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نفذ استعلامات بسيطة ومركبة في Cloud Firestore

يوفر Cloud Firestore وظائف استعلام قوية لتحديد المستندات التي تريد استردادها من مجموعة أو مجموعة مجموعة. يمكن أيضًا استخدام هذه الاستعلامات مع get() أو addSnapshotListener() ، كما هو موضح في Get Data and Get Realtime Updates .

مثال على البيانات

للبدء ، اكتب بعض البيانات عن المدن حتى نتمكن من البحث عن طرق مختلفة لقراءتها مرة أخرى:

Web modular API

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"] });

Web namespaced API

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"] });
سويفت
ملاحظة: هذا المنتج غير متوفر في أهداف watchOS و 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"]
    ])
ج موضوعية
ملاحظة: هذا المنتج غير متوفر في أهداف watchOS و 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"]
}];

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)

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);

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);
جافا
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();
بايثون
class City:
    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')
cities_ref.document('BJ').set(
    City('Beijing', None, 'China', True, 21500000, ['hebei']).to_dict())
cities_ref.document('SF').set(
    City('San Francisco', 'CA', 'USA', False, 860000,
         ['west_coast', 'norcal']).to_dict())
cities_ref.document('LA').set(
    City('Los Angeles', 'CA', 'USA', False, 3900000,
         ['west_coast', 'socal']).to_dict())
cities_ref.document('DC').set(
    City('Washington D.C.', None, 'USA', True, 680000,
         ['east_coast']).to_dict())
cities_ref.document('TOK').set(
    City('Tokyo', None, 'Japan', True, 9000000,
         ['kanto', 'honshu']).to_dict())

Python

class City:
    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()
)
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")})},
});
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']
});
يذهب
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
	}
}
بي أتش بي
$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);
وحدة
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"} }
});
سي #
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.");
روبي
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"]
  }
)

استفسارات بسيطة

يقوم الاستعلام التالي بإرجاع جميع المدن ذات الولاية CA :

Web modular API

// 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"));

Web namespaced API

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

// Create a query against the collection.
var query = citiesRef.where("state", "==", "CA");
سويفت
ملاحظة: هذا المنتج غير متوفر في أهداف watchOS و 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")
ج موضوعية
ملاحظة: هذا المنتج غير متوفر في أهداف watchOS و 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"];

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")

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");

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");
جافا
// 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());
}
بايثون
# 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')

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")
C ++
CollectionReference cities_ref = db->Collection("cities");
// Create a query against the collection.
Query query_ca =
    cities_ref.WhereEqualTo("state", FieldValue::String("CA"));
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');
يذهب
query := client.Collection("cities").Where("state", "==", "CA")
بي أتش بي
$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());
}
وحدة
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));
    } 
});
سي #
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);
}
روبي
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

يقوم الاستعلام التالي بإرجاع جميع العواصم:

Web modular API

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

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

Web namespaced API

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

var query = citiesRef.where("capital", "==", true);
سويفت
ملاحظة: هذا المنتج غير متوفر في أهداف watchOS و App Clip.
let capitalCities = db.collection("cities").whereField("capital", isEqualTo: true)
ج موضوعية
ملاحظة: هذا المنتج غير متوفر في أهداف watchOS و App Clip.
FIRQuery *capitalCities =
    [[self.db collectionWithPath:@"cities"] queryWhereField:@"capital" isEqualTo:@YES];

Kotlin+KTX

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

Java

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

Dart

final capitalcities =
    db.collection("cities").where("capital", isEqualTo: true);
جافا
// 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());
}
بايثون
cities_ref = db.collection('cities')

query = cities_ref.where('capital', '==', True)

Python

cities_ref = db.collection("cities")

query = cities_ref.where("capital", "==", True)
C ++
Query capital_cities = db->Collection("cities").WhereEqualTo(
    "capital", FieldValue::Boolean(true));
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();
يذهب
query := client.Collection("cities").Where("capital", "==", true)
بي أتش بي
$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());
}
وحدة
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));
    } 
});
سي #
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);
}
روبي
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

تنفيذ استعلام

بعد إنشاء كائن استعلام ، استخدم الدالة get() لاسترداد النتائج:

Web modular API

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());
});

Web namespaced API

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);
    });
سويفت
ملاحظة: هذا المنتج غير متوفر في أهداف watchOS و 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())")
            }
        }
}
ج موضوعية
ملاحظة: هذا المنتج غير متوفر في أهداف watchOS و 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);
        }
      }
    }];

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)
    }

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());
                }
            }
        });

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

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

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()}")
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;
      }
    });
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());
});
يذهب

import (
	"context"
	"fmt"

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

func multipleDocs(ctx context.Context, client *firestore.Client) error {
	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())
	}
	return nil
}
بي أتش بي

بي أتش بي

لمزيد من المعلومات حول تثبيت عميل Cloud Firestore وإنشائه ، راجع مكتبات Cloud Firestore Client Libraries .

$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());
    }
}
وحدة
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("");
  };
});
سي #
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("");
}
روبي
cities_ref = firestore.col collection_path

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

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

راجع الحصول على البيانات لمزيد من المعلومات حول استرداد نتائج الاستعلام. يمكنك أيضًا إضافة مستمع إلى استعلام للحصول على النتائج الحالية والاستماع إلى التحديثات المستقبلية.

