Bagikan melalui

ChangeFeedPullModelIterator interface

Paket:
@azure/cosmos

Gunakan Items.getChangeFeedIterator() untuk mengembalikan iterator yang dapat melakukan iterasi atas semua perubahan untuk kunci partisi, rentang umpan, atau seluruh kontainer.

Properti

hasMoreResults

Selalu mengembalikan true, changefeed adalah aliran tak terbatas.

Metode

getAsyncIterator()

Mendapatkan iterator asinkron yang akan menghasilkan hasil umpan perubahan.

Contoh

Dapatkan changefeed untuk seluruh kontainer dari sekarang

import { CosmosClient, ChangeFeedStartFrom } from "@azure/cosmos";

const endpoint = "https://your-account.documents.azure.com";
const key = "<database account masterkey>";
const client = new CosmosClient({ endpoint, key });

const { database } = await client.databases.createIfNotExists({ id: "Test Database" });

const { container } = await database.containers.createIfNotExists({ id: "Test Container" });

const options = { changeFeedStartFrom: ChangeFeedStartFrom.Now() };
for await (const results of container.items.getChangeFeedIterator(options).getAsyncIterator()) {
  // Process result
  for (const resource of results.result) {
    console.log(resource);
  }
}
readNext()

Mengembalikan kumpulan hasil berikutnya untuk umpan perubahan.

Contoh

import {
  CosmosClient,
  PartitionKeyDefinitionVersion,
  PartitionKeyKind,
  ChangeFeedStartFrom,
} from "@azure/cosmos";

const endpoint = "https://your-account.documents.azure.com";
const key = "<database account masterkey>";
const client = new CosmosClient({ endpoint, key });

const { database } = await client.databases.createIfNotExists({ id: "Test Database" });

const containerDefinition = {
  id: "Test Database",
  partitionKey: {
    paths: ["/name", "/address/zip"],
    version: PartitionKeyDefinitionVersion.V2,
    kind: PartitionKeyKind.MultiHash,
  },
};
const { container } = await database.containers.createIfNotExists(containerDefinition);

const partitionKey = "some-partition-Key-value";
const options = {
  changeFeedStartFrom: ChangeFeedStartFrom.Beginning(partitionKey),
};

const iterator = container.items.getChangeFeedIterator(options);

while (iterator.hasMoreResults) {
  const response = await iterator.readNext();
  // process this response
}

Detail Properti

hasMoreResults

Selalu mengembalikan true, changefeed adalah aliran tak terbatas.

hasMoreResults: boolean

Nilai Properti

boolean

Detail Metode

getAsyncIterator()

Mendapatkan iterator asinkron yang akan menghasilkan hasil umpan perubahan.

Contoh

Dapatkan changefeed untuk seluruh kontainer dari sekarang

import { CosmosClient, ChangeFeedStartFrom } from "@azure/cosmos";

const endpoint = "https://your-account.documents.azure.com";
const key = "<database account masterkey>";
const client = new CosmosClient({ endpoint, key });

const { database } = await client.databases.createIfNotExists({ id: "Test Database" });

const { container } = await database.containers.createIfNotExists({ id: "Test Container" });

const options = { changeFeedStartFrom: ChangeFeedStartFrom.Now() };
for await (const results of container.items.getChangeFeedIterator(options).getAsyncIterator()) {
  // Process result
  for (const resource of results.result) {
    console.log(resource);
  }
}

function getAsyncIterator(): AsyncIterable<ChangeFeedIteratorResponse<(T & Resource)[]>>

Mengembalikan

AsyncIterable<ChangeFeedIteratorResponse<(T & Resource)[]>>

readNext()

Mengembalikan kumpulan hasil berikutnya untuk umpan perubahan.

Contoh

import {
  CosmosClient,
  PartitionKeyDefinitionVersion,
  PartitionKeyKind,
  ChangeFeedStartFrom,
} from "@azure/cosmos";

const endpoint = "https://your-account.documents.azure.com";
const key = "<database account masterkey>";
const client = new CosmosClient({ endpoint, key });

const { database } = await client.databases.createIfNotExists({ id: "Test Database" });

const containerDefinition = {
  id: "Test Database",
  partitionKey: {
    paths: ["/name", "/address/zip"],
    version: PartitionKeyDefinitionVersion.V2,
    kind: PartitionKeyKind.MultiHash,
  },
};
const { container } = await database.containers.createIfNotExists(containerDefinition);

const partitionKey = "some-partition-Key-value";
const options = {
  changeFeedStartFrom: ChangeFeedStartFrom.Beginning(partitionKey),
};

const iterator = container.items.getChangeFeedIterator(options);

while (iterator.hasMoreResults) {
  const response = await iterator.readNext();
  // process this response
}

function readNext(): Promise<ChangeFeedIteratorResponse<(T & Resource)[]>>

Mengembalikan

Promise<ChangeFeedIteratorResponse<(T & Resource)[]>>