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Menjalankan kueri sederhana dan gabungan di Cloud Firestore

Cloud Firestore menyediakan fungsionalitas kueri yang dapat diandalkan untuk menentukan dokumen mana yang ingin Anda ambil dari koleksi atau grup koleksi. Kueri ini juga dapat digunakan dengan get() atau addSnapshotListener(), seperti yang dijelaskan dalam artikel Mendapatkan Data dan Mendapatkan Pembaruan Realtime.

Data contoh

Untuk memulai, tulis beberapa data mengenai kota agar kita dapat melihat berbagai cara untuk membacanya kembali:

Web version 9

import { collection, doc, setDoc } from "firebase/firestore";

const citiesRef = collection(db, "cities");

await setDoc(doc(citiesRef, "SF"), {
    name: "San Francisco", state: "CA", country: "USA",
    capital: false, population: 860000,
    regions: ["west_coast", "norcal"] });
await setDoc(doc(citiesRef, "LA"), {
    name: "Los Angeles", state: "CA", country: "USA",
    capital: false, population: 3900000,
    regions: ["west_coast", "socal"] });
await setDoc(doc(citiesRef, "DC"), {
    name: "Washington, D.C.", state: null, country: "USA",
    capital: true, population: 680000,
    regions: ["east_coast"] });
await setDoc(doc(citiesRef, "TOK"), {
    name: "Tokyo", state: null, country: "Japan",
    capital: true, population: 9000000,
    regions: ["kanto", "honshu"] });
await setDoc(doc(citiesRef, "BJ"), {
    name: "Beijing", state: null, country: "China",
    capital: true, population: 21500000,
    regions: ["jingjinji", "hebei"] });
example_data.js

Web version 8

var citiesRef = db.collection("cities");

citiesRef.doc("SF").set({
    name: "San Francisco", state: "CA", country: "USA",
    capital: false, population: 860000,
    regions: ["west_coast", "norcal"] });
citiesRef.doc("LA").set({
    name: "Los Angeles", state: "CA", country: "USA",
    capital: false, population: 3900000,
    regions: ["west_coast", "socal"] });
citiesRef.doc("DC").set({
    name: "Washington, D.C.", state: null, country: "USA",
    capital: true, population: 680000,
    regions: ["east_coast"] });
citiesRef.doc("TOK").set({
    name: "Tokyo", state: null, country: "Japan",
    capital: true, population: 9000000,
    regions: ["kanto", "honshu"] });
citiesRef.doc("BJ").set({
    name: "Beijing", state: null, country: "China",
    capital: true, population: 21500000,
    regions: ["jingjinji", "hebei"] });
test.firestore.js
Swift
Catatan: Produk ini tidak tersedia di target watchOS dan App Clip. 
let citiesRef = db.collection("cities")

citiesRef.document("SF").setData([
    "name": "San Francisco",
    "state": "CA",
    "country": "USA",
    "capital": false,
    "population": 860000,
    "regions": ["west_coast", "norcal"]
    ])
citiesRef.document("LA").setData([
    "name": "Los Angeles",
    "state": "CA",
    "country": "USA",
    "capital": false,
    "population": 3900000,
    "regions": ["west_coast", "socal"]
    ])
citiesRef.document("DC").setData([
    "name": "Washington D.C.",
    "country": "USA",
    "capital": true,
    "population": 680000,
    "regions": ["east_coast"]
    ])
citiesRef.document("TOK").setData([
    "name": "Tokyo",
    "country": "Japan",
    "capital": true,
    "population": 9000000,
    "regions": ["kanto", "honshu"]
    ])
citiesRef.document("BJ").setData([
    "name": "Beijing",
    "country": "China",
    "capital": true,
    "population": 21500000,
    "regions": ["jingjinji", "hebei"]
    ])
ViewController.swift
Objective-C
Catatan: Produk ini tidak tersedia di target watchOS dan App Clip. 
FIRCollectionReference *citiesRef = [self.db collectionWithPath:@"cities"];
[[citiesRef documentWithPath:@"SF"] setData:@{
  @"name": @"San Francisco",
  @"state": @"CA",
  @"country": @"USA",
  @"capital": @(NO),
  @"population": @860000,
  @"regions": @[@"west_coast", @"norcal"]
}];
[[citiesRef documentWithPath:@"LA"] setData:@{
  @"name": @"Los Angeles",
  @"state": @"CA",
  @"country": @"USA",
  @"capital": @(NO),
  @"population": @3900000,
  @"regions": @[@"west_coast", @"socal"]
}];
[[citiesRef documentWithPath:@"DC"] setData:@{
  @"name": @"Washington D.C.",
  @"country": @"USA",
  @"capital": @(YES),
  @"population": @680000,
  @"regions": @[@"east_coast"]
}];
[[citiesRef documentWithPath:@"TOK"] setData:@{
  @"name": @"Tokyo",
  @"country": @"Japan",
  @"capital": @(YES),
  @"population": @9000000,
  @"regions": @[@"kanto", @"honshu"]
}];
[[citiesRef documentWithPath:@"BJ"] setData:@{
  @"name": @"Beijing",
  @"country": @"China",
  @"capital": @(YES),
  @"population": @21500000,
  @"regions": @[@"jingjinji", @"hebei"]
}];
ViewController.m

Kotlin+KTX

val cities = db.collection("cities")

val data1 = hashMapOf(
    "name" to "San Francisco",
    "state" to "CA",
    "country" to "USA",
    "capital" to false,
    "population" to 860000,
    "regions" to listOf("west_coast", "norcal"),
)
cities.document("SF").set(data1)

val data2 = hashMapOf(
    "name" to "Los Angeles",
    "state" to "CA",
    "country" to "USA",
    "capital" to false,
    "population" to 3900000,
    "regions" to listOf("west_coast", "socal"),
)
cities.document("LA").set(data2)

val data3 = hashMapOf(
    "name" to "Washington D.C.",
    "state" to null,
    "country" to "USA",
    "capital" to true,
    "population" to 680000,
    "regions" to listOf("east_coast"),
)
cities.document("DC").set(data3)

val data4 = hashMapOf(
    "name" to "Tokyo",
    "state" to null,
    "country" to "Japan",
    "capital" to true,
    "population" to 9000000,
    "regions" to listOf("kanto", "honshu"),
)
cities.document("TOK").set(data4)

val data5 = hashMapOf(
    "name" to "Beijing",
    "state" to null,
    "country" to "China",
    "capital" to true,
    "population" to 21500000,
    "regions" to listOf("jingjinji", "hebei"),
)
cities.document("BJ").set(data5)
DocSnippets.kt

Java

CollectionReference cities = db.collection("cities");

Map<String, Object> data1 = new HashMap<>();
data1.put("name", "San Francisco");
data1.put("state", "CA");
data1.put("country", "USA");
data1.put("capital", false);
data1.put("population", 860000);
data1.put("regions", Arrays.asList("west_coast", "norcal"));
cities.document("SF").set(data1);

Map<String, Object> data2 = new HashMap<>();
data2.put("name", "Los Angeles");
data2.put("state", "CA");
data2.put("country", "USA");
data2.put("capital", false);
data2.put("population", 3900000);
data2.put("regions", Arrays.asList("west_coast", "socal"));
cities.document("LA").set(data2);

Map<String, Object> data3 = new HashMap<>();
data3.put("name", "Washington D.C.");
data3.put("state", null);
data3.put("country", "USA");
data3.put("capital", true);
data3.put("population", 680000);
data3.put("regions", Arrays.asList("east_coast"));
cities.document("DC").set(data3);

Map<String, Object> data4 = new HashMap<>();
data4.put("name", "Tokyo");
data4.put("state", null);
data4.put("country", "Japan");
data4.put("capital", true);
data4.put("population", 9000000);
data4.put("regions", Arrays.asList("kanto", "honshu"));
cities.document("TOK").set(data4);

Map<String, Object> data5 = new HashMap<>();
data5.put("name", "Beijing");
data5.put("state", null);
data5.put("country", "China");
data5.put("capital", true);
data5.put("population", 21500000);
data5.put("regions", Arrays.asList("jingjinji", "hebei"));
cities.document("BJ").set(data5);
DocSnippets.java

Dart

final cities = db.collection("cities");
final data1 = <String, dynamic>{
  "name": "San Francisco",
  "state": "CA",
  "country": "USA",
  "capital": false,
  "population": 860000,
  "regions": ["west_coast", "norcal"]
};
cities.doc("SF").set(data1);

final data2 = <String, dynamic>{
  "name": "Los Angeles",
  "state": "CA",
  "country": "USA",
  "capital": false,
  "population": 3900000,
  "regions": ["west_coast", "socal"],
};
cities.doc("LA").set(data2);

final data3 = <String, dynamic>{
  "name": "Washington D.C.",
  "state": null,
  "country": "USA",
  "capital": true,
  "population": 680000,
  "regions": ["east_coast"]
};
cities.doc("DC").set(data3);

final data4 = <String, dynamic>{
  "name": "Tokyo",
  "state": null,
  "country": "Japan",
  "capital": true,
  "population": 9000000,
  "regions": ["kanto", "honshu"]
};
cities.doc("TOK").set(data4);

final data5 = <String, dynamic>{
  "name": "Beijing",
  "state": null,
  "country": "China",
  "capital": true,
  "population": 21500000,
  "regions": ["jingjinji", "hebei"],
};
cities.doc("BJ").set(data5);
firestore.dart
Java
CollectionReference cities = db.collection("cities");
List<ApiFuture<WriteResult>> futures = new ArrayList<>();
futures.add(
    cities
        .document("SF")
        .set(
            new City(
                "San Francisco",
                "CA",
                "USA",
                false,
                860000L,
                Arrays.asList("west_coast", "norcal"))));
futures.add(
    cities
        .document("LA")
        .set(
            new City(
                "Los Angeles",
                "CA",
                "USA",
                false,
                3900000L,
                Arrays.asList("west_coast", "socal"))));
futures.add(
    cities
        .document("DC")
        .set(
            new City(
                "Washington D.C.", null, "USA", true, 680000L, Arrays.asList("east_coast"))));
futures.add(
    cities
        .document("TOK")
        .set(
            new City(
                "Tokyo", null, "Japan", true, 9000000L, Arrays.asList("kanto", "honshu"))));
futures.add(
    cities
        .document("BJ")
        .set(
            new City(
                "Beijing",
                null,
                "China",
                true,
                21500000L,
                Arrays.asList("jingjinji", "hebei"))));
// (optional) block on documents successfully added
ApiFutures.allAsList(futures).get();
QueryDataSnippets.java
Python
class City(object):
    def __init__(self, name, state, country, capital=False, population=0,
                 regions=[]):
        self.name = name
        self.state = state
        self.country = country
        self.capital = capital
        self.population = population
        self.regions = regions

    @staticmethod
    def from_dict(source):
        # ...

    def to_dict(self):
        # ...

    def __repr__(self):
        return (
            f'City(\
                name={self.name}, \
                country={self.country}, \
                population={self.population}, \
                capital={self.capital}, \
                regions={self.regions}\
            )'
        )
cities_ref = db.collection(u'cities')
cities_ref.document(u'BJ').set(
    City(u'Beijing', None, u'China', True, 21500000, [u'hebei']).to_dict())
cities_ref.document(u'SF').set(
    City(u'San Francisco', u'CA', u'USA', False, 860000,
         [u'west_coast', u'norcal']).to_dict())
cities_ref.document(u'LA').set(
    City(u'Los Angeles', u'CA', u'USA', False, 3900000,
         [u'west_coast', u'socal']).to_dict())
cities_ref.document(u'DC').set(
    City(u'Washington D.C.', None, u'USA', True, 680000,
         [u'east_coast']).to_dict())
cities_ref.document(u'TOK').set(
    City(u'Tokyo', None, u'Japan', True, 9000000,
         [u'kanto', u'honshu']).to_dict())
snippets.py

Python

class City(object):
    def __init__(self, name, state, country, capital=False, population=0, regions=[]):
        self.name = name
        self.state = state
        self.country = country
        self.capital = capital
        self.population = population
        self.regions = regions

    @staticmethod
    def from_dict(source):
        # ...

    def to_dict(self):
        # ...

    def __repr__(self):
        return f"City(\
                name={self.name}, \
                country={self.country}, \
                population={self.population}, \
                capital={self.capital}, \
                regions={self.regions}\
            )"

cities_ref = db.collection("cities")
await cities_ref.document("BJ").set(
    City("Beijing", None, "China", True, 21500000, ["hebei"]).to_dict()
)
await cities_ref.document("SF").set(
    City(
        "San Francisco", "CA", "USA", False, 860000, ["west_coast", "norcal"]
    ).to_dict()
)
await cities_ref.document("LA").set(
    City(
        "Los Angeles", "CA", "USA", False, 3900000, ["west_coast", "socal"]
    ).to_dict()
)
await cities_ref.document("DC").set(
    City("Washington D.C.", None, "USA", True, 680000, ["east_coast"]).to_dict()
)
await cities_ref.document("TOK").set(
    City("Tokyo", None, "Japan", True, 9000000, ["kanto", "honshu"]).to_dict()
)
snippets.py
C++
CollectionReference cities = db->Collection("cities");

cities.Document("SF").Set({
    {"name", FieldValue::String("San Francisco")},
    {"state", FieldValue::String("CA")},
    {"country", FieldValue::String("USA")},
    {"capital", FieldValue::Boolean(false)},
    {"population", FieldValue::Integer(860000)},
    {"regions", FieldValue::Array({FieldValue::String("west_coast"),
                                   FieldValue::String("norcal")})},
});

cities.Document("LA").Set({
    {"name", FieldValue::String("Los Angeles")},
    {"state", FieldValue::String("CA")},
    {"country", FieldValue::String("USA")},
    {"capital", FieldValue::Boolean(false)},
    {"population", FieldValue::Integer(3900000)},
    {"regions", FieldValue::Array({FieldValue::String("west_coast"),
                                   FieldValue::String("socal")})},
});

cities.Document("DC").Set({
    {"name", FieldValue::String("Washington D.C.")},
    {"state", FieldValue::Null()},
    {"country", FieldValue::String("USA")},
    {"capital", FieldValue::Boolean(true)},
    {"population", FieldValue::Integer(680000)},
    {"regions",
     FieldValue::Array({FieldValue::String("east_coast")})},
});

cities.Document("TOK").Set({
    {"name", FieldValue::String("Tokyo")},
    {"state", FieldValue::Null()},
    {"country", FieldValue::String("Japan")},
    {"capital", FieldValue::Boolean(true)},
    {"population", FieldValue::Integer(9000000)},
    {"regions", FieldValue::Array({FieldValue::String("kanto"),
                                   FieldValue::String("honshu")})},
});

cities.Document("BJ").Set({
    {"name", FieldValue::String("Beijing")},
    {"state", FieldValue::Null()},
    {"country", FieldValue::String("China")},
    {"capital", FieldValue::Boolean(true)},
    {"population", FieldValue::Integer(21500000)},
    {"regions", FieldValue::Array({FieldValue::String("jingjinji"),
                                   FieldValue::String("hebei")})},
});
snippets.cpp
Node.js
const citiesRef = db.collection('cities');

