com.google.cloud.firestore.Query Java Examples

The following examples show how to use com.google.cloud.firestore.Query. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.

Example #1

Source File: FirestoreDao.java From getting-started-java with Apache License 2.0

6 votes

@Override
public Result<Book> listBooks(String startTitle) {
  Query booksQuery = booksCollection.orderBy("title").limit(10);
  if (startTitle != null) {
    booksQuery = booksQuery.startAfter(startTitle);
  }
  try {
    QuerySnapshot snapshot = booksQuery.get().get();
    List<Book> results = documentsToBooks(snapshot.getDocuments());
    String newCursor = null;
    if (results.size() > 0) {
      newCursor = results.get(results.size() - 1).getTitle();
    }
    return new Result<>(results, newCursor);
  } catch (InterruptedException | ExecutionException e) {
    e.printStackTrace();
  }
  return new Result<>(Lists.newArrayList(), null);
}

Example #2

Source File: ListenDataSnippets.java From java-docs-samples with Apache License 2.0

6 votes

/**
 * Demonstrate how to detach an event listener.
 */
void detachListener() {
  // [START detach_errors]
  Query query = db.collection("cities");
  ListenerRegistration registration = query.addSnapshotListener(
      new EventListener<QuerySnapshot>() {
        // [START_EXCLUDE]
        @Override
        public void onEvent(@Nullable QuerySnapshot snapshots,
                            @Nullable FirestoreException e) {

        }
        // [END_EXCLUDE]
      });

  // ...

  // Stop listening to changes
  registration.remove();
  // [END detach_errors]
}

Example #3

Source File: QueryDataSnippets.java From java-docs-samples with Apache License 2.0

6 votes

/** Example of a paginated query. */
List<Query> paginateCursor() throws InterruptedException, ExecutionException, TimeoutException {
  // [START fs_paginate_cursor]
  // Construct query for first 25 cities, ordered by population.
  CollectionReference cities = db.collection("cities");
  Query firstPage = cities.orderBy("population").limit(25);

  // Wait for the results of the API call, waiting for a maximum of 30 seconds for a result.
  ApiFuture<QuerySnapshot> future = firstPage.get();
  List<QueryDocumentSnapshot> docs = future.get(30, TimeUnit.SECONDS).getDocuments();

  // Construct query for the next 25 cities.
  QueryDocumentSnapshot lastDoc = docs.get(docs.size() - 1);
  Query secondPage = cities.orderBy("population").startAfter(lastDoc).limit(25);

  future = secondPage.get();
  docs = future.get(30, TimeUnit.SECONDS).getDocuments();
  // [END fs_paginate_cursor]
  return Arrays.asList(firstPage, secondPage);
}

Example #4

Source File: QueryDataSnippets.java From java-docs-samples with Apache License 2.0

6 votes

/**
 * Creates queries with simple where clauses.
 *
 * @return queries
 */
List<Query> createSimpleQueries() {
  List<Query> querys = new ArrayList<>();
  CollectionReference cities = db.collection("cities");

  // [START fs_simple_queries]
  Query stateQuery = cities.whereEqualTo("state", "CA");
  Query populationQuery = cities.whereLessThan("population", 1000000L);
  Query nameQuery = cities.whereGreaterThanOrEqualTo("name", "San Francisco");
  // [END fs_simple_queries]

  querys.add(stateQuery);
  querys.add(populationQuery);
  querys.add(nameQuery);
  return querys;
}

Example #5

Source File: QueryDataSnippets.java From java-docs-samples with Apache License 2.0

6 votes

/**
 * Creates a sample query.
 *
 * @return query
 */
Query createAQuery() throws Exception {
  // [START fs_create_query]
  // 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());
  }
  // [END fs_create_query]
  return query;
}

Example #6

Source File: QueryDataSnippets.java From java-docs-samples with Apache License 2.0

6 votes

/**
 * Creates a sample query.
 *
 * @return query
 */
Query createAQueryAlternate() throws Exception {
  // [START fs_create_query_country]
  // 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());
  }
  // [END fs_create_query_country]
  return query;
}

Example #7

Source File: FirestoreDao.java From getting-started-java with Apache License 2.0

6 votes

@Override
public Result<Book> listBooksByUser(String userId, String startTitle) {
  Query booksQuery =
      booksCollection.orderBy("title").whereEqualTo(Book.CREATED_BY_ID, userId).limit(10);
  if (startTitle != null) {
    booksQuery = booksQuery.startAfter(startTitle);
  }
  try {
    QuerySnapshot snapshot = booksQuery.get().get();
    List<Book> results = documentsToBooks(snapshot.getDocuments());
    String newCursor = null;
    if (results.size() > 0) {
      newCursor = results.get(results.size() - 1).getTitle();
    }
    return new Result<>(results, newCursor);
  } catch (InterruptedException | ExecutionException e) {
    e.printStackTrace();
  }
  return new Result<>(Lists.newArrayList(), null);
}

Example #8