步骤 3：创建表、索引与示例数据

当您的 Amazon QLDB 分类账处于活动状态且接受连接时，您可开始创建有关车辆、车主和注册信息的数据表。创建表和索引后，可以向其中加载数据。

在此步骤中，您将在vehicle-registration分类账中创建四个表格：

VehicleRegistration
Vehicle
Person
DriversLicense

您还可创建以下索引。

表名称	Field
`VehicleRegistration`	`VIN`
`VehicleRegistration`	`LicensePlateNumber`
`Vehicle`	`VIN`
`Person`	`GovId`
`DriversLicense`	`LicenseNumber`
`DriversLicense`	`PersonId`

插入示例数据时，首先要在 Person 表格中插入文档。然后使用系统分配的、来自每个Person文档的id填充适当VehicleRegistration 和 DriversLicense文档中的相应文档。

提示

最佳做法是使用系统分配的文档 id 作为外键。虽然您可以定义作为唯一标识符的字段（例如车辆的 VIN），但文档的真正唯一标识符是id。字段包含在文档元数据中，您可以在提交视图（系统定义的表格视图）中对其进行查询。

有关 QLDB 中的视图的更多信息，请参阅核心概念。了解有关元数据的更多信息，请参阅查询文档元数据。

设置示例数据

审查以下 .java 文件。这些模型类代表您存储在 vehicle-registration 表格中的文档。它们可在 Amazon Ion 格式之间进行序列化。

注意

Amazon QLDB 文档以 Ion 格式 (JSON 父集) 存储。因此，您可使用 FasterXML Jackson 库对 JSON 中的数据进行建模。

DriversLicense.java


/*
 * 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.model;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
import com.fasterxml.jackson.databind.annotation.JsonSerialize;
import software.amazon.qldb.tutorial.model.streams.RevisionData;

import java.time.LocalDate;

/**
 * Represents a driver's license, serializable to (and from) Ion.
 */
public final class DriversLicense implements RevisionData {
    private final String personId;
    private final String licenseNumber;
    private final String licenseType;

    @JsonSerialize(using = IonLocalDateSerializer.class)
    @JsonDeserialize(using = IonLocalDateDeserializer.class)
    private final LocalDate validFromDate;

    @JsonSerialize(using = IonLocalDateSerializer.class)
    @JsonDeserialize(using = IonLocalDateDeserializer.class)
    private final LocalDate validToDate;

    @JsonCreator
    public DriversLicense(@JsonProperty("PersonId") final String personId,
                          @JsonProperty("LicenseNumber") final String licenseNumber,
                          @JsonProperty("LicenseType") final String licenseType,
                          @JsonProperty("ValidFromDate") final LocalDate validFromDate,
                          @JsonProperty("ValidToDate") final LocalDate validToDate) {
        this.personId = personId;
        this.licenseNumber = licenseNumber;
        this.licenseType = licenseType;
        this.validFromDate = validFromDate;
        this.validToDate = validToDate;
    }

    @JsonProperty("PersonId")
    public String getPersonId() {
        return personId;
    }

    @JsonProperty("LicenseNumber")
    public String getLicenseNumber() {
        return licenseNumber;
    }

    @JsonProperty("LicenseType")
    public String getLicenseType() {
        return licenseType;
    }

    @JsonProperty("ValidFromDate")
    public LocalDate getValidFromDate() {
        return  validFromDate;
    }

    @JsonProperty("ValidToDate")
    public LocalDate getValidToDate() {
        return  validToDate;
    }

    @Override
    public String toString() {
        return "DriversLicense{" +
                "personId='" + personId + '\'' +
                ", licenseNumber='" + licenseNumber + '\'' +
                ", licenseType='" + licenseType + '\'' +
                ", validFromDate=" + validFromDate +
                ", validToDate=" + validToDate +
                '}';
    }
}

Person.java


/*
 * 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.model;

import java.time.LocalDate;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
import com.fasterxml.jackson.databind.annotation.JsonSerialize;

import software.amazon.qldb.TransactionExecutor;
import software.amazon.qldb.tutorial.Constants;
import software.amazon.qldb.tutorial.model.streams.RevisionData;

/**
 * Represents a person, serializable to (and from) Ion.
 */ 
public final class Person implements RevisionData {
    private final String firstName;
    private final String lastName;

    @JsonSerialize(using = IonLocalDateSerializer.class)
    @JsonDeserialize(using = IonLocalDateDeserializer.class)
    private final LocalDate dob;
    private final String govId;
    private final String govIdType;
    private final String address;

    @JsonCreator
    public Person(@JsonProperty("FirstName") final String firstName,
                  @JsonProperty("LastName") final String lastName,
                  @JsonProperty("DOB") final LocalDate dob,
                  @JsonProperty("GovId") final String govId,
                  @JsonProperty("GovIdType") final String govIdType,
                  @JsonProperty("Address") final String address) {
        this.firstName = firstName;
        this.lastName = lastName;
        this.dob = dob;
        this.govId = govId;
        this.govIdType = govIdType;
        this.address = address;
    }

    @JsonProperty("Address")
    public String getAddress() {
        return address;
    }

    @JsonProperty("DOB")
    public LocalDate getDob() {
        return dob;
    }

    @JsonProperty("FirstName")
    public String getFirstName() {
        return firstName;
    }

    @JsonProperty("LastName")
    public String getLastName() {
        return lastName;
    }

    @JsonProperty("GovId")
    public String getGovId() {
        return govId;
    }

    @JsonProperty("GovIdType")
    public String getGovIdType() {
        return govIdType;
    }

    /**
     * This returns the unique document ID given a specific government ID.
     *
     * @param txn
     *              A transaction executor object.
     * @param govId
     *              The government ID of a driver.
     * @return the unique document ID.
     */
    public static String getDocumentIdByGovId(final TransactionExecutor txn, final String govId) {
        return SampleData.getDocumentId(txn, Constants.PERSON_TABLE_NAME, "GovId", govId);
    }

    @Override
    public String toString() {
        return "Person{" +
                "firstName='" + firstName + '\'' +
                ", lastName='" + lastName + '\'' +
                ", dob=" + dob +
                ", govId='" + govId + '\'' +
                ", govIdType='" + govIdType + '\'' +
                ", address='" + address + '\'' +
                '}';
    }
}

VehicleRegistration.java


/*
 * 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.model;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
import com.fasterxml.jackson.databind.annotation.JsonSerialize;
import software.amazon.qldb.TransactionExecutor;
import software.amazon.qldb.tutorial.Constants;
import software.amazon.qldb.tutorial.model.streams.RevisionData;

import java.math.BigDecimal;
import java.time.LocalDate;

/**
 * Represents a vehicle registration, serializable to (and from) Ion.
 */ 
public final class VehicleRegistration implements RevisionData {

    private final String vin;
    private final String licensePlateNumber;
    private final String state;
    private final String city;
    private final BigDecimal pendingPenaltyTicketAmount;
    private final LocalDate validFromDate;
    private final LocalDate validToDate;
    private final Owners owners;

    @JsonCreator
    public VehicleRegistration(@JsonProperty("VIN") final String vin,
                               @JsonProperty("LicensePlateNumber") final String licensePlateNumber,
                               @JsonProperty("State") final String state,
                               @JsonProperty("City") final String city,
                               @JsonProperty("PendingPenaltyTicketAmount") final BigDecimal pendingPenaltyTicketAmount,
                               @JsonProperty("ValidFromDate") final LocalDate validFromDate,
                               @JsonProperty("ValidToDate") final LocalDate validToDate,
                               @JsonProperty("Owners") final Owners owners) {
        this.vin = vin;
        this.licensePlateNumber = licensePlateNumber;
        this.state = state;
        this.city = city;
        this.pendingPenaltyTicketAmount = pendingPenaltyTicketAmount;
        this.validFromDate = validFromDate;
        this.validToDate = validToDate;
        this.owners = owners;
    }

    @JsonProperty("City")
    public String getCity() {
        return city;
    }

    @JsonProperty("LicensePlateNumber")
    public String getLicensePlateNumber() {
        return licensePlateNumber;
    }

