airflow mssql 源码

airflow mssql 代码

文件路径：/airflow/providers/microsoft/mssql/hooks/mssql.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.
"""Microsoft SQLServer hook module"""
from __future__ import annotations

from typing import Any

import pymssql

from airflow.providers.common.sql.hooks.sql import DbApiHook


class MsSqlHook(DbApiHook):
    """Interact with Microsoft SQL Server."""

    conn_name_attr = 'mssql_conn_id'
    default_conn_name = 'mssql_default'
    conn_type = 'mssql'
    hook_name = 'Microsoft SQL Server'
    supports_autocommit = True
    DEFAULT_SQLALCHEMY_SCHEME = 'mssql+pymssql'

    def __init__(
        self,
        *args,
        sqlalchemy_scheme: str | None = None,
        **kwargs,
    ) -> None:
        """
        :param args: passed to DBApiHook
        :param sqlalchemy_scheme: Scheme sqlalchemy connection.  Default is ``mssql+pymssql`` Only used for
          ``get_sqlalchemy_engine`` and ``get_sqlalchemy_connection`` methods.
        :param kwargs: passed to DbApiHook
        """
        super().__init__(*args, **kwargs)
        self.schema = kwargs.pop("schema", None)
        self._sqlalchemy_scheme = sqlalchemy_scheme

    @property
    def connection_extra_lower(self) -> dict:
        """
        ``connection.extra_dejson`` but where keys are converted to lower case.
        This is used internally for case-insensitive access of mssql params.
        """
        conn = self.get_connection(self.mssql_conn_id)  # type: ignore[attr-defined]
        return {k.lower(): v for k, v in conn.extra_dejson.items()}

    @property
    def sqlalchemy_scheme(self) -> str:
        """Sqlalchemy scheme either from constructor, connection extras or default."""
        return (
            self._sqlalchemy_scheme
            or self.connection_extra_lower.get('sqlalchemy_scheme')
            or self.DEFAULT_SQLALCHEMY_SCHEME
        )

    def get_uri(self) -> str:
        from urllib.parse import parse_qs, urlencode, urlsplit, urlunsplit

        r = list(urlsplit(super().get_uri()))
        # change pymssql driver:
        r[0] = self.sqlalchemy_scheme
        # remove query string 'sqlalchemy_scheme' like parameters:
        qs = parse_qs(r[3], keep_blank_values=True)
        for k in list(qs.keys()):
            if k.lower() == 'sqlalchemy_scheme':
                qs.pop(k, None)
        r[3] = urlencode(qs, doseq=True)
        return urlunsplit(r)

    def get_sqlalchemy_connection(
        self, connect_kwargs: dict | None = None, engine_kwargs: dict | None = None
    ) -> Any:
        """Sqlalchemy connection object"""
        engine = self.get_sqlalchemy_engine(engine_kwargs=engine_kwargs)
        return engine.connect(**(connect_kwargs or {}))

    def get_conn(
        self,
    ) -> pymssql.connect:
        """Returns a mssql connection object"""
        conn = self.get_connection(self.mssql_conn_id)  # type: ignore[attr-defined]

        conn = pymssql.connect(
            server=conn.host,
            user=conn.login,
            password=conn.password,
            database=self.schema or conn.schema,
            port=conn.port,
        )
        return conn

    def set_autocommit(
        self,
        conn: pymssql.connect,
        autocommit: bool,
    ) -> None:
        conn.autocommit(autocommit)

    def get_autocommit(self, conn: pymssql.connect):
        return conn.autocommit_state

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