عوامل تشغيل الاستعلام

تأخذ طريقة where() ثلاثة معلمات: حقل للتصفية وعامل مقارنة وقيمة. يدعم Cloud Firestore عوامل المقارنة التالية:

على سبيل المثال:

Web modular API

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

Web namespaced API

const stateQuery = citiesRef.where("state", "==", "CA");
const populationQuery = citiesRef.where("population", "<", 100000);
const nameQuery = citiesRef.where("name", ">=", "San Francisco");
سويفت
ملاحظة: هذا المنتج غير متوفر في أهداف watchOS و App Clip.
let stateQuery = citiesRef.whereField("state", isEqualTo: "CA")
let populationQuery = citiesRef.whereField("population", isLessThan: 100000)
let nameQuery = citiesRef.whereField("name", isGreaterThanOrEqualTo: "San Francisco")
ج موضوعية
ملاحظة: هذا المنتج غير متوفر في أهداف watchOS و App Clip.
FIRQuery *stateQuery = [citiesRef queryWhereField:@"state" isEqualTo:@"CA"];
FIRQuery *populationQuery = [citiesRef queryWhereField:@"population" isLessThan:@100000];
FIRQuery *nameQuery = [citiesRef queryWhereField:@"name" isGreaterThanOrEqualTo:@"San Francisco"];

Kotlin+KTX

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

Java

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

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");
جافا
Query stateQuery = cities.whereEqualTo("state", "CA");
Query populationQuery = cities.whereLessThan("population", 1000000L);
Query nameQuery = cities.whereGreaterThanOrEqualTo("name", "San Francisco");
بايثون
cities_ref = db.collection('cities')

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

Python

cities_ref = db.collection("cities")

cities_ref.where("state", "==", "CA")
cities_ref.where("population", "<", 1000000)
cities_ref.where("name", ">=", "San Francisco")
C ++
cities_ref.WhereEqualTo("state", FieldValue::String("CA"));
cities_ref.WhereLessThan("population", FieldValue::Integer(100000));
cities_ref.WhereGreaterThanOrEqualTo("name",
                                     FieldValue::String("San Francisco"));
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();
يذهب
countryQuery := cities.Where("state", "==", "CA")
popQuery := cities.Where("population", "<", 1000000)
cityQuery := cities.Where("name", ">=", "San Francisco")
بي أتش بي
$stateQuery = $citiesRef->where('state', '=', 'CA');
$populationQuery = $citiesRef->where('population', '>', 1000000);
$nameQuery = $citiesRef->where('name', '>=', 'San Francisco');
وحدة
Query stateQuery = citiesRef.WhereEqualTo("State", "CA");
Query populationQuery = citiesRef.WhereGreaterThan("Population", 1000000);
Query nameQuery = citiesRef.WhereGreaterThanOrEqualTo("Name", "San Francisco");
سي #
Query stateQuery = citiesRef.WhereEqualTo("State", "CA");
Query populationQuery = citiesRef.WhereGreaterThan("Population", 1000000);
Query nameQuery = citiesRef.WhereGreaterThanOrEqualTo("Name", "San Francisco");
روبي
state_query      = cities_ref.where "state", "=", "CA"
population_query = cities_ref.where "population", ">", 1_000_000
name_query       = cities_ref.where "name", ">=", "San Francisco"

لا يساوي ( != )

استخدم عامل التشغيل لا يساوي ( != ) لإرجاع المستندات حيث يوجد الحقل المحدد ولا يتطابق مع قيمة المقارنة. على سبيل المثال:

Web modular API

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

Web namespaced API

citiesRef.where("capital", "!=", false);
سويفت
ملاحظة: هذا المنتج غير متوفر في أهداف watchOS و App Clip.
let notEqualQuery = citiesRef.whereField("capital", isNotEqualTo: false)
ج موضوعية
ملاحظة: هذا المنتج غير متوفر في أهداف watchOS و App Clip.
query = [citiesRef queryWhereField:@"capital" isNotEqualTo:@NO];

Kotlin+KTX

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

Java

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

Dart

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

Query query = citiesRef.whereNotEqualTo("capital", false);
بايثون
// Snippet not yet available
C ++
cities_ref.WhereNotEqualTo("capital", FieldValue::Boolean(false));
Node.js
const capitalNotFalseRes = await citiesRef.where('capital', '!=', false).get();
يذهب
// Snippet not yet available
بي أتش بي
$stateQuery = $citiesRef->where('capital', '!=', false);
وحدة
Query query = citiesRef.WhereNotEqualTo("capital", false);
Query query = citiesRef.WhereNotEqualTo("capital", false);
سي #
// Snippet not yet available
روبي
cities_ref = firestore.col collection_path
query = cities_ref.where "capital", "!=", false

يقوم هذا الاستعلام بإرجاع كل مستند city حيث يوجد حقل capital بقيمة أخرى غير false أو null . يتضمن ذلك مستندات city حيث تساوي قيمة حقل capital true أو أي قيمة غير منطقية إلى جانب null .

لا يعرض هذا الاستعلام مستندات city حيث لا يوجد حقل capital . لا تساوي ( != ) والاستعلامات not-in تستبعد المستندات التي لا يوجد بها الحقل المحدد .

يوجد الحقل عند تعيينه على أي قيمة ، بما في ذلك سلسلة فارغة ( "" ) وقيمة null و NaN (وليس رقمًا). x != null أن قيم الحقول null لا undefined !=

محددات

لاحظ القيود التالية لـ != استعلامات:

  • يمكن فقط للمستندات التي يوجد بها الحقل المحدد مطابقة الاستعلام.
  • لا يمكنك الجمع بين not-in و != في استعلام مركب.
  • في الاستعلام المركب ، يجب أن تتم تصفية كل مقارنات النطاق ( < ، <= ، > ، >= ) وليس يساوي ( != ، not-in ) في نفس الحقل.

عضوية صفيف

يمكنك استخدام عامل array-contains عامل التصفية استنادًا إلى قيم الصفيف. على سبيل المثال:

Web modular API

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

Web namespaced API

citiesRef.where("regions", "array-contains", "west_coast");
سويفت
ملاحظة: هذا المنتج غير متوفر في أهداف watchOS و App Clip.
citiesRef
  .whereField("regions", arrayContains: "west_coast")
ج موضوعية
ملاحظة: هذا المنتج غير متوفر في أهداف watchOS و App Clip.
[citiesRef queryWhereField:@"state" arrayContains:@"west_coast"];

Kotlin+KTX

val citiesRef = db.collection("cities")

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

Java

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

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

Dart

final citiesRef = db.collection("cities");
final westCoastcities =
    citiesRef.where("regions", arrayContains: "west_coast");
جافا
CollectionReference citiesRef = db.collection("cities");
Query westCoastQuery = citiesRef.whereArrayContains("regions", "west_coast");
بايثون
cities_ref = db.collection('cities')

