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# Copyright 2018 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.

# [START gae_python38_cloud_spanner]

# [START gae_python3_cloud_spanner]

import os

from flask import Flask

from google.cloud import spanner

app = Flask(__name__)

spanner_client = spanner.Client()

instance_id = os.environ.get("SPANNER_INSTANCE")

database_id = os.environ.get("SPANNER_DATABASE")

@app.route("/")

def main():

database = spanner_client.instance(instance_id).database(database_id)

with database.snapshot() as snapshot:

cursor = snapshot.execute_sql("SELECT 1")

results = list(cursor)

return f"Query Result: {results[0][0]}"

# [END gae_python3_cloud_spanner]

# [END gae_python38_cloud_spanner]