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1430 lines (1342 loc) · 67.4 KB
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/*
* Copyright (c) 2017 Google Inc.
*
* 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.
*/
using System;
using System.Threading.Tasks;
using Google.Cloud.Spanner.Data;
using CommandLine;
using System.Transactions;
using Microsoft.Practices.EnterpriseLibrary.TransientFaultHandling;
using System.Collections.Generic;
using log4net;
using System.Linq;
using System.Collections.Specialized;
namespace GoogleCloudSamples.Spanner
{
[Verb("createDatabase", HelpText = "Create a Cloud Spanner database in your project.")]
class CreateDatabaseOptions
{
[Value(0, HelpText = "The project ID of the project to use when creating Cloud Spanner resources.", Required = true)]
public string projectId { get; set; }
[Value(1, HelpText = "The ID of the instance where the database will be created.", Required = true)]
public string instanceId { get; set; }
[Value(2, HelpText = "The ID of the database to create.", Required = true)]
public string databaseId { get; set; }
}
[Verb("createSampleDatabase", HelpText = "Create a sample Cloud Spanner database along with sample tables in your project.")]
class CreateSampleDatabaseOptions
{
[Value(0, HelpText = "The project ID of the project to use when creating Cloud Spanner resources.", Required = true)]
public string projectId { get; set; }
[Value(1, HelpText = "The ID of the instance where the sample database will be created.", Required = true)]
public string instanceId { get; set; }
[Value(2, HelpText = "The ID of the sample database to create.", Required = true)]
public string databaseId { get; set; }
}
[Verb("createTable", HelpText = "Create a table in your project's Cloud Spanner database.")]
class CreateTableOptions
{
[Value(0, HelpText = "The project ID of the project to use when creating Cloud Spanner resources.", Required = true)]
public string projectId { get; set; }
[Value(1, HelpText = "The ID of the instance where the table will be created.", Required = true)]
public string instanceId { get; set; }
[Value(2, HelpText = "The ID of the database where the table will be created.", Required = true)]
public string databaseId { get; set; }
[Value(3, HelpText = "The name of the table to create.", Required = true)]
public string tableName { get; set; }
}
[Verb("dropSampleTables", HelpText = "Drops the tables created by createSampleDatabase.")]
class DropSampleTablesOptions
{
[Value(0, HelpText = "The project ID of the project to use when creating Cloud Spanner resources.", Required = true)]
public string projectId { get; set; }
[Value(1, HelpText = "The ID of the instance where the tables will be dropped.", Required = true)]
public string instanceId { get; set; }
[Value(2, HelpText = "The ID of the database where the tables will be dropped.", Required = true)]
public string databaseId { get; set; }
}
[Verb("insertSampleData", HelpText = "Insert sample data into sample Cloud Spanner database table.")]
class InsertSampleDataOptions
{
[Value(0, HelpText = "The project ID of the project to use when managing Cloud Spanner resources.", Required = true)]
public string projectId { get; set; }
[Value(1, HelpText = "The ID of the instance where the sample data will be inserted.", Required = true)]
public string instanceId { get; set; }
[Value(2, HelpText = "The ID of the database where the sample data will be inserted.", Required = true)]
public string databaseId { get; set; }
}
[Verb("deleteSampleData", HelpText = "Delete sample data from sample Cloud Spanner database table.")]
class DeleteSampleDataOptions
{
[Value(0, HelpText = "The project ID of the project to use when managing Cloud Spanner resources.", Required = true)]
public string projectId { get; set; }
[Value(1, HelpText = "The ID of the instance where the sample data will be removed.", Required = true)]
public string instanceId { get; set; }
[Value(2, HelpText = "The ID of the database where the sample data will be removed.", Required = true)]
public string databaseId { get; set; }
}
[Verb("querySampleData", HelpText = "Query sample data from sample Cloud Spanner database table.")]
class QuerySampleDataOptions
{
[Value(0, HelpText = "The project ID of the project to use when managing Cloud Spanner resources.", Required = true)]
public string projectId { get; set; }
[Value(1, HelpText = "The ID of the instance where the sample data resides.", Required = true)]
public string instanceId { get; set; }
[Value(2, HelpText = "The ID of the database where the sample data resides.", Required = true)]
public string databaseId { get; set; }
}
[Verb("addIndex", HelpText = "Add an index to the sample Cloud Spanner database table.")]
