Langkah 3: Buat tabel, indeks, dan data sampel - Amazon Quantum Ledger Database (Amazon QLDB)

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Langkah 3: Buat tabel, indeks, dan data sampel

Saat buku besar QLDB Amazon Anda aktif dan menerima koneksi, Anda dapat mulai membuat tabel untuk data tentang kendaraan, pemiliknya, dan informasi pendaftarannya. Setelah membuat tabel dan indeks, Anda dapat memuatnya dengan data.

Pada langkah ini, Anda membuat empat tabel di vehicle-registration buku besar:

  • VehicleRegistration

  • Vehicle

  • Person

  • DriversLicense

Anda juga membuat indeks berikut.

Nama tabel Bidang
VehicleRegistration VIN
VehicleRegistration LicensePlateNumber
Vehicle VIN
Person GovId
DriversLicense LicenseNumber
DriversLicense PersonId

Saat memasukkan data sampel, Anda terlebih dahulu memasukkan dokumen ke dalam Person tabel. Kemudian, Anda menggunakan sistem yang ditetapkan id dari setiap Person dokumen untuk mengisi bidang yang sesuai dalam dokumen yang sesuaiVehicleRegistration. DriversLicense

Tip

Sebagai praktik terbaik, gunakan sistem dokumen yang ditugaskan id sebagai kunci asing. Meskipun Anda dapat menentukan bidang yang dimaksudkan untuk menjadi pengidentifikasi unik (misalnya, VIN kendaraan), pengidentifikasi unik sebenarnya dari dokumen adalah miliknya. id Bidang ini disertakan dalam metadata dokumen, yang dapat Anda kueri dalam tampilan komited (tampilan tabel yang ditentukan sistem).

Untuk informasi selengkapnya tentang tampilan di QLDB, lihat. Konsep inti Untuk mempelajari lebih lanjut tentang metadata, lihat. Melakukan Kueri Metadata Dokumen

Untuk membuat tabel dan indeks
  1. Gunakan program berikut (CreateTable.ts) untuk membuat tabel yang disebutkan sebelumnya.

    /* * 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 { QldbDriver, Result, TransactionExecutor } from "amazon-qldb-driver-nodejs"; import { getQldbDriver } from "./ConnectToLedger"; import { DRIVERS_LICENSE_TABLE_NAME, PERSON_TABLE_NAME, VEHICLE_REGISTRATION_TABLE_NAME, VEHICLE_TABLE_NAME } from "./qldb/Constants"; import { error, log } from "./qldb/LogUtil"; /** * Create multiple tables in a single transaction. * @param txn The {@linkcode TransactionExecutor} for lambda execute. * @param tableName Name of the table to create. * @returns Promise which fulfills with the number of changes to the database. */ export async function createTable(txn: TransactionExecutor, tableName: string): Promise<number> { const statement: string = `CREATE TABLE ${tableName}`; return await txn.execute(statement).then((result: Result) => { log(`Successfully created table ${tableName}.`); return result.getResultList().length; }); } /** * Create tables in a QLDB ledger. * @returns Promise which fulfills with void. */ const main = async function(): Promise<void> { try { const qldbDriver: QldbDriver = getQldbDriver(); await qldbDriver.executeLambda(async (txn: TransactionExecutor) => { Promise.all([ createTable(txn, VEHICLE_REGISTRATION_TABLE_NAME), createTable(txn, VEHICLE_TABLE_NAME), createTable(txn, PERSON_TABLE_NAME), createTable(txn, DRIVERS_LICENSE_TABLE_NAME) ]); }); } catch (e) { error(`Unable to create tables: ${e}`); } } if (require.main === module) { main(); }
    catatan

    Program ini menunjukkan bagaimana menggunakan executeLambda fungsi dalam contoh driver QLDB. Dalam contoh ini, Anda menjalankan beberapa pernyataan CREATE TABLE PartiQL dengan ekspresi lambda tunggal.

    Fungsi eksekusi ini secara implisit memulai transaksi, menjalankan semua pernyataan di lambda, dan kemudian melakukan transaksi secara otomatis.

  2. Untuk menjalankan program transpiled, masukkan perintah berikut.

    node dist/CreateTable.js
  3. Gunakan program berikut (CreateIndex.ts) untuk membuat indeks pada tabel, seperti yang dijelaskan sebelumnya.

