Wyszukiwanie tekstowe

Aby wyszukiwać określone ciągi znaków w dokumentach, użyj funkcji wyszukiwania tekstowego w Cloud Firestore.

Wymagania dotyczące wersji

Wyszukiwanie tekstowe wymaga bazy danych w wersji Firestore Enterprise.

Zanim zaczniesz

Aby przeprowadzić wyszukiwanie tekstowe, musisz najpierw utworzyć indeksy tekstowe dla pól, w których chcesz wyszukiwać.

Przeprowadzanie wyszukiwania tekstowego

Aby przeprowadzić wyszukiwanie tekstowe, użyj wyrażenia documentMatches w parametrze query etapu search(...).

Operacja wyszukuje tylko w polach indeksowanych za pomocą indeksu tekstowego. Jeśli dostępnych jest kilka indeksów, Cloud Firestore wybiera jeden indeks do użycia w operacji.

Web

const result = await execute(db.pipeline().collection('restaurants')
  .search({
    query: documentMatches('waffles')
  }));
test.firestore.js
iOS
let snapshot = try await db.pipeline().collection("restaurants")
  .search(query: DocumentMatches("waffles"))
  .execute()
PipelineSnippets.swift

Kotlin

val pipeline = db.pipeline().collection("restaurants")
    .search(SearchStage.withQuery(documentMatches("waffles")))
DocSnippets.kt

Java

Pipeline pipeline = db.pipeline().collection("restaurants")
        .search(SearchStage.withQuery(documentMatches("waffles")));
DocSnippets.java
Node.js
await db.pipeline().collection('restaurants')
  .search({
    query: documentMatches('waffles')
  })
  .execute();
test.firestore.js
Python
from google.cloud.firestore_v1.pipeline_expressions import DocumentMatches

results = (
    client.pipeline()
    .collection("restaurants")
    .search(DocumentMatches("waffles"))
    .execute()
)
firestore_pipelines.py
Java
Pipeline.Snapshot results1 =
    firestore.pipeline().collection("restaurants")
        .search(Search.withQuery(documentMatches("waffles")))
        .execute().get();
PipelineSnippets.java
Go
snapshot := client.Pipeline().
	Collection("restaurants").
	Search(firestore.WithSearchQuery(firestore.DocumentMatches("waffles"))).
	Execute(ctx)
pipeline_snippets_search.go

Wyszukiwanie dokładnego terminu

Aby wyszukać dokładny termin, umieść go w cudzysłowie ("):

Web

const result = await execute(db.pipeline().collection('restaurants')
  .search({
    query: documentMatches('"belgian waffles"')
  }));
test.firestore.js
iOS
let snapshot = try await db.pipeline().collection("restaurants")
  .search(query: DocumentMatches("\"belgian waffles\""))
  .execute()
PipelineSnippets.swift

Kotlin

val pipeline = db.pipeline().collection("restaurants")
    .search(SearchStage.withQuery(documentMatches("\"belgian waffles\"")))
DocSnippets.kt

Java

Pipeline pipeline = db.pipeline().collection("restaurants")
        .search(SearchStage.withQuery(documentMatches("\"belgian waffles\"")));
DocSnippets.java
Node.js
await db.pipeline().collection('restaurants')
  .search({
    query: documentMatches('"belgian waffles"')
  })
  .execute();
test.firestore.js
Python
from google.cloud.firestore_v1.pipeline_expressions import DocumentMatches

results = (
    client.pipeline()
    .collection("restaurants")
    .search(DocumentMatches('"belgian waffles"'))
    .execute()
)
firestore_pipelines.py
Java
Pipeline.Snapshot results2 =
    firestore.pipeline().collection("restaurants")
        .search(Search.withQuery(documentMatches("\"belgian waffles\"")))
        .execute().get();
PipelineSnippets.java
Go
snapshot := client.Pipeline().
	Collection("restaurants").
	Search(firestore.WithSearchQuery(firestore.DocumentMatches("\"belgian waffles\""))).
	Execute(ctx)
pipeline_snippets_search.go

Wyszukiwanie kombinacji terminów

Aby wyszukać kombinację terminów (logiczne AND), oddziel terminy spacjami:

Web

const result = await execute(db.pipeline().collection('restaurants')
  .search({
    query: documentMatches('waffles eggs')
  }));
test.firestore.js
iOS
let snapshot = try await db.pipeline().collection("restaurants")
  .search(query: DocumentMatches("waffles eggs"))
  .execute()
PipelineSnippets.swift

Kotlin

val pipeline = db.pipeline().collection("restaurants")
    .search(SearchStage.withQuery(documentMatches("waffles eggs")))
DocSnippets.kt

Java

Pipeline pipeline = db.pipeline().collection("restaurants")
        .search(SearchStage.withQuery(documentMatches("waffles eggs")));
DocSnippets.java
Node.js
await db.pipeline().collection('restaurants')
  .search({
    query: documentMatches('waffles eggs')
  })
  .execute();
test.firestore.js
Python
from google.cloud.firestore_v1.pipeline_expressions import DocumentMatches

results = (
    client.pipeline()
    .collection("restaurants")
    .search(DocumentMatches("waffles eggs"))
    .execute()
)
firestore_pipelines.py
Java
firestore.collection("restaurants").add(new HashMap<String, Object>() {{
  put("name", "Morning Diner");
  put("description", "Start your day with waffles and eggs.");
}});
Pipeline.Snapshot results3 =
    firestore.pipeline().collection("restaurants")
        .search(Search.withQuery(documentMatches("waffles eggs")))
        .execute().get();
PipelineSnippets.java
Go
snapshot := client.Pipeline().
	Collection("restaurants").
	Search(firestore.WithSearchQuery(firestore.DocumentMatches("waffles eggs"))).
	Execute(ctx)
pipeline_snippets_search.go