class AddIndexOptions
{
[Value(0, HelpText = "The project ID of the project to use when managing Cloud Spanner resources.", Required = true)]
public string projectId { get; set; }
[Value(1, HelpText = "The ID of the instance where the sample data resides.", Required = true)]
public string instanceId { get; set; }
[Value(2, HelpText = "The ID of the database where the sample data resides.", Required = true)]
public string databaseId { get; set; }
}
[Verb("addStoringIndex", HelpText = "Add a storing index to the sample Cloud Spanner database table.")]
class AddStoringIndexOptions
{
[Value(0, HelpText = "The project ID of the project to use when managing Cloud Spanner resources.", Required = true)]
public string projectId { get; set; }
[Value(1, HelpText = "The ID of the instance where the sample data resides.", Required = true)]
public string instanceId { get; set; }
[Value(2, HelpText = "The ID of the database where the sample data resides.", Required = true)]
public string databaseId { get; set; }
}
[Verb("queryDataWithIndex", HelpText = "Query the sample Cloud Spanner database table using an index.")]
class QueryDataWithIndexOptions
{
[Value(0, HelpText = "The project ID of the project to use when managing Cloud Spanner resources.", Required = true)]
public string projectId { get; set; }
[Value(1, HelpText = "The ID of the instance where the sample data resides.", Required = true)]
public string instanceId { get; set; }
[Value(2, HelpText = "The ID of the database where the sample data resides.", Required = true)]
public string databaseId { get; set; }
[Value(3, HelpText = "The start of the title index.", Required = false)]
public string startTitle { get; set; }
[Value(4, HelpText = "The end of the title index.", Required = false)]
public string endTitle { get; set; }
}
[Verb("queryDataWithStoringIndex", HelpText = "Query the sample Cloud Spanner database table using an storing index.")]
class QueryDataWithStoringIndexOptions
{
[Value(0, HelpText = "The project ID of the project to use when managing Cloud Spanner resources.", Required = true)]
public string projectId { get; set; }
[Value(1, HelpText = "The ID of the instance where the sample data resides.", Required = true)]
public string instanceId { get; set; }
[Value(2, HelpText = "The ID of the database where the sample data resides.", Required = true)]
public string databaseId { get; set; }
[Value(3, HelpText = "The start of the title index.", Required = false)]
public string startTitle { get; set; }
[Value(4, HelpText = "The end of the title index.", Required = false)]
public string endTitle { get; set; }
}
[Verb("addColumn", HelpText = "Add a column to the sample Cloud Spanner database table.")]
class AddColumnOptions
{
[Value(0, HelpText = "The project ID of the project to use when managing Cloud Spanner resources.", Required = true)]
public string projectId { get; set; }
[Value(1, HelpText = "The ID of the instance where the sample database resides.", Required = true)]
public string instanceId { get; set; }
[Value(2, HelpText = "The ID of the database where the sample database resides.", Required = true)]
public string databaseId { get; set; }
}
[Verb("writeDataToNewColumn", HelpText = "Write data to a newly added column in the sample Cloud Spanner database table.")]
class WriteDataToNewColumnOptions
{
[Value(0, HelpText = "The project ID of the project to use when managing Cloud Spanner resources.", Required = true)]
public string projectId { get; set; }
[Value(1, HelpText = "The ID of the instance where the sample database resides.", Required = true)]
public string instanceId { get; set; }
[Value(2, HelpText = "The ID of the database where the sample database resides.", Required = true)]
public string databaseId { get; set; }
}
[Verb("queryNewColumn", HelpText = "Query data from a newly added column in the sample Cloud Spanner database table.")]
class QueryNewColumnOptions
{
[Value(0, HelpText = "The project ID of the project to use when managing Cloud Spanner resources.", Required = true)]
public string projectId { get; set; }
[Value(1, HelpText = "The ID of the instance where the sample database resides.", Required = true)]
public string instanceId { get; set; }
[Value(2, HelpText = "The ID of the database where the sample database resides.", Required = true)]
public string databaseId { get; set; }
}
[Verb("queryDataWithTransaction", HelpText = "Query the sample Cloud Spanner database table using a transaction.")]
class QueryDataWithTransactionOptions
{
[Value(0, HelpText = "The project ID of the project to use when managing Cloud Spanner resources.", Required = true)]
public string projectId { get; set; }
[Value(1, HelpText = "The ID of the instance where the sample database resides.", Required = true)]
public string instanceId { get; set; }
[Value(2, HelpText = "The ID of the database where the sample database resides.", Required = true)]
public string databaseId { get; set; }
[Value(3, HelpText = "The platform code to execute. This should be 'netcore' or 'net45' (the default).", Required = false)]
public string platform { get; set; } = "net45";
}
[Verb("readWriteWithTransaction", HelpText = "Update data in the sample Cloud Spanner database table using a read-write transaction.")]