    @JsonProperty("Owners")
    public Owners getOwners() {
        return owners;
    }

    @JsonProperty("PendingPenaltyTicketAmount")
    public BigDecimal getPendingPenaltyTicketAmount() {
        return pendingPenaltyTicketAmount;
    }

    @JsonProperty("State")
    public String getState() {
        return state;
    }

    @JsonProperty("ValidFromDate")
    @JsonSerialize(using = IonLocalDateSerializer.class)
    @JsonDeserialize(using = IonLocalDateDeserializer.class)
    public LocalDate getValidFromDate() {
        return validFromDate;
    }

    @JsonProperty("ValidToDate")
    @JsonSerialize(using = IonLocalDateSerializer.class)
    @JsonDeserialize(using = IonLocalDateDeserializer.class)
    public LocalDate getValidToDate() {
        return validToDate;
    }

    @JsonProperty("VIN")
    public String getVin() {
        return vin;
    }

    /**
     * Returns the unique document ID of a vehicle given a specific VIN.
     *
     * @param txn
     *              A transaction executor object.
     * @param vin
     *              The VIN of a vehicle.
     * @return the unique document ID of the specified vehicle.
     */
    public static String getDocumentIdByVin(final TransactionExecutor txn, final String vin) {
        return SampleData.getDocumentId(txn, Constants.VEHICLE_REGISTRATION_TABLE_NAME, "VIN", vin);
    }

    @Override
    public String toString() {
        return "VehicleRegistration{" +
                "vin='" + vin + '\'' +
                ", licensePlateNumber='" + licensePlateNumber + '\'' +
                ", state='" + state + '\'' +
                ", city='" + city + '\'' +
                ", pendingPenaltyTicketAmount=" + pendingPenaltyTicketAmount +
                ", validFromDate=" + validFromDate +
                ", validToDate=" + validToDate +
                ", owners=" + owners +
                '}';
    }
}

Vehicle.java


/*
 * 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.model;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import software.amazon.qldb.tutorial.model.streams.RevisionData;

/**
 * Represents a vehicle, serializable to (and from) Ion.
 */
public final class Vehicle implements RevisionData {
    private final String vin;
    private final String type;
    private final int year;
    private final String make;
    private final String model;
    private final String color;

    @JsonCreator
    public Vehicle(@JsonProperty("VIN") final String vin,
                   @JsonProperty("Type") final String type,
                   @JsonProperty("Year") final int year,
                   @JsonProperty("Make") final String make,
                   @JsonProperty("Model") final String model,
                   @JsonProperty("Color") final String color) {
        this.vin = vin;
        this.type = type;
        this.year = year;
        this.make = make;
        this.model = model;
        this.color = color;
    }

    @JsonProperty("Color")
    public String getColor() {
        return color;
    }

    @JsonProperty("Make")
    public String getMake() {
        return make;
    }

    @JsonProperty("Model")
    public String getModel() {
        return model;
    }

    @JsonProperty("Type")
    public String getType() {
        return type;
    }

    @JsonProperty("VIN")
    public String getVin() {
        return vin;
    }

    @JsonProperty("Year")
    public int getYear() {
        return year;
    }

    @Override
    public String toString() {
        return "Vehicle{" +
                "vin='" + vin + '\'' +
                ", type='" + type + '\'' +
                ", year=" + year +
                ", make='" + make + '\'' +
                ", model='" + model + '\'' +
                ", color='" + color + '\'' +
                '}';
    }
}

Owner.java


/*
 * 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.model;

import com.fasterxml.jackson.annotation.JsonProperty;

/**
 * Represents a vehicle owner, serializable to (and from) Ion.
 */ 
public final class Owner {
    private final String personId;

    public Owner(@JsonProperty("PersonId") final String personId) {
        this.personId = personId;
    }

    @JsonProperty("PersonId")
    public String getPersonId() {
        return personId;
    }

    @Override
    public String toString() {
        return "Owner{" +
                "personId='" + personId + '\'' +
                '}';
    }
}

Owners.java


/*
 * 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.model;

import com.fasterxml.jackson.annotation.JsonProperty;

import java.util.List;

/**
 * Represents a set of owners for a given vehicle, serializable to (and from) Ion.
 */ 
public final class Owners {
    private final Owner primaryOwner;
    private final List<Owner> secondaryOwners;

    public Owners(@JsonProperty("PrimaryOwner") final Owner primaryOwner,
                  @JsonProperty("SecondaryOwners") final List<Owner> secondaryOwners) {
        this.primaryOwner = primaryOwner;
        this.secondaryOwners = secondaryOwners;
    }

    @JsonProperty("PrimaryOwner")
    public Owner getPrimaryOwner() {
        return primaryOwner;
    }

    @JsonProperty("SecondaryOwners")
    public List<Owner> getSecondaryOwners() {
        return secondaryOwners;
    }

    @Override
    public String toString() {
        return "Owners{" +
                "primaryOwner=" + primaryOwner +
                ", secondaryOwners=" + secondaryOwners +
                '}';
    }
}

DmlResultDocument.java


/*
 * 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.qldb;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;

/**
 * Contains information about an individual document inserted or modified
 * as a result of DML.
 */
public class DmlResultDocument {

    private String documentId;

    @JsonCreator
    public DmlResultDocument(@JsonProperty("documentId") final String documentId) {
        this.documentId = documentId;
    }

    public String getDocumentId() {
        return documentId;
    }

    @Override
    public String toString() {
        return "DmlResultDocument{"
            + "documentId='" + documentId + '\''
            + '}';
    }
}

RevisionData.java


/*
 * 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.model.streams;

/**
 * Allows modeling the content of all revisions as a generic revision data. Used
 * in the {@link Revision} and extended by domain models in {@link
 * software.amazon.qldb.tutorial.model} to make it easier to write the {@link
 * Revision.RevisionDataDeserializer} that must deserialize the {@link
 * Revision#data} from different domain models.
 */
public interface RevisionData { }

RevisionMetadata.java


/*
 * 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.qldb;

import com.amazon.ion.IonInt;
import com.amazon.ion.IonString;
import com.amazon.ion.IonStruct;
import com.amazon.ion.IonTimestamp;
import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.databind.annotation.JsonSerialize;
import com.fasterxml.jackson.dataformat.ion.IonTimestampSerializers;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.Date;
import java.util.Objects;

/**
 * Represents the metadata field of a QLDB Document
 */
public class RevisionMetadata {
    private static final Logger log = LoggerFactory.getLogger(RevisionMetadata.class);
    private final String id;
    private final long version;
    @JsonSerialize(using = IonTimestampSerializers.IonTimestampJavaDateSerializer.class)
    private final Date txTime;
    private final String txId;

    @JsonCreator
    public RevisionMetadata(@JsonProperty("id") final String id,
                            @JsonProperty("version") final long version,
                            @JsonProperty("txTime") final Date txTime,
                            @JsonProperty("txId") final String txId) {
        this.id = id;
        this.version = version;
        this.txTime = txTime;
        this.txId = txId;
    }

    /**
     * Gets the unique ID of a QLDB document.
     *
     * @return the document ID.
     */
    public String getId() {
        return id;
    }

    /**
     * Gets the version number of the document in the document's modification history.
     * @return the version number.
     */
    public long getVersion() {
        return version;
    }

    /**
     * Gets the time during which the document was modified.
     *
     * @return the transaction time.
     */
    public Date getTxTime() {
        return txTime;
    }