await citiesRef.doc('SF').set({
  name: 'San Francisco', state: 'CA', country: 'USA',
  capital: false, population: 860000,
  regions: ['west_coast', 'norcal']
});
await citiesRef.doc('LA').set({
  name: 'Los Angeles', state: 'CA', country: 'USA',
  capital: false, population: 3900000,
  regions: ['west_coast', 'socal']
});
await citiesRef.doc('DC').set({
  name: 'Washington, D.C.', state: null, country: 'USA',
  capital: true, population: 680000,
  regions: ['east_coast']
});
await citiesRef.doc('TOK').set({
  name: 'Tokyo', state: null, country: 'Japan',
  capital: true, population: 9000000,
  regions: ['kanto', 'honshu']
});
await citiesRef.doc('BJ').set({
  name: 'Beijing', state: null, country: 'China',
  capital: true, population: 21500000,
  regions: ['jingjinji', 'hebei']
});
index.js
Go
cities := []struct {
	id string
	c  City
}{
	{
		id: "SF",
		c: City{Name: "San Francisco", State: "CA", Country: "USA",
			Capital: false, Population: 860000,
			Regions: []string{"west_coast", "norcal"}},
	},
	{
		id: "LA",
		c: City{Name: "Los Angeles", State: "CA", Country: "USA",
			Capital: false, Population: 3900000,
			Regions: []string{"west_coast", "socal"}},
	},
	{
		id: "DC",
		c: City{Name: "Washington D.C.", Country: "USA",
			Capital: true, Population: 680000,
			Regions: []string{"east_coast"}},
	},
	{
		id: "TOK",
		c: City{Name: "Tokyo", Country: "Japan",
			Capital: true, Population: 9000000,
			Regions: []string{"kanto", "honshu"}},
	},
	{
		id: "BJ",
		c: City{Name: "Beijing", Country: "China",
			Capital: true, Population: 21500000,
			Regions: []string{"jingjinji", "hebei"}},
	},
}
for _, c := range cities {
	if _, err := client.Collection("cities").Doc(c.id).Set(ctx, c.c); err != nil {
		return err
	}
}
query.go
PHP
$citiesRef = $db->collection('samples/php/cities');
$citiesRef->document('SF')->set([
    'name' => 'San Francisco',
    'state' => 'CA',
    'country' => 'USA',
    'capital' => false,
    'population' => 860000,
    'regions' => ['west_coast', 'norcal']
]);
$citiesRef->document('LA')->set([
    'name' => 'Los Angeles',
    'state' => 'CA',
    'country' => 'USA',
    'capital' => false,
    'population' => 3900000,
    'regions' => ['west_coast', 'socal']
]);
$citiesRef->document('DC')->set([
    'name' => 'Washington D.C.',
    'state' => null,
    'country' => 'USA',
    'capital' => true,
    'population' => 680000,
    'regions' => ['east_coast']
]);
$citiesRef->document('TOK')->set([
    'name' => 'Tokyo',
    'state' => null,
    'country' => 'Japan',
    'capital' => true,
    'population' => 9000000,
    'regions' => ['kanto', 'honshu']
]);
$citiesRef->document('BJ')->set([
    'name' => 'Beijing',
    'state' => null,
    'country' => 'China',
    'capital' => true,
    'population' => 21500000,
    'regions' => ['jingjinji', 'hebei']
]);
printf('Added example cities data to the cities collection.' . PHP_EOL);
query_filter_dataset.php
Unity
CollectionReference citiesRef = db.Collection("cities");
citiesRef.Document("SF").SetAsync(new Dictionary<string, object>(){
    { "Name", "San Francisco" },
    { "State", "CA" },
    { "Country", "USA" },
    { "Capital", false },
    { "Population", 860000 },
    { "Regions", new ArrayList{"west_coast", "norcal"} }
});
citiesRef.Document("LA").SetAsync(new Dictionary<string, object>(){
    { "Name", "Los Angeles" },
    { "State", "CA" },
    { "Country", "USA" },
    { "Capital", false },
    { "Population", 3900000 },
    { "Regions", new ArrayList{"west_coast", "socal"} }
});
citiesRef.Document("DC").SetAsync(new Dictionary<string, object>(){
    { "Name", "Washington D.C." },
    { "State", null },
    { "Country", "USA" },
    { "Capital", true },
    { "Population", 680000 },
    { "Regions", new ArrayList{"east_coast"} }
});
citiesRef.Document("TOK").SetAsync(new Dictionary<string, object>(){
    { "Name", "Tokyo" },
    { "State", null },
    { "Country", "Japan" },
    { "Capital", true },
    { "Population", 9000000 },
    { "Regions", new ArrayList{"kanto", "honshu"} }
});
citiesRef.Document("BJ").SetAsync(new Dictionary<string, object>(){
    { "Name", "Beijing" },
    { "State", null },
    { "Country", "China" },
    { "Capital", true },
    { "Population", 21500000 },
    { "Regions", new ArrayList{"jingjinji", "hebei"} }
});
C#
CollectionReference citiesRef = db.Collection("cities");
await citiesRef.Document("SF").SetAsync(new Dictionary<string, object>(){
    { "Name", "San Francisco" },
    { "State", "CA" },
    { "Country", "USA" },
    { "Capital", false },
    { "Population", 860000 },
    { "Regions", new ArrayList{"west_coast", "norcal"} }
});
await citiesRef.Document("LA").SetAsync(new Dictionary<string, object>(){
    { "Name", "Los Angeles" },
    { "State", "CA" },
    { "Country", "USA" },
    { "Capital", false },
    { "Population", 3900000 },
    { "Regions", new ArrayList{"west_coast", "socal"} }
});
await citiesRef.Document("DC").SetAsync(new Dictionary<string, object>(){
    { "Name", "Washington D.C." },
    { "State", null },
    { "Country", "USA" },
    { "Capital", true },
    { "Population", 680000 },
    { "Regions", new ArrayList{"east_coast"} }
});
await citiesRef.Document("TOK").SetAsync(new Dictionary<string, object>(){
    { "Name", "Tokyo" },
    { "State", null },
    { "Country", "Japan" },
    { "Capital", true },
    { "Population", 9000000 },
    { "Regions", new ArrayList{"kanto", "honshu"} }
});
await citiesRef.Document("BJ").SetAsync(new Dictionary<string, object>(){
    { "Name", "Beijing" },
    { "State", null },
    { "Country", "China" },
    { "Capital", true },
    { "Population", 21500000 },
    { "Regions", new ArrayList{"jingjinji", "hebei"} }
});
Console.WriteLine("Added example cities data to the cities collection.");
Program.cs
Ruby
cities_ref = firestore.col collection_path
cities_ref.doc("SF").set(
  {
    name:       "San Francisco",
    state:      "CA",
    country:    "USA",
    capital:    false,
    population: 860_000,
    regions:    ["west_coast", "norcal"]
  }
)
cities_ref.doc("LA").set(
  {
    name:       "Los Angeles",
    state:      "CA",
    country:    "USA",
    capital:    false,
    population: 3_900_000,
    regions:    ["west_coast", "socal"]
  }
)
cities_ref.doc("DC").set(
  {
    name:       "Washington D.C.",
    state:      nil,
    country:    "USA",
    capital:    true,
    population: 680_000,
    regions:    ["east_coast"]
  }
)
cities_ref.doc("TOK").set(
  {
    name:       "Tokyo",
    state:      nil,
    country:    "Japan",
    capital:    true,
    population: 9_000_000,
    regions:    ["kanto", "honshu"]
  }
)
cities_ref.doc("BJ").set(
  {
    name:       "Beijing",
    state:      nil,
    country:    "China",
    capital:    true,
    population: 21_500_000,
    regions:    ["jingjinji", "hebei"]
  }
)
query_data.rb

Kueri sederhana

Kueri berikut menampilkan semua kota dengan negara bagian CA:

Web version 9

// Create a reference to the cities collection
import { collection, query, where } from "firebase/firestore";
const citiesRef = collection(db, "cities");

// Create a query against the collection.
const q = query(citiesRef, where("state", "==", "CA"));
simple_queries.js

Web version 8

// Create a reference to the cities collection
var citiesRef = db.collection("cities");

// Create a query against the collection.
var query = citiesRef.where("state", "==", "CA");
test.firestore.js
Swift
Catatan: Produk ini tidak tersedia di target watchOS dan App Clip. 
// Create a reference to the cities collection
let citiesRef = db.collection("cities")

// Create a query against the collection.
let query = citiesRef.whereField("state", isEqualTo: "CA")
ViewController.swift
Objective-C
Catatan: Produk ini tidak tersedia di target watchOS dan App Clip. 
// Create a reference to the cities collection
FIRCollectionReference *citiesRef = [self.db collectionWithPath:@"cities"];
// Create a query against the collection.
FIRQuery *query = [citiesRef queryWhereField:@"state" isEqualTo:@"CA"];
ViewController.m

Kotlin+KTX

// Create a reference to the cities collection
val citiesRef = db.collection("cities")

// Create a query against the collection.
val query = citiesRef.whereEqualTo("state", "CA")
DocSnippets.kt

Java

// Create a reference to the cities collection
CollectionReference citiesRef = db.collection("cities");

// Create a query against the collection.
Query query = citiesRef.whereEqualTo("state", "CA");
DocSnippets.java

Dart

// Create a reference to the cities collection
final citiesRef = db.collection("cities");

// Create a query against the collection.
final query = citiesRef.where("state", isEqualTo: "CA");
firestore.dart
Java
// Create a reference to the cities collection
CollectionReference cities = db.collection("cities");
// Create a query against the collection.
Query query = cities.whereEqualTo("state", "CA");
// retrieve  query results asynchronously using query.get()
ApiFuture<QuerySnapshot> querySnapshot = query.get();

for (DocumentSnapshot document : querySnapshot.get().getDocuments()) {
  System.out.println(document.getId());
}
QueryDataSnippets.java
Python
# Create a reference to the cities collection
cities_ref = db.collection(u'cities')

# Create a query against the collection
query_ref = cities_ref.where(u'state', u'==', u'CA')
snippets.py

Python

# Create a reference to the cities collection
cities_ref = db.collection("cities")

# Create a query against the collection
query_ref = cities_ref.where("state", "==", "CA")
snippets.py
C++
CollectionReference cities_ref = db->Collection("cities");
// Create a query against the collection.
Query query_ca =
    cities_ref.WhereEqualTo("state", FieldValue::String("CA"));
snippets.cpp
Node.js
// Create a reference to the cities collection
const citiesRef = db.collection('cities');

// Create a query against the collection
const queryRef = citiesRef.where('state', '==', 'CA');
index.js
Go
query := client.Collection("cities").Where("state", "==", "CA")
query.go
PHP
$citiesRef = $db->collection('samples/php/cities');
$query = $citiesRef->where('state', '=', 'CA');
$snapshot = $query->documents();
foreach ($snapshot as $document) {
    printf('Document %s returned by query state=CA' . PHP_EOL, $document->id());
}
query_filter_eq_string.php
Unity
CollectionReference citiesRef = db.Collection("cities");
Query query = citiesRef.WhereEqualTo("State", "CA");
query.GetSnapshotAsync().ContinueWithOnMainThread((querySnapshotTask) =>
{
    foreach (DocumentSnapshot documentSnapshot in querySnapshotTask.Result.Documents)
    {
        Debug.Log(String.Format("Document {0} returned by query State=CA", documentSnapshot.Id));
    }
});
C#
CollectionReference citiesRef = db.Collection("cities");
Query query = citiesRef.WhereEqualTo("State", "CA");
QuerySnapshot querySnapshot = await query.GetSnapshotAsync();
foreach (DocumentSnapshot documentSnapshot in querySnapshot.Documents)
{
    Console.WriteLine("Document {0} returned by query State=CA", documentSnapshot.Id);
}
Program.cs
Ruby
cities_ref = firestore.col collection_path

query = cities_ref.where "state", "=", "CA"

query.get do |city|
  puts "Document #{city.document_id} returned by query state=CA."
end
query_data.rb

Kueri berikut menampilkan semua ibu kota:

Web version 9

import { collection, query, where } from "firebase/firestore";
const citiesRef = collection(db, "cities");

const q = query(citiesRef, where("capital", "==", true));
simple_queries_again.js

Web version 8

var citiesRef = db.collection("cities");

var query = citiesRef.where("capital", "==", true);
test.firestore.js
Swift
Catatan: Produk ini tidak tersedia di target watchOS dan App Clip. 
let capitalCities = db.collection("cities").whereField("capital", isEqualTo: true)
ViewController.swift
Objective-C
Catatan: Produk ini tidak tersedia di target watchOS dan App Clip. 
FIRQuery *capitalCities =
    [[self.db collectionWithPath:@"cities"] queryWhereField:@"capital" isEqualTo:@YES];
ViewController.m

Kotlin+KTX

val capitalCities = db.collection("cities").whereEqualTo("capital", true)
DocSnippets.kt

Java

Query capitalCities = db.collection("cities").whereEqualTo("capital", true);
DocSnippets.java

Dart

final capitalcities =
    db.collection("cities").where("capital", isEqualTo: true);
firestore.dart
Java
// Create a reference to the cities collection
CollectionReference cities = db.collection("cities");
// Create a query against the collection.
Query query = cities.whereEqualTo("capital", true);
// retrieve  query results asynchronously using query.get()
ApiFuture<QuerySnapshot> querySnapshot = query.get();

for (DocumentSnapshot document : querySnapshot.get().getDocuments()) {
  System.out.println(document.getId());
}
QueryDataSnippets.java
Python
cities_ref = db.collection(u'cities')

query = cities_ref.where(u'capital', u'==', True)
snippets.py

Python

cities_ref = db.collection("cities")

query = cities_ref.where("capital", "==", True)
snippets.py
C++
Query capital_cities = db->Collection("cities").WhereEqualTo(
    "capital", FieldValue::Boolean(true));
snippets.cpp
Node.js
// Create a reference to the cities collection
const citiesRef = db.collection('cities');

// Create a query against the collection
const allCapitalsRes = await citiesRef.where('capital', '==', true).get();
index.js
Go
query := client.Collection("cities").Where("capital", "==", true)
query.go
PHP
$citiesRef = $db->collection('samples/php/cities');
$query = $citiesRef->where('capital', '=', true);
$snapshot = $query->documents();
foreach ($snapshot as $document) {
    printf('Document %s returned by query capital=true' . PHP_EOL, $document->id());
}
query_filter_eq_boolean.php
Unity
CollectionReference citiesRef = db.Collection("cities");
Query query = citiesRef.WhereEqualTo("Capital", true);
query.GetSnapshotAsync().ContinueWithOnMainThread((querySnapshotTask) =>
{
    foreach (DocumentSnapshot documentSnapshot in querySnapshotTask.Result.Documents)
    {
        Debug.Log(String.Format("Document {0} returned by query Capital=true", documentSnapshot.Id));
    }
});
C#
CollectionReference citiesRef = db.Collection("cities");
Query query = citiesRef.WhereEqualTo("Capital", true);
QuerySnapshot querySnapshot = await query.GetSnapshotAsync();
foreach (DocumentSnapshot documentSnapshot in querySnapshot.Documents)
{
    Console.WriteLine("Document {0} returned by query Capital=true", documentSnapshot.Id);
}
Program.cs
Ruby
cities_ref = firestore.col collection_path

query = cities_ref.where "capital", "=", true

query.get do |city|
  puts "Document #{city.document_id} returned by query capital=true."
end
query_data.rb

Menjalankan kueri

Setelah membuat objek kueri, gunakan fungsi get() untuk mengambil hasilnya:

Web version 9

import { collection, query, where, getDocs } from "firebase/firestore";

const q = query(collection(db, "cities"), where("capital", "==", true));

const querySnapshot = await getDocs(q);
querySnapshot.forEach((doc) => {
  // doc.data() is never undefined for query doc snapshots
  console.log(doc.id, " => ", doc.data());
});
get_multiple.js

Web version 8

db.collection("cities").where("capital", "==", true)
    .get()
    .then((querySnapshot) => {
        querySnapshot.forEach((doc) => {
            // doc.data() is never undefined for query doc snapshots
            console.log(doc.id, " => ", doc.data());
        });
    })
    .catch((error) => {
        console.log("Error getting documents: ", error);
    });
test.firestore.js
Swift
Catatan: Produk ini tidak tersedia di target watchOS dan App Clip. 
db.collection("cities").whereField("capital", isEqualTo: true)
    .getDocuments() { (querySnapshot, err) in
        if let err = err {
            print("Error getting documents: \(err)")
        } else {
            for document in querySnapshot!.documents {
                print("\(document.documentID) => \(document.data())")
            }
        }
}
ViewController.swift
Objective-C
Catatan: Produk ini tidak tersedia di target watchOS dan App Clip. 
[[[self.db collectionWithPath:@"cities"] queryWhereField:@"capital" isEqualTo:@(YES)]
    getDocumentsWithCompletion:^(FIRQuerySnapshot *snapshot, NSError *error) {
      if (error != nil) {
        NSLog(@"Error getting documents: %@", error);
      } else {
        for (FIRDocumentSnapshot *document in snapshot.documents) {
          NSLog(@"%@ => %@", document.documentID, document.data);
        }
      }
    }];
ViewController.m

