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query_pagination.py
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query_pagination.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
#
# https://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 query_pagination() -> None:
# [START bigquery_query_pagination]
from google.cloud import bigquery
# Construct a BigQuery client object.
client = bigquery.Client()
query = """
SELECT name, SUM(number) as total_people
FROM `bigquery-public-data.usa_names.usa_1910_2013`
GROUP BY name
ORDER BY total_people DESC
"""
query_job = client.query(query) # Make an API request.
query_job.result() # Wait for the query to complete.
# Get the destination table for the query results.
#
# All queries write to a destination table. If a destination table is not
# specified, the BigQuery populates it with a reference to a temporary
# anonymous table after the query completes.
destination = query_job.destination
# Get the schema (and other properties) for the destination table.
#
# A schema is useful for converting from BigQuery types to Python types.
destination = client.get_table(destination)
# Download rows.
#
# The client library automatically handles pagination.
print("The query data:")
rows = client.list_rows(destination, max_results=20)
for row in rows:
print("name={}, count={}".format(row["name"], row["total_people"]))
# [END bigquery_query_pagination]