    /**
     * Gets the transaction ID associated with this document.
     *
     * @return the transaction ID.
     */
    public String getTxId() {
        return txId;
    }

    public static RevisionMetadata fromIon(final IonStruct ionStruct) {
        if (ionStruct == null) {
            throw new IllegalArgumentException("Metadata cannot be null");
        }
        try {
            IonString id = (IonString) ionStruct.get("id");
            IonInt version = (IonInt) ionStruct.get("version");
            IonTimestamp txTime = (IonTimestamp) ionStruct.get("txTime");
            IonString txId = (IonString) ionStruct.get("txId");
            if (id == null || version == null || txTime == null || txId == null) {
                throw new IllegalArgumentException("Document is missing required fields");
            }
            return new RevisionMetadata(id.stringValue(), version.longValue(), new Date(txTime.getMillis()), txId.stringValue());
        } catch (ClassCastException e) {
            log.error("Failed to parse ion document");
            throw new IllegalArgumentException("Document members are not of the correct type", e);
        }
    }

    /**
     * Converts a {@link RevisionMetadata} object to a string.
     *
     * @return the string representation of the {@link QldbRevision} object.
     */
    @Override
    public String toString() {
        return "Metadata{"
                + "id='" + id + '\''
                + ", version=" + version
                + ", txTime=" + txTime
                + ", txId='" + txId
                + '\''
                + '}';
    }

    /**
     * Check whether two {@link RevisionMetadata} objects are equivalent.
     *
     * @return {@code true} if the two objects are equal, {@code false} otherwise.
     */
    @Override
    public boolean equals(Object o) {
        if (this == o) { return true; }
        if (o == null || getClass() != o.getClass()) { return false; }
        RevisionMetadata metadata = (RevisionMetadata) o;
        return version == metadata.version
                && id.equals(metadata.id)
                && txTime.equals(metadata.txTime)
                && txId.equals(metadata.txId);
    }

    /**
     * Generate a hash code for the {@link RevisionMetadata} object.
     *
     * @return the hash code.
     */
    @Override
    public int hashCode() {
        // CHECKSTYLE:OFF - Disabling as we are generating a hashCode of multiple properties.
        return Objects.hash(id, version, txTime, txId);
        // CHECKSTYLE:ON
    }
}

QldbRevision.java


/*
 * 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.qldb;

import com.amazon.ion.IonBlob;
import com.amazon.ion.IonStruct;
import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import software.amazon.qldb.tutorial.Constants;
import software.amazon.qldb.tutorial.Verifier;

import java.io.IOException;
import java.util.Arrays;
import java.util.Objects;

/**
 * Represents a QldbRevision including both user data and metadata.
 */
public final class QldbRevision {
    private static final Logger log = LoggerFactory.getLogger(QldbRevision.class);

    private final BlockAddress blockAddress;
    private final RevisionMetadata metadata;
    private final byte[] hash;
    private final byte[] dataHash;
    private final IonStruct data;

    @JsonCreator
    public QldbRevision(@JsonProperty("blockAddress") final BlockAddress blockAddress,
                        @JsonProperty("metadata") final RevisionMetadata metadata,
                        @JsonProperty("hash") final byte[] hash,
                        @JsonProperty("dataHash") final byte[] dataHash,
                        @JsonProperty("data") final IonStruct data) {
        this.blockAddress = blockAddress;
        this.metadata = metadata;
        this.hash = hash;
        this.dataHash = dataHash;
        this.data = data;
    }

    /**
     * Gets the unique ID of a QLDB document.
     *
     * @return the {@link BlockAddress} object.
     */
    public BlockAddress getBlockAddress() {
        return blockAddress;
    }

    /**
     * Gets the metadata of the revision.
     *
     * @return the {@link RevisionMetadata} object.
     */
    public RevisionMetadata getMetadata() {
        return metadata;
    }

    /**
     * Gets the SHA-256 hash value of the revision.
     * This is equivalent to the hash of the revision metadata and data.
     *
     * @return the byte array representing the hash.
     */
    public byte[] getHash() {
        return hash;
    }

    /**
     * Gets the SHA-256 hash value of the data portion of the revision.
     * This is only present if the revision is redacted.
     *
     * @return the byte array representing the hash.
     */
    public byte[] getDataHash() {
        return dataHash;
    }

    /**
     * Gets the revision data.
     *
     * @return the revision data.
     */
    public IonStruct getData() {
        return data;
    }

    /**
     * Returns true if the revision has been redacted.
     * @return a boolean value representing the redaction status
     * of this revision.
     */
    public Boolean isRedacted() {
        return dataHash != null;
    }

    /**
     * Constructs a new {@link QldbRevision} from an {@link IonStruct}.
     *
     * The specified {@link IonStruct} must include the following fields
     *
     * - blockAddress -- a {@link BlockAddress},
     * - metadata -- a {@link RevisionMetadata},
     * - hash -- the revision's hash calculated by QLDB,
     * - dataHash -- the user data's hash calculated by QLDB (only present if revision is redacted),
     * - data -- an {@link IonStruct} containing user data in the document.
     *
     * If any of these fields are missing or are malformed, then throws {@link IllegalArgumentException}.
     *
     * If the document hash calculated from the members of the specified {@link IonStruct} does not match
     * the hash member of the {@link IonStruct} then throws {@link IllegalArgumentException}.
     *
     * @param ionStruct
     *              The {@link IonStruct} that contains a {@link QldbRevision} object.
     * @return the converted {@link QldbRevision} object.
     * @throws IOException if failed to parse parameter {@link IonStruct}.
     */
    public static QldbRevision fromIon(final IonStruct ionStruct) throws IOException {
        try {
            BlockAddress blockAddress = Constants.MAPPER.readValue(ionStruct.get("blockAddress"), BlockAddress.class);
            IonBlob revisionHash = (IonBlob) ionStruct.get("hash");
            IonStruct metadataStruct = (IonStruct) ionStruct.get("metadata");
            IonStruct data = ionStruct.get("data") == null || ionStruct.get("data").isNullValue() ?
                null : (IonStruct) ionStruct.get("data");
            IonBlob dataHash = ionStruct.get("dataHash") == null || ionStruct.get("dataHash").isNullValue() ?
                null : (IonBlob) ionStruct.get("dataHash");
            if (revisionHash == null || metadataStruct == null) {
                throw new IllegalArgumentException("Document is missing required fields");
            }
            byte[] dataHashBytes = dataHash != null ? dataHash.getBytes() : QldbIonUtils.hashIonValue(data);
            verifyRevisionHash(metadataStruct, dataHashBytes, revisionHash.getBytes());
            RevisionMetadata metadata = RevisionMetadata.fromIon(metadataStruct);
            return new QldbRevision(
                    blockAddress,
                    metadata,
                    revisionHash.getBytes(),
                    dataHash != null ? dataHash.getBytes() : null,
                    data
            );
        } catch (ClassCastException e) {
            log.error("Failed to parse ion document");
            throw new IllegalArgumentException("Document members are not of the correct type", e);
        }
    }

    /**
     * Converts a {@link QldbRevision} object to string.
     *
     * @return the string representation of the {@link QldbRevision} object.
     */
    @Override
    public String toString() {
        return "QldbRevision{" +
                "blockAddress=" + blockAddress +
                ", metadata=" + metadata +
                ", hash=" + Arrays.toString(hash) +
                ", dataHash=" + Arrays.toString(dataHash) +
                ", data=" + data +
                '}';
    }

    /**
     * Check whether two {@link QldbRevision} objects are equivalent.
     *
     * @return {@code true} if the two objects are equal, {@code false} otherwise.
     */
    @Override
    public boolean equals(final Object o) {
        if (this == o) {
            return true;
        }
        if (!(o instanceof QldbRevision)) {
            return false;
        }
        final QldbRevision that = (QldbRevision) o;
        return Objects.equals(getBlockAddress(), that.getBlockAddress())
                && Objects.equals(getMetadata(), that.getMetadata())
                && Arrays.equals(getHash(), that.getHash())
                && Arrays.equals(getDataHash(), that.getDataHash())
                && Objects.equals(getData(), that.getData());
    }

    /**
     * Create a hash code for the {@link QldbRevision} object.
     *
     * @return the hash code.
     */
    @Override
    public int hashCode() {
        // CHECKSTYLE:OFF - Disabling as we are generating a hashCode of multiple properties.
        int result = Objects.hash(blockAddress, metadata, data);
        // CHECKSTYLE:ON
        result = 31 * result + Arrays.hashCode(hash);
        return result;
    }