Kotlin+KTX

db.collection("cities")
    .whereEqualTo("capital", true)
    .get()
    .addOnSuccessListener { documents ->
        for (document in documents) {
            Log.d(TAG, "${document.id} => ${document.data}")
        }
    }
    .addOnFailureListener { exception ->
        Log.w(TAG, "Error getting documents: ", exception)
    }
DocSnippets.kt

Java

db.collection("cities")
        .whereEqualTo("capital", true)
        .get()
        .addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {
            @Override
            public void onComplete(@NonNull Task<QuerySnapshot> task) {
                if (task.isSuccessful()) {
                    for (QueryDocumentSnapshot document : task.getResult()) {
                        Log.d(TAG, document.getId() + " => " + document.getData());
                    }
                } else {
                    Log.d(TAG, "Error getting documents: ", task.getException());
                }
            }
        });
DocSnippets.java

Dart

db.collection("cities").where("capital", isEqualTo: true).get().then(
      (querySnapshot) {
        print("Successfully completed");
        for (var docSnapshot in querySnapshot.docs) {
          print('${docSnapshot.id} => ${docSnapshot.data()}');
        }
      },
      onError: (e) => print("Error completing: $e"),
    );
firestore.dart
Java
// asynchronously retrieve multiple documents
ApiFuture<QuerySnapshot> future = db.collection("cities").whereEqualTo("capital", true).get();
// future.get() blocks on response
List<QueryDocumentSnapshot> documents = future.get().getDocuments();
for (DocumentSnapshot document : documents) {
  System.out.println(document.getId() + " => " + document.toObject(City.class));
}
RetrieveDataSnippets.java
Python
# Note: Use of CollectionRef stream() is prefered to get()
docs = db.collection(u'cities').where(u'capital', u'==', True).stream()

for doc in docs:
    print(f'{doc.id} => {doc.to_dict()}')
snippets.py

Python

# Note: Use of CollectionRef stream() is prefered to get()
docs = db.collection("cities").where("capital", "==", True).stream()

async for doc in docs:
    print(f"{doc.id} => {doc.to_dict()}")
snippets.py
C++
db->Collection("cities")
    .WhereEqualTo("capital", FieldValue::Boolean(true))
    .Get()
    .OnCompletion([](const Future<QuerySnapshot>& future) {
      if (future.error() == Error::kErrorOk) {
        for (const DocumentSnapshot& document :
             future.result()->documents()) {
          std::cout << document << std::endl;
        }
      } else {
        std::cout << "Error getting documents: " << future.error_message()
                  << std::endl;
      }
    });
snippets.cpp
Node.js
const citiesRef = db.collection('cities');
const snapshot = await citiesRef.where('capital', '==', true).get();
if (snapshot.empty) {
  console.log('No matching documents.');
  return;
}

snapshot.forEach(doc => {
  console.log(doc.id, '=>', doc.data());
});
index.js
Go
fmt.Println("All capital cities:")
iter := client.Collection("cities").Where("capital", "==", true).Documents(ctx)
for {
	doc, err := iter.Next()
	if err == iterator.Done {
		break
	}
	if err != nil {
		return err
	}
	fmt.Println(doc.Data())
}
retrieve.go
PHP

PHP

Untuk mengetahui informasi lebih lanjut tentang cara menginstal dan membuat klien Cloud Firestore, lihat Library Klien Cloud Firestore. 

$citiesRef = $db->collection('samples/php/cities');
$query = $citiesRef->where('capital', '=', true);
$documents = $query->documents();
foreach ($documents as $document) {
    if ($document->exists()) {
        printf('Document data for document %s:' . PHP_EOL, $document->id());
        print_r($document->data());
        printf(PHP_EOL);
    } else {
        printf('Document %s does not exist!' . PHP_EOL, $document->id());
    }
}
data_query.php
Unity
Query capitalQuery = db.Collection("cities").WhereEqualTo("Capital", true);
capitalQuery.GetSnapshotAsync().ContinueWithOnMainThread(task => {
  QuerySnapshot capitalQuerySnapshot = task.Result;
  foreach (DocumentSnapshot documentSnapshot in capitalQuerySnapshot.Documents) {
    Debug.Log(String.Format("Document data for {0} document:", documentSnapshot.Id));
    Dictionary<string, object> city = documentSnapshot.ToDictionary();
    foreach (KeyValuePair<string, object> pair in city) {
      Debug.Log(String.Format("{0}: {1}", pair.Key, pair.Value));
    }

    // Newline to separate entries
    Debug.Log("");
  };
});
C#
Query capitalQuery = db.Collection("cities").WhereEqualTo("Capital", true);
QuerySnapshot capitalQuerySnapshot = await capitalQuery.GetSnapshotAsync();
foreach (DocumentSnapshot documentSnapshot in capitalQuerySnapshot.Documents)
{
    Console.WriteLine("Document data for {0} document:", documentSnapshot.Id);
    Dictionary<string, object> city = documentSnapshot.ToDictionary();
    foreach (KeyValuePair<string, object> pair in city)
    {
        Console.WriteLine("{0}: {1}", pair.Key, pair.Value);
    }
    Console.WriteLine("");
}
Program.cs
Ruby
cities_ref = firestore.col collection_path

query = cities_ref.where "capital", "=", true

query.get do |city|
  puts "#{city.document_id} data: #{city.data}."
end
get_data.rb

Lihat artikel Mendapatkan Data untuk informasi selengkapnya tentang cara mengambil hasil kueri. Anda juga dapat menambahkan pemroses ke kueri untuk mendapatkan hasil saat ini dan memantau perubahan mendatang.

Operator kueri

Metode where() memerlukan tiga parameter: kolom untuk memfilter, operator perbandingan, dan nilai. Cloud Firestore mendukung operator perbandingan berikut ini:

Contoh:

Web version 9

const stateQuery = query(citiesRef, where("state", "==", "CA"));
const populationQuery = query(citiesRef, where("population", "<", 100000));
const nameQuery = query(citiesRef, where("name", ">=", "San Francisco"));
example_filters.js

Web version 8

const stateQuery = citiesRef.where("state", "==", "CA");
const populationQuery = citiesRef.where("population", "<", 100000);
const nameQuery = citiesRef.where("name", ">=", "San Francisco");
test.firestore.js
Swift
Catatan: Produk ini tidak tersedia di target watchOS dan App Clip. 
let stateQuery = citiesRef.whereField("state", isEqualTo: "CA")
let populationQuery = citiesRef.whereField("population", isLessThan: 100000)
let nameQuery = citiesRef.whereField("name", isGreaterThanOrEqualTo: "San Francisco")
ViewController.swift
Objective-C
Catatan: Produk ini tidak tersedia di target watchOS dan App Clip. 
FIRQuery *stateQuery = [citiesRef queryWhereField:@"state" isEqualTo:@"CA"];
FIRQuery *populationQuery = [citiesRef queryWhereField:@"population" isLessThan:@100000];
FIRQuery *nameQuery = [citiesRef queryWhereField:@"name" isGreaterThanOrEqualTo:@"San Francisco"];
ViewController.m

Kotlin+KTX

val stateQuery = citiesRef.whereEqualTo("state", "CA")
val populationQuery = citiesRef.whereLessThan("population", 100000)
val nameQuery = citiesRef.whereGreaterThanOrEqualTo("name", "San Francisco")
DocSnippets.kt

Java

Query stateQuery = citiesRef.whereEqualTo("state", "CA");
Query populationQuery = citiesRef.whereLessThan("population", 100000);
Query nameQuery = citiesRef.whereGreaterThanOrEqualTo("name", "San Francisco");
DocSnippets.java

Dart

final citiesRef = db.collection("cities");
final stateQuery = citiesRef.where("state", isEqualTo: "CA");
final populationQuery = citiesRef.where("population", isLessThan: 100000);
final nameQuery = citiesRef.where("name", isEqualTo: "San Francisco");
firestore.dart
Java
Query stateQuery = cities.whereEqualTo("state", "CA");
Query populationQuery = cities.whereLessThan("population", 1000000L);
Query nameQuery = cities.whereGreaterThanOrEqualTo("name", "San Francisco");
QueryDataSnippets.java
Python
cities_ref = db.collection(u'cities')

cities_ref.where(u'state', u'==', u'CA')
cities_ref.where(u'population', u'<', 1000000)
cities_ref.where(u'name', u'>=', u'San Francisco')
snippets.py

Python

cities_ref = db.collection("cities")

cities_ref.where("state", "==", "CA")
cities_ref.where("population", "<", 1000000)
cities_ref.where("name", ">=", "San Francisco")
snippets.py
C++
cities_ref.WhereEqualTo("state", FieldValue::String("CA"));
cities_ref.WhereLessThan("population", FieldValue::Integer(100000));
cities_ref.WhereGreaterThanOrEqualTo("name",
                                     FieldValue::String("San Francisco"));
snippets.cpp
Node.js
const stateQueryRes = await citiesRef.where('state', '==', 'CA').get();
const populationQueryRes = await citiesRef.where('population', '<', 1000000).get();
const nameQueryRes = await citiesRef.where('name', '>=', 'San Francisco').get();
index.js
Go
countryQuery := cities.Where("state", "==", "CA")
popQuery := cities.Where("population", "<", 1000000)
cityQuery := cities.Where("name", ">=", "San Francisco")
query.go
PHP
$stateQuery = $citiesRef->where('state', '=', 'CA');
$populationQuery = $citiesRef->where('population', '>', 1000000);
$nameQuery = $citiesRef->where('name', '>=', 'San Francisco');
query_filter_single_examples.php
Unity
Query stateQuery = citiesRef.WhereEqualTo("State", "CA");
Query populationQuery = citiesRef.WhereGreaterThan("Population", 1000000);
Query nameQuery = citiesRef.WhereGreaterThanOrEqualTo("Name", "San Francisco");
C#
Query stateQuery = citiesRef.WhereEqualTo("State", "CA");
Query populationQuery = citiesRef.WhereGreaterThan("Population", 1000000);
Query nameQuery = citiesRef.WhereGreaterThanOrEqualTo("Name", "San Francisco");
Program.cs
Ruby
state_query      = cities_ref.where "state", "=", "CA"
population_query = cities_ref.where "population", ">", 1_000_000
name_query       = cities_ref.where "name", ">=", "San Francisco"
query_data.rb

Tidak sama dengan (!=)

Gunakan operator tidak sama dengan (!=) untuk menampilkan dokumen yang memiliki kolom yang dimaksud dan nilai kolom tersebut tidak sama dengan nilai perbandingan. Contoh:

Web version 9

const notCapitalQuery = query(citiesRef, where("capital", "!=", false));
simple_query_not_equal.js

Web version 8

citiesRef.where("capital", "!=", false);
test.firestore.js
Swift
Catatan: Produk ini tidak tersedia di target watchOS dan App Clip. 
let notEqualQuery = citiesRef.whereField("capital", isNotEqualTo: false)
ViewController.swift
Objective-C
Catatan: Produk ini tidak tersedia di target watchOS dan App Clip. 
query = [citiesRef queryWhereField:@"capital" isNotEqualTo:@NO];
ViewController.m

Kotlin+KTX

val notCapitalQuery = citiesRef.whereNotEqualTo("capital", false)
DocSnippets.kt

Java

Query notCapitalQuery = citiesRef.whereNotEqualTo("capital", false);
DocSnippets.java

Dart

final citiesRef = db.collection("cities");
final notCapitals = citiesRef.where("capital", isNotEqualTo: true);
firestore.dart
Java
CollectionReference citiesRef = db.collection("cities");

Query query = citiesRef.whereNotEqualTo("capital", false);
QueryDataSnippets.java
Python
// Snippet not yet available
C++
// Snippet not yet available
Node.js
const capitalNotFalseRes = await citiesRef.where('capital', '!=', false).get();
index.js
Go
// Snippet not yet available
PHP
$stateQuery = $citiesRef->where('capital', '!=', false);
query_filter_not_eq.php
Unity
Query query = citiesRef.WhereNotEqualTo("capital", false);
Query query = citiesRef.WhereNotEqualTo("capital", false);
C#
// Snippet not yet available
Ruby
cities_ref = firestore.col collection_path
query = cities_ref.where "capital", "!=", false
query_data.rb

Kueri ini menampilkan setiap dokumen city yang memiliki kolom capital dan nilai kolom tersebut tidak sama dengan false atau null. Ini mencakup dokumen city yang memiliki kolom capital bernilai sama dengan true atau bernilai non-boolean apa pun selain null.

Kueri ini tidak menampilkan dokumen city yang tidak memiliki kolom capital. Kueri tidak sama dengan (!=) dan kueri not-in mengecualikan dokumen yang tidak memiliki kolom yang dimaksud.

Suatu kolom dianggap ada jika berisi nilai apa pun, termasuk string kosong (""), null, dan NaN (bukan angka). Perhatikan bahwa nilai kolom null tidak cocok dengan klausa !=, karena x != null bernilai undefined.

Batasan

Perhatikan batasan berikut untuk kueri !=:

  • Dokumen yang tidak memiliki kolom yang dimaksud tidak mungkin cocok dengan kueri.
  • Anda tidak dapat menggabungkan not-in dan != dalam kueri gabungan.
  • Pada kueri gabungan, perbandingan rentang (<, <=, >, >=) dan tidak sama dengan (!=, not-in) harus memfilter kolom yang sama.

Keanggotaan array

Anda dapat menggunakan operator array-contains untuk memfilter berdasarkan nilai array. Contoh:

Web version 9

import { query, where } from "firebase/firestore";
const q = query(citiesRef, where("regions", "array-contains", "west_coast"));
array_contains_filter.js

Web version 8

citiesRef.where("regions", "array-contains", "west_coast");
test.firestore.js
Swift
Catatan: Produk ini tidak tersedia di target watchOS dan App Clip. 
citiesRef
  .whereField("regions", arrayContains: "west_coast")
ViewController.swift
Objective-C
Catatan: Produk ini tidak tersedia di target watchOS dan App Clip. 
[citiesRef queryWhereField:@"state" arrayContains:@"west_coast"];
ViewController.m

Kotlin+KTX

val citiesRef = db.collection("cities")

citiesRef.whereArrayContains("regions", "west_coast")
DocSnippets.kt

Java

CollectionReference citiesRef = db.collection("cities");

citiesRef.whereArrayContains("regions", "west_coast");
DocSnippets.java

Dart

final citiesRef = db.collection("cities");
final westCoastcities =
    citiesRef.where("regions", arrayContains: "west_coast");
firestore.dart
Java
CollectionReference citiesRef = db.collection("cities");
Query westCoastQuery = citiesRef.whereArrayContains("regions", "west_coast");
QueryDataSnippets.java
Python
cities_ref = db.collection(u'cities')

query = cities_ref.where(u'regions', u'array_contains', u'west_coast')
snippets.py

Python

cities_ref = db.collection("cities")

query = cities_ref.where("regions", "array_contains", "west_coast")
snippets.py
C++
CollectionReference cities_ref = db->Collection("cities");

cities_ref.WhereArrayContains("region", FieldValue::String("west_coast"));
snippets.cpp
Node.js
const westCoastCities = citiesRef.where('regions', 'array-contains',
  'west_coast').get();
index.js
Go
query := cities.Where("regions", "array-contains", "west_coast").Documents(ctx)
query.go
PHP
$containsQuery = $citiesRef->where('regions', 'array-contains', 'west_coast');
query_filter_array_contains.php
Unity
CollectionReference citiesRef = db.Collection("cities");
Query arrayContainsQuery = citiesRef.WhereArrayContains("region", "west_coast");
C#
Query query = citiesRef.WhereArrayContains("Regions", "west_coast");
Program.cs
Ruby
cities_ref = firestore.col collection_path
cities = cities_ref.where "regions", "array-contains", "west_coast"
query_data.rb

Kueri ini menampilkan setiap dokumen city yang memiliki kolom regions berupa array yang berisi west_coast. Jika array memiliki beberapa instance dari nilai yang Anda tentukan dalam kueri, dokumen hanya akan dimasukkan sekali dalam hasil.