    /* * 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 { QldbDriver, TransactionExecutor } from "amazon-qldb-driver-nodejs"; import { getQldbDriver } from "./ConnectToLedger"; import { DRIVERS_LICENSE_TABLE_NAME, GOV_ID_INDEX_NAME, LICENSE_NUMBER_INDEX_NAME, LICENSE_PLATE_NUMBER_INDEX_NAME, PERSON_ID_INDEX_NAME, PERSON_TABLE_NAME, VEHICLE_REGISTRATION_TABLE_NAME, VEHICLE_TABLE_NAME, VIN_INDEX_NAME } from "./qldb/Constants"; import { error, log } from "./qldb/LogUtil"; /** * Create an index for a particular table. * @param txn The {@linkcode TransactionExecutor} for lambda execute. * @param tableName Name of the table to add indexes for. * @param indexAttribute Index to create on a single attribute. * @returns Promise which fulfills with the number of changes to the database. */ export async function createIndex( txn: TransactionExecutor, tableName: string, indexAttribute: string ): Promise<number> { const statement: string = `CREATE INDEX on ${tableName} (${indexAttribute})`; return await txn.execute(statement).then((result) => { log(`Successfully created index ${indexAttribute} on table ${tableName}.`); return result.getResultList().length; }); } /** * Create indexes on tables in a particular ledger. * @returns Promise which fulfills with void. */ const main = async function(): Promise<void> { try { const qldbDriver: QldbDriver = getQldbDriver(); await qldbDriver.executeLambda(async (txn: TransactionExecutor) => { Promise.all([ createIndex(txn, PERSON_TABLE_NAME, GOV_ID_INDEX_NAME), createIndex(txn, VEHICLE_TABLE_NAME, VIN_INDEX_NAME), createIndex(txn, VEHICLE_REGISTRATION_TABLE_NAME, VIN_INDEX_NAME), createIndex(txn, VEHICLE_REGISTRATION_TABLE_NAME, LICENSE_PLATE_NUMBER_INDEX_NAME), createIndex(txn, DRIVERS_LICENSE_TABLE_NAME, PERSON_ID_INDEX_NAME), createIndex(txn, DRIVERS_LICENSE_TABLE_NAME, LICENSE_NUMBER_INDEX_NAME) ]); }); } catch (e) { error(`Unable to create indexes: ${e}`); } } if (require.main === module) { main(); }
  4. Untuk menjalankan program transpiled, masukkan perintah berikut.

    node dist/CreateIndex.js
Untuk memuat data ke dalam tabel
  1. Tinjau .ts file-file berikut.

