/
QueryDataWithTimestampColumnAsync.cs
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/
QueryDataWithTimestampColumnAsync.cs
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// Copyright 2020 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.
// [START spanner_query_data_with_timestamp_column]
using Google.Cloud.Spanner.Data;
using System;
using System.Collections.Generic;
using System.Threading.Tasks;
public class QueryDataWithTimestampColumnAsyncSample
{
public class Album
{
public int SingerId { get; set; }
public int AlbumId { get; set; }
public DateTime? LastUpdateTime { get; set; }
public long? MarketingBudget { get; set; }
}
public async Task<List<Album>> QueryDataWithTimestampColumnAsync(string projectId, string instanceId, string databaseId)
{
string connectionString = $"Data Source=projects/{projectId}/instances/{instanceId}/databases/{databaseId}";
using var connection = new SpannerConnection(connectionString);
using var cmd = connection.CreateSelectCommand("SELECT SingerId, AlbumId, MarketingBudget, LastUpdateTime FROM Albums ORDER BY LastUpdateTime DESC");
var albums = new List<Album>();
using var reader = await cmd.ExecuteReaderAsync();
while (await reader.ReadAsync())
{
albums.Add(new Album
{
SingerId = reader.GetFieldValue<int>("SingerId"),
AlbumId = reader.GetFieldValue<int>("AlbumId"),
LastUpdateTime = reader.IsDBNull(reader.GetOrdinal("LastUpdateTime")) ? (DateTime?)null : reader.GetFieldValue<DateTime>("LastUpdateTime"),
MarketingBudget = reader.IsDBNull(reader.GetOrdinal("MarketingBudget")) ? 0 : reader.GetFieldValue<long>("MarketingBudget")
});
}
return albums;
}
}
// [END spanner_query_data_with_timestamp_column]