Anda dapat menggunakan maksimum satu klausa array-contains per kueri. Anda tidak dapat menggabungkan array-contains dengan array-contains-any.

in, not-in, dan array-contains-any

Gunakan operator in untuk menggabungkan beberapa klausa kesetaraan (==) di kolom yang sama dengan OR yang logis. Kueri in menampilkan dokumen yang memiliki kolom yang dimaksud dan nilai kolom tersebut sama dengan salah satu nilai perbandingan. Contoh:

Web version 9

import { query, where } from "firebase/firestore";

const q = query(citiesRef, where('country', 'in', ['USA', 'Japan']));
in_filter.js

Web version 8

citiesRef.where('country', 'in', ['USA', 'Japan']);
test.firestore.js
Swift
Catatan: Produk ini tidak tersedia di target watchOS dan App Clip. 
let citiesRef = db.collection("cities")

citiesRef.whereField("country", in: ["USA", "Japan"])
ViewController.swift
Objective-C
Catatan: Produk ini tidak tersedia di target watchOS dan App Clip. 
FIRCollectionReference *citiesRef = [self.db collectionWithPath:@"cities"];

[citiesRef queryWhereField:@"country" in:@[@"USA", @"Japan"]];
ViewController.m

Kotlin+KTX

val citiesRef = db.collection("cities")

citiesRef.whereIn("country", listOf("USA", "Japan"))
DocSnippets.kt

Java

CollectionReference citiesRef = db.collection("cities");

citiesRef.whereIn("country", Arrays.asList("USA", "Japan"));
DocSnippets.java

Dart

final citiesRef = db.collection("cities");
final cities = citiesRef.where("country", whereIn: ["USA", "Japan"]);
firestore.dart
Java
CollectionReference citiesRef = db.collection("cities");

Query query = citiesRef.whereIn("country", Arrays.asList("USA", "Japan"));
QueryDataSnippets.java
Python
cities_ref = db.collection(u'cities')

query = cities_ref.where(u'country', u'in', [u'USA', u'Japan'])
return query
snippets.py

Python

cities_ref = db.collection("cities")

query = cities_ref.where("country", "in", ["USA", "Japan"])
return query
snippets.py
C++
CollectionReference cities_ref = db->Collection("cities");

cities_ref.WhereIn("country", std::vector<FieldValue> {
  FieldValue::String("USA"),
  FieldValue::String("Japan")
});
snippets.cpp
Node.js
const usaOrJapan = await citiesRef.where('country', 'in', ['USA', 'Japan']).get();
index.js
Go
cities := client.Collection("cities")
query := cities.Where("country", "in", []string{"USA", "Japan"}).Documents(ctx)
query.go
PHP
$rangeQuery = $citiesRef->where('country', 'in', ['USA', 'Japan']);
query_filter_in.php
Unity
CollectionReference citiesRef = db.Collection("cities");
List countriesList = new List<object>() {"USA", "Japan"};

Query whereInQuery = citiesRef.WhereIn("country", countriesList);
C#
Query query = citiesRef.WhereIn("Country", new[] { "USA", "Japan" });
Program.cs
Ruby
cities_ref = firestore.col collection_path
usr_or_japan = cities_ref.where "country", "in", ["USA", "Japan"]
query_data.rb

Kueri ini menampilkan setiap dokumen city yang memiliki kolom country bernilai USA atau Japan. Dari contoh data, ini mencakup dokumen SF, LA, DC, dan TOK.

not-in

Gunakan operator not-in untuk menggabungkan hingga 10 klausa tidak sama dengan (!=) di kolom yang sama dengan AND yang logis. Kueri not-in menampilkan dokumen yang memiliki kolom yang dimaksud, dengan nilai kolom bukan null, dan tidak sama dengan salah satu nilai perbandingan. Contoh:

Web version 9

import { query, where } from "firebase/firestore";

const q = query(citiesRef, where('country', 'not-in', ['USA', 'Japan']));
not_in_filter.js

Web version 8

citiesRef.where('country', 'not-in', ['USA', 'Japan']);
test.firestore.js
Swift
Catatan: Produk ini tidak tersedia di target watchOS dan App Clip. 
citiesRef.whereField("country", notIn: ["USA", "Japan"])
ViewController.swift
Objective-C
Catatan: Produk ini tidak tersedia di target watchOS dan App Clip. 
[citiesRef queryWhereField:@"country" notIn:@[@"USA", @"Japan"]];
ViewController.m

Kotlin+KTX

citiesRef.whereNotIn("country", listOf("USA", "Japan"))
DocSnippets.kt

Java

citiesRef.whereNotIn("country", Arrays.asList("USA", "Japan"));
DocSnippets.java

Dart

final citiesRef = db.collection("cities");
final cities = citiesRef.where("country", whereNotIn: ["USA", "Japan"]);
firestore.dart
Java
CollectionReference citiesRef = db.collection("cities");

Query query = citiesRef.whereNotIn("country", Arrays.asList("USA", "Japan"));
QueryDataSnippets.java
Python
// Snippet not yet available
C++
cities_ref.WhereNotIn("country", std::vector<FieldValue> {
  FieldValue::String("USA"),
  FieldValue::String("Japan")
});
snippets.cpp
Node.js
const notUsaOrJapan = await citiesRef.where('country', 'not-in', ['USA', 'Japan']).get();
index.js
Go
// Snippet not yet available
PHP
$stateQuery = $citiesRef->where(
    'country',
    \Google\Cloud\Firestore\V1\StructuredQuery\FieldFilter\Operator::NOT_IN,
    ['USA', 'Japan']
);
query_filter_not_in.php
Unity
Query query = citiesRef.WhereNotIn(new FieldPath("country"), new List<string>{"USA", "Japan"});
Query query = citiesRef.WhereNotIn("country", new List<object>(){"USA", "Japan"});
C#
// Snippet not yet available
Ruby
cities_ref = firestore.col collection_path
usr_or_japan = cities_ref.where "country", "not_in", ["USA", "Japan"]
query_data.rb

Kueri ini menampilkan setiap dokumen city yang memiliki kolom country dan nilai kolom tersebut bukan USA, Japan, atau null. Dari contoh data, ini mencakup dokumen London dan Hong Kong.

Kueri not-in mengecualikan dokumen yang tidak memiliki kolom yang dimaksud. Suatu kolom dianggap ada jika berisi nilai apa pun, termasuk string kosong (""), null, dan NaN (bukan angka). Perhatikan bahwa x != null bernilai undefined. Kueri not-in yang menyertakan null sebagai salah satu nilai perbandingannya tidak cocok dengan dokumen mana pun.

array-contains-any

Gunakan operator array-contains-any untuk menggabungkan beberapa klausa array-contains di kolom yang sama dengan OR yang logis. Kueri array-contains-any menampilkan dokumen yang memiliki kolom yang dimaksud berupa array yang berisi satu atau beberapa nilai perbandingan:

Web version 9

import { query, where } from "firebase/firestore";

const q = query(citiesRef,
  where('regions', 'array-contains-any', ['west_coast', 'east_coast']));
array_contains_any_filter.js

Web version 8

citiesRef.where('regions', 'array-contains-any',
    ['west_coast', 'east_coast']);
test.firestore.js
Swift
Catatan: Produk ini tidak tersedia di target watchOS dan App Clip. 
let citiesRef = db.collection("cities")
citiesRef.whereField("regions", arrayContainsAny: ["west_coast", "east_coast"])
ViewController.swift
Objective-C
Catatan: Produk ini tidak tersedia di target watchOS dan App Clip. 
FIRCollectionReference *citiesRef = [self.db collectionWithPath:@"cities"];

[citiesRef queryWhereField:@"regions" arrayContainsAny:@[@"west_coast", @"east_coast"]];
ViewController.m

Kotlin+KTX

val citiesRef = db.collection("cities")

citiesRef.whereArrayContainsAny("regions", listOf("west_coast", "east_coast"))
DocSnippets.kt

Java

CollectionReference citiesRef = db.collection("cities");

citiesRef.whereArrayContainsAny("regions", Arrays.asList("west_coast", "east_coast"));
DocSnippets.java

Dart

final citiesRef = db.collection("cities");
final cities = citiesRef
    .where("regions", arrayContainsAny: ["west_coast", "east_coast"]);
firestore.dart
Java
CollectionReference citiesRef = db.collection("cities");

Query query =
    citiesRef.whereArrayContainsAny("regions", Arrays.asList("west_coast", "east_coast"));
QueryDataSnippets.java
Python
cities_ref = db.collection(u'cities')

query = cities_ref.where(
    u'regions', u'array_contains_any', [u'west_coast', u'east_coast']
)
return query
snippets.py

Python

cities_ref = db.collection("cities")

query = cities_ref.where(
    "regions", "array_contains_any", ["west_coast", "east_coast"]
)
return query
snippets.py
C++
CollectionReference cities_ref = db->Collection("cities");

cities_ref.WhereArrayContainsAny("region", std::vector<FieldValue> {
  FieldValue::String("west_coast"),
  FieldValue::String("east_coast")
});
snippets.cpp
Node.js
const coastalCities = await citiesRef.where('regions', 'array-contains-any',
    ['west_coast', 'east_coast']).get();
index.js
Go
cities := client.Collection("cities")
query := cities.Where("regions", "array-contains-any", []string{"west_coast", "east_coast"}).Documents(ctx)
query.go
PHP
$containsQuery = $citiesRef->where('regions', 'array-contains-any', ['west_coast', 'east_coast']);
query_filter_array_contains_any.php
Unity
Query query = citiesRef.WhereArrayContainsAny(
                         "regions",
                         new List<object>()
                         {
                            new List<object>(){"west_coast"},
                            new List<object>(){"east_coast"}});
C#
Query query = citiesRef.WhereArrayContainsAny("Regions", new[] { "west_coast", "east_coast" });
Program.cs
Ruby
cities_ref = firestore.col collection_path
costal_cities = cities_ref.where "regions", "array-contains-any", ["west_coast", "east_coast"]
query_data.rb

Kueri ini menampilkan setiap dokumen kota yang memiliki kolom regions berupa array yang berisi west_coast atau east_coast. Dari contoh data, ini mencakup dokumen SF, LA, dan DC.

Hasil dari array-contains-any akan dihapus duplikatnya. Meskipun kolom array dokumen cocok dengan lebih dari satu nilai perbandingan, kumpulan hasilnya hanya akan menyertakan dokumen tersebut sekali.

array-contains-any selalu memfilter berdasarkan jenis data array. Misalnya, kueri di atas tidak akan menampilkan dokumen kota jika kolom regions bukan berupa array, melainkan string west_coast.

Anda dapat menggunakan nilai array sebagai nilai perbandingan untuk in, tetapi klausanya akan dicocokkan menurut pencocokan persis panjang, urutan, dan nilai array. Ini berbeda dari array-contains-any. Contoh:

Web version 9

import { query, where } from "firebase/firestore";

const q = query(citiesRef, where('regions', 'in', [['west_coast', 'east_coast']]));
in_filter_with_array.js

Web version 8

citiesRef.where('regions', 'in',
    [['west_coast', 'east_coast']]);
test.firestore.js
Swift
Catatan: Produk ini tidak tersedia di target watchOS dan App Clip. 
citiesRef.whereField("regions", in: [["west_coast"], ["east_coast"]]);
ViewController.swift
Objective-C
Catatan: Produk ini tidak tersedia di target watchOS dan App Clip. 
[citiesRef queryWhereField:@"regions" in:@[@[@"west_coast"], @[@"east_coast"]]];
ViewController.m

Kotlin+KTX

citiesRef.whereIn("regions", listOf(arrayOf("west_coast"), arrayOf("east_coast")))
DocSnippets.kt

Java

citiesRef.whereIn("regions", Arrays.asList(new String[]{"west_coast"}, new String[]{"east_coast"}));
DocSnippets.java

Dart

final citiesRef = db.collection("cities");
final cities = citiesRef.where("regions", whereIn: [
  ["west_coast"],
  ["east_coast"]
]);
firestore.dart
Java
CollectionReference citiesRef = db.collection("cities");

Query query =
    citiesRef.whereIn(
        "regions", Arrays.asList(Arrays.asList("west_coast"), Arrays.asList("east_coast")));
QueryDataSnippets.java
Python
cities_ref = db.collection(u'cities')

query = cities_ref.where(
    u'regions', u'in', [[u'west_coast'], [u'east_coast']]
)
return query
snippets.py

Python

cities_ref = db.collection("cities")

query = cities_ref.where("regions", "in", [["west_coast"], ["east_coast"]])
return query
snippets.py
C++
cities_ref.WhereIn("region", std::vector<FieldValue> {
  FieldValue::String("west_coast"),
  FieldValue::String("east_coast")
});
snippets.cpp
Node.js
const exactlyOneCoast = await citiesRef.where('regions', 'in',
    [['west_coast', 'east_coast']]).get();
index.js
Go
cities := client.Collection("cities")
query := cities.Where("regions", "in", [][]string{{"west_coast"}, {"east_coast"}}).Documents(ctx)
query.go
PHP
$rangeQuery = $citiesRef->where('regions', 'in', [['west_coast'], ['east_coast']]);
query_filter_in_with_array.php
Unity
// Not yet supported in the Unity SDK
C#
Query query = citiesRef.WhereIn("Regions",
    new[] { new[] { "west_coast" }, new[] { "east_coast" } });
Program.cs
Ruby
cities_ref = firestore.col collection_path
exactly_one_cost = cities_ref.where "regions", "in", [["west_coast"], ["east_coast"]]
query_data.rb

Kueri ini menampilkan setiap dokumen kota yang memiliki kolom regions berupa array yang berisi tepat satu elemen west_coast atau east_coast. Dari contoh data, hanya dokumen DC yang memenuhi syarat karena memiliki kolom regions berisi ["east_coast"]. Dokumen SF tidak cocok karena kolom regions-nya berisi ["west_coast", "norcal"].

Batasan

Perhatikan batasan berikut untuk in, not-in, dan array-contains-any:

  • Cloud Firestore menyediakan dukungan untuk kueri OR yang logis melalui operator or, in, dan array-contains-any. Kueri ini terbatas pada 30 disjungsi berdasarkan bentuk normal disjungtif kueri.
  • Anda dapat menggunakan maksimum satu klausa array-contains per disjungsi (grup or). Anda tidak dapat menggabungkan array-contains dengan array-contains-any dalam disjungsi yang sama.
  • Anda tidak dapat menggabungkan not-in dengan tidak sama dengan !=.
  • not-in mendukung hingga 10 nilai perbandingan.
  • Anda tidak dapat mengurutkan kueri berdasarkan kolom yang disertakan dalam klausa kesetaraan (==) atau in.

Kueri (AND)gabungan

Anda dapat menggabungkan batasan dengan AND yang logis dengan menggabungkan beberapa operator kesetaraan (== atau array-contains). Namun, Anda harus membuat indeks komposit untuk menggabungkan operator kesetaraan dengan operator ketidaksetaraan, <, <=, >, dan != Google.

