forked from googleapis/python-bigquery-storage
/
read_query_results.py
47 lines (41 loc) · 1.49 KB
/
read_query_results.py
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# Copyright 2019 Google LLC
#
# Licensed 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.
def read_query_results():
# [START bigquerystorage_pandas_tutorial_read_query_results]
from google.cloud import bigquery
bqclient = bigquery.Client()
# Download query results.
query_string = """
SELECT
CONCAT(
'https://stackoverflow.com/questions/',
CAST(id as STRING)) as url,
view_count
FROM `bigquery-public-data.stackoverflow.posts_questions`
WHERE tags like '%google-bigquery%'
ORDER BY view_count DESC
"""
dataframe = (
bqclient.query(query_string)
.result()
.to_dataframe(
# Optionally, explicitly request to use the BigQuery Storage API. As of
# google-cloud-bigquery version 1.26.0 and above, the BigQuery Storage
# API is used by default.
create_bqstorage_client=True,
)
)
print(dataframe.head())
# [END bigquerystorage_pandas_tutorial_read_query_results]
return dataframe