    1. SampleData.ts— Berisi data sampel yang Anda masukkan ke dalam vehicle-registration tabel.

      /* * 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 { Decimal } from "ion-js"; const EMPTY_SECONDARY_OWNERS: object[] = []; export const DRIVERS_LICENSE = [ { PersonId: "", LicenseNumber: "LEWISR261LL", LicenseType: "Learner", ValidFromDate: new Date("2016-12-20"), ValidToDate: new Date("2020-11-15") }, { PersonId: "", LicenseNumber : "LOGANB486CG", LicenseType: "Probationary", ValidFromDate : new Date("2016-04-06"), ValidToDate : new Date("2020-11-15") }, { PersonId: "", LicenseNumber : "744 849 301", LicenseType: "Full", ValidFromDate : new Date("2017-12-06"), ValidToDate : new Date("2022-10-15") }, { PersonId: "", LicenseNumber : "P626-168-229-765", LicenseType: "Learner", ValidFromDate : new Date("2017-08-16"), ValidToDate : new Date("2021-11-15") }, { PersonId: "", LicenseNumber : "S152-780-97-415-0", LicenseType: "Probationary", ValidFromDate : new Date("2015-08-15"), ValidToDate : new Date("2021-08-21") } ]; export const PERSON = [ { FirstName : "Raul", LastName : "Lewis", DOB : new Date("1963-08-19"), Address : "1719 University Street, Seattle, WA, 98109", GovId : "LEWISR261LL", GovIdType : "Driver License" }, { FirstName : "Brent", LastName : "Logan", DOB : new Date("1967-07-03"), Address : "43 Stockert Hollow Road, Everett, WA, 98203", GovId : "LOGANB486CG", GovIdType : "Driver License" }, { FirstName : "Alexis", LastName : "Pena", DOB : new Date("1974-02-10"), Address : "4058 Melrose Street, Spokane Valley, WA, 99206", GovId : "744 849 301", GovIdType : "SSN" }, { FirstName : "Melvin", LastName : "Parker", DOB : new Date("1976-05-22"), Address : "4362 Ryder Avenue, Seattle, WA, 98101", GovId : "P626-168-229-765", GovIdType : "Passport" }, { FirstName : "Salvatore", LastName : "Spencer", DOB : new Date("1997-11-15"), Address : "4450 Honeysuckle Lane, Seattle, WA, 98101", GovId : "S152-780-97-415-0", GovIdType : "Passport" } ]; export const VEHICLE = [ { VIN : "1N4AL11D75C109151", Type : "Sedan", Year : 2011, Make : "Audi", Model : "A5", Color : "Silver" }, { VIN : "KM8SRDHF6EU074761", Type : "Sedan", Year : 2015, Make : "Tesla", Model : "Model S", Color : "Blue" }, { VIN : "3HGGK5G53FM761765", Type : "Motorcycle", Year : 2011, Make : "Ducati", Model : "Monster 1200", Color : "Yellow" }, { VIN : "1HVBBAANXWH544237", Type : "Semi", Year : 2009, Make : "Ford", Model : "F 150", Color : "Black" }, { VIN : "1C4RJFAG0FC625797", Type : "Sedan", Year : 2019, Make : "Mercedes", Model : "CLK 350", Color : "White" } ]; export const VEHICLE_REGISTRATION = [ { VIN : "1N4AL11D75C109151", LicensePlateNumber : "LEWISR261LL", State : "WA", City : "Seattle", ValidFromDate : new Date("2017-08-21"), ValidToDate : new Date("2020-05-11"), PendingPenaltyTicketAmount : new Decimal(9025, -2), Owners : { PrimaryOwner : { PersonId : "" }, SecondaryOwners : EMPTY_SECONDARY_OWNERS } }, { VIN : "KM8SRDHF6EU074761", LicensePlateNumber : "CA762X", State : "WA", City : "Kent", PendingPenaltyTicketAmount : new Decimal(13075, -2), ValidFromDate : new Date("2017-09-14"), ValidToDate : new Date("2020-06-25"), Owners : { PrimaryOwner : { PersonId : "" }, SecondaryOwners : EMPTY_SECONDARY_OWNERS } }, { VIN : "3HGGK5G53FM761765", LicensePlateNumber : "CD820Z", State : "WA", City : "Everett", PendingPenaltyTicketAmount : new Decimal(44230, -2), ValidFromDate : new Date("2011-03-17"), ValidToDate : new Date("2021-03-24"), Owners : { PrimaryOwner : { PersonId : "" }, SecondaryOwners : EMPTY_SECONDARY_OWNERS } }, { VIN : "1HVBBAANXWH544237", LicensePlateNumber : "LS477D", State : "WA", City : "Tacoma", PendingPenaltyTicketAmount : new Decimal(4220, -2), ValidFromDate : new Date("2011-10-26"), ValidToDate : new Date("2023-09-25"), Owners : { PrimaryOwner : { PersonId : "" }, SecondaryOwners : EMPTY_SECONDARY_OWNERS } }, { VIN : "1C4RJFAG0FC625797", LicensePlateNumber : "TH393F", State : "WA", City : "Olympia", PendingPenaltyTicketAmount : new Decimal(3045, -2), ValidFromDate : new Date("2013-09-02"), ValidToDate : new Date("2024-03-19"), Owners : { PrimaryOwner : { PersonId : "" }, SecondaryOwners : EMPTY_SECONDARY_OWNERS } } ];
    2. Util.ts- Modul utilitas yang mengimpor dari ion-js paket untuk menyediakan fungsi pembantu yang mengonversi, mengurai, dan mencetak data Amazon Ion.