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

Python

cities_ref = db.collection("cities")

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

cities_ref.WhereArrayContains("region", FieldValue::String("west_coast"));
Node.js
const westCoastCities = citiesRef.where('regions', 'array-contains',
  'west_coast').get();
يذهب
query := cities.Where("regions", "array-contains", "west_coast").Documents(ctx)
بي أتش بي
$containsQuery = $citiesRef->where('regions', 'array-contains', 'west_coast');
وحدة
CollectionReference citiesRef = db.Collection("cities");
Query arrayContainsQuery = citiesRef.WhereArrayContains("region", "west_coast");
سي #
Query query = citiesRef.WhereArrayContains("Regions", "west_coast");
روبي
cities_ref = firestore.col collection_path
cities = cities_ref.where "regions", "array-contains", "west_coast"

يقوم هذا الاستعلام بإرجاع كل وثيقة city يكون فيها مجال regions عبارة عن مصفوفة تحتوي على west_coast . إذا كان للمصفوفة مثيلات متعددة للقيمة التي تستعلم عنها ، فسيتم تضمين المستند في النتائج مرة واحدة فقط.

يمكنك استخدام array-contains واحدة على الأكثر لكل استعلام. لا يمكنك دمج array-contains على array-contains-any .

in ، not-in ، array-contains-any

استخدم عامل التشغيل in لدمج عبارات المساواة المتعددة ( == ) في نفس الحقل باستخدام OR المنطقي. يعرض الاستعلام in مستندات حيث يتطابق الحقل المحدد مع أي من قيم المقارنة. على سبيل المثال:

Web modular API

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

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

Web namespaced API

citiesRef.where('country', 'in', ['USA', 'Japan']);
سويفت
ملاحظة: هذا المنتج غير متوفر في أهداف watchOS و App Clip.
let citiesRef = db.collection("cities")

citiesRef.whereField("country", in: ["USA", "Japan"])
ج موضوعية
ملاحظة: هذا المنتج غير متوفر في أهداف watchOS و App Clip.
FIRCollectionReference *citiesRef = [self.db collectionWithPath:@"cities"];

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

Kotlin+KTX

val citiesRef = db.collection("cities")

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

Java

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

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

Dart

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

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

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

Python

cities_ref = db.collection("cities")

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

cities_ref.WhereIn("country", std::vector<FieldValue> {
  FieldValue::String("USA"),
  FieldValue::String("Japan")
});
Node.js
const usaOrJapan = await citiesRef.where('country', 'in', ['USA', 'Japan']).get();
يذهب
cities := client.Collection("cities")
query := cities.Where("country", "in", []string{"USA", "Japan"}).Documents(ctx)
بي أتش بي
$rangeQuery = $citiesRef->where('country', 'in', ['USA', 'Japan']);
وحدة
CollectionReference citiesRef = db.Collection("cities");
List countriesList = new List<object>() {"USA", "Japan"};

Query whereInQuery = citiesRef.WhereIn("country", countriesList);
سي #
Query query = citiesRef.WhereIn("Country", new[] { "USA", "Japan" });
روبي
cities_ref = firestore.col collection_path
usr_or_japan = cities_ref.where "country", "in", ["USA", "Japan"]

يقوم هذا الاستعلام بإرجاع كل مستند city حيث يتم تعيين حقل country إلى USA أو Japan . من بيانات المثال ، يتضمن ذلك مستندات SF و LA و DC و TOK .

not-in

استخدم عامل التشغيل not-in لدمج ما يصل إلى 10 جمل غير متساوية ( != ) في نفس الحقل باستخدام AND المنطقي. يعرض الاستعلام not-in مستندات حيث يوجد الحقل المحدد ، وليس null ، ولا يتطابق مع أي من قيم المقارنة. على سبيل المثال:

Web modular API

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

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

Web namespaced API

citiesRef.where('country', 'not-in', ['USA', 'Japan']);
سويفت
ملاحظة: هذا المنتج غير متوفر في أهداف watchOS و App Clip.
citiesRef.whereField("country", notIn: ["USA", "Japan"])
ج موضوعية
ملاحظة: هذا المنتج غير متوفر في أهداف watchOS و App Clip.
[citiesRef queryWhereField:@"country" notIn:@[@"USA", @"Japan"]];

Kotlin+KTX

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

Java

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

Dart

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

Query query = citiesRef.whereNotIn("country", Arrays.asList("USA", "Japan"));
بايثون
// Snippet not yet available
C ++
cities_ref.WhereNotIn("country", std::vector<FieldValue> {
  FieldValue::String("USA"),
  FieldValue::String("Japan")
});
Node.js
const notUsaOrJapan = await citiesRef.where('country', 'not-in', ['USA', 'Japan']).get();
يذهب
// Snippet not yet available
بي أتش بي
$stateQuery = $citiesRef->where(
    'country',
    \Google\Cloud\Firestore\V1\StructuredQuery\FieldFilter\Operator::NOT_IN,
    ['USA', 'Japan']
);
وحدة
Query query = citiesRef.WhereNotIn(new FieldPath("country"), new List<string>{"USA", "Japan"});
Query query = citiesRef.WhereNotIn("country", new List<object>(){"USA", "Japan"});
سي #
// Snippet not yet available
روبي
cities_ref = firestore.col collection_path
usr_or_japan = cities_ref.where "country", "not_in", ["USA", "Japan"]

يُرجع هذا الاستعلام كل مستند city يوجد به حقل country ولم يتم تعيينه على USA أو Japan أو null . من بيانات المثال ، يتضمن ذلك مستندات London Hong Kong .