Web version 9

import { query, where } from "firebase/firestore";

const q1 = query(citiesRef, where("state", "==", "CO"), where("name", "==", "Denver"));
const q2 = query(citiesRef, where("state", "==", "CA"), where("population", "<", 1000000));
chain_filters.js

Web version 8

const q1 = citiesRef.where("state", "==", "CO").where("name", "==", "Denver");
const q2 = citiesRef.where("state", "==", "CA").where("population", "<", 1000000);
test.firestore.js
Swift
Catatan: Produk ini tidak tersedia di target watchOS dan App Clip. 
citiesRef
    .whereField("state", isEqualTo: "CO")
    .whereField("name", isEqualTo: "Denver")
citiesRef
    .whereField("state", isEqualTo: "CA")
    .whereField("population", isLessThan: 1000000)
ViewController.swift
Objective-C
Catatan: Produk ini tidak tersedia di target watchOS dan App Clip. 
[[citiesRef queryWhereField:@"state" isEqualTo:@"CO"]
    queryWhereField:@"name" isGreaterThanOrEqualTo:@"Denver"];
[[citiesRef queryWhereField:@"state" isEqualTo:@"CA"]
    queryWhereField:@"population" isLessThan:@1000000];
ViewController.m

Kotlin+KTX

citiesRef.whereEqualTo("state", "CO").whereEqualTo("name", "Denver")
citiesRef.whereEqualTo("state", "CA").whereLessThan("population", 1000000)
DocSnippets.kt

Java

citiesRef.whereEqualTo("state", "CO").whereEqualTo("name", "Denver");
citiesRef.whereEqualTo("state", "CA").whereLessThan("population", 1000000);
DocSnippets.java

Dart

final citiesRef = db.collection("cities");
citiesRef
    .where("state", isEqualTo: "CO")
    .where("name", isEqualTo: "Denver");
citiesRef
    .where("state", isEqualTo: "CA")
    .where("population", isLessThan: 1000000);
firestore.dart
Java
Query chainedQuery1 = cities.whereEqualTo("state", "CO").whereEqualTo("name", "Denver");
QueryDataSnippets.java
Python
cities_ref = db.collection(u'cities')

denver_query = cities_ref.where(
    u'state', u'==', u'CO').where(u'name', u'==', u'Denver')
large_us_cities_query = cities_ref.where(
    u'state', u'==', u'CA').where(u'population', u'>', 1000000)
snippets.py

Python

cities_ref = db.collection("cities")

denver_query = cities_ref.where("state", "==", "CO").where("name", "==", "Denver")
large_us_cities_query = cities_ref.where("state", "==", "CA").where(
    "population", ">", 1000000
)
snippets.py
C++
cities_ref.WhereEqualTo("state", FieldValue::String("CO"))
    .WhereEqualTo("name", FieldValue::String("Denver"));
cities_ref.WhereEqualTo("state", FieldValue::String("CA"))
    .WhereLessThan("population", FieldValue::Integer(1000000));
snippets.cpp
Node.js
citiesRef.where('state', '==', 'CO').where('name', '==', 'Denver');
citiesRef.where('state', '==', 'CA').where('population', '<', 1000000);
index.js
Go
denverQuery := cities.Where("name", "==", "Denver").Where("state", "==", "CO")
caliQuery := cities.Where("state", "==", "CA").Where("population", "<=", 1000000)
query := cities.Where("country", "==", "USA").Where("population", ">", 5000000)
query.go
PHP
$chainedQuery = $citiesRef
    ->where('state', '=', 'CA')
    ->where('name', '=', 'San Francisco');
query_filter_compound_multi_eq.php
Unity
Query chainedQuery = citiesRef
    .WhereEqualTo("State", "CA")
    .WhereEqualTo("Name", "San Francisco");
C#
Query chainedQuery = citiesRef
    .WhereEqualTo("State", "CA")
    .WhereEqualTo("Name", "San Francisco");
Program.cs
Ruby
chained_query = cities_ref.where("state", "=", "CA").where("name", "=", "San Francisco")
query_data.rb

Anda dapat melakukan perbandingan rentang (<, <=, >, >=) atau tidak sama dengan (!=) hanya di satu kolom, dan Anda dapat menyertakan maksimal satu klausa array-contains atau array-contains-any pada kueri gabungan:

Valid: Filter rentang berada pada satu kolom saja

Web version 9

import { query, where } from "firebase/firestore";

const q1 = query(citiesRef, where("state", ">=", "CA"), where("state", "<=", "IN"));
const q2 = query(citiesRef, where("state", "==", "CA"), where("population", ">", 1000000));
valid_range_filters.js

Web version 8

const q1 = citiesRef.where("state", ">=", "CA").where("state", "<=", "IN");
const q2 = citiesRef.where("state", "==", "CA").where("population", ">", 1000000);
test.firestore.js
Swift
Catatan: Produk ini tidak tersedia di target watchOS dan App Clip. 
citiesRef
    .whereField("state", isGreaterThanOrEqualTo: "CA")
    .whereField("state", isLessThanOrEqualTo: "IN")
citiesRef
    .whereField("state", isEqualTo: "CA")
    .whereField("population", isGreaterThan: 1000000)
ViewController.swift
Objective-C
Catatan: Produk ini tidak tersedia di target watchOS dan App Clip. 
[[citiesRef queryWhereField:@"state" isGreaterThanOrEqualTo:@"CA"]
    queryWhereField:@"state" isLessThanOrEqualTo:@"IN"];
[[citiesRef queryWhereField:@"state" isEqualTo:@"CA"]
    queryWhereField:@"population" isGreaterThan:@1000000];
ViewController.m

Kotlin+KTX

citiesRef.whereGreaterThanOrEqualTo("state", "CA")
    .whereLessThanOrEqualTo("state", "IN")
citiesRef.whereEqualTo("state", "CA")
    .whereGreaterThan("population", 1000000)
DocSnippets.kt

Java

citiesRef.whereGreaterThanOrEqualTo("state", "CA")
        .whereLessThanOrEqualTo("state", "IN");
citiesRef.whereEqualTo("state", "CA")
        .whereGreaterThan("population", 1000000);
DocSnippets.java

Dart

final citiesRef = db.collection("cities");
citiesRef
    .where("state", isGreaterThanOrEqualTo: "CA")
    .where("state", isLessThanOrEqualTo: "IN");
citiesRef
    .where("state", isEqualTo: "CA")
    .where("population", isGreaterThan: 1000000);
firestore.dart
Java
Query validQuery1 =
    cities.whereGreaterThanOrEqualTo("state", "CA").whereLessThanOrEqualTo("state", "IN");
Query validQuery2 = cities.whereEqualTo("state", "CA").whereGreaterThan("population", 1000000);
QueryDataSnippets.java
Python
cities_ref = db.collection(u'cities')
cities_ref.where(u'state', u'>=', u'CA').where(u'state', u'<=', u'IN')
snippets.py

Python

cities_ref = db.collection("cities")
cities_ref.where("state", ">=", "CA").where("state", "<=", "IN")
snippets.py
C++
cities_ref.WhereGreaterThanOrEqualTo("state", FieldValue::String("CA"))
    .WhereLessThanOrEqualTo("state", FieldValue::String("IN"));
cities_ref.WhereEqualTo("state", FieldValue::String("CA"))
    .WhereGreaterThan("population", FieldValue::Integer(1000000));
snippets.cpp
Node.js
citiesRef.where('state', '>=', 'CA').where('state', '<=', 'IN');
citiesRef.where('state', '==', 'CA').where('population', '>', 1000000);
index.js
Go
stateQuery := cities.Where("state", ">=", "CA").Where("state", "<", "IN")
populationQuery := cities.Where("state", "==", "CA").Where("population", ">", 1000000)
query.go
PHP
$rangeQuery = $citiesRef
    ->where('state', '>=', 'CA')
    ->where('state', '<=', 'IN');
query_filter_range_valid.php
Unity
Query rangeQuery = citiesRef
    .WhereGreaterThanOrEqualTo("State", "CA")
    .WhereLessThanOrEqualTo("State", "IN");
C#
Query rangeQuery = citiesRef
    .WhereGreaterThanOrEqualTo("State", "CA")
    .WhereLessThanOrEqualTo("State", "IN");
Program.cs
Ruby
range_query = cities_ref.where("state", ">=", "CA").where("state", "<=", "IN")
query_data.rb

Tidak valid: Filter rentang berada pada kolom berbeda

Web version 9

import { query, where } from "firebase/firestore";

const q = query(citiesRef, where("state", ">=", "CA"), where("population", ">", 100000));
invalid_range_filters.js

Web version 8

citiesRef.where("state", ">=", "CA").where("population", ">", 100000);
test.firestore.js
Swift
Catatan: Produk ini tidak tersedia di target watchOS dan App Clip.
Catatan: Produk ini tidak tersedia di target watchOS dan App Clip. 
citiesRef
    .whereField("state", isGreaterThanOrEqualTo: "CA")
    .whereField("population", isGreaterThan: 1000000)
ViewController.swift
Objective-C
Catatan: Produk ini tidak tersedia di target watchOS dan App Clip. 
[[citiesRef queryWhereField:@"state" isGreaterThanOrEqualTo:@"CA"]
    queryWhereField:@"population" isGreaterThan:@1000000];
ViewController.m

Kotlin+KTX

citiesRef.whereGreaterThanOrEqualTo("state", "CA")
    .whereGreaterThan("population", 100000)
DocSnippets.kt

Java

citiesRef.whereGreaterThanOrEqualTo("state", "CA").whereGreaterThan("population", 100000);
DocSnippets.java

Dart

final citiesRef = db.collection("cities");
citiesRef
    .where("state", isGreaterThanOrEqualTo: "CA")
    .where("population", isGreaterThan: 1000000);
firestore.dart
Java
Query invalidRangeQuery =
    cities.whereGreaterThanOrEqualTo("state", "CA").whereGreaterThan("population", 100000);
QueryDataSnippets.java
Python
cities_ref = db.collection(u'cities')
cities_ref.where(
    u'state', u'>=', u'CA').where(u'population', u'>=', 1000000)
snippets.py

Python

cities_ref = db.collection("cities")
cities_ref.where("state", ">=", "CA").where("population", ">=", 1000000)
snippets.py
C++
// BAD EXAMPLE -- will crash the program:
cities_ref.WhereGreaterThanOrEqualTo("state", FieldValue::String("CA"))
    .WhereGreaterThan("population", FieldValue::Integer(100000));
snippets.cpp
Node.js
citiesRef.where('state', '>=', 'CA').where('population', '>', 1000000);
index.js
Go
query := cities.Where("state", ">=", "CA").Where("population", ">", 1000000)
query.go
PHP
$invalidRangeQuery = $citiesRef
    ->where('state', '>=', 'CA')
    ->where('population', '>', 1000000);
query_filter_range_invalid.php
Unity
Query invalidRangeQuery = citiesRef
    .WhereGreaterThanOrEqualTo("State", "CA")
    .WhereGreaterThan("Population", 1000000);
C#
Query invalidRangeQuery = citiesRef
    .WhereGreaterThanOrEqualTo("State", "CA")
    .WhereGreaterThan("Population", 1000000);
Program.cs
Ruby
invalid_range_query = cities_ref.where("state", ">=", "CA").where("population", ">", 1_000_000)
query_data.rb

OR kueri

Anda dapat menggabungkan batasan dengan OR yang logis. Contoh:

Web version 9

const q = query(citiesRef,
  or(where('capital', '==', true),
     where('population', '>=', 1000000)
  )
);

Web version 8

Tidak tersedia.

Swift
let query = db.collection("cities").whereFilter(Filter.orFilter([
                Filter.whereField("capital", isEqualTo: true),
                Filter.whereField("population", isGreaterThanOrEqualTo: 1000000);
            ]))
Objective-C
  FIRCollectionReference *collection = [self.db collectionWithPath:@"cities"];
  FIRQuery *query = [collection queryWhereFilter:[FIRFilter orFilterWithFilters:@[
      [FIRFilter filterWhereField:@"capital" isEqualTo:@YES],
      [FIRFilter filterWhereField:@"population" isGreaterThanOrEqualTo:@1000000]
  ]]];

Kotlin+KTX

val query = collection.where(Filter.or(
        Filter.equalTo("capital", true),
        Filter.greaterThanOrEqualTo("population", 1000000)
))

Java

Query query = collection.where(Filter.or(
        Filter.equalTo("capital", true),
        Filter.greaterThanOrEqualTo("population", 1000000)
));

Dart

Cuplikan tidak tersedia.

Java

Cuplikan tidak tersedia.

Python

Cuplikan tidak tersedia.

Python

Cuplikan tidak tersedia.

C++

Cuplikan tidak tersedia.

Node.js

Cuplikan tidak tersedia.

Go

Cuplikan tidak tersedia.

PHP

Cuplikan tidak tersedia.

Unity

Cuplikan tidak tersedia.

C#

Cuplikan tidak tersedia.

Ruby

Cuplikan tidak tersedia.

Cloud Firestore menggunakan indeks komposit untuk menyalurkan kueri OR. Jika indeks Anda tidak mendukung kueri, Cloud Firestore menyarankan indeks tambahan untuk database Anda.

Anda dapat menggabungkan kueri OR dengan kueri gabungan untuk memfilter kombinasi operasi OR dan AND. Contoh:

Web version 9

const q = query(collection(db, "cities"), and(
  where('state', '==', 'CA'),
  or(
    where('capital', '==', true),
    where('population', '>=', 1000000)
  )
));
test.firestore.js

Web version 8

Tidak tersedia.

Swift
Catatan: Produk ini tidak tersedia di target watchOS dan App Clip. 
let query = db.collection("cities").whereFilter(Filter.andFilter([
    Filter.whereField("state", isEqualTo: "CA"),
    Filter.orFilter([
        Filter.whereField("capital", isEqualTo: true),
        Filter.whereField("population", isGreaterThanOrEqualTo: 1000000);
    ])
]))
ViewController.swift
Objective-C
Catatan: Produk ini tidak tersedia di target watchOS dan App Clip. 
FIRCollectionReference *collection = [self.db collectionWithPath:@"cities"];
FIRQuery *query = [collection queryWhereFilter:[FIRFilter andFilterWithFilters:@[
  [FIRFilter filterWhereField:@"state" isEqualTo:@"CA"],
  [FIRFilter orFilterWithFilters:@[
    [FIRFilter filterWhereField:@"capital" isEqualTo:@YES],
    [FIRFilter filterWhereField:@"population" isGreaterThanOrEqualTo:@1000000]
  ]]
]]];
ViewController.m

Kotlin+KTX

val query = collection.where(Filter.and(
    Filter.equalTo("state", "CA"),
    Filter.or(
        Filter.equalTo("capital", true),
        Filter.greaterThanOrEqualTo("population", 1000000)
    )
))
DocSnippets.kt

Java

Query query = collection.where(Filter.and(
    Filter.equalTo("state", "CA"),
    Filter.or(
        Filter.equalTo("capital", true),
        Filter.greaterThanOrEqualTo("population", 1000000)
    )
));
DocSnippets.java

Dart

Cuplikan tidak tersedia.

Java

Cuplikan tidak tersedia.

Python

Cuplikan tidak tersedia.

Python

Cuplikan tidak tersedia.

C++

Cuplikan tidak tersedia.

Node.js

Cuplikan tidak tersedia.

Go

Cuplikan tidak tersedia.

PHP

Cuplikan tidak tersedia.

Unity

Cuplikan tidak tersedia.

C#

Cuplikan tidak tersedia.

Ruby

Cuplikan tidak tersedia.

Batasan

Perhatikan batasan berikut untuk kueri or:

  • Cloud Firestore membatasi kueri hingga maksimum 30 disjungsi berdasarkan bentuk normal disjungtif kueri. Anda mungkin akan mencapai batas ini saat melakukan AND pada beberapa grup OR.
  • Anda tidak dapat menggabungkan not-in dengan in, array-contains-any, atau or dalam kueri yang sama.
  • Anda tidak boleh memiliki kesetaraan (==) dan ketidaksetaraan (<, <=, >, dan !=) di kolom yang sama di seluruh disjungsi (or, in, array-contains-any).

Untuk deskripsi lengkap tentang batasan, lihat Batasan kueri.

Kueri grup koleksi

Grup koleksi terdiri dari semua koleksi dengan ID yang sama. Secara default, kueri mengambil hasil dari satu koleksi di database Anda. Gunakan kueri grup koleksi untuk mengambil dokumen dari grup koleksi, bukan dari satu koleksi.