class ReadWriteWithTransactionOptions
{
[Value(0, HelpText = "The project ID of the project to use when managing Cloud Spanner resources.", Required = true)]
public string projectId { get; set; }
[Value(1, HelpText = "The ID of the instance where the sample database resides.", Required = true)]
public string instanceId { get; set; }
[Value(2, HelpText = "The ID of the database where the sample database resides.", Required = true)]
public string databaseId { get; set; }
[Value(3, HelpText = "The platform code to execute. This should be 'netcore' or 'net45' (the default).", Required = false)]
public string platform { get; set; } = "net45";
}
[Verb("readStaleData", HelpText = "Read data that is ten seconds old.")]
class ReadStaleDataOptions
{
[Value(0, HelpText = "The project ID of the project to use when managing Cloud Spanner resources.", Required = true)]
public string projectId { get; set; }
[Value(1, HelpText = "The ID of the instance where the sample database resides.", Required = true)]
public string instanceId { get; set; }
[Value(2, HelpText = "The ID of the database where the sample database resides.", Required = true)]
public string databaseId { get; set; }
}
[Verb("listDatabaseTables", HelpText = "List all the user-defined tables in the database.")]
class ListDatabaseTablesOptions
{
[Value(0, HelpText = "The project ID of the project to use when managing Cloud Spanner resources.", Required = true)]
public string projectId { get; set; }
[Value(1, HelpText = "The ID of the instance where the sample database resides.", Required = true)]
public string instanceId { get; set; }
[Value(2, HelpText = "The ID of the database where the sample database resides.", Required = true)]
public string databaseId { get; set; }
}
public class Program
{
static readonly ILog s_logger = LogManager.GetLogger(typeof(Program));
private static readonly string s_netCorePlatform = "netcore";
enum ExitCode : int
{
Success = 0,
InvalidParameter = 1,
}
// [START insert_data]
public class Singer
{
public int singerId { get; set; }
public string firstName { get; set; }
public string lastName { get; set; }
}
public class Album
{
public int singerId { get; set; }
public int albumId { get; set; }
public string albumTitle { get; set; }
}
// [END insert_data]
public static async Task CreateSampleDatabaseAsync(
string projectId, string instanceId, string databaseId)
{
// [START create_database]
// Initialize request connection string for database creation.
string connectionString =
$"Data Source=projects/{projectId}/instances/{instanceId}";
// Make the request.
using (var connection = new SpannerConnection(connectionString))
{
string createStatement = $"CREATE DATABASE `{databaseId}`";
var cmd = connection.CreateDdlCommand(createStatement);
try
{
await cmd.ExecuteNonQueryAsync();
}
catch (Grpc.Core.RpcException e) when (e.Status.StatusCode == Grpc.Core.StatusCode.AlreadyExists)
{
// OK.
}
}
// Update connection string with Database ID for table creation.
connectionString = connectionString + $"/databases/{databaseId}";
using (var connection = new SpannerConnection(connectionString))
{
// Define create table statement for table #1.
string createTableStatement =
@"CREATE TABLE Singers (
SingerId INT64 NOT NULL,
FirstName STRING(1024),
LastName STRING(1024),
ComposerInfo BYTES(MAX)
) PRIMARY KEY (SingerId)";
// Make the request.
var cmd = connection.CreateDdlCommand(createTableStatement);
await cmd.ExecuteNonQueryAsync();
// Define create table statement for table #2.
createTableStatement =
@"CREATE TABLE Albums (
SingerId INT64 NOT NULL,
AlbumId INT64 NOT NULL,
AlbumTitle STRING(MAX)
) PRIMARY KEY (SingerId, AlbumId),
INTERLEAVE IN PARENT Singers ON DELETE CASCADE";
// Make the request.
cmd = connection.CreateDdlCommand(createTableStatement);
await cmd.ExecuteNonQueryAsync();
}
// [END create_database]
}
public static async Task AddIndexAsync(
string projectId, string instanceId, string databaseId)
{
// [START create_index]
// Initialize request argument(s).
string connectionString =
$"Data Source=projects/{projectId}/instances/"
+ $"{instanceId}/databases/{databaseId}";
string createStatement =
"CREATE INDEX AlbumsByAlbumTitle ON Albums(AlbumTitle)";
// Make the request.