تستبعد الاستعلامات not-in المستندات التي لا يوجد بها الحقل المحدد. يوجد الحقل عند تعيينه على أي قيمة ، بما في ذلك سلسلة فارغة ( "" ) وقيمة null و NaN (وليس رقمًا). لاحظ أن x != null يقيّم إلى undefined . لا يتطابق استعلام not-in مع قيمة null كإحدى قيم المقارنة مع أي مستندات.

array-contains-any

استخدم array-contains-any عامل لدمج جمل array-contains متعددة في نفس الحقل باستخدام OR المنطقي. يعرض array-contains-any استعلام مستندات حيث يكون الحقل المحدد عبارة عن مصفوفة تحتوي على واحدة أو أكثر من قيم المقارنة:

Web modular API

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

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

Web namespaced API

citiesRef.where('regions', 'array-contains-any',
    ['west_coast', 'east_coast']);
سويفت
ملاحظة: هذا المنتج غير متوفر في أهداف watchOS و App Clip.
let citiesRef = db.collection("cities")
citiesRef.whereField("regions", arrayContainsAny: ["west_coast", "east_coast"])
ج موضوعية
ملاحظة: هذا المنتج غير متوفر في أهداف watchOS و App Clip.
FIRCollectionReference *citiesRef = [self.db collectionWithPath:@"cities"];

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

Kotlin+KTX

val citiesRef = db.collection("cities")

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

Java

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

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

Dart

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

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

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

Python

cities_ref = db.collection("cities")

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

cities_ref.WhereArrayContainsAny("region", std::vector<FieldValue> {
  FieldValue::String("west_coast"),
  FieldValue::String("east_coast")
});
Node.js
const coastalCities = await citiesRef.where('regions', 'array-contains-any',
    ['west_coast', 'east_coast']).get();
يذهب
cities := client.Collection("cities")
query := cities.Where("regions", "array-contains-any", []string{"west_coast", "east_coast"}).Documents(ctx)
بي أتش بي
$containsQuery = $citiesRef->where('regions', 'array-contains-any', ['west_coast', 'east_coast']);
وحدة
Query query = citiesRef.WhereArrayContainsAny(
                         "regions",
                         new List<object>()
                         {
                            new List<object>(){"west_coast"},
                            new List<object>(){"east_coast"}});
سي #
Query query = citiesRef.WhereArrayContainsAny("Regions", new[] { "west_coast", "east_coast" });
روبي
cities_ref = firestore.col collection_path
costal_cities = cities_ref.where "regions", "array-contains-any", ["west_coast", "east_coast"]

يقوم هذا الاستعلام بإرجاع كل وثيقة مدينة يكون فيها حقل regions عبارة عن مصفوفة تحتوي على west_coast أو east_coast . من بيانات المثال ، يتضمن ذلك مستندات SF و LA و DC .

النتائج من array-contains-any يتم حذفها. حتى إذا كان حقل مصفوفة المستند يتطابق مع أكثر من قيمة من قيم المقارنة ، فإن مجموعة النتائج تتضمن هذا المستند مرة واحدة فقط.

array-contains-any عوامل تصفية دائمًا حسب نوع بيانات المصفوفة. على سبيل المثال ، لن يقوم الاستعلام أعلاه بإرجاع مستند مدينة حيث بدلاً من المصفوفة ، يكون حقل regions هو السلسلة west_coast .

يمكنك استخدام قيمة مصفوفة كقيمة مقارنة لـ in ، ولكن بخلاف array-contains-any ، تتطابق الجملة مع مطابقة تامة لطول المصفوفة والترتيب والقيم. على سبيل المثال:

Web modular API

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

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

Web namespaced API

citiesRef.where('regions', 'in',
    [['west_coast', 'east_coast']]);
سويفت
ملاحظة: هذا المنتج غير متوفر في أهداف watchOS و App Clip.
citiesRef.whereField("regions", in: [["west_coast"], ["east_coast"]])
ج موضوعية
ملاحظة: هذا المنتج غير متوفر في أهداف watchOS و App Clip.
[citiesRef queryWhereField:@"regions" in:@[@[@"west_coast"], @[@"east_coast"]]];

Kotlin+KTX

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

Java

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

Dart

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

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

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

Python

cities_ref = db.collection("cities")

query = cities_ref.where("regions", "in", [["west_coast"], ["east_coast"]])
return query
C ++
cities_ref.WhereIn("region", std::vector<FieldValue> {
  FieldValue::String("west_coast"),
  FieldValue::String("east_coast")
});
Node.js
const exactlyOneCoast = await citiesRef.where('regions', 'in',
    [['west_coast', 'east_coast']]).get();
يذهب
cities := client.Collection("cities")
query := cities.Where("regions", "in", [][]string{{"west_coast"}, {"east_coast"}}).Documents(ctx)
بي أتش بي
$rangeQuery = $citiesRef->where('regions', 'in', [['west_coast'], ['east_coast']]);
وحدة
// Not yet supported in the Unity SDK
سي #
Query query = citiesRef.WhereIn("Regions",
    new[] { new[] { "west_coast" }, new[] { "east_coast" } });
روبي
cities_ref = firestore.col collection_path
exactly_one_cost = cities_ref.where "regions", "in", [["west_coast"], ["east_coast"]]

يقوم هذا الاستعلام بإرجاع كل مستند مدينة حيث يكون حقل regions عبارة عن مصفوفة تحتوي على عنصر واحد بالضبط إما من west_coast أو east_coast . من البيانات النموذجية ، يتأهل مستند DC فقط مع مجال regions الخاص به من ["east_coast"] . مستند SF ، مع ذلك ، لا يتطابق لأن حقل regions هو ["west_coast", "norcal"] .

محددات

لاحظ القيود التالية لـ in و not-in و array-contains-any :

  • يوفر Cloud Firestore دعمًا للاستعلامات المنطقية OR من خلال or ، في ، in ، وفي array-contains-any مشغلين. تقتصر طلبات البحث هذه على 30 فصلًا استنادًا إلى النموذج العادي المنفصل للاستعلام .
  • يمكنك استخدام array-contains واحدة على الأكثر لكل فصل ( or مجموعة). لا يمكنك دمج array-contains على array-contains-any في نفس الفصل.
  • لا يمكنك الجمع بين not-in و not يساوي != .
  • يدعم not-in ما يصل إلى 10 قيم مقارنة.
  • لا يمكنك ترتيب الاستعلام الخاص بك من خلال حقل مضمن في المساواة ( == ) أو in بند.