    /**
     * Throws an IllegalArgumentException if the hash of the revision data and metadata
     * does not match the hash provided by QLDB with the revision.
     */
    public void verifyRevisionHash() {
        // Certain internal-only system revisions only contain a hash which cannot be
        // further computed. However, these system hashes still participate to validate
        // the journal block. User revisions will always contain values for all fields
        // and can therefore have their hash computed.
        if (blockAddress == null && metadata == null && data == null && dataHash == null) {
            return;
        }

        try {
            IonStruct metadataIon = (IonStruct) Constants.MAPPER.writeValueAsIonValue(metadata);
            byte[] dataHashBytes = isRedacted() ? dataHash : QldbIonUtils.hashIonValue(data);
            verifyRevisionHash(metadataIon, dataHashBytes, hash);
        } catch (IOException e) {
            throw new IllegalArgumentException("Could not encode revision metadata to ion.", e);
        }
    }

    private static void verifyRevisionHash(IonStruct metadata, byte[] dataHash, byte[] expectedHash) {
        byte[] metadataHash = QldbIonUtils.hashIonValue(metadata);
        byte[] candidateHash = Verifier.dot(metadataHash, dataHash);
        if (!Arrays.equals(candidateHash, expectedHash)) {
            throw new IllegalArgumentException("Hash entry of QLDB revision and computed hash "
                    + "of QLDB revision do not match");
        }
    }
}

IonLocalDateDeserializer.java


/*
 * 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.model;

import com.amazon.ion.Timestamp;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;

import java.io.IOException;
import java.time.LocalDate;

/**
 * Deserializes [java.time.LocalDate] from Ion.
 */
public class IonLocalDateDeserializer extends JsonDeserializer<LocalDate> {

    @Override
    public LocalDate deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException {
        return timestampToLocalDate((Timestamp) jp.getEmbeddedObject());
    }

    private LocalDate timestampToLocalDate(Timestamp timestamp) {
        return LocalDate.of(timestamp.getYear(), timestamp.getMonth(), timestamp.getDay());
    }
}

IonLocalDateSerializer.java


/*
 * 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.model;

import com.amazon.ion.Timestamp;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.ser.std.StdScalarSerializer;
import com.fasterxml.jackson.dataformat.ion.IonGenerator;

import java.io.IOException;
import java.time.LocalDate;

/**
 * Serializes [java.time.LocalDate] to Ion.
 */
public class IonLocalDateSerializer extends StdScalarSerializer<LocalDate> {

    public IonLocalDateSerializer() {
        super(LocalDate.class);
    }

    @Override
    public void serialize(LocalDate date, JsonGenerator jsonGenerator, SerializerProvider serializerProvider) throws IOException {
        Timestamp timestamp = Timestamp.forDay(date.getYear(), date.getMonthValue(), date.getDayOfMonth());
        ((IonGenerator) jsonGenerator).writeValue(timestamp);
    }
}

查看以下文件 (SampleData.java)，该文件代表您插入 vehicle-registration 表中的示例数据。

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.model;

import com.amazon.ion.IonString;
import com.amazon.ion.IonStruct;
import com.amazon.ion.IonValue;
import java.io.IOException;
import java.math.BigDecimal;
import java.text.ParseException;
import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import software.amazon.qldb.Result;
import software.amazon.qldb.TransactionExecutor;
import software.amazon.qldb.tutorial.ConnectToLedger;
import software.amazon.qldb.tutorial.Constants;
import software.amazon.qldb.tutorial.qldb.DmlResultDocument;
import software.amazon.qldb.tutorial.qldb.QldbRevision;

/**
 * Sample domain objects for use throughout this tutorial.
 */
public final class SampleData {
    public static final DateTimeFormatter DATE_TIME_FORMAT = DateTimeFormatter.ofPattern("yyyy-MM-dd");

    public static final List<VehicleRegistration> REGISTRATIONS = Collections.unmodifiableList(Arrays.asList(
            new VehicleRegistration("1N4AL11D75C109151", "LEWISR261LL", "WA", "Seattle",
                    BigDecimal.valueOf(90.25), convertToLocalDate("2017-08-21"), convertToLocalDate("2020-05-11"),
                    new Owners(new Owner(null), Collections.emptyList())),
            new VehicleRegistration("KM8SRDHF6EU074761", "CA762X", "WA", "Kent",
                    BigDecimal.valueOf(130.75), convertToLocalDate("2017-09-14"), convertToLocalDate("2020-06-25"),
                    new Owners(new Owner(null), Collections.emptyList())),
            new VehicleRegistration("3HGGK5G53FM761765", "CD820Z", "WA", "Everett",
                    BigDecimal.valueOf(442.30), convertToLocalDate("2011-03-17"), convertToLocalDate("2021-03-24"),
                    new Owners(new Owner(null), Collections.emptyList())),
            new VehicleRegistration("1HVBBAANXWH544237", "LS477D", "WA", "Tacoma",
                    BigDecimal.valueOf(42.20), convertToLocalDate("2011-10-26"), convertToLocalDate("2023-09-25"),
                    new Owners(new Owner(null), Collections.emptyList())),
            new VehicleRegistration("1C4RJFAG0FC625797", "TH393F", "WA", "Olympia",
                    BigDecimal.valueOf(30.45), convertToLocalDate("2013-09-02"), convertToLocalDate("2024-03-19"),
                    new Owners(new Owner(null), Collections.emptyList()))
    ));

    public static final List<Vehicle> VEHICLES = Collections.unmodifiableList(Arrays.asList(
            new Vehicle("1N4AL11D75C109151", "Sedan", 2011,  "Audi", "A5", "Silver"),
            new Vehicle("KM8SRDHF6EU074761", "Sedan", 2015, "Tesla", "Model S", "Blue"),
            new Vehicle("3HGGK5G53FM761765", "Motorcycle", 2011, "Ducati", "Monster 1200", "Yellow"),
            new Vehicle("1HVBBAANXWH544237", "Semi", 2009, "Ford", "F 150", "Black"),
            new Vehicle("1C4RJFAG0FC625797", "Sedan", 2019, "Mercedes", "CLK 350", "White")
    ));

    public static final List<Person> PEOPLE = Collections.unmodifiableList(Arrays.asList(
            new Person("Raul", "Lewis", convertToLocalDate("1963-08-19"),
                    "LEWISR261LL", "Driver License",  "1719 University Street, Seattle, WA, 98109"),
            new Person("Brent", "Logan", convertToLocalDate("1967-07-03"),
                    "LOGANB486CG", "Driver License", "43 Stockert Hollow Road, Everett, WA, 98203"),
            new Person("Alexis", "Pena", convertToLocalDate("1974-02-10"),
                    "744 849 301", "SSN", "4058 Melrose Street, Spokane Valley, WA, 99206"),
            new Person("Melvin", "Parker", convertToLocalDate("1976-05-22"),
                    "P626-168-229-765", "Passport", "4362 Ryder Avenue, Seattle, WA, 98101"),
            new Person("Salvatore", "Spencer", convertToLocalDate("1997-11-15"),
                    "S152-780-97-415-0", "Passport", "4450 Honeysuckle Lane, Seattle, WA, 98101")
    ));

    public static final List<DriversLicense> LICENSES = Collections.unmodifiableList(Arrays.asList(
            new DriversLicense(null, "LEWISR261LL", "Learner",
                    convertToLocalDate("2016-12-20"), convertToLocalDate("2020-11-15")),
            new DriversLicense(null, "LOGANB486CG", "Probationary",
                    convertToLocalDate("2016-04-06"), convertToLocalDate("2020-11-15")),
            new DriversLicense(null, "744 849 301", "Full",
                    convertToLocalDate("2017-12-06"), convertToLocalDate("2022-10-15")),
            new DriversLicense(null, "P626-168-229-765", "Learner",
                    convertToLocalDate("2017-08-16"), convertToLocalDate("2021-11-15")),
            new DriversLicense(null, "S152-780-97-415-0", "Probationary",
                    convertToLocalDate("2015-08-15"), convertToLocalDate("2021-08-21"))
    ));

    private SampleData() { }

    /**
     * Converts a date string with the format 'yyyy-MM-dd' into a {@link java.util.Date} object.
     *
     * @param date
     *              The date string to convert.
     * @return {@link java.time.LocalDate} or null if there is a {@link ParseException}
     */
    public static synchronized LocalDate convertToLocalDate(String date) {
        return LocalDate.parse(date, DATE_TIME_FORMAT);
    }

