superset database 源码
superset database 代码
文件路径：/superset/utils/database.py
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# 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 __future__ import annotations
import logging
from typing import Optional, TYPE_CHECKING
from flask import current_app
from superset.constants import EXAMPLES_DB_UUID
if TYPE_CHECKING:
from superset.connectors.sqla.models import Database
logging.getLogger("MARKDOWN").setLevel(logging.INFO)
logger = logging.getLogger(__name__)
# TODO: duplicate code with DatabaseDao, below function should be moved or use dao
def get_or_create_db(
database_name: str, sqlalchemy_uri: str, always_create: Optional[bool] = True
) -> Database:
# pylint: disable=import-outside-toplevel
from superset import db
from superset.models import core as models
database = (
db.session.query(models.Database).filter_by(database_name=database_name).first()
)
# databases with a fixed UUID
uuids = {
"examples": EXAMPLES_DB_UUID,
}
if not database and always_create:
logger.info("Creating database reference for %s", database_name)
database = models.Database(
database_name=database_name, uuid=uuids.get(database_name)
)
db.session.add(database)
database.set_sqlalchemy_uri(sqlalchemy_uri)
db.session.commit()
# todo: it's a bad idea to do an update in a get/create function
if database and database.sqlalchemy_uri_decrypted != sqlalchemy_uri:
database.set_sqlalchemy_uri(sqlalchemy_uri)
db.session.commit()
return database
def get_example_database() -> Database:
db_uri = (
current_app.config.get("SQLALCHEMY_EXAMPLES_URI")
or current_app.config["SQLALCHEMY_DATABASE_URI"]
)
return get_or_create_db("examples", db_uri)
def get_main_database() -> Database:
db_uri = current_app.config["SQLALCHEMY_DATABASE_URI"]
return get_or_create_db("main", db_uri)
# TODO - the below method used by tests so should move there but should move together
# with above function... think of how to refactor it
def remove_database(database: Database) -> None:
# pylint: disable=import-outside-toplevel
from superset import db
session = db.session
session.delete(database)
session.commit()
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