استعلامات المركب ( AND )

يمكنك دمج القيود مع منطقية AND عن طريق ربط العديد من عوامل المساواة ( == أو array-contains ). ومع ذلك ، يجب عليك إنشاء فهرس مركب لدمج عوامل المساواة مع عوامل عدم المساواة ، < ، <= ، > ، و != .

Web modular API

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));

Web namespaced API

const q1 = citiesRef.where("state", "==", "CO").where("name", "==", "Denver");
const q2 = citiesRef.where("state", "==", "CA").where("population", "<", 1000000);
سويفت
ملاحظة: هذا المنتج غير متوفر في أهداف watchOS و App Clip.
citiesRef
    .whereField("state", isEqualTo: "CO")
    .whereField("name", isEqualTo: "Denver")
citiesRef
    .whereField("state", isEqualTo: "CA")
    .whereField("population", isLessThan: 1000000)
ج موضوعية
ملاحظة: هذا المنتج غير متوفر في أهداف watchOS و App Clip.
[[citiesRef queryWhereField:@"state" isEqualTo:@"CO"]
    queryWhereField:@"name" isGreaterThanOrEqualTo:@"Denver"];
[[citiesRef queryWhereField:@"state" isEqualTo:@"CA"]
    queryWhereField:@"population" isLessThan:@1000000];

Kotlin+KTX

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

Java

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

Dart

final citiesRef = db.collection("cities");
citiesRef
    .where("state", isEqualTo: "CO")
    .where("name", isEqualTo: "Denver");
citiesRef
    .where("state", isEqualTo: "CA")
    .where("population", isLessThan: 1000000);
جافا
Query chainedQuery1 = cities.whereEqualTo("state", "CO").whereEqualTo("name", "Denver");
بايثون
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)

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
)
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));
Node.js
citiesRef.where('state', '==', 'CO').where('name', '==', 'Denver');
citiesRef.where('state', '==', 'CA').where('population', '<', 1000000);
يذهب
denverQuery := cities.Where("name", "==", "Denver").Where("state", "==", "CO")
caliQuery := cities.Where("state", "==", "CA").Where("population", "<=", 1000000)
query := cities.Where("country", "==", "USA").Where("population", ">", 5000000)
بي أتش بي
$chainedQuery = $citiesRef
    ->where('state', '=', 'CA')
    ->where('name', '=', 'San Francisco');
وحدة
Query chainedQuery = citiesRef
    .WhereEqualTo("State", "CA")
    .WhereEqualTo("Name", "San Francisco");
سي #
Query chainedQuery = citiesRef
    .WhereEqualTo("State", "CA")
    .WhereEqualTo("Name", "San Francisco");
روبي
chained_query = cities_ref.where("state", "=", "CA").where("name", "=", "San Francisco")

يمكنك إجراء مقارنات النطاق ( < ، <= ، > ، >= ) أو لا يساوي ( != ) مقارنات فقط في حقل واحد ، ويمكنك تضمين أي array-contains واحدة أو array-contains-any في استعلام مركب :

صالح : مرشحات النطاق في حقل واحد فقط

Web modular API

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));

Web namespaced API

const q1 = citiesRef.where("state", ">=", "CA").where("state", "<=", "IN");
const q2 = citiesRef.where("state", "==", "CA").where("population", ">", 1000000);
سويفت
ملاحظة: هذا المنتج غير متوفر في أهداف watchOS و App Clip.
citiesRef
    .whereField("state", isGreaterThanOrEqualTo: "CA")
    .whereField("state", isLessThanOrEqualTo: "IN")
citiesRef
    .whereField("state", isEqualTo: "CA")
    .whereField("population", isGreaterThan: 1000000)
ج موضوعية
ملاحظة: هذا المنتج غير متوفر في أهداف watchOS و App Clip.
[[citiesRef queryWhereField:@"state" isGreaterThanOrEqualTo:@"CA"]
    queryWhereField:@"state" isLessThanOrEqualTo:@"IN"];
[[citiesRef queryWhereField:@"state" isEqualTo:@"CA"]
    queryWhereField:@"population" isGreaterThan:@1000000];

Kotlin+KTX

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

Java

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

Dart

final citiesRef = db.collection("cities");
citiesRef
    .where("state", isGreaterThanOrEqualTo: "CA")
    .where("state", isLessThanOrEqualTo: "IN");
citiesRef
    .where("state", isEqualTo: "CA")
    .where("population", isGreaterThan: 1000000);
جافا
Query validQuery1 =
    cities.whereGreaterThanOrEqualTo("state", "CA").whereLessThanOrEqualTo("state", "IN");
Query validQuery2 = cities.whereEqualTo("state", "CA").whereGreaterThan("population", 1000000);
بايثون
cities_ref = db.collection('cities')
cities_ref.where('state', '>=', 'CA').where('state', '<=', 'IN')

Python

cities_ref = db.collection("cities")
cities_ref.where("state", ">=", "CA").where("state", "<=", "IN")
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));
Node.js
citiesRef.where('state', '>=', 'CA').where('state', '<=', 'IN');
citiesRef.where('state', '==', 'CA').where('population', '>', 1000000);
يذهب
stateQuery := cities.Where("state", ">=", "CA").Where("state", "<", "IN")
populationQuery := cities.Where("state", "==", "CA").Where("population", ">", 1000000)
بي أتش بي
$rangeQuery = $citiesRef
    ->where('state', '>=', 'CA')
    ->where('state', '<=', 'IN');
وحدة
Query rangeQuery = citiesRef
    .WhereGreaterThanOrEqualTo("State", "CA")
    .WhereLessThanOrEqualTo("State", "IN");
سي #
Query rangeQuery = citiesRef
    .WhereGreaterThanOrEqualTo("State", "CA")
    .WhereLessThanOrEqualTo("State", "IN");
روبي
range_query = cities_ref.where("state", ">=", "CA").where("state", "<=", "IN")