    /**
     * Convert the result set into a list of IonValues.
     *
     * @param result
     *              The result set to convert.
     * @return a list of IonValues.
     */
    public static List<IonValue> toIonValues(Result result) {
        final List<IonValue> valueList = new ArrayList<>();
        result.iterator().forEachRemaining(valueList::add);
        return valueList;
    }

    /**
     * Get the document ID of a particular document.
     *
     * @param txn
     *              A transaction executor object.
     * @param tableName
     *              Name of the table containing the document.
     * @param identifier
     *              The identifier used to narrow down the search.
     * @param value
     *              Value of the identifier.
     * @return the list of document IDs in the result set.
     */
    public static String getDocumentId(final TransactionExecutor txn, final String tableName,
                                       final String identifier, final String value) {
        try {
            final List<IonValue> parameters = Collections.singletonList(Constants.MAPPER.writeValueAsIonValue(value));
            final String query = String.format("SELECT metadata.id FROM _ql_committed_%s AS p WHERE p.data.%s = ?",
                    tableName, identifier);
            Result result = txn.execute(query, parameters);
            if (result.isEmpty()) {
                throw new IllegalStateException("Unable to retrieve document ID using " + value);
            }
            return getStringValueOfStructField((IonStruct) result.iterator().next(), "id");
        } catch (IOException ioe) {
            throw new IllegalStateException(ioe);
        }
    }

    /**
     * Get the document by ID.
     *
     * @param tableName
     *              Name of the table to insert documents into.
     * @param documentId
     *              The unique ID of a document in the Person table.
     * @return a {@link QldbRevision} object.
     * @throws IllegalStateException if failed to convert parameter into {@link IonValue}.
     */
    public static QldbRevision getDocumentById(String tableName, String documentId) {
        try {
            final IonValue ionValue = Constants.MAPPER.writeValueAsIonValue(documentId);
            Result result = ConnectToLedger.getDriver().execute(txn -> {
                return txn.execute("SELECT c.* FROM _ql_committed_" + tableName + " AS c BY docId "
                                   + "WHERE docId = ?", ionValue);
            });
            if (result.isEmpty()) {
                throw new IllegalStateException("Unable to retrieve document by id " + documentId + " in table " + tableName);
            }
            return Constants.MAPPER.readValue(result.iterator().next(), QldbRevision.class);
        } catch (IOException ioe) {
            throw new IllegalStateException(ioe);
        }
    }

    /**
     * Return a list of modified document IDs as strings from a DML {@link Result}.
     *
     * @param result
     *              The result set from a DML operation.
     * @return the list of document IDs modified by the operation.
     */
    public static List<String> getDocumentIdsFromDmlResult(final Result result) {
        final List<String> strings = new ArrayList<>();
        result.iterator().forEachRemaining(row -> strings.add(getDocumentIdFromDmlResultDocument(row)));
        return strings;
    }

    /**
     * Convert the given DML result row's document ID to string.
     *
     * @param dmlResultDocument
     *              The {@link IonValue} representing the results of a DML operation.
     * @return a string of document ID.
     */
    public static String getDocumentIdFromDmlResultDocument(final IonValue dmlResultDocument) {
        try {
            DmlResultDocument result = Constants.MAPPER.readValue(dmlResultDocument, DmlResultDocument.class);
            return result.getDocumentId();
        } catch (IOException ioe) {
            throw new IllegalStateException(ioe);
        }
    }

    /**
     * Get the String value of a given {@link IonStruct} field name.
     * @param struct the {@link IonStruct} from which to get the value.
     * @param fieldName the name of the field from which to get the value.
     * @return the String value of the field within the given {@link IonStruct}.
     */
    public static String getStringValueOfStructField(final IonStruct struct, final String fieldName) {
        return ((IonString) struct.get(fieldName)).stringValue();
    }

    /**
     * Return a copy of the given driver's license with updated person Id.
     *
     * @param oldLicense
     *              The old driver's license to update.
     * @param personId
     *              The PersonId of the driver.
     * @return the updated {@link DriversLicense}.
     */
    public static DriversLicense updatePersonIdDriversLicense(final DriversLicense oldLicense, final String personId) {
        return new DriversLicense(personId, oldLicense.getLicenseNumber(), oldLicense.getLicenseType(),
                oldLicense.getValidFromDate(), oldLicense.getValidToDate());
    }

    /**
     * Return a copy of the given vehicle registration with updated person Id.
     *
     * @param oldRegistration
     *              The old vehicle registration to update.
     * @param personId
     *              The PersonId of the driver.
     * @return the updated {@link VehicleRegistration}.
     */
    public static VehicleRegistration updateOwnerVehicleRegistration(final VehicleRegistration oldRegistration,
                                                                     final String personId) {
        return new VehicleRegistration(oldRegistration.getVin(), oldRegistration.getLicensePlateNumber(),
                oldRegistration.getState(), oldRegistration.getCity(), oldRegistration.getPendingPenaltyTicketAmount(),
                oldRegistration.getValidFromDate(), oldRegistration.getValidToDate(),
                new Owners(new Owner(personId), Collections.emptyList()));
    }
}

1.x

重要

对于 Amazon Ion 软件包，您必须在应用程序中使用命名空间com.amazon.ion。AWS SDK for Java依赖于software.amazon.ion命名空间下的另一个 Ion 包，但这是一个与 QLDB 驱动程序不兼容的旧包。


/*
 * 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.model;

import com.amazon.ion.IonString;
import com.amazon.ion.IonStruct;
import com.amazon.ion.IonValue;
import software.amazon.qldb.QldbSession;
import software.amazon.qldb.Result;
import software.amazon.qldb.TransactionExecutor;
import software.amazon.qldb.tutorial.Constants;
import software.amazon.qldb.tutorial.qldb.DmlResultDocument;
import software.amazon.qldb.tutorial.qldb.QldbRevision;

import java.io.IOException;

import java.math.BigDecimal;
import java.text.ParseException;
import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;

/**
 * Sample domain objects for use throughout this tutorial.
 */
public final class SampleData {
    public static final DateTimeFormatter DATE_TIME_FORMAT = DateTimeFormatter.ofPattern("yyyy-MM-dd");

    public static final List<VehicleRegistration> REGISTRATIONS = Collections.unmodifiableList(Arrays.asList(
            new VehicleRegistration("1N4AL11D75C109151", "LEWISR261LL", "WA", "Seattle",
                    BigDecimal.valueOf(90.25), convertToLocalDate("2017-08-21"), convertToLocalDate("2020-05-11"),
                    new Owners(new Owner(null), Collections.emptyList())),
            new VehicleRegistration("KM8SRDHF6EU074761", "CA762X", "WA", "Kent",
                    BigDecimal.valueOf(130.75), convertToLocalDate("2017-09-14"), convertToLocalDate("2020-06-25"),
                    new Owners(new Owner(null), Collections.emptyList())),
            new VehicleRegistration("3HGGK5G53FM761765", "CD820Z", "WA", "Everett",
                    BigDecimal.valueOf(442.30), convertToLocalDate("2011-03-17"), convertToLocalDate("2021-03-24"),
                    new Owners(new Owner(null), Collections.emptyList())),
            new VehicleRegistration("1HVBBAANXWH544237", "LS477D", "WA", "Tacoma",
                    BigDecimal.valueOf(42.20), convertToLocalDate("2011-10-26"), convertToLocalDate("2023-09-25"),
                    new Owners(new Owner(null), Collections.emptyList())),
            new VehicleRegistration("1C4RJFAG0FC625797", "TH393F", "WA", "Olympia",
                    BigDecimal.valueOf(30.45), convertToLocalDate("2013-09-02"), convertToLocalDate("2024-03-19"),
                    new Owners(new Owner(null), Collections.emptyList()))
    ));

