional[str]:
        tt = target_type.upper()
        if tt == "DATE":
            return f"TO_DATE('{dttm.date().isoformat()}', 'YYYY-MM-DD')"
        if tt == "TIMESTAMP":
            return f"""TO_TIMESTAMP('{dttm.isoformat(timespec="microseconds")}', 'YYYY-MM-DD"T"HH24:MI:SS.ff6')"""  # pylint: disable=line-too-long
        return None