Add veneer samples for BigQuery. [(googleapis#444)](GoogleCloudPlatform/python-docs-samples#444)

Put them in their own directory, since they duplicate the content from
the existing samples that use the generated libraries.

Author: tswast

samples/snippets/README.md

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+# BigQuery Google Cloud Client Library Samples
+
+<!-- auto-doc-link -->
+<!-- end-auto-doc-link -->
+

samples/snippets/async_query.py

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+#!/usr/bin/env python
+
+# Copyright 2016 Google Inc. All Rights Reserved.
+#
+# 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.
+
+"""Command-line application to perform asynchronous queries in BigQuery.
+
+For more information, see the README.md under /bigquery.
+
+Example invocation:
+    $ python async_query.py \
+          'SELECT corpus FROM `publicdata.samples.shakespeare` GROUP BY corpus'
+"""
+
+import argparse
+import time
+import uuid
+
+from gcloud import bigquery
+
+
+def async_query(query):
+    client = bigquery.Client()
+    query_job = client.run_async_query(str(uuid.uuid4()), query)
+    query_job.use_legacy_sql = False
+    query_job.begin()
+
+    wait_for_job(query_job)
+
+    # Manually construct the QueryResults.
+    # TODO: The client library will provide a helper method that does this.
+    # https://github.com/GoogleCloudPlatform/gcloud-python/issues/2083
+    query_results = bigquery.query.QueryResults('', client)
+    query_results._properties['jobReference'] = {
+        'jobId': query_job.name,
+        'projectId': query_job.project
+    }
+
+    # Drain the query results by requesting a page at a time.
+    page_token = None
+
+    while True:
+        rows, total_rows, page_token = query_results.fetch_data(
+            max_results=10,
+            page_token=page_token)
+
+        for row in rows:
+            print(row)
+
+        if not page_token:
+            break
+
+
+def wait_for_job(job):
+    while True:
+        job.reload()  # Refreshes the state via a GET request.
+        if job.state == 'DONE':
+            if job.error_result:
+                raise RuntimeError(job.error_result)
+            return
+        time.sleep(1)
+
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser(
+        description=__doc__,
+        formatter_class=argparse.RawDescriptionHelpFormatter)
+    parser.add_argument('query', help='BigQuery SQL Query.')
+
+    args = parser.parse_args()
+
+    async_query(args.query)

samples/snippets/async_query_test.py

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+# Copyright 2016 Google Inc. All Rights Reserved.
+#
+# 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.
+
+from async_query import async_query
+
+
+def test_async_query(cloud_config, capsys):
+    query = (
+        'SELECT corpus FROM `publicdata.samples.shakespeare` '
+        'GROUP BY corpus;')
+
+    async_query(query)
+
+    out, _ = capsys.readouterr()
+
+    assert 'romeoandjuliet' in out

samples/snippets/requirements.txt

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+gcloud==0.18.1

samples/snippets/sync_query.py

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+#!/usr/bin/env python
+
+# Copyright 2016 Google Inc. All Rights Reserved.
+#
+# 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.
+
+"""Command-line application to perform synchronous queries in BigQuery.
+
+For more information, see the README.md under /bigquery.
+
+Example invocation:
+    $ python sync_query.py \
+          'SELECT corpus FROM `publicdata.samples.shakespeare` GROUP BY corpus'
+"""
+
+import argparse
+
+# [START sync_query]
+from gcloud import bigquery
+
+
+def sync_query(query):
+    client = bigquery.Client()
+    query_results = client.run_sync_query(query)
+
+    # Use standard SQL syntax for queries.
+    # See: https://cloud.google.com/bigquery/sql-reference/
+    query_results.use_legacy_sql = False
+
+    query_results.run()
+
+    # Drain the query results by requesting a page at a time.
+    page_token = None
+
+    while True:
+        rows, total_rows, page_token = query_results.fetch_data(
+            max_results=10,
+            page_token=page_token)
+
+        for row in rows:
+            print(row)
+
+        if not page_token:
+            break
+# [END sync_query]
+
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser(
+        description=__doc__,
+        formatter_class=argparse.RawDescriptionHelpFormatter)
+    parser.add_argument('query', help='BigQuery SQL Query.')
+
+    args = parser.parse_args()
+
+    sync_query(args.query)

samples/snippets/sync_query_test.py

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+# Copyright 2016 Google Inc. All Rights Reserved.
+#
+# 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.
+
+from sync_query import sync_query
+
+
+def test_sync_query(cloud_config, capsys):
+    query = (
+        'SELECT corpus FROM `publicdata.samples.shakespeare` '
+        'GROUP BY corpus;')
+
+    sync_query(query)
+
+    out, _ = capsys.readouterr()
+
+    assert 'romeoandjuliet' in out