    public static final List<Vehicle> VEHICLES = Collections.unmodifiableList(Arrays.asList(
            new Vehicle("1N4AL11D75C109151", "Sedan", 2011,  "Audi", "A5", "Silver"),
            new Vehicle("KM8SRDHF6EU074761", "Sedan", 2015, "Tesla", "Model S", "Blue"),
            new Vehicle("3HGGK5G53FM761765", "Motorcycle", 2011, "Ducati", "Monster 1200", "Yellow"),
            new Vehicle("1HVBBAANXWH544237", "Semi", 2009, "Ford", "F 150", "Black"),
            new Vehicle("1C4RJFAG0FC625797", "Sedan", 2019, "Mercedes", "CLK 350", "White")
    ));

    public static final List<Person> PEOPLE = Collections.unmodifiableList(Arrays.asList(
            new Person("Raul", "Lewis", convertToLocalDate("1963-08-19"),
                    "LEWISR261LL", "Driver License",  "1719 University Street, Seattle, WA, 98109"),
            new Person("Brent", "Logan", convertToLocalDate("1967-07-03"),
                    "LOGANB486CG", "Driver License", "43 Stockert Hollow Road, Everett, WA, 98203"),
            new Person("Alexis", "Pena", convertToLocalDate("1974-02-10"),
                    "744 849 301", "SSN", "4058 Melrose Street, Spokane Valley, WA, 99206"),
            new Person("Melvin", "Parker", convertToLocalDate("1976-05-22"),
                    "P626-168-229-765", "Passport", "4362 Ryder Avenue, Seattle, WA, 98101"),
            new Person("Salvatore", "Spencer", convertToLocalDate("1997-11-15"),
                    "S152-780-97-415-0", "Passport", "4450 Honeysuckle Lane, Seattle, WA, 98101")
    ));

    public static final List<DriversLicense> LICENSES = Collections.unmodifiableList(Arrays.asList(
            new DriversLicense(null, "LEWISR261LL", "Learner",
                    convertToLocalDate("2016-12-20"), convertToLocalDate("2020-11-15")),
            new DriversLicense(null, "LOGANB486CG", "Probationary",
                    convertToLocalDate("2016-04-06"), convertToLocalDate("2020-11-15")),
            new DriversLicense(null, "744 849 301", "Full",
                    convertToLocalDate("2017-12-06"), convertToLocalDate("2022-10-15")),
            new DriversLicense(null, "P626-168-229-765", "Learner",
                    convertToLocalDate("2017-08-16"), convertToLocalDate("2021-11-15")),
            new DriversLicense(null, "S152-780-97-415-0", "Probationary",
                    convertToLocalDate("2015-08-15"), convertToLocalDate("2021-08-21"))
    ));

    private SampleData() { }

    /**
     * Converts a date string with the format 'yyyy-MM-dd' into a {@link java.util.Date} object.
     *
     * @param date
     *              The date string to convert.
     * @return {@link LocalDate} or null if there is a {@link ParseException}
     */
    public static synchronized LocalDate convertToLocalDate(String date) {
        return LocalDate.parse(date, DATE_TIME_FORMAT);
    }

    /**
     * Convert the result set into a list of IonValues.
     *
     * @param result
     *              The result set to convert.
     * @return a list of IonValues.
     */
    public static List<IonValue> toIonValues(Result result) {
        final List<IonValue> valueList = new ArrayList<>();
        result.iterator().forEachRemaining(valueList::add);
        return valueList;
    }

    /**
     * Get the document ID of a particular document.
     *
     * @param txn
     *              A transaction executor object.
     * @param tableName
     *              Name of the table containing the document.
     * @param identifier
     *              The identifier used to narrow down the search.
     * @param value
     *              Value of the identifier.
     * @return the list of document IDs in the result set.
     */
    public static String getDocumentId(final TransactionExecutor txn, final String tableName,
                                       final String identifier, final String value) {
        try {
            final List<IonValue> parameters = Collections.singletonList(Constants.MAPPER.writeValueAsIonValue(value));
            final String query = String.format("SELECT metadata.id FROM _ql_committed_%s AS p WHERE p.data.%s = ?",
                    tableName, identifier);
            Result result = txn.execute(query, parameters);
            if (result.isEmpty()) {
                throw new IllegalStateException("Unable to retrieve document ID using " + value);
            }
            return getStringValueOfStructField((IonStruct) result.iterator().next(), "id");
        } catch (IOException ioe) {
            throw new IllegalStateException(ioe);
        }
    }

    /**
     * Get the document by ID.
     *
     * @param qldbSession
     *              A QLDB session.
     * @param tableName
     *              Name of the table to insert documents into.
     * @param documentId
     *              The unique ID of a document in the Person table.
     * @return a {@link QldbRevision} object.
     * @throws IllegalStateException if failed to convert parameter into {@link IonValue}.
     */
    public static QldbRevision getDocumentById(QldbSession qldbSession, String tableName, String documentId) {
        try {
            final List<IonValue> parameters = Collections.singletonList(Constants.MAPPER.writeValueAsIonValue(documentId));
            final String query = String.format("SELECT c.* FROM _ql_committed_%s AS c BY docId WHERE docId = ?", tableName);
            Result result = qldbSession.execute(query, parameters);
            if (result.isEmpty()) {
                throw new IllegalStateException("Unable to retrieve document by id " + documentId + " in table " + tableName);
            }
            return Constants.MAPPER.readValue(result.iterator().next(), QldbRevision.class);
        } catch (IOException ioe) {
            throw new IllegalStateException(ioe);
        }
    }

    /**
     * Return a list of modified document IDs as strings from a DML {@link Result}.
     *
     * @param result
     *              The result set from a DML operation.
     * @return the list of document IDs modified by the operation.
     */
    public static List<String> getDocumentIdsFromDmlResult(final Result result) {
        final List<String> strings = new ArrayList<>();
        result.iterator().forEachRemaining(row -> strings.add(getDocumentIdFromDmlResultDocument(row)));
        return strings;
    }

    /**
     * Convert the given DML result row's document ID to string.
     *
     * @param dmlResultDocument
     *              The {@link IonValue} representing the results of a DML operation.
     * @return a string of document ID.
     */
    public static String getDocumentIdFromDmlResultDocument(final IonValue dmlResultDocument) {
        try {
            DmlResultDocument result = Constants.MAPPER.readValue(dmlResultDocument, DmlResultDocument.class);
            return result.getDocumentId();
        } catch (IOException ioe) {
            throw new IllegalStateException(ioe);
        }
    }

    /**
     * Get the String value of a given {@link IonStruct} field name.
     * @param struct the {@link IonStruct} from which to get the value.
     * @param fieldName the name of the field from which to get the value.
     * @return the String value of the field within the given {@link IonStruct}.
     */
    public static String getStringValueOfStructField(final IonStruct struct, final String fieldName) {
        return ((IonString) struct.get(fieldName)).stringValue();
    }

    /**
     * Return a copy of the given driver's license with updated person Id.
     *
     * @param oldLicense
     *              The old driver's license to update.
     * @param personId
     *              The PersonId of the driver.
     * @return the updated {@link DriversLicense}.
     */
    public static DriversLicense updatePersonIdDriversLicense(final DriversLicense oldLicense, final String personId) {
        return new DriversLicense(personId, oldLicense.getLicenseNumber(), oldLicense.getLicenseType(),
                oldLicense.getValidFromDate(), oldLicense.getValidToDate());
    }