Misalnya, Anda dapat membuat grup koleksi landmarks dengan menambahkan subkoleksi tempat terkenal ke setiap kota:

Web version 9

import { collection, addDoc } from "firebase/firestore";

const citiesRef = collection(db, 'cities');

await Promise.all([
    addDoc(collection(citiesRef, 'SF', 'landmarks'), {
        name: 'Golden Gate Bridge',
        type: 'bridge'
    }),
    addDoc(collection(citiesRef, 'SF', 'landmarks'), {
        name: 'Legion of Honor',
        type: 'museum'
    }),
    addDoc(collection(citiesRef, 'LA', 'landmarks'), {
        name: 'Griffith Park',
        type: 'park'
    }),
    addDoc(collection(citiesRef, 'LA', 'landmarks'), {
        name: 'The Getty',
        type: 'museum'
    }),
    addDoc(collection(citiesRef, 'DC', 'landmarks'), {
        name: 'Lincoln Memorial',
        type: 'memorial'
    }),
    addDoc(collection(citiesRef, 'DC', 'landmarks'), {
        name: 'National Air and Space Museum',
        type: 'museum'
    }),
    addDoc(collection(citiesRef, 'TOK', 'landmarks'), {
        name: 'Ueno Park',
        type: 'park'
    }),
    addDoc(collection(citiesRef, 'TOK', 'landmarks'), {
        name: 'National Museum of Nature and Science',
        type: 'museum'
    }),
    addDoc(collection(citiesRef, 'BJ', 'landmarks'), {
        name: 'Jingshan Park',
        type: 'park'
    }),
    addDoc(collection(citiesRef, 'BJ', 'landmarks'), {
        name: 'Beijing Ancient Observatory',
        type: 'museum'
    })
]);
fs_collection_group_query_data_setup.js

Web version 8

var citiesRef = db.collection('cities');

var landmarks = Promise.all([
    citiesRef.doc('SF').collection('landmarks').doc().set({
        name: 'Golden Gate Bridge',
        type: 'bridge'
    }),
    citiesRef.doc('SF').collection('landmarks').doc().set({
        name: 'Legion of Honor',
        type: 'museum'
    }),
    citiesRef.doc('LA').collection('landmarks').doc().set({
        name: 'Griffith Park',
        type: 'park'
    }),
    citiesRef.doc('LA').collection('landmarks').doc().set({
        name: 'The Getty',
        type: 'museum'
    }),
    citiesRef.doc('DC').collection('landmarks').doc().set({
        name: 'Lincoln Memorial',
        type: 'memorial'
    }),
    citiesRef.doc('DC').collection('landmarks').doc().set({
        name: 'National Air and Space Museum',
        type: 'museum'
    }),
    citiesRef.doc('TOK').collection('landmarks').doc().set({
        name: 'Ueno Park',
        type: 'park'
    }),
    citiesRef.doc('TOK').collection('landmarks').doc().set({
        name: 'National Museum of Nature and Science',
        type: 'museum'
    }),
    citiesRef.doc('BJ').collection('landmarks').doc().set({
        name: 'Jingshan Park',
        type: 'park'
    }),
    citiesRef.doc('BJ').collection('landmarks').doc().set({
        name: 'Beijing Ancient Observatory',
        type: 'museum'
    })
]);
test.firestore.js
Swift
Catatan: Produk ini tidak tersedia di target watchOS dan App Clip. 
let citiesRef = db.collection("cities")

var data = ["name": "Golden Gate Bridge", "type": "bridge"]
citiesRef.document("SF").collection("landmarks").addDocument(data: data)

data = ["name": "Legion of Honor", "type": "museum"]
citiesRef.document("SF").collection("landmarks").addDocument(data: data)

data = ["name": "Griffith Park", "type": "park"]
citiesRef.document("LA").collection("landmarks").addDocument(data: data)

data = ["name": "The Getty", "type": "museum"]
citiesRef.document("LA").collection("landmarks").addDocument(data: data)

data = ["name": "Lincoln Memorial", "type": "memorial"]
citiesRef.document("DC").collection("landmarks").addDocument(data: data)

data = ["name": "National Air and Space Museum", "type": "museum"]
citiesRef.document("DC").collection("landmarks").addDocument(data: data)

data = ["name": "Ueno Park", "type": "park"]
citiesRef.document("TOK").collection("landmarks").addDocument(data: data)

data = ["name": "National Museum of Nature and Science", "type": "museum"]
citiesRef.document("TOK").collection("landmarks").addDocument(data: data)

data = ["name": "Jingshan Park", "type": "park"]
citiesRef.document("BJ").collection("landmarks").addDocument(data: data)

data = ["name": "Beijing Ancient Observatory", "type": "museum"]
citiesRef.document("BJ").collection("landmarks").addDocument(data: data)
ViewController.swift
Objective-C
Catatan: Produk ini tidak tersedia di target watchOS dan App Clip. 
FIRCollectionReference *citiesRef = [self.db collectionWithPath:@"cities"];

NSDictionary *data = @{@"name": @"Golden Gate Bridge", @"type": @"bridge"};
[[[citiesRef documentWithPath:@"SF"] collectionWithPath:@"landmarks"] addDocumentWithData:data];

data = @{@"name": @"Legion of Honor", @"type": @"museum"};
[[[citiesRef documentWithPath:@"SF"] collectionWithPath:@"landmarks"] addDocumentWithData:data];

data = @{@"name": @"Griffith Park", @"type": @"park"};
[[[citiesRef documentWithPath:@"LA"] collectionWithPath:@"landmarks"] addDocumentWithData:data];

data = @{@"name": @"The Getty", @"type": @"museum"};
[[[citiesRef documentWithPath:@"LA"] collectionWithPath:@"landmarks"] addDocumentWithData:data];

data = @{@"name": @"Lincoln Memorial", @"type": @"memorial"};
[[[citiesRef documentWithPath:@"DC"] collectionWithPath:@"landmarks"] addDocumentWithData:data];

data = @{@"name": @"National Air and Space Museum", @"type": @"museum"};
[[[citiesRef documentWithPath:@"DC"] collectionWithPath:@"landmarks"] addDocumentWithData:data];

data = @{@"name": @"Ueno Park", @"type": @"park"};
[[[citiesRef documentWithPath:@"TOK"] collectionWithPath:@"landmarks"] addDocumentWithData:data];

data = @{@"name": @"National Museum of Nature and Science", @"type": @"museum"};
[[[citiesRef documentWithPath:@"TOK"] collectionWithPath:@"landmarks"] addDocumentWithData:data];

data = @{@"name": @"Jingshan Park", @"type": @"park"};
[[[citiesRef documentWithPath:@"BJ"] collectionWithPath:@"landmarks"] addDocumentWithData:data];

data = @{@"name": @"Beijing Ancient Observatory", @"type": @"museum"};
[[[citiesRef documentWithPath:@"BJ"] collectionWithPath:@"landmarks"] addDocumentWithData:data];
ViewController.m

Kotlin+KTX

val citiesRef = db.collection("cities")

val ggbData = mapOf(
    "name" to "Golden Gate Bridge",
    "type" to "bridge",
)
citiesRef.document("SF").collection("landmarks").add(ggbData)

val lohData = mapOf(
    "name" to "Legion of Honor",
    "type" to "museum",
)
citiesRef.document("SF").collection("landmarks").add(lohData)

val gpData = mapOf(
    "name" to "Griffth Park",
    "type" to "park",
)
citiesRef.document("LA").collection("landmarks").add(gpData)

val tgData = mapOf(
    "name" to "The Getty",
    "type" to "museum",
)
citiesRef.document("LA").collection("landmarks").add(tgData)

val lmData = mapOf(
    "name" to "Lincoln Memorial",
    "type" to "memorial",
)
citiesRef.document("DC").collection("landmarks").add(lmData)

val nasaData = mapOf(
    "name" to "National Air and Space Museum",
    "type" to "museum",
)
citiesRef.document("DC").collection("landmarks").add(nasaData)

val upData = mapOf(
    "name" to "Ueno Park",
    "type" to "park",
)
citiesRef.document("TOK").collection("landmarks").add(upData)

val nmData = mapOf(
    "name" to "National Musuem of Nature and Science",
    "type" to "museum",
)
citiesRef.document("TOK").collection("landmarks").add(nmData)

val jpData = mapOf(
    "name" to "Jingshan Park",
    "type" to "park",
)
citiesRef.document("BJ").collection("landmarks").add(jpData)

val baoData = mapOf(
    "name" to "Beijing Ancient Observatory",
    "type" to "musuem",
)
citiesRef.document("BJ").collection("landmarks").add(baoData)
DocSnippets.kt

Java

CollectionReference citiesRef = db.collection("cities");

Map<String, Object> ggbData = new HashMap<>();
ggbData.put("name", "Golden Gate Bridge");
ggbData.put("type", "bridge");
citiesRef.document("SF").collection("landmarks").add(ggbData);

Map<String, Object> lohData = new HashMap<>();
lohData.put("name", "Legion of Honor");
lohData.put("type", "museum");
citiesRef.document("SF").collection("landmarks").add(lohData);

Map<String, Object> gpData = new HashMap<>();
gpData.put("name", "Griffith Park");
gpData.put("type", "park");
citiesRef.document("LA").collection("landmarks").add(gpData);

Map<String, Object> tgData = new HashMap<>();
tgData.put("name", "The Getty");
tgData.put("type", "museum");
citiesRef.document("LA").collection("landmarks").add(tgData);

Map<String, Object> lmData = new HashMap<>();
lmData.put("name", "Lincoln Memorial");
lmData.put("type", "memorial");
citiesRef.document("DC").collection("landmarks").add(lmData);

Map<String, Object> nasaData = new HashMap<>();
nasaData.put("name", "National Air and Space Museum");
nasaData.put("type", "museum");
citiesRef.document("DC").collection("landmarks").add(nasaData);

Map<String, Object> upData = new HashMap<>();
upData.put("name", "Ueno Park");
upData.put("type", "park");
citiesRef.document("TOK").collection("landmarks").add(upData);

Map<String, Object> nmData = new HashMap<>();
nmData.put("name", "National Museum of Nature and Science");
nmData.put("type", "museum");
citiesRef.document("TOK").collection("landmarks").add(nmData);

Map<String, Object> jpData = new HashMap<>();
jpData.put("name", "Jingshan Park");
jpData.put("type", "park");
citiesRef.document("BJ").collection("landmarks").add(jpData);

Map<String, Object> baoData = new HashMap<>();
baoData.put("name", "Beijing Ancient Observatory");
baoData.put("type", "museum");
citiesRef.document("BJ").collection("landmarks").add(baoData);
DocSnippets.java

Dart

final citiesRef = db.collection("cities");

final ggbData = {"name": "Golden Gate Bridge", "type": "bridge"};
citiesRef.doc("SF").collection("landmarks").add(ggbData);

final lohData = {"name": "Legion of Honor", "type": "museum"};
citiesRef.doc("SF").collection("landmarks").add(lohData);

final gpData = {"name": "Griffth Park", "type": "park"};
citiesRef.doc("LA").collection("landmarks").add(gpData);

final tgData = {"name": "The Getty", "type": "museum"};
citiesRef.doc("LA").collection("landmarks").add(tgData);

final lmData = {"name": "Lincoln Memorial", "type": "memorial"};
citiesRef.doc("DC").collection("landmarks").add(lmData);

final nasaData = {
  "name": "National Air and Space Museum",
  "type": "museum"
};
citiesRef.doc("DC").collection("landmarks").add(nasaData);

final upData = {"name": "Ueno Park", "type": "park"};
citiesRef.doc("TOK").collection("landmarks").add(upData);

final nmData = {
  "name": "National Musuem of Nature and Science",
  "type": "museum"
};
citiesRef.doc("TOK").collection("landmarks").add(nmData);

final jpData = {"name": "Jingshan Park", "type": "park"};
citiesRef.doc("BJ").collection("landmarks").add(jpData);

final baoData = {"name": "Beijing Ancient Observatory", "type": "musuem"};
citiesRef.doc("BJ").collection("landmarks").add(baoData);
firestore.dart
Java
CollectionReference cities = db.collection("cities");

final List<ApiFuture<WriteResult>> futures =
    Arrays.asList(
        cities
            .document("SF")
            .collection("landmarks")
            .document()
            .set(
                new HashMap<String, String>() {
                  {
                    put("name", "Golden Gate Bridge");
                    put("type", "bridge");
                  }
                }),
        cities
            .document("SF")
            .collection("landmarks")
            .document()
            .set(
                new HashMap<String, String>() {
                  {
                    put("name", "Legion of Honor");
                    put("type", "museum");
                  }
                }),
        cities
            .document("LA")
            .collection("landmarks")
            .document()
            .set(
                new HashMap<String, String>() {
                  {
                    put("name", "Griffith Park");
                    put("type", "park");
                  }
                }),
        cities
            .document("LA")
            .collection("landmarks")
            .document()
            .set(
                new HashMap<String, String>() {
                  {
                    put("name", "The Getty");
                    put("type", "museum");
                  }
                }),
        cities
            .document("DC")
            .collection("landmarks")
            .document()
            .set(
                new HashMap<String, String>() {
                  {
                    put("name", "Lincoln Memorial");
                    put("type", "memorial");
                  }
                }),
        cities
            .document("DC")
            .collection("landmarks")
            .document()
            .set(
                new HashMap<String, String>() {
                  {
                    put("name", "National Air and Space Museum");
                    put("type", "museum");
                  }
                }),
        cities
            .document("TOK")
            .collection("landmarks")
            .document()
            .set(
                new HashMap<String, String>() {
                  {
                    put("name", "Ueno Park");
                    put("type", "park");
                  }
                }),
        cities
            .document("TOK")
            .collection("landmarks")
            .document()
            .set(
                new HashMap<String, String>() {
                  {
                    put("name", "National Museum of Nature and Science");
                    put("type", "museum");
                  }
                }),
        cities
            .document("BJ")
            .collection("landmarks")
            .document()
            .set(
                new HashMap<String, String>() {
                  {
                    put("name", "Jingshan Park");
                    put("type", "park");
                  }
                }),
        cities
            .document("BJ")
            .collection("landmarks")
            .document()
            .set(
                new HashMap<String, String>() {
                  {
                    put("name", "Beijing Ancient Observatory");
                    put("type", "museum");
                  }
                }));
final List<WriteResult> landmarks = ApiFutures.allAsList(futures).get();
QueryDataSnippets.java
Python
cities = db.collection(u'cities')

sf_landmarks = cities.document(u'SF').collection(u'landmarks')
sf_landmarks.document().set({
    u'name': u'Golden Gate Bridge',
    u'type': u'bridge'
})
sf_landmarks.document().set({
    u'name': u'Legion of Honor',
    u'type': u'museum'
})
la_landmarks = cities.document(u'LA').collection(u'landmarks')
la_landmarks.document().set({
    u'name': u'Griffith Park',
    u'type': u'park'
})
la_landmarks.document().set({
    u'name': u'The Getty',
    u'type': u'museum'
})
dc_landmarks = cities.document(u'DC').collection(u'landmarks')
dc_landmarks.document().set({
    u'name': u'Lincoln Memorial',
    u'type': u'memorial'
})
dc_landmarks.document().set({
    u'name': u'National Air and Space Museum',
    u'type': u'museum'
})
tok_landmarks = cities.document(u'TOK').collection(u'landmarks')
tok_landmarks.document().set({
    u'name': u'Ueno Park',
    u'type': u'park'
})
tok_landmarks.document().set({
    u'name': u'National Museum of Nature and Science',
    u'type': u'museum'
})
bj_landmarks = cities.document(u'BJ').collection(u'landmarks')
bj_landmarks.document().set({
    u'name': u'Jingshan Park',
    u'type': u'park'
})
bj_landmarks.document().set({
    u'name': u'Beijing Ancient Observatory',
    u'type': u'museum'
})
snippets.py