using (var connection = new SpannerConnection(connectionString))
{
var createCmd = connection.CreateDdlCommand(createStatement);
await createCmd.ExecuteNonQueryAsync();
}
Console.WriteLine("Added the AlbumsByAlbumTitle index.");
// [END create_index]
}
public static async Task AddStoringIndexAsync(
string projectId, string instanceId, string databaseId)
{
// [START create_storing_index]
// Initialize request argument(s).
string connectionString =
$"Data Source=projects/{projectId}/instances/"
+ $"{instanceId}/databases/{databaseId}";
string createStatement =
"CREATE INDEX AlbumsByAlbumTitle2 ON Albums(AlbumTitle) "
+ "STORING (MarketingBudget)";
// Make the request.
using (var connection = new SpannerConnection(connectionString))
{
var createCmd = connection.CreateDdlCommand(createStatement);
await createCmd.ExecuteNonQueryAsync();
}
Console.WriteLine("Added the AlbumsByAlbumTitle2 index.");
// [END create_storing_index]
}
public static async Task AddColumnAsync(
string projectId, string instanceId, string databaseId)
{
// [START add_column]
// Initialize request argument(s).
string connectionString =
$"Data Source=projects/{projectId}/instances/"
+ $"{instanceId}/databases/{databaseId}";
string alterStatement =
"ALTER TABLE Albums ADD COLUMN MarketingBudget INT64";
// Make the request.
using (var connection = new SpannerConnection(connectionString))
{
var updateCmd = connection.CreateDdlCommand(alterStatement);
await updateCmd.ExecuteNonQueryAsync();
}
Console.WriteLine("Added the MarketingBudget column.");
// [END add_column]
}
public static async Task QuerySampleDataAsync(
string projectId, string instanceId, string databaseId)
{
// [START query_data]
string connectionString =
$"Data Source=projects/{projectId}/instances/"
+ $"{instanceId}/databases/{databaseId}";
// Create connection to Cloud Spanner.
using (var connection = new SpannerConnection(connectionString))
{
var cmd = connection.CreateSelectCommand(
"SELECT SingerId, AlbumId, AlbumTitle FROM Albums");
using (var reader = await cmd.ExecuteReaderAsync())
{
while (await reader.ReadAsync())
{
Console.WriteLine("SingerId : "
+ reader.GetFieldValue<string>("SingerId")
+ " AlbumId : "
+ reader.GetFieldValue<string>("AlbumId")
+ " AlbumTitle : "
+ reader.GetFieldValue<string>("AlbumTitle"));
}
}
}
// [END query_data]
}
public static async Task QueryDataWithIndexAsync(
string projectId, string instanceId, string databaseId,
string startTitle = "Aardvark", string endTitle = "Goo")
{
// [START query_data_with_index]
// [START read_data_with_index]
string connectionString =
$"Data Source=projects/{projectId}/instances/{instanceId}"
+ $"/databases/{databaseId}";
// Create connection to Cloud Spanner.
using (var connection = new SpannerConnection(connectionString))
{
var cmd = connection.CreateSelectCommand(
"SELECT AlbumId, AlbumTitle, MarketingBudget FROM Albums@ "
+ "{FORCE_INDEX=AlbumsByAlbumTitle} "
+ $"WHERE AlbumTitle >= @startTitle "
+ $"AND AlbumTitle < @endTitle",
new SpannerParameterCollection {
{"startTitle", SpannerDbType.String},
{"endTitle", SpannerDbType.String} });
cmd.Parameters["startTitle"].Value = startTitle;
cmd.Parameters["endTitle"].Value = endTitle;
using (var reader = await cmd.ExecuteReaderAsync())
{
while (await reader.ReadAsync())
{
Console.WriteLine("AlbumId : "
+ reader.GetFieldValue<string>("AlbumId")
+ " AlbumTitle : "
+ reader.GetFieldValue<string>("AlbumTitle")
+ " MarketingBudget : "
+ reader.GetFieldValue<string>("MarketingBudget"));
}
}
}
// [END read_data_with_index]
// [END query_data_with_index]
}
public static async Task QueryDataWithStoringIndexAsync(
string projectId, string instanceId, string databaseId,
string startTitle = "Aardvark", string endTitle = "Goo")
{
// [START read_data_with_storing_index]
string connectionString =
$"Data Source=projects/{projectId}/instances/{instanceId}"
+ $"/databases/{databaseId}";
// Create connection to Cloud Spanner.