غير صالح : فلاتر النطاق في حقول مختلفة

Web modular API

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

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

Web namespaced API

citiesRef.where("state", ">=", "CA").where("population", ">", 100000);
سويفت
ملاحظة: هذا المنتج غير متوفر في أهداف watchOS و App Clip.
ملاحظة: هذا المنتج غير متوفر في أهداف watchOS و App Clip.
citiesRef
    .whereField("state", isGreaterThanOrEqualTo: "CA")
    .whereField("population", isGreaterThan: 1000000)
ج موضوعية
ملاحظة: هذا المنتج غير متوفر في أهداف watchOS و App Clip.
[[citiesRef queryWhereField:@"state" isGreaterThanOrEqualTo:@"CA"]
    queryWhereField:@"population" isGreaterThan:@1000000];

Kotlin+KTX

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

Java

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

Dart

final citiesRef = db.collection("cities");
citiesRef
    .where("state", isGreaterThanOrEqualTo: "CA")
    .where("population", isGreaterThan: 1000000);
جافا
Query invalidRangeQuery =
    cities.whereGreaterThanOrEqualTo("state", "CA").whereGreaterThan("population", 100000);
بايثون
cities_ref = db.collection('cities')
cities_ref.where(
    'state', '>=', 'CA').where('population', '>=', 1000000)

Python

cities_ref = db.collection("cities")
cities_ref.where("state", ">=", "CA").where("population", ">=", 1000000)
C ++
// BAD EXAMPLE -- will crash the program:
cities_ref.WhereGreaterThanOrEqualTo("state", FieldValue::String("CA"))
    .WhereGreaterThan("population", FieldValue::Integer(100000));
Node.js
citiesRef.where('state', '>=', 'CA').where('population', '>', 1000000);
يذهب
query := cities.Where("state", ">=", "CA").Where("population", ">", 1000000)
بي أتش بي
$invalidRangeQuery = $citiesRef
    ->where('state', '>=', 'CA')
    ->where('population', '>', 1000000);
وحدة
Query invalidRangeQuery = citiesRef
    .WhereGreaterThanOrEqualTo("State", "CA")
    .WhereGreaterThan("Population", 1000000);
سي #
Query invalidRangeQuery = citiesRef
    .WhereGreaterThanOrEqualTo("State", "CA")
    .WhereGreaterThan("Population", 1000000);
روبي
invalid_range_query = cities_ref.where("state", ">=", "CA").where("population", ">", 1_000_000)

استفسارات OR

يمكنك دمج القيود مع منطقي OR . على سبيل المثال:

Web modular API

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

Web namespaced API

غير متاح.

سويفت
let query = db.collection("cities").whereFilter(Filter.orFilter([
                Filter.whereField("capital", isEqualTo: true),
                Filter.whereField("population", isGreaterThanOrEqualTo: 1000000);
            ]))
  
ج موضوعية
  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

المقتطف غير متوفر.

جافا

المقتطف غير متوفر.

بايثون
from google.cloud import firestore
from google.cloud.firestore_v1.base_query import FieldFilter, Or


def query_or_composite_filter(project_id: str) -> None:
    # Instantiate the Firestore client
    client = firestore.Client(project=project_id)
    col_ref = client.collection("users")

    filter_1 = FieldFilter("birthYear", "==", 1906)
    filter_2 = FieldFilter("birthYear", "==", 1912)

    # Create the union filter of the two filters (queries)
    or_filter = Or(filters=[filter_1, filter_2])

    # Execute the query
    docs = col_ref.where(filter=or_filter).stream()

    print("Documents found:")
    for doc in docs:
        print(f"ID: {doc.id}")

Python

المقتطف غير متوفر.

C ++

المقتطف غير متوفر.

Node.js
const bigCities = await citiesRef
  .where(
    Filter.or(
      Filter.where('capital', '==', true),
      Filter.where('population', '>=', 1000000)
    )
  )
  .get();
يذهب
import (
	"context"
	"fmt"
	"io"

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

func queryFilterOr(w io.Writer, projectId string) error {
	// Instantiate a client
	ctx := context.Background()
	client, err := firestore.NewClient(ctx, projectId)
	if err != nil {
		return err
	}
	// always be sure to close the client to release resources
	defer client.Close()

	q1 := firestore.PropertyFilter{
		Path:     "birthYear",
		Operator: "==",
		Value:    1906,
	}

	q2 := firestore.PropertyFilter{
		Path:     "birthYear",
		Operator: "==",
		Value:    1815,
	}

	orFilter := firestore.OrFilter{
		Filters: []firestore.EntityFilter{q1, q2},
	}

	orQuery := client.Collection("users").WhereEntity(orFilter)
	it := orQuery.Documents(ctx)
	if err != nil {
		return err
	}

	fmt.Fprint(w, "Individual documents:\n")
	for {
		doc, err := it.Next()
		if err == iterator.Done {
			break
		}
		if err != nil {
			return fmt.Errorf("documents iterator: %w", err)
		}
		fmt.Fprintf(w, "%s: %s", doc.Ref.ID, doc.Data()["birthYear"])
	}

	return nil
}
بي أتش بي

المقتطف غير متوفر.

وحدة

المقتطف غير متوفر.

سي #

المقتطف غير متوفر.

روبي

المقتطف غير متوفر.

يستخدم Cloud Firestore فهارسك المركبة لخدمة استعلامات OR . إذا كانت فهارسك لا تدعم الاستعلام ، يقترح Cloud Firestore فهارس إضافية لقاعدة البيانات الخاصة بك .

يمكنك دمج استعلامات OR مع الاستعلامات المركبة للتصفية على مجموعات عمليات OR و" و AND ". على سبيل المثال:

Web modular API

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

Web namespaced API

غير متاح.

سويفت
ملاحظة: هذا المنتج غير متوفر في أهداف watchOS و 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);
    ])
]))
ج موضوعية
ملاحظة: هذا المنتج غير متوفر في أهداف watchOS و 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]
  ]]
]]];

Kotlin+KTX

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

Java

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

Dart

المقتطف غير متوفر.

جافا

المقتطف غير متوفر.

بايثون

المقتطف غير متوفر.

Python

المقتطف غير متوفر.

C ++

المقتطف غير متوفر.

