DynamoDB简介

DynamoDB是Amazon提供的一种完全托管的 NoSQL 数据库服务，数据库的软硬件的管理和维护都由Amazon负责，相比传统数据库，免除了用户操作和扩展分布式数据库的管理工作负担，因而无需担心硬件预置、设置和配置、复制、软件修补或集群扩展等问题。DynamoDB具有以下特性：

高性能，可预测的性能，能够实现无缝扩展：自动将表的数据和流量分布到足够多的服务器，以满足吞吐量和存储需求，同时保持一致、快速的性能
高可用性：自动将数据在同一个地区（Region）的不同可用区（Availability Zone）进行复制
支持数据加密
备份功能：支持按需备份和按时间点备份
支持数据过期自动删除（TTL）
支持存储和检索任意量级的数据，并支持任何级别的请求流量

DynamoDB表的创建

DynamoDB表的创建有以下几种方式：

AWS Cloud Formation
AWS Command Line Interface
AWS SDK
AWS Console

实际开发过程中，开发环境,测试环境和生产环境都是使用AWS Cloud Formation进行自动化部署，在开发环境会用到AWS Command Line Interface或者AWS Console进行表的创建，几乎没有使用过AWS SDK进行表的创建。AWS SDK主要应用为数据库的CRUD操作。

DynamoDB表的属性

TableName：必要，表的名字在同一个地区（Region）内唯一
AttributeDefinitions：必要，只需包含表和索引的分区键（Partition/Hash?Key）和排序键（RangeKey）属性,其他属性无需在此定义
- AttributeName：属性名，值为长度在1~255之间的字符串
- AttributeType：属性类型，可取值为：
  - S?- 字符串(String)类型
  - N?- 数字（Number）类型
  - B?- 复杂（Binary）类型
KeySchema：必要，指定表的分区键（Partition/Hash?Key）和排序键（RangeKey）
- AttributeName：键的名称，必须在AttributeDefinitions中定义过
- KeyType：键的类型，可取值为：
  - HASH?- 分区键
  - RANGE?- 排序键
GlobalSecondaryIndexes：非必要，全局索引列表，表创建之后可以添加，最多可创建20个
- IndexName: 索引名称
- KeySchema: 索引的分区键（Partition/Hash?Key）和排序键（RangeKey）
- Projection:指定哪些属性需要从表中复制到索引中
  - ProjectionType：类型，可取值为
    - KEYS_ONLY?- 只包含表和索引的分区键（Partition/Hash?Key）和排序键（RangeKey）
    - INCLUDE?- 除了包含表和索引的分区键（Partition/Hash?Key）和排序键（RangeKey）之外，还包含NonKeyAttributes指定的非键属性
    - ALL?- 所有表属性
  - NonKeyAttributes:?ProjectionType为INCLUDE?时用于指定的非键属性，最多包含20个属性
- ProvisionedThroughput:指定ReadCapacityUnits和WriteCapacityUnits?
  - ReadCapacityUnits: 数字，按需设置
  - WriteCapacityUnits:?数字，按需设置
- ContributorInsightsSpecification：是否启用CloudWatch Contributor Insights?
  - Enabled： true/false
LocalSecondaryIndexes：非必要，局部索引列表，表创建之后不可添加，所以在创建表的时候要考虑好是否需要
- IndexName: 索引名称
- KeySchema: 索引的分区键（Partition/Hash?Key）和排序键（RangeKey）
- Projection:指定哪些属性需要从表中复制到索引中
  - ProjectionType：类型，可取值为
    - KEYS_ONLY?- 只包含表和索引的分区键（Partition/Hash?Key）和排序键（RangeKey）
    - INCLUDE?- 除了包含表和索引的分区键（Partition/Hash?Key）和排序键（RangeKey）之外，还包含NonKeyAttributes指定的非键属性
    - ALL?- 所有表属性
  - NonKeyAttributes:?ProjectionType为INCLUDE?时用于指定的非键属性，最多包含20个属性
TimeToLiveSpecification：非必要，设置是否开启TTL功能，并指定TTL属性
- AttributeName：TTL属性名称
- Enabled：true/false
BillingMode：计费方式，可取值为：
- PROVISIONED?- 预留方式，设置为此方式时必须同时设置ProvisionedThroughput，适用于可预测负载的情况
- PAY_PER_REQUEST?- 按需计费，适用于不可预测负载的情况
ProvisionedThroughput:指定ReadCapacityUnits和WriteCapacityUnits，BillingMode为?PROVISIONED时必须设置
- ReadCapacityUnits: 数字，按需设置，
- WriteCapacityUnits:?数字，按需设置
PointInTimeRecoverySpecification：是否开启按时间点备份
- PointInTimeRecoveryEnabled: true/false
SSESpecification：是否开启服务端加密
- KMSMasterKeyId:加密秘钥id
- SSEEnabled:: true/false
- SSEType: 加密类型，可取值为：KMS?
KinesisStreamSpecification:指定Kinesis data stream的ARN
- StreamArn: String
StreamSpecification：指定数据修改时有哪些信息需要写入stream
- StreamViewType: 可取值为：???????
  - KEYS_ONLY?- 只写入键属性
  - NEW_IMAGE?- 写入修改后的整条数据
  - OLD_IMAGE?- 写入修改前的整条数据
  - NEW_AND_OLD_IMAGES?- 修改前后的数据都写入
???????ContributorInsightsSpecification：是否启用CloudWatch Contributor Insights?
- Enabled： true/false
Tags：tag的列表
- ??????????????Key: String
- Value: String