using (var connection = new SpannerConnection(connectionString))
{
var cmd = connection.CreateSelectCommand(
"SELECT AlbumId, AlbumTitle, MarketingBudget FROM Albums@ "
+ "{FORCE_INDEX=AlbumsByAlbumTitle2} "
+ $"WHERE AlbumTitle >= @startTitle "
+ $"AND AlbumTitle < @endTitle",
new SpannerParameterCollection {
{"startTitle", SpannerDbType.String},
{"endTitle", SpannerDbType.String} });
cmd.Parameters["startTitle"].Value = startTitle;
cmd.Parameters["endTitle"].Value = endTitle;
using (var reader = await cmd.ExecuteReaderAsync())
{
while (await reader.ReadAsync())
{
Console.WriteLine("AlbumId : "
+ reader.GetFieldValue<string>("AlbumId")
+ " AlbumTitle : "
+ reader.GetFieldValue<string>("AlbumTitle")
+ " MarketingBudget : "
+ reader.GetFieldValue<string>("MarketingBudget"));
}
}
}
// [END read_data_with_storing_index]
}
public static async Task QueryDataWithTransactionCoreAsync(
string projectId, string instanceId, string databaseId)
{
Console.WriteLine(".NetCore API sample.");
// [START read_only_transaction_core]
string connectionString =
$"Data Source=projects/{projectId}/instances/{instanceId}"
+ $"/databases/{databaseId}";
// Create connection to Cloud Spanner.
using (var connection = new SpannerConnection(connectionString))
{
await connection.OpenAsync();
// Open a new read only transaction.
using (var transaction =
await connection.BeginReadOnlyTransactionAsync())
{
var cmd = connection.CreateSelectCommand(
"SELECT SingerId, AlbumId, AlbumTitle FROM Albums");
cmd.Transaction = transaction;
// Read #1.
using (var reader = await cmd.ExecuteReaderAsync())
{
while (await reader.ReadAsync())
{
Console.WriteLine("SingerId : "
+ reader.GetFieldValue<string>("SingerId")
+ " AlbumId : "
+ reader.GetFieldValue<string>("AlbumId")
+ " AlbumTitle : "
+ reader.GetFieldValue<string>("AlbumTitle"));
}
}
// Read #2. Even if changes occur in-between the reads,
// the transaction ensures that Read #1 and Read #2
// return the same data.
using (var reader = await cmd.ExecuteReaderAsync())
{
while (await reader.ReadAsync())
{
Console.WriteLine("SingerId : "
+ reader.GetFieldValue<string>("SingerId")
+ " AlbumId : "
+ reader.GetFieldValue<string>("AlbumId")
+ " AlbumTitle : "
+ reader.GetFieldValue<string>("AlbumTitle"));
}
}
}
}
Console.WriteLine("Transaction complete.");
// [END read_only_transaction_core]
}
public static async Task<object> ReadStaleDataAsync(
string projectId, string instanceId, string databaseId)
{
Console.WriteLine(".NetCore API sample.");
// [START read_stale_data]
string connectionString =
$"Data Source=projects/{projectId}/instances/{instanceId}"
+ $"/databases/{databaseId}";
// Create connection to Cloud Spanner.
using (var connection = new SpannerConnection(connectionString))
{
await connection.OpenAsync();
// Open a new read only transaction.
var staleness = TimestampBound.OfExactStaleness(
TimeSpan.FromSeconds(10));
using (var transaction =
await connection.BeginReadOnlyTransactionAsync(staleness))
{
var cmd = connection.CreateSelectCommand(
"SELECT SingerId, AlbumId, AlbumTitle FROM Albums");
cmd.Transaction = transaction;
using (var reader = await cmd.ExecuteReaderAsync())
{
while (await reader.ReadAsync())
{
Console.WriteLine("SingerId : "
+ reader.GetFieldValue<string>("SingerId")
+ " AlbumId : "
+ reader.GetFieldValue<string>("AlbumId")
+ " AlbumTitle : "
+ reader.GetFieldValue<string>("AlbumTitle"));
}
}
}
}
// [END read_stale_data]
return 0;
}
public static async Task QueryDataWithTransactionAsync(
string projectId, string instanceId, string databaseId)
{
// [START read_only_transaction]
string connectionString =
$"Data Source=projects/{projectId}/instances/{instanceId}"
+ $"/databases/{databaseId}";
// Gets a transaction object that captures the database state
// at a specific point in time.
