8000 chore: snapshot isolation sample by surbhigarg92 · Pull Request #1326 · googleapis/python-spanner · GitHub
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chore: 8000 snapshot isolation sample #1326

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chore: snapshot isolation sample #1326

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2 changes: 1 addition & 1 deletion samples/samples/requirements.txt
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Original file line number Diff line number Diff line change
@@ -1,2 +1,2 @@
google-cloud-spanner==3.50.0
google-cloud-spanner==3.53.0
futures==3.4.0; python_version < "3"
39 changes: 39 additions & 0 deletions samples/samples/snippets.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3118,6 +3118,42 @@ def directed_read_options(
print("SingerId: {}, AlbumId: {}, AlbumTitle: {}".format(*row))
# [END spanner_directed_read]

def isolation_level_options(
instance_id,
database_id,
):
from google.cloud.spanner_v1 import TransactionOptions, DefaultTransactionOptions

"""
Shows how to run a Read Write transaction with isolation level options.
"""
# [START spanner_isolation_level]
# instance_id = "your-spanner-instance"
# database_id = "your-spanner-db-id"

isolation_level_options_for_client = TransactionOptions.IsolationLevel.SERIALIZABLE

# The isolation level specified at the client level via default_transaction_options will be applied to all RW transactions
spanner_client = spanner.Client(
default_transaction_options=DefaultTransactionOptions(isolation_level=isolation_level_options_for_client)
)
instance = spanner_client.instance(instance_id)
database = instance.database(database_id)

isolation_level_options_for_request = TransactionOptions.IsolationLevel.REPEATABLE_READ

def insert_singers(transaction):
row_ct = transaction.execute_update(
"INSERT INTO Singers (SingerId, FirstName, LastName) "
" VALUES (20, 'Virginia', 'Watson')"
)

print("{} record(s) inserted.".format(row_ct))

# The isolation level specified at the request level takes precedence over the isolation level configured at the client level.
database.run_in_transaction(insert_singers, isolation_level=isolation_level_options_for_request)
# [END spanner_isolation_level]


def set_custom_timeout_and_retry(instance_id, database_id):
"""Executes a snapshot read with custom timeout and retry."""
Expand Down Expand Up @@ -3651,6 +3687,7 @@ def query_data_with_proto_types_parameter(instance_id, database_id):
)
enable_fine_grained_access_parser.add_argument("--title", default="condition title")
subparsers.add_parser("directed_read_options", help=directed_read_options.__doc__)
subparsers.add_parser("isolation_level_options", help=isolation_level_options.__doc__)
subparsers.add_parser(
"set_custom_timeout_and_retry", help=set_custom_timeout_and_retry.__doc__
)
Expand Down Expand Up @@ -3803,6 +3840,8 @@ def query_data_with_proto_types_parameter(instance_id, database_id):
)
elif args.command == "directed_read_options":
directed_read_options(args.instance_id, args.database_id)
elif args.command == "isolation_level_options":
isolation_level_options(args.instance_id, args.database_id)
elif args.command == "set_custom_timeout_and_retry":
set_custom_timeout_and_retry(args.instance_id, args.database_id)
elif args.command == "create_instance_with_autoscaling_config":
Expand Down
6 changes: 5 additions & 1 deletion samples/samples/snippets_test.py
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Expand Up @@ -961,7 +961,11 @@ def test_directed_read_options(capsys, instance_id, sample_database):
snippets.directed_read_options(instance_id, sample_database.database_id)
out, _ = capsys.readouterr()
assert "SingerId: 1, AlbumId: 1, AlbumTitle: Total Junk" in out


def test_isolated_level_options(capsys, instance_id, sample_database):
snippets.isolation_level_options(instance_id, sample_database.database_id)
out, _ = capsys.readouterr()
assert "1 record(s) inserted." in out

@pytest.mark.dependency(depends=["insert_data"])
def test_set_custom_timeout_and_retry(capsys, instance_id, sample_database):
Expand Down
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