    /**
     * Return a copy of the given vehicle registration with updated person Id.
     *
     * @param oldRegistration
     *              The old vehicle registration to update.
     * @param personId
     *              The PersonId of the driver.
     * @return the updated {@link VehicleRegistration}.
     */
    public static VehicleRegistration updateOwnerVehicleRegistration(final VehicleRegistration oldRegistration,
                                                                     final String personId) {
        return new VehicleRegistration(oldRegistration.getVin(), oldRegistration.getLicensePlateNumber(),
                oldRegistration.getState(), oldRegistration.getCity(), oldRegistration.getPendingPenaltyTicketAmount(),
                oldRegistration.getValidFromDate(), oldRegistration.getValidToDate(),
                new Owners(new Owner(personId), Collections.emptyList()));
    }
}

注意

该类使用 Ion 库提供辅助方法，用于将您的数据与 Ion 格式进行相互转换。
该 getDocumentId方法对带有前缀_ql_committed_的表运行查询。这是保留的前缀，表示您要查询表的已提交视图。在此视图中，您的数据嵌套至data字段中，元数据嵌套至metadata字段中。

编译并运行以下程序 (CreateTable.java) 以创建前面提到的表。

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 org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import software.amazon.qldb.Result;
import software.amazon.qldb.TransactionExecutor;
import software.amazon.qldb.tutorial.model.SampleData;

/**
 * Create tables in a QLDB ledger.
 *
 * 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 CreateTable {
    public static final Logger log = LoggerFactory.getLogger(CreateTable.class);

    private CreateTable() { }

    /**
     * Registrations, vehicles, owners, and licenses tables being created in a single transaction.
     *
     * @param txn
     *              The {@link TransactionExecutor} for lambda execute.
     * @param tableName
     *              Name of the table to be created.
     * @return the number of tables created.
     */
    public static int createTable(final TransactionExecutor txn, final String tableName) {
        log.info("Creating the '{}' table...", tableName);
        final String createTable = String.format("CREATE TABLE %s", tableName);
        final Result result = txn.execute(createTable);
        log.info("{} table created successfully.", tableName);
        return SampleData.toIonValues(result).size();
    }

    public static void main(final String... args) {
        ConnectToLedger.getDriver().execute(txn -> {
            createTable(txn, Constants.DRIVERS_LICENSE_TABLE_NAME);
            createTable(txn, Constants.PERSON_TABLE_NAME);
            createTable(txn, Constants.VEHICLE_TABLE_NAME);
            createTable(txn, Constants.VEHICLE_REGISTRATION_TABLE_NAME);
        });
    }
}

1.x


/*
 * Copyright 2020 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 org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import software.amazon.qldb.Result;
import software.amazon.qldb.TransactionExecutor;
import software.amazon.qldb.tutorial.model.SampleData;

/**
 * Create tables in a QLDB ledger.
 *
 * 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 CreateTable {
    public static final Logger log = LoggerFactory.getLogger(CreateTable.class);

    private CreateTable() { }

    /**
     * Registrations, vehicles, owners, and licenses tables being created in a single transaction.
     *
     * @param txn
     *              The {@link TransactionExecutor} for lambda execute.
     * @param tableName
     *              Name of the table to be created.
     * @return the number of tables created.
     */
    public static int createTable(final TransactionExecutor txn, final String tableName) {
        log.info("Creating the '{}' table...", tableName);
        final String createTable = String.format("CREATE TABLE %s", tableName);
        final Result result = txn.execute(createTable);
        log.info("{} table created successfully.", tableName);
        return SampleData.toIonValues(result).size();
    }

    public static void main(final String... args) {
        ConnectToLedger.getDriver().execute(txn -> {
            createTable(txn, Constants.DRIVERS_LICENSE_TABLE_NAME);
            createTable(txn, Constants.PERSON_TABLE_NAME);
            createTable(txn, Constants.VEHICLE_TABLE_NAME);
            createTable(txn, Constants.VEHICLE_REGISTRATION_TABLE_NAME);
        }, (retryAttempt) -> log.info("Retrying due to OCC conflict..."));
    }
}

注意

该程序演示了如何将 TransactionExecutor lambda 传递至execute方法。在此示例中，您使用 lambda 表达式在单个事务中运行多个CREATE TABLE PartiQL 语句。

该 execute 方法采用隐式启动事务，运行 lambda 中的所有语句，然后自动提交事务。

如前所述，编译并运行以下程序 (CreateIndex.java)，以在表上创建索引。

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 org.slf4j.Logger;
import org.slf4j.LoggerFactory;


import software.amazon.qldb.Result;
import software.amazon.qldb.TransactionExecutor;
import software.amazon.qldb.tutorial.model.SampleData;

/**
 * Create indexes on tables in a particular ledger.
 *
 * 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 CreateIndex {
    public static final Logger log = LoggerFactory.getLogger(CreateIndex.class);

    private CreateIndex() { }

    /**
     * In this example, create indexes for registrations and vehicles tables.
     *
     * @param txn
     *              The {@link TransactionExecutor} for lambda execute.
     * @param tableName
     *              Name of the table to be created.
     * @param indexAttribute
     *              The index attribute to use.
     * @return the number of tables created.
     */
    public static int createIndex(final TransactionExecutor txn, final String tableName, final String indexAttribute) {
        log.info("Creating an index on {}...", indexAttribute);
        final String createIndex = String.format("CREATE INDEX ON %s (%s)", tableName, indexAttribute);
        final Result r = txn.execute(createIndex);
        return SampleData.toIonValues(r).size();
    }

    public static void main(final String... args) {
        ConnectToLedger.getDriver().execute(txn -> {
            createIndex(txn, Constants.PERSON_TABLE_NAME, Constants.PERSON_GOV_ID_INDEX_NAME);
            createIndex(txn, Constants.VEHICLE_TABLE_NAME, Constants.VIN_INDEX_NAME);
            createIndex(txn, Constants.DRIVERS_LICENSE_TABLE_NAME, Constants.DRIVER_LICENSE_NUMBER_INDEX_NAME);
            createIndex(txn, Constants.DRIVERS_LICENSE_TABLE_NAME, Constants.DRIVER_LICENSE_PERSONID_INDEX_NAME);
            createIndex(txn, Constants.VEHICLE_REGISTRATION_TABLE_NAME, Constants.VIN_INDEX_NAME);
            createIndex(txn, Constants.VEHICLE_REGISTRATION_TABLE_NAME,
                    Constants.VEHICLE_REGISTRATION_LICENSE_PLATE_NUMBER_INDEX_NAME);
        });
        log.info("Indexes created successfully!");
    }
}

1.x


/*
 * Copyright 2020 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 org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import software.amazon.qldb.Result;
import software.amazon.qldb.TransactionExecutor;
import software.amazon.qldb.tutorial.model.SampleData;

/**
 * Create indexes on tables in a particular ledger.
 *
 * 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 CreateIndex {
    public static final Logger log = LoggerFactory.getLogger(CreateIndex.class);

    private CreateIndex() { }

    /**
     * In this example, create indexes for registrations and vehicles tables.
     *
     * @param txn
     *              The {@link TransactionExecutor} for lambda execute.
     * @param tableName
     *              Name of the table to be created.
     * @param indexAttribute
     *              The index attribute to use.
     * @return the number of tables created.
     */
    public static int createIndex(final TransactionExecutor txn, final String tableName, final String indexAttribute) {
        log.info("Creating an index on {}...", indexAttribute);
        final String createIndex = String.format("CREATE INDEX ON %s (%s)", tableName, indexAttribute);
        final Result r = txn.execute(createIndex);
        return SampleData.toIonValues(r).size();
    }

    public static void main(final String... args) {
        ConnectToLedger.getDriver().execute(txn -> {
            createIndex(txn, Constants.PERSON_TABLE_NAME, Constants.PERSON_GOV_ID_INDEX_NAME);
            createIndex(txn, Constants.VEHICLE_TABLE_NAME, Constants.VIN_INDEX_NAME);
            createIndex(txn, Constants.DRIVERS_LICENSE_TABLE_NAME, Constants.DRIVER_LICENSE_NUMBER_INDEX_NAME);
            createIndex(txn, Constants.DRIVERS_LICENSE_TABLE_NAME, Constants.DRIVER_LICENSE_PERSONID_INDEX_NAME);
            createIndex(txn, Constants.VEHICLE_REGISTRATION_TABLE_NAME, Constants.VIN_INDEX_NAME);
            createIndex(txn, Constants.VEHICLE_REGISTRATION_TABLE_NAME,
                    Constants.VEHICLE_REGISTRATION_LICENSE_PLATE_NUMBER_INDEX_NAME);
        }, (retryAttempt) -> log.info("Retrying due to OCC conflict..."));
        log.info("Indexes created successfully!");
    }
}