      /* * 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 { Result, TransactionExecutor } from "amazon-qldb-driver-nodejs"; import { GetBlockResponse, GetDigestResponse, ValueHolder } from "aws-sdk/clients/qldb"; import { Decimal, decodeUtf8, dom, IonTypes, makePrettyWriter, makeReader, Reader, Timestamp, toBase64, Writer } from "ion-js"; import { error } from "./LogUtil"; /** * TODO: Replace this with json.stringify * Returns the string representation of a given BlockResponse. * @param blockResponse The BlockResponse to convert to string. * @returns The string representation of the supplied BlockResponse. */ export function blockResponseToString(blockResponse: GetBlockResponse): string { let stringBuilder: string = ""; if (blockResponse.Block.IonText) { stringBuilder = stringBuilder + "Block: " + blockResponse.Block.IonText + ", "; } if (blockResponse.Proof.IonText) { stringBuilder = stringBuilder + "Proof: " + blockResponse.Proof.IonText; } stringBuilder = "{" + stringBuilder + "}"; const writer: Writer = makePrettyWriter(); const reader: Reader = makeReader(stringBuilder); writer.writeValues(reader); return decodeUtf8(writer.getBytes()); } /** * TODO: Replace this with json.stringify * Returns the string representation of a given GetDigestResponse. * @param digestResponse The GetDigestResponse to convert to string. * @returns The string representation of the supplied GetDigestResponse. */ export function digestResponseToString(digestResponse: GetDigestResponse): string { let stringBuilder: string = ""; if (digestResponse.Digest) { stringBuilder += "Digest: " + JSON.stringify(toBase64(<Uint8Array> digestResponse.Digest)) + ", "; } if (digestResponse.DigestTipAddress.IonText) { stringBuilder += "DigestTipAddress: " + digestResponse.DigestTipAddress.IonText; } stringBuilder = "{" + stringBuilder + "}"; const writer: Writer = makePrettyWriter(); const reader: Reader = makeReader(stringBuilder); writer.writeValues(reader); return decodeUtf8(writer.getBytes()); } /** * Get the document IDs from the given table. * @param txn The {@linkcode TransactionExecutor} for lambda execute. * @param tableName The table name to query. * @param field A field to query. * @param value The key of the given field. * @returns Promise which fulfills with the document ID as a string. */ export async function getDocumentId( txn: TransactionExecutor, tableName: string, field: string, value: string ): Promise<string> { const query: string = `SELECT id FROM ${tableName} AS t BY id WHERE t.${field} = ?`; let documentId: string = undefined; await txn.execute(query, value).then((result: Result) => { const resultList: dom.Value[] = result.getResultList(); if (resultList.length === 0) { throw new Error(`Unable to retrieve document ID using ${value}.`); } documentId = resultList[0].get("id").stringValue(); }).catch((err: any) => { error(`Error getting documentId: ${err}`); }); return documentId; } /** * Sleep for the specified amount of time. * @param ms The amount of time to sleep in milliseconds. * @returns Promise which fulfills with void. */ export function sleep(ms: number): Promise<void> { return new Promise(resolve => setTimeout(resolve, ms)); } /** * Find the value of a given path in an Ion value. The path should contain a blob value. * @param value The Ion value that contains the journal block attributes. * @param path The path to a certain attribute. * @returns Uint8Array value of the blob, or null if the attribute cannot be found in the Ion value * or is not of type Blob */ export function getBlobValue(value: dom.Value, path: string): Uint8Array | null { const attribute: dom.Value = value.get(path); if (attribute !== null && attribute.getType() === IonTypes.BLOB) { return attribute.uInt8ArrayValue(); } return null; } /** * TODO: Replace this with json.stringify * Returns the string representation of a given ValueHolder. * @param valueHolder The ValueHolder to convert to string. * @returns The string representation of the supplied ValueHolder. */ export function valueHolderToString(valueHolder: ValueHolder): string { const stringBuilder: string = `{ IonText: ${valueHolder.IonText}}`; const writer: Writer = makePrettyWriter(); const reader: Reader = makeReader(stringBuilder); writer.writeValues(reader); return decodeUtf8(writer.getBytes()); } /** * Converts a given value to Ion using the provided writer. * @param value The value to convert to Ion. * @param ionWriter The Writer to pass the value into. * @throws Error: If the given value cannot be converted to Ion. */ export function writeValueAsIon(value: any, ionWriter: Writer): void { switch (typeof value) { case "string": ionWriter.writeString(value); break; case "boolean": ionWriter.writeBoolean(value); break; case "number": ionWriter.writeInt(value); break; case "object": if (Array.isArray(value)) { // Object is an array. ionWriter.stepIn(IonTypes.LIST); for (const element of value) { writeValueAsIon(element, ionWriter); } ionWriter.stepOut(); } else if (value instanceof Date) { // Object is a Date. ionWriter.writeTimestamp(Timestamp.parse(value.toISOString())); } else if (value instanceof Decimal) { // Object is a Decimal. ionWriter.writeDecimal(value); } else if (value === null) { ionWriter.writeNull(IonTypes.NULL); } else { // Object is a struct. ionWriter.stepIn(IonTypes.STRUCT); for (const key of Object.keys(value)) { ionWriter.writeFieldName(key); writeValueAsIon(value[key], ionWriter); } ionWriter.stepOut(); } break; default: throw new Error(`Cannot convert to Ion for type: ${(typeof value)}.`); } }
      catatan

      getDocumentIdFungsi ini menjalankan kueri yang mengembalikan ID dokumen yang ditetapkan sistem dari tabel. Untuk mempelajari selengkapnya, lihat Menggunakan klausa BY untuk query ID dokumen.