Python

cities = db.collection("cities")

sf_landmarks = cities.document("SF").collection("landmarks")
await sf_landmarks.document().set({"name": "Golden Gate Bridge", "type": "bridge"})
await sf_landmarks.document().set({"name": "Legion of Honor", "type": "museum"})
la_landmarks = cities.document("LA").collection("landmarks")
await la_landmarks.document().set({"name": "Griffith Park", "type": "park"})
await la_landmarks.document().set({"name": "The Getty", "type": "museum"})
dc_landmarks = cities.document("DC").collection("landmarks")
await dc_landmarks.document().set({"name": "Lincoln Memorial", "type": "memorial"})
await dc_landmarks.document().set(
    {"name": "National Air and Space Museum", "type": "museum"}
)
tok_landmarks = cities.document("TOK").collection("landmarks")
await tok_landmarks.document().set({"name": "Ueno Park", "type": "park"})
await tok_landmarks.document().set(
    {"name": "National Museum of Nature and Science", "type": "museum"}
)
bj_landmarks = cities.document("BJ").collection("landmarks")
await bj_landmarks.document().set({"name": "Jingshan Park", "type": "park"})
await bj_landmarks.document().set(
    {"name": "Beijing Ancient Observatory", "type": "museum"}
)
snippets.py
C++
// This is not yet supported.
Node.js
const citiesRef = db.collection('cities');

await citiesRef.doc('SF').collection('landmarks').doc().set({
  name: 'Golden Gate Bridge',
  type: 'bridge'
});
await citiesRef.doc('SF').collection('landmarks').doc().set({
  name: 'Legion of Honor',
  type: 'museum'
});
await citiesRef.doc('LA').collection('landmarks').doc().set({
  name: 'Griffith Park',
  type: 'park'
});
await citiesRef.doc('LA').collection('landmarks').doc().set({
  name: 'The Getty',
  type: 'museum'
});
await citiesRef.doc('DC').collection('landmarks').doc().set({
  name: 'Lincoln Memorial',
  type: 'memorial'
});
await citiesRef.doc('DC').collection('landmarks').doc().set({
  name: 'National Air and Space Museum',
  type: 'museum'
});
await citiesRef.doc('TOK').collection('landmarks').doc().set({
  name: 'Ueno Park',
  type: 'park'
});
await citiesRef.doc('TOK').collection('landmarks').doc().set({
  name: 'National Museum of Nature and Science',
  type: 'museum'
});
await citiesRef.doc('BJ').collection('landmarks').doc().set({
  name: 'Jingshan Park',
  type: 'park'
});
await citiesRef.doc('BJ').collection('landmarks').doc().set({
  name: 'Beijing Ancient Observatory',
  type: 'museum'
});
index.js
Go
import (
	"context"
	"fmt"

	"cloud.google.com/go/firestore"
)

// collectionGroupSetup sets up a collection group to query.
func collectionGroupSetup(projectID, cityCollection string) error {
	ctx := context.Background()

	client, err := firestore.NewClient(ctx, projectID)
	if err != nil {
		return fmt.Errorf("firestore.NewClient: %v", err)
	}
	defer client.Close()

	landmarks := []struct {
		city, name, t string
	}{
		{"SF", "Golden Gate Bridge", "bridge"},
		{"SF", "Legion of Honor", "museum"},
		{"LA", "Griffith Park", "park"},
		{"LA", "The Getty", "museum"},
		{"DC", "Lincoln Memorial", "memorial"},
		{"DC", "National Air and Space Museum", "museum"},
		{"TOK", "Ueno Park", "park"},
		{"TOK", "National Museum of Nature and Science", "museum"},
		{"BJ", "Jingshan Park", "park"},
		{"BJ", "Beijing Ancient Observatory", "museum"},
	}

	cities := client.Collection(cityCollection)
	for _, l := range landmarks {
		if _, err := cities.Doc(l.city).Collection("landmarks").NewDoc().Set(ctx, map[string]string{
			"name": l.name,
			"type": l.t,
		}); err != nil {
			return fmt.Errorf("Set: %v", err)
		}
	}

	return nil
}

collection_group_setup.go
PHP
$citiesRef = $db->collection('samples/php/cities');
$citiesRef->document('SF')->collection('landmarks')->newDocument()->set([
    'name' => 'Golden Gate Bridge',
    'type' => 'bridge'
]);
$citiesRef->document('SF')->collection('landmarks')->newDocument()->set([
    'name' => 'Legion of Honor',
    'type' => 'museum'
]);
$citiesRef->document('LA')->collection('landmarks')->newDocument()->set([
    'name' => 'Griffith Park',
    'type' => 'park'
]);
$citiesRef->document('LA')->collection('landmarks')->newDocument()->set([
    'name' => 'The Getty',
    'type' => 'museum'
]);
$citiesRef->document('DC')->collection('landmarks')->newDocument()->set([
    'name' => 'Lincoln Memorial',
    'type' => 'memorial'
]);
$citiesRef->document('DC')->collection('landmarks')->newDocument()->set([
    'name' => 'National Air and Space Museum',
    'type' => 'museum'
]);
$citiesRef->document('TOK')->collection('landmarks')->newDocument()->set([
    'name' => 'Ueno Park',
    'type' => 'park'
]);
$citiesRef->document('TOK')->collection('landmarks')->newDocument()->set([
    'name' => 'National Museum of Nature and Science',
    'type' => 'museum'
]);
$citiesRef->document('BJ')->collection('landmarks')->newDocument()->set([
    'name' => 'Jingshan Park',
    'type' => 'park'
]);
$citiesRef->document('BJ')->collection('landmarks')->newDocument()->set([
    'name' => 'Beijing Ancient Observatory',
    'type' => 'museum'
]);
print('Added example landmarks collections to the cities collection.' . PHP_EOL);
query_collection_group_dataset.php
Unity
List<Task<DocumentReference>> futures =
    new List<Task<DocumentReference>>(){
        citiesRef
            .Document("SF")
            .Collection("landmarks")
            .AddAsync(
                new Dictionary<string, object>()
                {
                    {"name", "Golden Gate Bridge"},
                    {"type", "bridge"},
                }
                ),
        citiesRef
            .Document("SF")
            .Collection("landmarks")
            .AddAsync(
                new Dictionary<string, object>()
                {
                    {"name", "Legion of Honor"},
                    {"type", "museum"},
                }
                ),
        citiesRef
            .Document("LA")
            .Collection("landmarks")
            .AddAsync(
                new Dictionary<string, object>()
                {
                    {"name", "Griffith Park"},
                    {"type", "park"},
                }
                ),
        citiesRef
            .Document("LA")
            .Collection("landmarks")
            .AddAsync(
                new Dictionary<string, object>()
                {
                    {"name", "The Getty"},
                    {"type", "museum"},
                }
                ),
        citiesRef
            .Document("DC")
            .Collection("landmarks")
            .AddAsync(
                new Dictionary<string, object>()
                {
                    {"name", "Lincoln Memorial"},
                    {"type", "memorial"},
                }
                ),
        citiesRef
            .Document("DC")
            .Collection("landmarks")
            .AddAsync(
                new Dictionary<string, object>()
                {
                    {"name", "National Air and Space Museum"},
                    {"type", "museum"},
                }
                ),
        citiesRef
            .Document("TOK")
            .Collection("landmarks")
            .AddAsync(
                new Dictionary<string, object>()
                {
                    {"name", "Ueno Park"},
                    {"type", "park"},
                }
                ),
        citiesRef
            .Document("TOK")
            .Collection("landmarks")
            .AddAsync(
                new Dictionary<string, object>()
                {
                    {"name", "National Museum of Nature and Science"},
                    {"type", "museum"},
                }
                ),
        citiesRef
            .Document("BJ")
            .Collection("landmarks")
            .AddAsync(
                new Dictionary<string, object>()
                {
                    {"name", "Jingshan Park"},
                    {"type", "park"},
                }
                ),
        citiesRef
            .Document("BJ")
            .Collection("landmarks")
            .AddAsync(
                new Dictionary<string, object>()
                {
                    {"name", "Beijing Ancient Observatory"},
                    {"type", "museum"},
                }
                )};
DocumentReference[] landmarks = Task.WhenAll(futures).Result;
C#
// 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 Google.Cloud.Firestore;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Threading.Tasks;

namespace GoogleCloudSamples
{
    public class QueryData
    {
        public static string Usage = @"Usage:
C:\> dotnet run command YOUR_PROJECT_ID

Where command is one of
    query-create-examples
    create-query-state
    create-query-capital
    simple-queries
    array-contains-query
    array-contains-any-query
    in-query
    in-query-array
    collection-group-query
    chained-query
    composite-index-chained-query
    range-query
    invalid-range-query
";
        private static async Task QueryCreateExamples(string project)
        {
            FirestoreDb db = FirestoreDb.Create(project);
            CollectionReference citiesRef = db.Collection("cities");
            await citiesRef.Document("SF").SetAsync(new Dictionary<string, object>(){
                { "Name", "San Francisco" },
                { "State", "CA" },
                { "Country", "USA" },
                { "Capital", false },
                { "Population", 860000 },
                { "Regions", new ArrayList{"west_coast", "norcal"} }
            });
            await citiesRef.Document("LA").SetAsync(new Dictionary<string, object>(){
                { "Name", "Los Angeles" },
                { "State", "CA" },
                { "Country", "USA" },
                { "Capital", false },
                { "Population", 3900000 },
                { "Regions", new ArrayList{"west_coast", "socal"} }
            });
            await citiesRef.Document("DC").SetAsync(new Dictionary<string, object>(){
                { "Name", "Washington D.C." },
                { "State", null },
                { "Country", "USA" },
                { "Capital", true },
                { "Population", 680000 },
                { "Regions", new ArrayList{"east_coast"} }
            });
            await citiesRef.Document("TOK").SetAsync(new Dictionary<string, object>(){
                { "Name", "Tokyo" },
                { "State", null },
                { "Country", "Japan" },
                { "Capital", true },
                { "Population", 9000000 },
                { "Regions", new ArrayList{"kanto", "honshu"} }
            });
            await citiesRef.Document("BJ").SetAsync(new Dictionary<string, object>(){
                { "Name", "Beijing" },
                { "State", null },
                { "Country", "China" },
                { "Capital", true },
                { "Population", 21500000 },
                { "Regions", new ArrayList{"jingjinji", "hebei"} }
            });
            Console.WriteLine("Added example cities data to the cities collection.");
        }

        private static async Task CreateQueryState(string project)
        {
            FirestoreDb db = FirestoreDb.Create(project);
            CollectionReference citiesRef = db.Collection("cities");
            Query query = citiesRef.WhereEqualTo("State", "CA");
            QuerySnapshot querySnapshot = await query.GetSnapshotAsync();
            foreach (DocumentSnapshot documentSnapshot in querySnapshot.Documents)
            {
                Console.WriteLine("Document {0} returned by query State=CA", documentSnapshot.Id);
            }
        }

        private static async Task CreateQueryCapital(string project)
        {
            FirestoreDb db = FirestoreDb.Create(project);
            CollectionReference citiesRef = db.Collection("cities");
            Query query = citiesRef.WhereEqualTo("Capital", true);
            QuerySnapshot querySnapshot = await query.GetSnapshotAsync();
            foreach (DocumentSnapshot documentSnapshot in querySnapshot.Documents)
            {
                Console.WriteLine("Document {0} returned by query Capital=true", documentSnapshot.Id);
            }
        }

        private static async Task SimpleQueries(string project)
        {
            FirestoreDb db = FirestoreDb.Create(project);
            CollectionReference citiesRef = db.Collection("cities");
            Query stateQuery = citiesRef.WhereEqualTo("State", "CA");
            Query populationQuery = citiesRef.WhereGreaterThan("Population", 1000000);
            Query nameQuery = citiesRef.WhereGreaterThanOrEqualTo("Name", "San Francisco");
            QuerySnapshot stateQuerySnapshot = await stateQuery.GetSnapshotAsync();
            foreach (DocumentSnapshot documentSnapshot in stateQuerySnapshot.Documents)
            {
                Console.WriteLine("Document {0} returned by query State=CA", documentSnapshot.Id);
            }
            QuerySnapshot populationQuerySnapshot = await populationQuery.GetSnapshotAsync();
            foreach (DocumentSnapshot documentSnapshot in populationQuerySnapshot.Documents)
            {
                Console.WriteLine("Document {0} returned by query Population>1000000", documentSnapshot.Id);
            }
            QuerySnapshot nameQuerySnapshot = await nameQuery.GetSnapshotAsync();
            foreach (DocumentSnapshot documentSnapshot in nameQuerySnapshot.Documents)
            {
                Console.WriteLine("Document {0} returned by query Name>=San Francisco", documentSnapshot.Id);
            }
        }

        private static async Task ArrayContainsQuery(string project)
        {
            FirestoreDb db = FirestoreDb.Create(project);
            CollectionReference citiesRef = db.Collection("cities");
            Query query = citiesRef.WhereArrayContains("Regions", "west_coast");
            QuerySnapshot querySnapshot = await query.GetSnapshotAsync();
            foreach (DocumentSnapshot documentSnapshot in querySnapshot.Documents)
            {
                Console.WriteLine("Document {0} returned by query 'Regions array_contains west_coast'", documentSnapshot.Id);
            }
        }

        private static async Task ArrayContainsAnyQuery(string project)
        {
            FirestoreDb db = FirestoreDb.Create(project);
            CollectionReference citiesRef = db.Collection("cities");
            Query query = citiesRef.WhereArrayContainsAny("Regions", new[] { "west_coast", "east_coast" });
            QuerySnapshot querySnapshot = await query.GetSnapshotAsync();
            foreach (DocumentSnapshot documentSnapshot in querySnapshot.Documents)
            {
                Console.WriteLine("Document {0} returned by query 'Regions array_contains_any {{west_coast, east_coast}}'", documentSnapshot.Id);
            }
        }

        private static async Task InQueryWithoutArray(string project)
        {
            FirestoreDb db = FirestoreDb.Create(project);
            CollectionReference citiesRef = db.Collection("cities");
            Query query = citiesRef.WhereIn("Country", new[] { "USA", "Japan" });
            QuerySnapshot querySnapshot = await query.GetSnapshotAsync();
            foreach (DocumentSnapshot documentSnapshot in querySnapshot.Documents)
            {
                Console.WriteLine("Document {0} returned by query 'Country in {{USA, Japan}}'", documentSnapshot.Id);
            }
        }

        private static async Task InQueryWithArray(string project)
        {
            FirestoreDb db = FirestoreDb.Create(project);
            CollectionReference citiesRef = db.Collection("cities");
            Query query = citiesRef.WhereIn("Regions",
                new[] { new[] { "west_coast" }, new[] { "east_coast" } });
            QuerySnapshot querySnapshot = await query.GetSnapshotAsync();
            foreach (DocumentSnapshot documentSnapshot in querySnapshot.Documents)
            {
                Console.WriteLine("Document {0} returned by query 'Regions in {{west_coast}}, {{east_coast}}'", documentSnapshot.Id);
            }
        }

        private static async Task CollectionGroupQuery(string project)
        {
            FirestoreDb db = FirestoreDb.Create(project);
            CollectionReference citiesRef = db.Collection("cities");
            await citiesRef.Document("SF").Collection("landmarks").Document()
                .CreateAsync(new { Name = "Golden Gate Bridge", Type = "bridge" });
            await citiesRef.Document("SF").Collection("landmarks").Document()
                .CreateAsync(new { Name = "Legion of Honor", Type = "museum" });
            await citiesRef.Document("LA").Collection("landmarks").Document()
                .CreateAsync(new { Name = "Griffith Park", Type = "park" });
            await citiesRef.Document("DC").Collection("landmarks").Document()
                .CreateAsync(new { Name = "Lincoln Memorial", Type = "memorial" });
            await citiesRef.Document("DC").Collection("landmarks").Document()
                .CreateAsync(new { Name = "National Air And Space Museum", Type = "museum" });
            await citiesRef.Document("TOK").Collection("landmarks").Document()
                .CreateAsync(new { Name = "Ueno Park", Type = "park" });
            await citiesRef.Document("TOK").Collection("landmarks").Document()
                .CreateAsync(new { Name = "National Museum of Nature and Science", Type = "museum" });
            await citiesRef.Document("BJ").Collection("landmarks").Document()
                .CreateAsync(new { Name = "Jingshan Park", Type = "park" });
            await citiesRef.Document("BJ").Collection("landmarks").Document()
                .CreateAsync(new { Name = "Beijing Ancient Observatory", Type = "museum" });