using (TransactionScope scope = new TransactionScope(
TransactionScopeAsyncFlowOption.Enabled))
{
// Create connection to Cloud Spanner.
using (var connection = new SpannerConnection(connectionString))
{
// Open the connection, making the implicitly created
// transaction read only when it connects to the outer
// transaction scope.
await connection.OpenAsReadOnlyAsync()
.ConfigureAwait(false);
var cmd = connection.CreateSelectCommand(
"SELECT SingerId, AlbumId, AlbumTitle FROM Albums");
// Read #1.
using (var reader = await cmd.ExecuteReaderAsync())
{
while (await reader.ReadAsync())
{
Console.WriteLine("SingerId : "
+ reader.GetFieldValue<string>("SingerId")
+ " AlbumId : "
+ reader.GetFieldValue<string>("AlbumId")
+ " AlbumTitle : "
+ reader.GetFieldValue<string>("AlbumTitle"));
}
}
// Read #2. Even if changes occur in-between the reads,
// the transaction ensures that Read #1 and Read #2
// return the same data.
using (var reader = await cmd.ExecuteReaderAsync())
{
while (await reader.ReadAsync())
{
Console.WriteLine("SingerId : "
+ reader.GetFieldValue<string>("SingerId")
+ " AlbumId : "
+ reader.GetFieldValue<string>("AlbumId")
+ " AlbumTitle : "
+ reader.GetFieldValue<string>("AlbumTitle"));
}
}
}
scope.Complete();
Console.WriteLine("Transaction complete.");
}
// [END read_only_transaction]
}
public static async Task WriteDataToNewColumnAsync(
string projectId, string instanceId, string databaseId)
{
// [START update_data]
string connectionString =
$"Data Source=projects/{projectId}/instances/{instanceId}"
+ $"/databases/{databaseId}";
// Create connection to Cloud Spanner.
using (var connection = new SpannerConnection(connectionString))
{
var cmd = connection.CreateUpdateCommand("Albums",
new SpannerParameterCollection {
{"SingerId", SpannerDbType.Int64},
{"AlbumId", SpannerDbType.Int64},
{"MarketingBudget", SpannerDbType.Int64},
});
var cmdLookup =
connection.CreateSelectCommand("SELECT * FROM Albums");
using (var reader = await cmdLookup.ExecuteReaderAsync())
{
while (await reader.ReadAsync())
{
if (reader.GetFieldValue<int>("SingerId") == 1
&& reader.GetFieldValue<int>("AlbumId") == 1)
{
cmd.Parameters["SingerId"].Value =
reader.GetFieldValue<int>("SingerId");
cmd.Parameters["AlbumId"].Value =
reader.GetFieldValue<int>("AlbumId");
cmd.Parameters["MarketingBudget"].Value = 100000;
await cmd.ExecuteNonQueryAsync();
}
if (reader.GetInt64(0) == 2 && reader.GetInt64(1) == 2)
{
cmd.Parameters["SingerId"].Value =
reader.GetFieldValue<int>("SingerId");
cmd.Parameters["AlbumId"].Value =
reader.GetFieldValue<int>("AlbumId");
cmd.Parameters["MarketingBudget"].Value = 500000;
await cmd.ExecuteNonQueryAsync();
}
}
}
}
Console.WriteLine("Updated data.");
// [END update_data]
}
public static async Task QueryNewColumnAsync(
string projectId, string instanceId, string databaseId)
{
// [START query_data_with_new_column]
string connectionString =
$"Data Source=projects/{projectId}/instances/{instanceId}"
+ $"/databases/{databaseId}";
// Create connection to Cloud Spanner.
using (var connection = new SpannerConnection(connectionString))
{
var cmd =
connection.CreateSelectCommand("SELECT * FROM Albums");
using (var reader = await cmd.ExecuteReaderAsync())
{
while (await reader.ReadAsync())
{
Console.WriteLine("SingerId : "
+ reader.GetFieldValue<string>("SingerId")
+ " AlbumId : "
+ reader.GetFieldValue<string>("AlbumId")
+ " MarketingBudget : "
+ reader.GetFieldValue<string>("MarketingBudget"));
}
}
}
// [END query_data_with_new_column]
}
public static async Task ListDatabaseTablesAsync(
string projectId, string instanceId, string databaseId)
{
// [START list_database_tables]
string connectionString =
$"Data Source=projects/{projectId}/instances/{instanceId}"
+ $"/databases/{databaseId}";
// Create connection to Cloud Spanner.
