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Program.cs
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Program.cs
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// Copyright(c) 2018 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 CommandLine;
using Google.Cloud.Firestore;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Threading.Tasks;
namespace GoogleCloudSamples
{
public class PaginateData
{
public static string Usage = @"Usage:
C:\> dotnet run command YOUR_PROJECT_ID
Where command is one of
start-at-field-query-cursor
end-at-field-query-cursor
document-snapshot-cursor
paginated-query-cursor
multiple-cursor-conditions
";
private static async Task StartAtFieldQueryCursor(string project)
{
FirestoreDb db = FirestoreDb.Create(project);
CollectionReference citiesRef = db.Collection("cities");
// [START firestore_query_cursor_start_at_field_value_single]
Query query = citiesRef.OrderBy("Population").StartAt(1000000);
// [END firestore_query_cursor_start_at_field_value_single]
QuerySnapshot querySnapshot = await query.GetSnapshotAsync();
foreach (DocumentSnapshot documentSnapshot in querySnapshot.Documents)
{
Console.WriteLine("Document {0} returned by start at population 1000000 field query cursor", documentSnapshot.Id);
}
}
private static async Task EndAtFieldQueryCursor(string project)
{
FirestoreDb db = FirestoreDb.Create(project);
CollectionReference citiesRef = db.Collection("cities");
// [START firestore_query_cursor_end_at_field_value_single]
Query query = citiesRef.OrderBy("Population").EndAt(1000000);
// [END firestore_query_cursor_end_at_field_value_single]
QuerySnapshot querySnapshot = await query.GetSnapshotAsync();
foreach (DocumentSnapshot documentSnapshot in querySnapshot.Documents)
{
Console.WriteLine("Document {0} returned by end at population 1000000 field query cursor", documentSnapshot.Id);
}
}
private static async Task DocumentSnapshotCursor(string project)
{
FirestoreDb db = FirestoreDb.Create(project);
// [START firestore_query_cursor_start_at_document]
CollectionReference citiesRef = db.Collection("cities");
DocumentReference docRef = citiesRef.Document("SF");
DocumentSnapshot snapshot = await docRef.GetSnapshotAsync();
Query query = citiesRef.OrderBy("Population").StartAt(snapshot);
// [END firestore_query_cursor_start_at_document]
QuerySnapshot querySnapshot = await query.GetSnapshotAsync();
foreach (DocumentSnapshot documentSnapshot in querySnapshot.Documents)
{
Console.WriteLine("Document {0} returned by query for cities with population greater than or equal to SF.", documentSnapshot.Id);
}
}
private static async Task PaginatedQueryCursor(string project)
{
FirestoreDb db = FirestoreDb.Create(project);
// [START firestore_query_cursor_pagination]
CollectionReference citiesRef = db.Collection("cities");
Query firstQuery = citiesRef.OrderBy("Population").Limit(3);
// Get the last document from the results
QuerySnapshot querySnapshot = await firstQuery.GetSnapshotAsync();
long lastPopulation = 0;
foreach (DocumentSnapshot documentSnapshot in querySnapshot.Documents)
{
lastPopulation = documentSnapshot.GetValue<long>("Population");
}
// Construct a new query starting at this document.
// Note: this will not have the desired effect if multiple cities have the exact same population value
Query secondQuery = citiesRef.OrderBy("Population").StartAfter(lastPopulation);
QuerySnapshot secondQuerySnapshot = await secondQuery.GetSnapshotAsync();
// [END firestore_query_cursor_pagination]
foreach (DocumentSnapshot documentSnapshot in secondQuerySnapshot.Documents)
{
Console.WriteLine("Document {0} returned by paginated query cursor.", documentSnapshot.Id);
}
}
private static async Task MultipleCursorConditions(string project)
{
FirestoreDb db = FirestoreDb.Create(project);
// [START firestore_query_cursor_start_at_field_value_multi]
Query query1 = db.Collection("cities").OrderBy("Name").OrderBy("State").StartAt("Springfield");
Query query2 = db.Collection("cities").OrderBy("Name").OrderBy("State").StartAt("Springfield", "Missouri");
// [END firestore_query_cursor_start_at_field_value_multi]
QuerySnapshot snapshot1 = await query1.GetSnapshotAsync();
foreach (DocumentSnapshot documentSnapshot in snapshot1.Documents)
{
Console.WriteLine("Document {0} returned by start at Springfield query.", documentSnapshot.Id);
}
QuerySnapshot snapshot2 = await query2.GetSnapshotAsync();
foreach (DocumentSnapshot documentSnapshot in snapshot2.Documents)
{
Console.WriteLine("Document {0} returned by start at Springfield, Missouri query.", documentSnapshot.Id);
}
}
public static void Main(string[] args)
{
if (args.Length < 2)
{
Console.Write(Usage);
return;
}
string command = args[0].ToLower();
string project = string.Join(" ",
new ArraySegment<string>(args, 1, args.Length - 1));
switch (command)
{
case "start-at-field-query-cursor":
StartAtFieldQueryCursor(project).Wait();
break;
case "end-at-field-query-cursor":
EndAtFieldQueryCursor(project).Wait();
break;
case "document-snapshot-cursor":
DocumentSnapshotCursor(project).Wait();
break;
case "paginated-query-cursor":
PaginatedQueryCursor(project).Wait();
break;
case "multiple-cursor-conditions":
MultipleCursorConditions(project).Wait();
break;
default:
Console.Write(Usage);
return;
}
}
}
}