-
Notifications
You must be signed in to change notification settings - Fork 1.2k
/
QueryWithArrayAsync.cs
62 lines (56 loc) · 2.31 KB
/
QueryWithArrayAsync.cs
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
// Copyright 2021 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_with_array_parameter]
using Google.Cloud.Spanner.Data;
using System;
using System.Collections.Generic;
using System.Threading.Tasks;
public class QueryWithArrayAsyncSample
{
public class Venue
{
public int VenueId { get; set; }
public string VenueName { get; set; }
public List<DateTime> AvailableDates { get; set; }
}
public async Task<List<Venue>> QueryWithArrayAsync(string projectId, string instanceId, string databaseId)
{
string connectionString = $"Data Source=projects/{projectId}/instances/{instanceId}/databases/{databaseId}";
// Initialize a list of dates to use for querying.
var exampleList = new List<DateTime>
{
DateTime.Parse("2020-10-01"),
DateTime.Parse("2020-11-01")
};
using var connection = new SpannerConnection(connectionString);
var cmd = connection.CreateSelectCommand(
"SELECT VenueId, VenueName, AvailableDate FROM Venues v, "
+ "UNNEST(v.AvailableDates) as AvailableDate "
+ "WHERE AvailableDate in UNNEST(@ExampleArray)");
cmd.Parameters.Add("ExampleArray", SpannerDbType.ArrayOf(SpannerDbType.Date), exampleList);
var venues = new List<Venue>();
using var reader = await cmd.ExecuteReaderAsync();
while (await reader.ReadAsync())
{
venues.Add(new Venue
{
VenueId = reader.GetFieldValue<int>("VenueId"),
VenueName = reader.GetFieldValue<string>("VenueName"),
AvailableDates = new List<DateTime> { reader.GetFieldValue<DateTime>("AvailableDate") }
});
}
return venues;
}
}
// [END spanner_query_with_array_parameter]