编译并运行以下程序 (InsertDocument.java)，将示例数据插入表内。

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.util.ArrayList;
import java.util.Collections;
import java.util.List;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.amazon.ion.IonValue;

import software.amazon.qldb.TransactionExecutor;
import software.amazon.qldb.tutorial.model.DriversLicense;
import software.amazon.qldb.tutorial.model.SampleData;
import software.amazon.qldb.tutorial.model.VehicleRegistration;

/**
 * Insert documents into a table in a QLDB ledger.
 *
 * 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 InsertDocument {
    public static final Logger log = LoggerFactory.getLogger(InsertDocument.class);

    private InsertDocument() { }

    /**
     * Insert the given list of documents into the specified table and return the document IDs of the inserted documents.
     *
     * @param txn
     *              The {@link TransactionExecutor} for lambda execute.
     * @param tableName
     *              Name of the table to insert documents into.
     * @param documents
     *              List of documents to insert into the specified table.
     * @return a list of document IDs.
     * @throws IllegalStateException if failed to convert documents into an {@link IonValue}.
     */
    public static List<String> insertDocuments(final TransactionExecutor txn, final String tableName,
                                               final List documents) {
        log.info("Inserting some documents in the {} table...", tableName);
        try {
            final String query = String.format("INSERT INTO %s ?", tableName);
            final IonValue ionDocuments = Constants.MAPPER.writeValueAsIonValue(documents);

            return SampleData.getDocumentIdsFromDmlResult(txn.execute(query, ionDocuments));
        } catch (IOException ioe) {
            throw new IllegalStateException(ioe);
        }
    }

    /**
     * Update PersonIds in driver's licenses and in vehicle registrations using document IDs.
     *
     * @param documentIds
     *              List of document IDs representing the PersonIds in DriversLicense and PrimaryOwners in VehicleRegistration.
     * @param licenses
     *              List of driver's licenses to update.
     * @param registrations
     *              List of registrations to update.
     */
    public static void updatePersonId(final List<String> documentIds, final List<DriversLicense> licenses,
                                      final List<VehicleRegistration> registrations) {
        for (int i = 0; i < documentIds.size(); ++i) {
            DriversLicense license = SampleData.LICENSES.get(i);
            VehicleRegistration registration = SampleData.REGISTRATIONS.get(i);
            licenses.add(SampleData.updatePersonIdDriversLicense(license, documentIds.get(i)));
            registrations.add(SampleData.updateOwnerVehicleRegistration(registration, documentIds.get(i)));
        }
    }

    public static void main(final String... args) {
        final List<DriversLicense> newDriversLicenses = new ArrayList<>();
        final List<VehicleRegistration> newVehicleRegistrations = new ArrayList<>();
        ConnectToLedger.getDriver().execute(txn -> {
            List<String> documentIds = insertDocuments(txn, Constants.PERSON_TABLE_NAME, SampleData.PEOPLE);
            updatePersonId(documentIds, newDriversLicenses, newVehicleRegistrations);
            insertDocuments(txn, Constants.VEHICLE_TABLE_NAME, SampleData.VEHICLES);
            insertDocuments(txn, Constants.VEHICLE_REGISTRATION_TABLE_NAME,
                    Collections.unmodifiableList(newVehicleRegistrations));
            insertDocuments(txn, Constants.DRIVERS_LICENSE_TABLE_NAME,
                    Collections.unmodifiableList(newDriversLicenses));
        });
        log.info("Documents inserted successfully!");
    }
}

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.TransactionExecutor;
import software.amazon.qldb.tutorial.model.DriversLicense;
import software.amazon.qldb.tutorial.model.SampleData;
import software.amazon.qldb.tutorial.model.VehicleRegistration;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

/**
 * Insert documents into a table in a QLDB ledger.
 *
 * 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 InsertDocument {
    public static final Logger log = LoggerFactory.getLogger(InsertDocument.class);

    private InsertDocument() { }

    /**
     * Insert the given list of documents into the specified table and return the document IDs of the inserted documents.
     *
     * @param txn
     *              The {@link TransactionExecutor} for lambda execute.
     * @param tableName
     *              Name of the table to insert documents into.
     * @param documents
     *              List of documents to insert into the specified table.
     * @return a list of document IDs.
     * @throws IllegalStateException if failed to convert documents into an {@link IonValue}.
     */
    public static List<String> insertDocuments(final TransactionExecutor txn, final String tableName,
                                               final List documents) {
        log.info("Inserting some documents in the {} table...", tableName);
        try {
            final String statement = String.format("INSERT INTO %s ?", tableName);
            final IonValue ionDocuments = Constants.MAPPER.writeValueAsIonValue(documents);
            final List<IonValue> parameters = Collections.singletonList(ionDocuments);
            return SampleData.getDocumentIdsFromDmlResult(txn.execute(statement, parameters));
        } catch (IOException ioe) {
            throw new IllegalStateException(ioe);
        }
    }

    /**
     * Update PersonIds in driver's licenses and in vehicle registrations using document IDs.
     *
     * @param documentIds
     *              List of document IDs representing the PersonIds in DriversLicense and PrimaryOwners in VehicleRegistration.
     * @param licenses
     *              List of driver's licenses to update.
     * @param registrations
     *              List of registrations to update.
     */
    public static void updatePersonId(final List<String> documentIds, final List<DriversLicense> licenses,
                                      final List<VehicleRegistration> registrations) {
        for (int i = 0; i < documentIds.size(); ++i) {
            DriversLicense license = SampleData.LICENSES.get(i);
            VehicleRegistration registration = SampleData.REGISTRATIONS.get(i);
            licenses.add(SampleData.updatePersonIdDriversLicense(license, documentIds.get(i)));
            registrations.add(SampleData.updateOwnerVehicleRegistration(registration, documentIds.get(i)));
        }
    }

    public static void main(final String... args) {
        final List<DriversLicense> newDriversLicenses = new ArrayList<>();
        final List<VehicleRegistration> newVehicleRegistrations = new ArrayList<>();
        ConnectToLedger.getDriver().execute(txn -> {
            List<String> documentIds = insertDocuments(txn, Constants.PERSON_TABLE_NAME, SampleData.PEOPLE);
            updatePersonId(documentIds, newDriversLicenses, newVehicleRegistrations);
            insertDocuments(txn, Constants.VEHICLE_TABLE_NAME, SampleData.VEHICLES);
            insertDocuments(txn, Constants.VEHICLE_REGISTRATION_TABLE_NAME,
                    Collections.unmodifiableList(newVehicleRegistrations));
            insertDocuments(txn, Constants.DRIVERS_LICENSE_TABLE_NAME,
                    Collections.unmodifiableList(newDriversLicenses));
        }, (retryAttempt) -> log.info("Retrying due to OCC conflict..."));
        log.info("Documents inserted successfully!");
    }
}

注意

该程序演示如何使用参数化值调用execute方法。除了要运行的 PartiQL 语句之外，您还可以传递IonValue类数据参数。在语句字符串中将问号 (?) 作为变量占位符。
如果 INSERT 语句成功，则返回每个插入文档的id。

接下来，您可以使用 SELECT 语句从 vehicle-registration 分类账中的表中读取数据。继续执行步骤 4：查询分类账中的表。

Javascript 在您的浏览器中被禁用或不可用。

要使用 Amazon Web Services 文档，必须启用 Javascript。请参阅浏览器的帮助页面以了解相关说明。

文档惯例

步骤 2：测试连接性

步骤 4：查询表格