Paso 6: Ver el historial de revisiones de un documento - Amazon Quantum Ledger Database (Amazon QLDB)

Las traducciones son generadas a través de traducción automática. En caso de conflicto entre la traducción y la version original de inglés, prevalecerá la version en inglés.

Paso 6: Ver el historial de revisiones de un documento

Después de modificar los datos de registro de un vehículo en el paso anterior, puede consultar el historial de todos sus propietarios registrados y cualquier otro campo actualizado. En este paso, consultará el historial de revisiones de un documento en laVehicleRegistrationmesa en tuvehicle-registrationlibro mayor.

Para ver el historial de revisiones

  1. Revise el programa de instrucciones (QueryHistory.java).

    2.x
    /* * 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. */ package software.amazon.qldb.tutorial; import java.io.IOException; import java.time.Instant; import java.time.temporal.ChronoUnit; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import com.amazon.ion.IonValue; import software.amazon.qldb.Result; import software.amazon.qldb.TransactionExecutor; import software.amazon.qldb.tutorial.model.SampleData; import software.amazon.qldb.tutorial.model.VehicleRegistration; /** * Query a table's history for a particular set of documents. * * This code expects that you have AWS credentials setup per: * http://docs.aws.amazon.com/java-sdk/latest/developer-guide/setup-credentials.html */ public final class QueryHistory { public static final Logger log = LoggerFactory.getLogger(QueryHistory.class); private static final int THREE_MONTHS = 90; private QueryHistory() { } /** * In this example, query the 'VehicleRegistration' history table to find all previous primary owners for a VIN. * * @param txn * The {@link TransactionExecutor} for lambda execute. * @param vin * VIN to find previous primary owners for. * @param query * The query to find previous primary owners. * @throws IllegalStateException if failed to convert document ID to an {@link IonValue}. */ public static void previousPrimaryOwners(final TransactionExecutor txn, final String vin, final String query) { try { final String docId = VehicleRegistration.getDocumentIdByVin(txn, vin); log.info("Querying the 'VehicleRegistration' table's history using VIN: {}...", vin); final Result result = txn.execute(query, Constants.MAPPER.writeValueAsIonValue(docId)); ScanTable.printDocuments(result); } catch (IOException ioe) { throw new IllegalStateException(ioe); } } public static void main(final String... args) { final String threeMonthsAgo = Instant.now().minus(THREE_MONTHS, ChronoUnit.DAYS).toString(); final String query = String.format("SELECT data.Owners.PrimaryOwner, metadata.version " + "FROM history(VehicleRegistration, `%s`) " + "AS h WHERE h.metadata.id = ?", threeMonthsAgo); ConnectToLedger.getDriver().execute(txn -> { final String vin = SampleData.VEHICLES.get(0).getVin(); previousPrimaryOwners(txn, vin, query); }); log.info("Successfully queried history."); } }
    1.x
    /* * Copyright 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. */ package software.amazon.qldb.tutorial; import com.amazon.ion.IonValue; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import software.amazon.qldb.QldbSession; import software.amazon.qldb.Result; import software.amazon.qldb.TransactionExecutor; import software.amazon.qldb.tutorial.model.SampleData; import software.amazon.qldb.tutorial.model.VehicleRegistration; import java.io.IOException; import java.time.Instant; import java.time.temporal.ChronoUnit; import java.util.Collections; import java.util.List; /** * Query a table's history for a particular set of documents. * * This code expects that you have AWS credentials setup per: * http://docs.aws.amazon.com/java-sdk/latest/developer-guide/setup-credentials.html */ public final class QueryHistory { public static final Logger log = LoggerFactory.getLogger(QueryHistory.class); private static final int THREE_MONTHS = 90; private QueryHistory() { } /** * In this example, query the 'VehicleRegistration' history table to find all previous primary owners for a VIN. * * @param txn * The {@link TransactionExecutor} for lambda execute. * @param vin * VIN to find previous primary owners for. * @param query * The query to find previous primary owners. * @throws IllegalStateException if failed to convert document ID to an {@link IonValue}. */ public static void previousPrimaryOwners(final TransactionExecutor txn, final String vin, final String query) { try { final String docId = VehicleRegistration.getDocumentIdByVin(txn, vin); final List<IonValue> parameters = Collections.singletonList(Constants.MAPPER.writeValueAsIonValue(docId)); log.info("Querying the 'VehicleRegistration' table's history using VIN: {}...", vin); final Result result = txn.execute(query, parameters); ScanTable.printDocuments(result); } catch (IOException ioe) { throw new IllegalStateException(ioe); } } public static void main(final String... args) { final String threeMonthsAgo = Instant.now().minus(THREE_MONTHS, ChronoUnit.DAYS).toString(); final String query = String.format("SELECT data.Owners.PrimaryOwner, metadata.version " + "FROM history(VehicleRegistration, `%s`) " + "AS h WHERE h.metadata.id = ?", threeMonthsAgo); ConnectToLedger.getDriver().execute(txn -> { final String vin = SampleData.VEHICLES.get(0).getVin(); previousPrimaryOwners(txn, vin, query); }, (retryAttempt) -> log.info("Retrying due to OCC conflict...")); log.info("Successfully queried history."); } }
    nota
    • Puede ver el historial de revisiones de un documento consultando elHistorial de funcionesen la siguiente sintaxis.

      SELECT * FROM history( table_name [, `start-time` [, `end-time` ] ] ) AS h [ WHERE h.metadata.id = 'id' ]
    • LaHora de inicioyend-timeambos son opcionales. Son valores literales de Amazon Ion que se pueden indicar con acentos graves (`...`). Para obtener más información, consulte Consultar Ion con PartiQL.

    • Como práctica recomendada, calificar una consulta de historial con un intervalo de fechas (Hora de inicioyend-time) y un documento de identidad (metadata.id). Procesos de QLDBSELECTconsultas en transacciones, que están sujetas aLímite de tiempo de espera de.

      El historial de QLDB está indexado por ID de documento y no puede crear índices de historial adicionales en este momento. Las consultas de historial que incluyen una hora de inicio y una hora de finalización obtienen el beneficio de la calificación del intervalo de fechas.

  2. Compilación y laQueryHistory.javaprograma para consultar el historial de revisiones delVehicleRegistrationno válido con un objeto1N4AL11D75C109151.

Para verificar criptográficamente la revisión de un documento en elvehicle-registrationlibro mayor, siga conPaso 7: Verificar un documento en un libro mayor.