superset bart_lines 源码
superset bart_lines 代码
文件路径：/superset/examples/bart_lines.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.
import json
import pandas as pd
import polyline
from sqlalchemy import inspect, String, Text
from superset import db
from ..utils.database import get_example_database
from .helpers import get_example_url, get_table_connector_registry
def load_bart_lines(only_metadata: bool = False, force: bool = False) -> None:
tbl_name = "bart_lines"
database = get_example_database()
engine = database.get_sqla_engine()
schema = inspect(engine).default_schema_name
table_exists = database.has_table_by_name(tbl_name)
if not only_metadata and (not table_exists or force):
url = get_example_url("bart-lines.json.gz")
df = pd.read_json(url, encoding="latin-1", compression="gzip")
df["path_json"] = df.path.map(json.dumps)
df["polyline"] = df.path.map(polyline.encode)
del df["path"]
df.to_sql(
tbl_name,
engine,
schema=schema,
if_exists="replace",
chunksize=500,
dtype={
"color": String(255),
"name": String(255),
"polyline": Text,
"path_json": Text,
},
index=False,
)
print("Creating table {} reference".format(tbl_name))
table = get_table_connector_registry()
tbl = db.session.query(table).filter_by(table_name=tbl_name).first()
if not tbl:
tbl = table(table_name=tbl_name, schema=schema)
tbl.description = "BART lines"
tbl.database = database
tbl.filter_select_enabled = True
db.session.merge(tbl)
db.session.commit()
tbl.fetch_metadata()
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