Langkah 1: Buat buku besar baru

penting

Pemberitahuan akhir dukungan: Pelanggan yang ada akan dapat menggunakan Amazon QLDB hingga akhir dukungan pada 07/31/2025. Untuk detail selengkapnya, lihat Memigrasi QLDB Buku Besar Amazon ke Amazon Aurora Postgre. SQL

Pada langkah ini, Anda membuat QLDB buku besar Amazon baru bernamavehicle-registration.

Untuk membuat buku besar baru

1. Tinjau file berikut (Constants.ts), yang berisi nilai konstan yang digunakan oleh semua program lain dalam tutorial ini.

   /*
    * Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
    * SPDX-License-Identifier: MIT-0
    *
    * Permission is hereby granted, free of charge, to any person obtaining a copy of this
    * software and associated documentation files (the "Software"), to deal in the Software
    * without restriction, including without limitation the rights to use, copy, modify,
    * merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
    * permit persons to whom the Software is furnished to do so.
    *
    * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
    * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
    * PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
    * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
    * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
    * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
    */
   
   /**
    * Constant values used throughout this tutorial.
    */
   export const LEDGER_NAME = "vehicle-registration";
   export const LEDGER_NAME_WITH_TAGS = "tags";
   
   export const DRIVERS_LICENSE_TABLE_NAME = "DriversLicense";
   export const PERSON_TABLE_NAME = "Person";
   export const VEHICLE_REGISTRATION_TABLE_NAME = "VehicleRegistration";
   export const VEHICLE_TABLE_NAME = "Vehicle";
   
   export const GOV_ID_INDEX_NAME = "GovId";
   export const LICENSE_NUMBER_INDEX_NAME = "LicenseNumber";
   export const LICENSE_PLATE_NUMBER_INDEX_NAME = "LicensePlateNumber";
   export const PERSON_ID_INDEX_NAME = "PersonId";
   export const VIN_INDEX_NAME = "VIN";
   
   export const RETRY_LIMIT = 4;
   
   export const JOURNAL_EXPORT_S3_BUCKET_NAME_PREFIX = "qldb-tutorial-journal-export";
   export const USER_TABLES = "information_schema.user_tables";

2. Gunakan program berikut (CreateLedger.ts) untuk membuat buku besar bernamavehicle-registration.

   /*
    * Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
    * SPDX-License-Identifier: MIT-0
    *
    * Permission is hereby granted, free of charge, to any person obtaining a copy of this
    * software and associated documentation files (the "Software"), to deal in the Software
    * without restriction, including without limitation the rights to use, copy, modify,
    * merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
    * permit persons to whom the Software is furnished to do so.
    *
    * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
    * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
    * PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
    * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
    * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
    * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
    */
   
   import { QLDB } from "aws-sdk";
   import {
       CreateLedgerRequest,
       CreateLedgerResponse,
       DescribeLedgerRequest,
       DescribeLedgerResponse
   } from "aws-sdk/clients/qldb";
   
   import { LEDGER_NAME } from "./qldb/Constants";
   import { error, log } from "./qldb/LogUtil";
   import { sleep } from "./qldb/Util";
   
   const LEDGER_CREATION_POLL_PERIOD_MS = 10000;
   const ACTIVE_STATE = "ACTIVE";
   
   /**
    * Create a new ledger with the specified name.
    * @param ledgerName Name of the ledger to be created.
    * @param qldbClient The QLDB control plane client to use.
    * @returns Promise which fulfills with a CreateLedgerResponse.
    */
   export async function createLedger(ledgerName: string, qldbClient: QLDB): Promise<CreateLedgerResponse> {
       log(`Creating a ledger named: ${ledgerName}...`);
       const request: CreateLedgerRequest = {
           Name: ledgerName,
           PermissionsMode: "ALLOW_ALL"
       }
       const result: CreateLedgerResponse = await qldbClient.createLedger(request).promise();
       log(`Success. Ledger state: ${result.State}.`);
       return result;
   }
   
   /**
    * Wait for the newly created ledger to become active.
    * @param ledgerName Name of the ledger to be checked on.
    * @param qldbClient The QLDB control plane client to use.
    * @returns Promise which fulfills with a DescribeLedgerResponse.
    */
   export async function waitForActive(ledgerName: string, qldbClient: QLDB): Promise<DescribeLedgerResponse> {
       log(`Waiting for ledger ${ledgerName} to become active...`);
       const request: DescribeLedgerRequest = {
           Name: ledgerName
       }
       while (true) {
           const result: DescribeLedgerResponse = await qldbClient.describeLedger(request).promise();
           if (result.State === ACTIVE_STATE) {
               log("Success. Ledger is active and ready to be used.");
               return result;
           }
           log("The ledger is still creating. Please wait...");
           await sleep(LEDGER_CREATION_POLL_PERIOD_MS);
       }
   }
   
   /**
    * Create a ledger and wait for it to be active.
    * @returns Promise which fulfills with void.
    */
   const main = async function(): Promise<void> {
       try {
           const qldbClient: QLDB = new QLDB();
           await createLedger(LEDGER_NAME, qldbClient);
           await waitForActive(LEDGER_NAME, qldbClient);
       } catch (e) {
           error(`Unable to create the ledger: ${e}`);
       }
   }
   
   if (require.main === module) {
       main();
   }

   catatan

   • Dalam createLedger panggilan, Anda harus menentukan nama buku besar dan mode izin. Sebaiknya gunakan mode STANDARD izin untuk memaksimalkan keamanan data buku besar Anda.

   • Saat Anda membuat buku besar, perlindungan penghapusan diaktifkan secara default. Ini adalah fitur QLDB yang mencegah buku besar dihapus oleh pengguna mana pun. Anda memiliki opsi untuk menonaktifkan perlindungan penghapusan pada pembuatan buku besar menggunakan atau (). QLDB API AWS Command Line Interface AWS CLI

   • Secara opsional, Anda juga dapat menentukan tag untuk dilampirkan ke buku besar Anda.

3. Untuk menjalankan program transpiled, masukkan perintah berikut.

   node dist/CreateLedger.js

Untuk memverifikasi koneksi Anda ke buku besar baru, lanjutkan keLangkah 2: Uji konektivitas ke buku besar.