using (var connection = new SpannerConnection(connectionString))
{
var cmd =
connection.CreateSelectCommand(
"SELECT t.table_name FROM information_schema.tables AS t "
+ "WHERE t.table_catalog = '' and t.table_schema = ''");
using (var reader = await cmd.ExecuteReaderAsync())
{
while (await reader.ReadAsync())
{
Console.WriteLine(
reader.GetFieldValue<string>("table_name"));
}
}
}
// [END list_database_tables]
}
// [START topaz_strategy]
internal class CustomTransientErrorDetectionStrategy
: ITransientErrorDetectionStrategy
{
public bool IsTransient(Exception ex) =>
ex.IsTransientSpannerFault();
}
// [END topaz_strategy]
// [START read_write_transaction_core]
public static async Task ReadWriteWithTransactionCoreAsync(
string projectId,
string instanceId,
string databaseId)
{
// This sample transfers 200,000 from the MarketingBudget
// field of the second Album to the first Album. Make sure to run
// the addColumn and writeDataToNewColumn samples first,
// in that order.
string connectionString =
$"Data Source=projects/{projectId}/instances/{instanceId}"
+ $"/databases/{databaseId}";
decimal transferAmount = 200000;
decimal minimumAmountToTransfer = 300000;
decimal secondBudget = 0;
decimal firstBudget = 0;
Console.WriteLine(".NetCore API sample.");
// Create connection to Cloud Spanner.
using (var connection =
new SpannerConnection(connectionString))
{
await connection.OpenAsync();
// Create a readwrite transaction that we'll assign
// to each SpannerCommand.
using (var transaction =
await connection.BeginTransactionAsync())
{
// Create statement to select the second album's data.
var cmdLookup = connection.CreateSelectCommand(
"SELECT * FROM Albums WHERE SingerId = 2 AND AlbumId = 2");
cmdLookup.Transaction = transaction;
// Excecute the select query.
using (var reader = await cmdLookup.ExecuteReaderAsync())
{
while (await reader.ReadAsync())
{
// Read the second album's budget.
secondBudget =
reader.GetFieldValue<decimal>("MarketingBudget");
// Confirm second Album's budget is sufficient and
// if not raise an exception. Raising an exception
// will automatically roll back the transaction.
if (secondBudget < minimumAmountToTransfer)
{
throw new Exception("The second album's "
+ $"budget {secondBudget} "
+ "is less than the minimum required "
+ "amount to transfer.");
}
}
}
// Read the first album's budget.
cmdLookup = connection.CreateSelectCommand(
"SELECT * FROM Albums WHERE SingerId = 1 and AlbumId = 1");
cmdLookup.Transaction = transaction;
using (var reader = await cmdLookup.ExecuteReaderAsync())
{
while (await reader.ReadAsync())
{
firstBudget =
reader.GetFieldValue<decimal>("MarketingBudget");
}
}
// Specify update command parameters.
var cmd = connection.CreateUpdateCommand("Albums",
new SpannerParameterCollection
{
{"SingerId", SpannerDbType.Int64},
{"AlbumId", SpannerDbType.Int64},
{"MarketingBudget", SpannerDbType.Int64},
});
cmd.Transaction = transaction;
// Update second album to remove the transfer amount.
secondBudget -= transferAmount;
cmd.Parameters["SingerId"].Value = 2;
cmd.Parameters["AlbumId"].Value = 2;
cmd.Parameters["MarketingBudget"].Value = secondBudget;
await cmd.ExecuteNonQueryAsync();
// Update first album to add the transfer amount.
firstBudget += transferAmount;
cmd.Parameters["SingerId"].Value = 1;
cmd.Parameters["AlbumId"].Value = 1;
cmd.Parameters["MarketingBudget"].Value = firstBudget;
await cmd.ExecuteNonQueryAsync();
await transaction.CommitAsync();
}
Console.WriteLine("Transaction complete.");
}
}
// [END read_write_transaction_core]
// [START read_write_transaction]
public static async Task ReadWriteWithTransactionAsync(
string projectId,
string instanceId,
string databaseId)
{
// This sample transfers 200,000 from the MarketingBudget
// field of the second Album to the first Album. Make sure to run
// the addColumn and writeDataToNewColumn samples first,
// in that order.
string connectionString =
$"Data Source=projects/{projectId}/instances/{instanceId}"
+ $"/databases/{databaseId}";
using (TransactionScope scope = new TransactionScope(
TransactionScopeAsyncFlowOption.Enabled))
{
decimal transferAmount = 200000;
decimal minimumAmountToTransfer = 300000;
decimal secondBudget = 0;
decimal firstBudget = 0;
// Create connection to Cloud Spanner.