Node.js
const bigCitiesInCalifornia = await citiesRef
  .where('state', '==', 'CA')
  .where(
    Filter.or(
      Filter.where('capital', '==', true),
      Filter.where('population', '>=', 1000000)
    )
  )
  .get();
يذهب

المقتطف غير متوفر.

بي أتش بي

المقتطف غير متوفر.

وحدة

المقتطف غير متوفر.

سي #

المقتطف غير متوفر.

روبي

المقتطف غير متوفر.

محددات

لاحظ القيود or الاستفسارات التالية:

  • يحدد Cloud Firestore الاستعلام بحد أقصى 30 فصلًا استنادًا إلى النموذج العادي المنفصل للاستعلام . من المرجح أن تصل إلى هذا الحد عند إجراء AND لمجموعات OR متعددة.
  • لا يمكنك الجمع بين not-in in array-contains-any or في نفس الاستعلام.
  • لا يمكن أن يكون لديك مساواة ( == ) ومتباينة ( < ، <= ، > ، و != ) في نفس الحقل عبر الفواصل ( or in array-contains-any ).

للحصول على وصف كامل للقيود ، راجع قيود الاستعلام .

استعلامات مجموعة المجموعة

تتكون مجموعة التجميع من جميع المجموعات التي لها نفس المعرف. بشكل افتراضي ، تسترد الاستعلامات النتائج من مجموعة واحدة في قاعدة البيانات الخاصة بك. استخدم استعلام مجموعة المجموعة لاسترداد الوثائق من مجموعة مجموعة بدلاً من مجموعة واحدة.

على سبيل المثال ، يمكنك إنشاء مجموعة مجموعة landmarks من خلال إضافة مجموعة فرعية للمعالم إلى كل مدينة:

Web modular API

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'
    })
]);

Web namespaced API

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'
    })
]);
سويفت
ملاحظة: هذا المنتج غير متوفر في أهداف watchOS و 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)
ج موضوعية
ملاحظة: هذا المنتج غير متوفر في أهداف watchOS و 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];

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)

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);

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);
جافا
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();
بايثون
cities = db.collection('cities')

sf_landmarks = cities.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.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.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.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.document('BJ').collection('landmarks')
bj_landmarks.document().set({
    'name': 'Jingshan Park',
    'type': 'park'
})
bj_landmarks.document().set({
    'name': 'Beijing Ancient Observatory',
    'type': 'museum'
})

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"}
)
C ++
// Get a new write batch
WriteBatch batch = db->batch();

DocumentReference sf_ref = db->Collection("cities").Document("SF");
batch.Set(sf_ref,{{"name", FieldValue::String("Golden Gate Bridge")}, {"type", FieldValue::String("bridge")}});
batch.Set(sf_ref,{{"name", FieldValue::String("Legion of Honor")}, {"type", FieldValue::String("museum")}});

DocumentReference la_ref = db->Collection("cities").Document("LA");
batch.Set(la_ref,{{"name", FieldValue::String("Griffith Park")}, {"type", FieldValue::String("park")}});
batch.Set(la_ref,{{"name", FieldValue::String("The Getty")}, {"type", FieldValue::String("museum")}});

DocumentReference dc_ref = db->Collection("cities").Document("DC");
batch.Set(dc_ref,{{"name", FieldValue::String("Lincoln Memorial")}, {"type", FieldValue::String("memorial")}});
batch.Set(dc_ref,{{"name", FieldValue::String("National Air and Space Museum")}, {"type", FieldValue::String("museum")}});

DocumentReference tok_ref = db->Collection("cities").Document("TOK");
batch.Set(tok_ref,{{"name", FieldValue::String("Ueno Park")}, {"type", FieldValue::String("park")}});
batch.Set(tok_ref,{{"name", FieldValue::String("National Museum of Nature and Science")}, {"type", FieldValue::String("museum")}});

DocumentReference bj_ref = db->Collection("cities").Document("BJ");
batch.Set(bj_ref,{{"name", FieldValue::String("Jingshan Park")}, {"type", FieldValue::String("park")}});
batch.Set(bj_ref,{{"name", FieldValue::String("Beijing Ancient Observatory")}, {"type", FieldValue::String("museum")}});

// Commit the batch
batch.Commit().OnCompletion([](const Future<void>& future) {
  if (future.error() == Error::kErrorOk) {
    std::cout << "Write batch success!" << std::endl;
  } else {
    std::cout << "Write batch failure: " << future.error_message() << std::endl;
  }
});
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'
});
يذهب
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: %w", 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: %w", err)
		}
	}

	return nil
}
بي أتش بي
$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);
وحدة
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;
سي #
// 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;
            }
        }
    }
}
روبي
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"
  }
)

يمكننا استخدام الاستعلام البسيط والمركب الموضح سابقًا للاستعلام عن مجموعة فرعية landmarks مدينة واحدة ، ولكن قد ترغب أيضًا في استرداد النتائج من المجموعة الفرعية landmarks كل مدينة في وقت واحد.

تتكون مجموعة مجموعة landmarks من جميع المجموعات التي تحتوي على landmarks المعرف ، ويمكنك الاستعلام عنها باستخدام استعلام مجموعة المجموعة. على سبيل المثال ، يسترد استعلام مجموعة المجموعات هذا جميع معالم museum في جميع المدن:

Web modular API

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());
});

Web namespaced API

var museums = db.collectionGroup('landmarks').where('type', '==', 'museum');
museums.get().then((querySnapshot) => {
    querySnapshot.forEach((doc) => {
        console.log(doc.id, ' => ', doc.data());
    });
});
سويفت
ملاحظة: هذا المنتج غير متوفر في أهداف watchOS و App Clip.
db.collectionGroup("landmarks").whereField("type", isEqualTo: "museum").getDocuments { (snapshot, error) in
    // ...
}
ج موضوعية
ملاحظة: هذا المنتج غير متوفر في أهداف watchOS و App Clip.
[[[self.db collectionGroupWithID:@"landmarks"] queryWhereField:@"type" isEqualTo:@"museum"]
    getDocumentsWithCompletion:^(FIRQuerySnapshot *snapshot, NSError *error) {
    // ...
}];