            Query museums = db.CollectionGroup("landmarks").WhereEqualTo("Type", "museum");
            QuerySnapshot querySnapshot = await museums.GetSnapshotAsync();
            foreach (DocumentSnapshot document in querySnapshot.Documents)
            {
                Console.WriteLine($"{document.Reference.Path}: {document.GetValue<string>("Name")}");
            }
        }

        private static async Task ChainedQuery(string project)
        {
            FirestoreDb db = FirestoreDb.Create(project);
            CollectionReference citiesRef = db.Collection("cities");
            Query chainedQuery = citiesRef
                .WhereEqualTo("State", "CA")
                .WhereEqualTo("Name", "San Francisco");
            QuerySnapshot querySnapshot = await chainedQuery.GetSnapshotAsync();
            foreach (DocumentSnapshot documentSnapshot in querySnapshot.Documents)
            {
                Console.WriteLine("Document {0} returned by query State=CA and Name=San Francisco", documentSnapshot.Id);
            }
        }

        private static async Task CompositeIndexChainedQuery(string project)
        {
            FirestoreDb db = FirestoreDb.Create(project);
            CollectionReference citiesRef = db.Collection("cities");
            Query chainedQuery = citiesRef
                .WhereEqualTo("State", "CA")
                .WhereLessThan("Population", 1000000);
            QuerySnapshot querySnapshot = await chainedQuery.GetSnapshotAsync();
            foreach (DocumentSnapshot documentSnapshot in querySnapshot.Documents)
            {
                Console.WriteLine("Document {0} returned by query State=CA and Population<1000000", documentSnapshot.Id);
            }
        }

        private static async Task RangeQuery(string project)
        {
            FirestoreDb db = FirestoreDb.Create(project);
            CollectionReference citiesRef = db.Collection("cities");
            Query rangeQuery = citiesRef
                .WhereGreaterThanOrEqualTo("State", "CA")
                .WhereLessThanOrEqualTo("State", "IN");
            QuerySnapshot querySnapshot = await rangeQuery.GetSnapshotAsync();
            foreach (DocumentSnapshot documentSnapshot in querySnapshot.Documents)
            {
                Console.WriteLine("Document {0} returned by query CA<=State<=IN", documentSnapshot.Id);
            }
        }

        private static void InvalidRangeQuery(string project)
        {
            FirestoreDb db = FirestoreDb.Create(project);
            CollectionReference citiesRef = db.Collection("cities");
            Query invalidRangeQuery = citiesRef
                .WhereGreaterThanOrEqualTo("State", "CA")
                .WhereGreaterThan("Population", 1000000);
        }

        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 "query-create-examples":
                    QueryCreateExamples(project).Wait();
                    break;

                case "create-query-state":
                    CreateQueryState(project).Wait();
                    break;

                case "create-query-capital":
                    CreateQueryCapital(project).Wait();
                    break;

                case "simple-queries":
                    SimpleQueries(project).Wait();
                    break;

                case "array-contains-query":
                    ArrayContainsQuery(project).Wait();
                    break;

                case "array-contains-any-query":
                    ArrayContainsAnyQuery(project).Wait();
                    break;

                case "in-query":
                    InQueryWithoutArray(project).Wait();
                    break;

                case "in-query-array":
                    InQueryWithArray(project).Wait();
                    break;

                case "collection-group-query":
                    CollectionGroupQuery(project).Wait();
                    break;

                case "chained-query":
                    ChainedQuery(project).Wait();
                    break;

                case "composite-index-chained-query":
                    CompositeIndexChainedQuery(project).Wait();
                    break;

                case "range-query":
                    RangeQuery(project).Wait();
                    break;

                case "invalid-range-query":
                    InvalidRangeQuery(project);
                    break;

                default:
                    Console.Write(Usage);
                    return;
            }
        }
    }
}

Program.cs
Ruby
cities_ref = firestore.col collection_path

sf_landmarks = cities_ref.document("SF").collection("landmarks")
sf_landmarks.document.set(
  {
    name: "Golden Gate Bridge",
    type: "bridge"
  }
)
sf_landmarks.document.set(
  {
    name: "Legion of Honor",
    type: "museum"
  }
)

la_landmarks = cities_ref.document("LA").collection("landmarks")
la_landmarks.document.set(
  {
    name: "Griffith Park",
    type: "park"
  }
)
la_landmarks.document.set(
  {
    name: "The Getty",
    type: "museum"
  }
)

dc_landmarks = cities_ref.document("DC").collection("landmarks")
dc_landmarks.document.set(
  {
    name: "Lincoln Memorial",
    type: "memorial"
  }
)
dc_landmarks.document.set(
  {
    name: "National Air and Space Museum",
    type: "museum"
  }
)

tok_landmarks = cities_ref.document("TOK").collection("landmarks")
tok_landmarks.document.set(
  {
    name: "Ueno Park",
    type: "park"
  }
)
tok_landmarks.document.set(
  {
    name: "National Museum of Nature and Science",
    type: "museum"
  }
)

bj_landmarks = cities_ref.document("BJ").collection("landmarks")
bj_landmarks.document.set(
  {
    name: "Jingshan Park",
    type: "park"
  }
)
bj_landmarks.document.set(
  {
    name: "Beijing Ancient Observatory",
    type: "museum"
  }
)
query_data.rb

Kita dapat menggunakan kueri sederhana dan gabungan yang dijelaskan sebelumnya untuk membuat kueri subkoleksi landmarks satu kota, tetapi Anda juga dapat mengambil hasil dari subkoleksi landmarks setiap kota sekaligus.

Grup koleksi landmarks terdiri dari semua koleksi dengan ID landmarks, dan Anda dapat membuat kuerinya menggunakan kueri grup koleksi. Misalnya, kueri grup koleksi ini mengambil semua tempat terkenal museum di semua kota:

Web version 9

import { collectionGroup, query, where, getDocs } from "firebase/firestore";

const museums = query(collectionGroup(db, 'landmarks'), where('type', '==', 'museum'));
const querySnapshot = await getDocs(museums);
querySnapshot.forEach((doc) => {
    console.log(doc.id, ' => ', doc.data());
});
fs_collection_group_query.js

Web version 8

var museums = db.collectionGroup('landmarks').where('type', '==', 'museum');
museums.get().then((querySnapshot) => {
    querySnapshot.forEach((doc) => {
        console.log(doc.id, ' => ', doc.data());
    });
});
test.firestore.js
Swift
Catatan: Produk ini tidak tersedia di target watchOS dan App Clip. 
db.collectionGroup("landmarks").whereField("type", isEqualTo: "museum").getDocuments { (snapshot, error) in
    // ...
}
ViewController.swift
Objective-C
Catatan: Produk ini tidak tersedia di target watchOS dan App Clip. 
[[[self.db collectionGroupWithID:@"landmarks"] queryWhereField:@"type" isEqualTo:@"museum"]
    getDocumentsWithCompletion:^(FIRQuerySnapshot *snapshot, NSError *error) {
    // ...
}];
ViewController.m

Kotlin+KTX

db.collectionGroup("landmarks").whereEqualTo("type", "museum").get()
    .addOnSuccessListener { queryDocumentSnapshots ->
        // ...
    }
DocSnippets.kt

Java

db.collectionGroup("landmarks").whereEqualTo("type", "museum").get()
        .addOnSuccessListener(new OnSuccessListener<QuerySnapshot>() {
            @Override
            public void onSuccess(QuerySnapshot queryDocumentSnapshots) {
                // ...
            }
        });
DocSnippets.java

Dart

db
    .collectionGroup("landmarks")
    .where("type", isEqualTo: "museum")
    .get()
    .then(
      (res) => print("Successfully completed"),
      onError: (e) => print("Error completing: $e"),
    );
firestore.dart
Java
final Query museums = db.collectionGroup("landmarks").whereEqualTo("type", "museum");
final ApiFuture<QuerySnapshot> querySnapshot = museums.get();
for (DocumentSnapshot document : querySnapshot.get().getDocuments()) {
  System.out.println(document.getId());
}
QueryDataSnippets.java
Python
museums = db.collection_group(u'landmarks')\
    .where(u'type', u'==', u'museum')
docs = museums.stream()
for doc in docs:
    print(f'{doc.id} => {doc.to_dict()}')
snippets.py

Python

museums = db.collection_group("landmarks").where("type", "==", "museum")
docs = museums.stream()
async for doc in docs:
    print(f"{doc.id} => {doc.to_dict()}")
snippets.py
C++
// This is not yet supported.
Node.js
const querySnapshot = await db.collectionGroup('landmarks').where('type', '==', 'museum').get();
querySnapshot.forEach((doc) => {
  console.log(doc.id, ' => ', doc.data());
});
index.js
Go
import (
	"context"
	"fmt"
	"io"

	"cloud.google.com/go/firestore"
	"google.golang.org/api/iterator"
)

// collectionGroupQuery runs a collection group query over the data created by
// collectionGroupSetup.
func collectionGroupQuery(w io.Writer, projectID string) error {
	ctx := context.Background()

	client, err := firestore.NewClient(ctx, projectID)
	if err != nil {
		return fmt.Errorf("firestore.NewClient: %v", err)
	}
	defer client.Close()

	it := client.CollectionGroup("landmarks").Where("type", "==", "museum").Documents(ctx)
	for {
		doc, err := it.Next()
		if err == iterator.Done {
			break
		}
		if err != nil {
			return fmt.Errorf("documents iterator: %v", err)
		}
		fmt.Fprintf(w, "%s: %s", doc.Ref.ID, doc.Data()["name"])
	}

	return nil
}

collection_group_query.go
PHP
$museums = $db->collectionGroup('landmarks')->where('type', '==', 'museum');
foreach ($museums->documents() as $document) {
    printf('%s => %s' . PHP_EOL, $document->id(), $document->data()['name']);
}
query_collection_group_filter_eq.php
Unity
Query museums = db.CollectionGroup("landmarks").WhereEqualTo("type", "museum");
museums.GetSnapshotAsync().ContinueWithOnMainThread((querySnapshotTask) =>
{
    foreach (DocumentSnapshot documentSnapshot in querySnapshotTask.Result.Documents)
    {
        Debug.Log(String.Format("Document {0} returned by query State=CA", documentSnapshot.Id));
    }
});
C#
Query museums = db.CollectionGroup("landmarks").WhereEqualTo("Type", "museum");
QuerySnapshot querySnapshot = await museums.GetSnapshotAsync();
foreach (DocumentSnapshot document in querySnapshot.Documents)
{
    Console.WriteLine($"{document.Reference.Path}: {document.GetValue<string>("Name")}");
}
Program.cs
Ruby
museums = firestore.collection_group("landmarks").where("type", "==", "museum")
museums.get do |museum|
  puts "#{museum[:type]} name is #{museum[:name]}."
end
query_data.rb

Sebelum menggunakan kueri grup koleksi, Anda harus membuat indeks yang mendukung kueri grup koleksi Anda. Anda dapat membuat indeks melalui pesan error, konsol, atau Firebase CLI.

Untuk SDK web dan seluler, Anda juga harus membuat aturan yang mengizinkan kueri grup koleksi Anda.

Batasan kueri

Berikut rangkuman batasan kueri Cloud Firestore:

  • Cloud Firestore menyediakan dukungan untuk kueri OR yang logis melalui operator or, in, dan array-contains-any. Kueri ini terbatas pada 30 disjungsi berdasarkan bentuk normal disjungtif kueri.
  • Pada kueri gabungan, perbandingan rentang (<, <=, >, >=) dan tidak sama dengan (!=, not-in) harus memfilter kolom yang sama.
  • Anda dapat menggunakan maksimum satu klausa array-contains per disjungsi (grup or). Anda tidak dapat menggabungkan array-contains dengan array-contains-any dalam disjungsi yang sama.
  • Anda tidak dapat menggabungkan not-in dengan in, array-contains-any, atau or dalam kueri yang sama.
  • Hanya satu not-in atau !=` yang diizinkan per kueri.
  • not-in mendukung hingga 10 nilai perbandingan.
  • Anda tidak dapat mengurutkan kueri berdasarkan kolom yang disertakan dalam klausa kesetaraan (==) atau in.
  • Anda tidak boleh memiliki kesetaraan (==) dan ketidaksetaraan (<, <=, >, dan !=) di kolom yang sama di seluruh disjungsi (or, in, array-contains-any).
  • Jumlah filter, tata urutan, dan jalur dokumen induk (1 untuk subkoleksi, 0 untuk koleksi root) dalam kueri tidak boleh melebihi 100. Ini dihitung berdasarkan bentuk normal disjungtif kueri.
  • Kueri dengan filter ketidaksetaraan di suatu kolom berarti mengurutkan berdasarkan kolom tersebut dan filter untuk adanya kolom tersebut.

Batasan pada OR kueri

Agar kueri tidak menjadi terlalu mahal secara komputasi, Cloud Firestore membatasi jumlah klausa AND dan OR yang dapat Anda gabungkan. Untuk menerapkan batas ini, Cloud Firestore mengonversi kueri yang menjalankan operasi OR logis (or, in, dan array-contains-any) ke bentuk normal disjungtif (juga dikenal sebagai OR dari AND). Cloud Firestore membatasi kueri hingga maksimum 30 disjungsi dalam bentuk normal disjungtif.

Bentuk normal disjungtif

Cloud Firestore mengonversi kueri ke bentuk normal disjungtif dengan menerapkan dua aturan:

  • Ratakan

    Kondisi tertentu A, B, dan C:

    A and (B and C) => A and B and C

  • Hukum Mendistribusikan

    Kondisi yang diberikan A, B, C, dan D:

    • A and (B or C) => (A and B) or (A and C)
    • (A or B) and (C or D) => (A and C) or (A and D) or (B and C) or (B and D)

Saat menerapkan aturan ini ke kueri in dan array-contains-any, perlu diingat bahwa operator ini adalah singkatan untuk OR. Misalnya, a in [1,2] adalah singkatan untuk a = 1 OR a = 2.

Contoh berikut menunjukkan jumlah disjungsi untuk berbagai kueri:

KueriJumlah disjunksi

query(collectionRef, where("a", "==", 1))
1 

query(collectionRef, or( where("a", "==", 1), where("b", "==", 2) ))
2 

query(collectionRef,
        or( and( where("a", "==", 1), where("c", "==", 3) ),
            and( where("a", "==", 1), where("d", "==", 4) ),
            and( where("b", "==", 2), where("c", "==", 3) ),
            and( where("b", "==", 2), where("d", "==", 4) )
        )
      )
4 

query(collectionRef,
        and( or( where("a", "==", 1), where("b", "==", 2) ),
             or( where("c", "==", 3), where("d", "==", 4) )
        )
      )

4

Bentuk normal disjungtif kueri ini sama dengan kueri di atas.

 

query(collectionRef, where("a", "in", [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]) )
10 

query(collectionRef,
        and( where("a", "in", [1, 2, 3, 4, 5]),
             where("b", "in", [1, 2, 3, 4, 5, 6, 7, 8, 9, 10])
        )
      )

50

Kueri ini menampilkan error, karena melampaui batas 30 disjungsi.

 

query(collectionRef,
        or( where("a", "in", [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]),
            where("b", "in", [1, 2, 3, 4, 5, 6, 7, 8, 9, 10])
        )
      )
20 

query(collectionRef,
        and( where("a", "in", [1, 2, 3, 4, 5]),
             or( where("b", "==", 2),
                 where("c", "==", 3)
             )
        )
      )
10

orderBy dan keberadaannya

Saat Anda mengurutkan kueri berdasarkan kolom tertentu, kueri tersebut hanya dapat menampilkan dokumen yang memiliki urutan berdasarkan kolom.

Misalnya, kueri berikut tidak akan menampilkan dokumen apa pun yang tidak memiliki kolom population, meskipun kolom tersebut memenuhi filter kueri.

Java
db.collection("cities").whereEqualTo("country", “USA”).orderBy(“population”);

Efek terkait berlaku pada ketidaksetaraan. Kueri dengan filter ketidaksetaraan pada satu kolom juga menyiratkan pengurutan berdasarkan kolom tersebut. Kueri berikut tidak menampilkan dokumen tanpa kolom population sekalipun country = USA dalam dokumen tersebut . Sebagai solusinya, Anda dapat menjalankan kueri terpisah untuk setiap pengurutan atau menetapkan nilai untuk semua kolom yang Anda urutkan.

Java
db.collection(“cities”).where(or(“country”, USA”), greaterThan(“population”, 250000));

Kueri di atas mencakup urutan tersirat berdasarkan ketidaksetaraan dan setara dengan hal berikut:

Java
db.collection(“cities”).where(or(“country”, USA”), greaterThan(“population”, 250000)).orderBy(“population”);

Apa selanjutnya?