using (var connection =
new SpannerConnection(connectionString))
{
// Create statement to select the second album's data.
var cmdLookup = connection.CreateSelectCommand(
"SELECT * FROM Albums WHERE SingerId = 2 AND AlbumId = 2");
// Excecute the select query.
using (var reader = await cmdLookup.ExecuteReaderAsync())
{
while (await reader.ReadAsync())
{
// Read the second album's budget.
secondBudget =
reader.GetFieldValue<decimal>("MarketingBudget");
// Confirm second Album's budget is sufficient and
// if not raise an exception. Raising an exception
// will automatically roll back the transaction.
if (secondBudget < minimumAmountToTransfer)
{
throw new Exception("The second album's "
+ $"budget {secondBudget} "
+ "is less than the minimum required "
+ "amount to transfer.");
}
}
}
// Read the first album's budget.
cmdLookup = connection.CreateSelectCommand(
"SELECT * FROM Albums WHERE SingerId = 1 and AlbumId = 1");
using (var reader = await cmdLookup.ExecuteReaderAsync())
{
while (await reader.ReadAsync())
{
firstBudget =
reader.GetFieldValue<decimal>("MarketingBudget");
}
}
// Specify update command parameters.
var cmd = connection.CreateUpdateCommand("Albums",
new SpannerParameterCollection {
{"SingerId", SpannerDbType.Int64},
{"AlbumId", SpannerDbType.Int64},
{"MarketingBudget", SpannerDbType.Int64},
});
// Update second album to remove the transfer amount.
secondBudget -= transferAmount;
cmd.Parameters["SingerId"].Value = 2;
cmd.Parameters["AlbumId"].Value = 2;
cmd.Parameters["MarketingBudget"].Value = secondBudget;
await cmd.ExecuteNonQueryAsync();
// Update first album to add the transfer amount.
firstBudget += transferAmount;
cmd.Parameters["SingerId"].Value = 1;
cmd.Parameters["AlbumId"].Value = 1;
cmd.Parameters["MarketingBudget"].Value = firstBudget;
await cmd.ExecuteNonQueryAsync();
scope.Complete();
Console.WriteLine("Transaction complete.");
}
}
}
// [END read_write_transaction]
public static async Task DeleteSampleDataAsync(
string projectId, string instanceId, string databaseId)
{
const int firstSingerId = 1;
const int secondSingerId = 2;
string connectionString =
$"Data Source=projects/{projectId}/instances/{instanceId}"
+ $"/databases/{databaseId}";
List<Singer> singers = new List<Singer> {
new Singer {singerId = firstSingerId, firstName = "Marc",
lastName = "Richards"},
new Singer {singerId = secondSingerId, firstName = "Catalina",
lastName = "Smith"},
new Singer {singerId = 3, firstName = "Alice",
lastName = "Trentor"},
new Singer {singerId = 4, firstName = "Lea",
lastName = "Martin"},
new Singer {singerId = 5, firstName = "David",
lastName = "Lomond"},
};
// Create connection to Cloud Spanner.
using (var connection = new SpannerConnection(connectionString))
{
await connection.OpenAsync();
// Insert rows into the Singers table.
var cmd = connection.CreateDeleteCommand("Singers",
new SpannerParameterCollection {
{"SingerId", SpannerDbType.Int64}
});
await Task.WhenAll(singers.Select(singer =>
{
cmd.Parameters["SingerId"].Value = singer.singerId;
return cmd.ExecuteNonQueryAsync();
}));
Console.WriteLine("Deleted data.");
}
}
// [START insert_data]
public static async Task InsertSampleDataAsync(
string projectId, string instanceId, string databaseId)
{
const int firstSingerId = 1;
const int secondSingerId = 2;
string connectionString =
$"Data Source=projects/{projectId}/instances/{instanceId}"
+ $"/databases/{databaseId}";
List<Singer> singers = new List<Singer> {
new Singer {singerId = firstSingerId, firstName = "Marc",
lastName = "Richards"},
new Singer {singerId = secondSingerId, firstName = "Catalina",
lastName = "Smith"},
new Singer {singerId = 3, firstName = "Alice",
lastName = "Trentor"},
new Singer {singerId = 4, firstName = "Lea",
lastName = "Martin"},
new Singer {singerId = 5, firstName = "David",
lastName = "Lomond"},