Wykluczanie terminu

Aby wykluczyć termin, dodaj przed nim łącznik (-):

Web

const result = await execute(db.pipeline().collection('restaurants')
  .search({
    query: documentMatches('coffee -waffles')
  }));
test.firestore.js
iOS
let snapshot = try await db.pipeline().collection("restaurants")
  .search(query: DocumentMatches("coffee -waffles"))
  .execute()
PipelineSnippets.swift

Kotlin

val pipeline = db.pipeline().collection("restaurants")
    .search(SearchStage.withQuery(documentMatches("waffles eggs")))
DocSnippets.kt

Java

Pipeline pipeline = db.pipeline().collection("restaurants")
        .search(SearchStage.withQuery(documentMatches("coffee -waffles")));
DocSnippets.java
Node.js
await db.pipeline().collection('restaurants')
  .search({
    query: documentMatches('-waffles')
  })
  .execute();
test.firestore.js
Python
from google.cloud.firestore_v1.pipeline_expressions import DocumentMatches

results = (
    client.pipeline()
    .collection("restaurants")
    .search(DocumentMatches("-waffles"))
    .execute()
)
firestore_pipelines.py
Java
firestore.collection("restaurants").add(new HashMap<String, Object>() {{
  put("name", "City Coffee");
  put("description", "Premium coffee and pastries.");
}});
Pipeline.Snapshot results4 =
    firestore.pipeline().collection("restaurants")
        .search(Search.withQuery(documentMatches("-waffles")))
        .execute().get();
PipelineSnippets.java
Go
snapshot := client.Pipeline().
	Collection("restaurants").
	Search(firestore.WithSearchQuery(firestore.DocumentMatches("-waffles"))).
	Execute(ctx)
pipeline_snippets_search.go

Możesz też wykluczyć frazę, np. pizza -"New York".

Sortuj wyniki

Domyślnie Cloud Firestore sortuje wyniki według czasu utworzenia dokumentu, od najnowszego do najstarszego. Możesz zamiast tego sortować według wyniku wyszukiwania, ale wymaga to więcej obliczeń, aby obliczyć i porównać dokładny wynik każdego dokumentu:

Aby posortować wyniki według wyniku wyszukiwania:

Web

const result = await execute(db.pipeline().collection('restaurants')
  .search({
    query: documentMatches('waffles'),
    sort: score().descending()
  }));
iOS
let snapshot = try await db.pipeline().collection("restaurants")
  .search(
      query: DocumentMatches("waffles"),
      sort: [Score().descending()]
      )
  .execute()

Kotlin

val pipeline = db.pipeline().collection("restaurants")
    .search(SearchStage
              .withQuery(documentMatches("waffles"))
              .withSort(score().descending())
              )
Node.js
await db.pipeline().collection('restaurants')
  .search({
    query: documentMatches('waffles'),
    sort: score().descending()
  })
  .execute();

Dodawanie pól do dokumentów zwracanych przez etap wyszukiwania

Za pomocą addFields możesz dodawać pola do dokumentów zwracanych przez etap wyszukiwania. Wyrażenia zwracające wartości obliczone na etapie wyszukiwania, takie jak score(), można używać w addFields na etapie wyszukiwania, aby zapisywać te `values w dokumentach wyjściowych.

Poniższy przykład dodaje pole score do dokumentów zwracanych przez etap wyszukiwania:

Web

const result = await execute(db.pipeline().collection('restaurants')
  .search({
    query: 'menu:waffles',
    addFields: [
        score().as('score'),
    ]
  }));
test.firestore.js
iOS
let snapshot = try await db.pipeline().collection("restaurants")
  .search(
    query: DocumentMatches("waffles"),
    addFields: [
      Score().as("score")
    ]
  )
  .execute()
PipelineSnippets.swift

Kotlin

val pipeline = db.pipeline().collection("restaurants")
    .search(SearchStage.withQuery(documentMatches("waffles eggs")))
DocSnippets.kt

Java

Pipeline pipeline = db.pipeline().collection("restaurants")
        .search(
                SearchStage.withQuery(documentMatches("menu:waffles"))
                        .withAddFields(score().alias("score")));
DocSnippets.java
Node.js
await db.pipeline().collection('restaurants')
  .search({
    query: field('menu').matches('waffles'),
    addFields: [
        score().as('score'),
    ]
  }).execute();
test.firestore.js
Python
from google.cloud.firestore_v1.pipeline_expressions import DocumentMatches, Score
from google.cloud.firestore_v1.pipeline_stages import SearchOptions

results = (
    client.pipeline()
    .collection("restaurants")
    .search(
        SearchOptions(
            query=DocumentMatches("menu:waffles"),
            add_fields=[Score().as_("score")],
        )
    )
    .execute()
)
firestore_pipelines.py
Java
Pipeline.Snapshot results5 =
    firestore.pipeline().collection("restaurants")
        .search(Search.withQuery(field("menu").regexMatch("waffles"))
            .withAddFields(score().as("score")))
        .execute().get();
PipelineSnippets.java
Go
snapshot := client.Pipeline().
	Collection("restaurants").
	Search(
		firestore.WithSearchQuery(firestore.FieldOf("menu").RegexMatch("waffles")),
		firestore.WithSearchAddFields(firestore.Score().As("score")),
	).
	Execute(ctx)
pipeline_snippets_search.go