feat: autocommit sample

samples/samples/autocommit.py

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+# Copyright 2020 Google LLC
+#
+# Use of this source code is governed by a BSD-style
+# license that can be found in the LICENSE file or at
+# https://developers.google.com/open-source/licenses/bsd
+
+import argparse
+
+from google.cloud.spanner_dbapi import connect
+
+
+def enable_autocommit_mode(instance_id, database_id):
+    """Enables autocommit mode."""
+    # [START enable_autocommit_mode]
+    connection = connect(instance_id, database_id)
+    connection.autocommit = True
+    print("Autocommit mode is enabled.")
+
+    cursor = connection.cursor()
+
+    cursor.execute(
+        """CREATE TABLE Singers (
+                SingerId     INT64 NOT NULL,
+                FirstName    STRING(1024),
+                LastName     STRING(1024),
+                SingerInfo   BYTES(MAX)
+            ) PRIMARY KEY (SingerId)"""
+    )
+
+    cursor.execute(
+        """INSERT INTO Singers (SingerId, FirstName, LastName) VALUES
+            (12, 'Melissa', 'Garcia'),
+            (13, 'Russell', 'Morales'),
+            (14, 'Jacqueline', 'Long'),
+            (15, 'Dylan', 'Shaw')"""
+    )
+
+    cursor.execute("""SELECT * FROM Singers WHERE SingerId = 13""")
+
+    print(
+        u"SingerId: {}, AlbumId: {}, AlbumTitle: {}".format(*cursor.fetchone())
+    )
+
+    connection.close()
+    # [END enable_autocommit_mode]
+
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser(
+        description=__doc__,
+        formatter_class=argparse.RawDescriptionHelpFormatter,
+    )
+    parser.add_argument("instance_id", help="Your Cloud Spanner instance ID.")
+    parser.add_argument(
+        "--database-id",
+        help="Your Cloud Spanner database ID.",
+        default="example_db",
+    )
+    subparsers = parser.add_subparsers(dest="command")
+    subparsers.add_parser(
+        "enable_autocommit_mode", help=enable_autocommit_mode.__doc__
+    )
+    args = parser.parse_args()
+    if args.command == "enable_autocommit_mode":
+        enable_autocommit_mode(args.instance_id, args.database_id)
+    else:
+        print(
+            "Command {} did not match expected commands.".format(args.command)
+        )

samples/samples/test_autocommit.py

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+# Copyright 2020 Google LLC
+#
+# Use of this source code is governed by a BSD-style
+# license that can be found in the LICENSE file or at
+# https://developers.google.com/open-source/licenses/bsd
+
+import uuid
+
+from google.api_core.exceptions import DeadlineExceeded
+from google.cloud import spanner
+import pytest
+
+import autocommit
+
+
+def unique_instance_id():
+    """Creates a unique id for the database."""
+    return "test-instance-{}".format(uuid.uuid4().hex[:10])
+
+
+def unique_database_id():
+    """Creates a unique id for the database."""
+    return "test-db-{}".format(uuid.uuid4().hex[:10])
+
+
+INSTANCE_ID = unique_instance_id()
+DATABASE_ID = unique_database_id()
+
+
+@pytest.fixture(scope="module")
+def spanner_instance():
+    spanner_client = spanner.Client()
+    instance = spanner_client.instance(INSTANCE_ID)
+    op = instance.create()
+    op.result(120)  # block until completion
+    yield instance
+    instance.delete()
+
+
+@pytest.fixture(scope="module")
+def database(spanner_instance):
+    """Creates a temporary database that is removed after testing."""
+    db = spanner_instance.database(DATABASE_ID)
+    db.create()
+    yield db
+    db.drop()
+
+
+def test_enable_autocommit_mode(capsys):
+    autocommit.enable_autocommit_mode(INSTANCE_ID, DATABASE_ID)
+    out, _ = capsys.readouterr()
+    assert "Autocommit mode is enabled." in out
+    assert "SingerId: 13, AlbumId: Russell, AlbumTitle: Morales" in out