Kotlin+KTX

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

Java

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

Dart

db
    .collectionGroup("landmarks")
    .where("type", isEqualTo: "museum")
    .get()
    .then(
      (res) => print("Successfully completed"),
      onError: (e) => print("Error completing: $e"),
    );
جافا
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());
}
بايثون
museums = db.collection_group('landmarks')\
    .where('type', '==', 'museum')
docs = museums.stream()
for doc in docs:
    print(f'{doc.id} => {doc.to_dict()}')

Python

museums = db.collection_group("landmarks").where("type", "==", "museum")
docs = museums.stream()
async for doc in docs:
    print(f"{doc.id} => {doc.to_dict()}")
C ++
db->CollectionGroup("landmarks")
.WhereEqualTo("type", FieldValue::String("museum")).Get()
.OnCompletion([](const firebase::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;
  }
});
Node.js
const querySnapshot = await db.collectionGroup('landmarks').where('type', '==', 'museum').get();
querySnapshot.forEach((doc) => {
  console.log(doc.id, ' => ', doc.data());
});
يذهب
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: %w", 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: %w", err)
		}
		fmt.Fprintf(w, "%s: %s", doc.Ref.ID, doc.Data()["name"])
	}

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

قبل استخدام استعلام مجموعة المجموعة ، يجب عليك إنشاء فهرس يدعم استعلام مجموعة المجموعة. يمكنك إنشاء فهرس من خلال رسالة خطأ أو وحدة التحكم أو Firebase CLI .

بالنسبة إلى حزم SDK للويب والجوال ، يجب عليك أيضًا إنشاء قواعد تسمح باستعلامات مجموعة المجموعة الخاصة بك .

قيود الاستعلام

تلخص القائمة التالية قيود استعلام Cloud Firestore:

  • يوفر Cloud Firestore دعمًا للاستعلامات المنطقية OR من خلال or ، في ، in ، وفي array-contains-any مشغلين. تقتصر طلبات البحث هذه على 30 فصلًا استنادًا إلى النموذج العادي المنفصل للاستعلام .
  • في الاستعلام المركب ، يجب أن تتم تصفية كل مقارنات النطاق ( < ، <= ، > ، >= ) وليس يساوي ( != ، not-in ) في نفس الحقل.
  • يمكنك استخدام array-contains واحدة على الأكثر لكل فصل ( or مجموعة). لا يمكنك دمج array-contains على array-contains-any في نفس الفصل.
  • لا يمكنك الجمع بين not-in in array-contains-any or في نفس الاستعلام.
  • يسمح فقط not-in أو != `واحد لكل استعلام.
  • يدعم not-in ما يصل إلى 10 قيم مقارنة.
  • لا يمكنك ترتيب الاستعلام الخاص بك من خلال حقل مضمن في المساواة ( == ) أو in بند.
  • لا يمكن أن يكون لديك مساواة ( == ) ومتباينة ( < ، <= ، > ، و != ) في نفس الحقل عبر الفواصل ( or in array-contains-any ).
  • لا يمكن أن يتجاوز مجموع عوامل التصفية ، وترتيبات الفرز ، ومسار المستند الأصلي (1 لمجموعة فرعية ، و 0 لمجموعة جذر) في استعلام 100. يتم حساب هذا بناءً على النموذج العادي المنفصل للاستعلام .
  • يشير الاستعلام الذي يحتوي على عامل تصفية عدم المساواة في أحد الحقول إلى الترتيب حسب هذا الحقل وعوامل التصفية لوجود هذا الحقل .

الحدود على استعلامات OR

لمنع استعلام من أن يصبح مكلفًا للغاية من الناحية الحسابية ، يحد Cloud Firestore من عدد عبارات AND و OR التي يمكنك دمجها. لتطبيق هذا الحد ، يحول Cloud Firestore الاستعلامات التي تؤدي عمليات OR منطقية ( or in ، أو array-contains-any ) إلى نموذج عادي منفصل (يُعرف أيضًا باسم OR لـ AND s). يحد Cloud Firestore الاستعلام بحد أقصى 30 فصلًا في شكل عادي منفصل.

الشكل العادي المنفصل

يحول Cloud Firestore الاستعلامات إلى نموذج عادي منفصل عن طريق تطبيق قاعدتين:

  • تتسطح

    بالنظر إلى الشروط A و B و C :

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

  • قانون التوزيع

    بالنظر إلى الشروط A و B و C و 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)

عند تطبيق هذه القواعد على استعلامات in and array-contains-any ، تذكر أن عوامل التشغيل هذه هي اختصارات لـ OR . على سبيل المثال ، a in [1,2] هو اختصار لـ a = 1 OR a = 2 .

توضح الأمثلة التالية عدد عمليات الفصل لطلبات البحث المختلفة:

استفسار عدد الفواصل
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

الصيغة العادية المنفصلة لهذا الاستعلام تساوي الاستعلام أعلاه.

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

يُرجع هذا الاستعلام خطأ ، لأنه يتجاوز حد 30 فصلًا.

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 والوجود

عندما تطلب استعلامًا باستخدام حقل معين ، يمكن للاستعلام إرجاع المستندات التي يوجد بها حقل "ترتيب حسب" فقط.

على سبيل المثال ، لن يقوم الاستعلام التالي بإرجاع أي مستندات حيث لم يتم تعيين حقل population ، حتى إذا كانت تفي بعوامل تصفية الاستعلام.

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

التأثير المرتبط ينطبق على عدم المساواة. يشير أيضًا الاستعلام الذي يحتوي على عامل تصفية عدم المساواة في أحد الحقول إلى الترتيب حسب هذا الحقل. لا يُرجع الاستعلام التالي مستندات بدون حقل population حتى إذا كانت country = USA في ذلك المستند. كحل بديل ، يمكنك تنفيذ استعلامات منفصلة لكل طلب أو يمكنك تعيين قيمة لجميع الحقول التي تطلبها.

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

يتضمن طلب البحث أعلاه أمرًا ضمنيًا حسب عدم المساواة ويعادل ما يلي:

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

ماذا بعد؟