  2. Gunakan program berikut (InsertDocument.ts) untuk memasukkan data sampel ke dalam tabel Anda.

    /* * 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 { QldbDriver, Result, TransactionExecutor } from "amazon-qldb-driver-nodejs"; import { dom } from "ion-js"; import { getQldbDriver } from "./ConnectToLedger"; import { DRIVERS_LICENSE, PERSON, VEHICLE, VEHICLE_REGISTRATION } from "./model/SampleData"; import { DRIVERS_LICENSE_TABLE_NAME, PERSON_TABLE_NAME, VEHICLE_REGISTRATION_TABLE_NAME, VEHICLE_TABLE_NAME } from "./qldb/Constants"; import { error, log } from "./qldb/LogUtil"; /** * Insert the given list of documents into a table in a single transaction. * @param txn The {@linkcode TransactionExecutor} for lambda execute. * @param tableName Name of the table to insert documents into. * @param documents List of documents to insert. * @returns Promise which fulfills with a {@linkcode Result} object. */ export async function insertDocument( txn: TransactionExecutor, tableName: string, documents: object[] ): Promise<Result> { const statement: string = `INSERT INTO ${tableName} ?`; const result: Result = await txn.execute(statement, documents); return result; } /** * Handle the insertion of documents and updating PersonIds all in a single transaction. * @param txn The {@linkcode TransactionExecutor} for lambda execute. * @returns Promise which fulfills with void. */ async function updateAndInsertDocuments(txn: TransactionExecutor): Promise<void> { log("Inserting multiple documents into the 'Person' table..."); const documentIds: Result = await insertDocument(txn, PERSON_TABLE_NAME, PERSON); const listOfDocumentIds: dom.Value[] = documentIds.getResultList(); log("Updating PersonIds for 'DriversLicense' and PrimaryOwner for 'VehicleRegistration'..."); updatePersonId(listOfDocumentIds); log("Inserting multiple documents into the remaining tables..."); await Promise.all([ insertDocument(txn, DRIVERS_LICENSE_TABLE_NAME, DRIVERS_LICENSE), insertDocument(txn, VEHICLE_REGISTRATION_TABLE_NAME, VEHICLE_REGISTRATION), insertDocument(txn, VEHICLE_TABLE_NAME, VEHICLE) ]); } /** * Update the PersonId value for DriversLicense records and the PrimaryOwner value for VehicleRegistration records. * @param documentIds List of document IDs. */ export function updatePersonId(documentIds: dom.Value[]): void { documentIds.forEach((value: dom.Value, i: number) => { const documentId: string = value.get("documentId").stringValue(); DRIVERS_LICENSE[i].PersonId = documentId; VEHICLE_REGISTRATION[i].Owners.PrimaryOwner.PersonId = documentId; }); } /** * Insert documents into a table in a QLDB ledger. * @returns Promise which fulfills with void. */ const main = async function(): Promise<void> { try { const qldbDriver: QldbDriver = getQldbDriver(); await qldbDriver.executeLambda(async (txn: TransactionExecutor) => { await updateAndInsertDocuments(txn); }); } catch (e) { error(`Unable to insert documents: ${e}`); } } if (require.main === module) { main(); }
    catatan
    • Program ini menunjukkan cara memanggil execute fungsi dengan nilai parameter. Anda dapat meneruskan parameter data selain pernyataan PartiQL yang ingin Anda jalankan. Gunakan tanda tanya (?) sebagai placeholder variabel dalam string pernyataan Anda.

    • Jika sebuah INSERT pernyataan berhasil, ia mengembalikan setiap dokumen id yang disisipkan.

  3. Untuk menjalankan program transpiled, masukkan perintah berikut.

    node dist/InsertDocument.js

Selanjutnya, Anda dapat menggunakan SELECT pernyataan untuk membaca data dari tabel di vehicle-registration buku besar. Lanjut ke Langkah 4: Kueri tabel dalam buku besar.