使用AWS Cloud Formation创建表

service: jessica-dto
                 
provider:
  name: aws
  stage: develop
  region: ap-southeast-1
  stackName: ${self:provider.stage}-${self:service}

resources:
  Resources:
    TestTable:
      Type: AWS::DynamoDB::Table
      Properties:
        TableName: ${self:provider.stage}.TestTableCloudFormation
        AttributeDefinitions:
          - AttributeName: pk
            AttributeType: S
          - AttributeName: sk
            AttributeType: S
          - AttributeName: gsiOnePk
            AttributeType: S
          - AttributeName: gsiOneSk
            AttributeType: S
          - AttributeName: gsiTwoPk
            AttributeType: S
          - AttributeName: gsiTwoSk
            AttributeType: S
          - AttributeName: lsiOneSk
            AttributeType: S
          - AttributeName: lsiTwoSk
            AttributeType: S
        KeySchema:
          - AttributeName: pk
            KeyType: HASH
          - AttributeName: sk
            KeyType: RANGE
        ProvisionedThroughput:
          ReadCapacityUnits: 1
          WriteCapacityUnits: 1
        BillingMode: PROVISIONED
        LocalSecondaryIndexes:
          - IndexName: test.lsiOne
            KeySchema:
              - AttributeName: pk
                KeyType: HASH
              - AttributeName: lsiOneSk
                KeyType: RANGE
            Projection:
              ProjectionType: ALL
          - IndexName: test.lsiTwo
            KeySchema:
              - AttributeName: pk
                KeyType: HASH
              - AttributeName: lsiTwoSk
                KeyType: RANGE
            Projection:
              ProjectionType: ALL
        GlobalSecondaryIndexes:
          - IndexName: test.gsiOne
            KeySchema:
              - AttributeName: gsiOnePk
                KeyType: HASH
              - AttributeName: gsiOneSk
                KeyType: RANGE
            Projection:
              ProjectionType: KEYS_ONLY
            ProvisionedThroughput:
              ReadCapacityUnits: 1
              WriteCapacityUnits: 1
          - IndexName: test.gsiTwo
            KeySchema:
              - AttributeName: gsiTwoPk
                KeyType: HASH
              - AttributeName: gsiTwoSk
                KeyType: RANGE
            Projection:
              ProjectionType: KEYS_ONLY
            ProvisionedThroughput:
              ReadCapacityUnits: 1
              WriteCapacityUnits: 1
        TimeToLiveSpecification: 
          AttributeName: ttl
          Enabled: true
        PointInTimeRecoverySpecification:
          PointInTimeRecoveryEnabled: true
        SSESpecification:
          SSEEnabled: false
        ContributorInsightsSpecification:
          Enabled: true
        Tags:
          - Key: product
            Value: ${self:service}

使用sls deploy命令进行部署.

使用AWS Command Line Interface 创建表

执行命令aws dynamodb create-table?包含如下参数:

create-table
--attribute-definitions <value>
--table-name <value>
--key-schema <value>
[--local-secondary-indexes <value>]
[--global-secondary-indexes <value>]
[--billing-mode <value>]
[--provisioned-throughput <value>]
[--stream-specification <value>]
[--sse-specification <value>]
[--tags <value>]
[--cli-input-json <value>]
[--generate-cli-skeleton <value>]

aws cli不支持在创建表的同时设置TimeToLiveSpecification, PointInTimeRecoverySpecification, ContributorInsightsSpecification,只能在表创建之后通过更新来进行设置.

aws dynamodb create-table \
    --table-name develop.TestTableCli \
    --attribute-definitions \
        AttributeName=pk,AttributeType=S \
        AttributeName=sk,AttributeType=S \
        AttributeName=gsiPk,AttributeType=S \
        AttributeName=gsiSk,AttributeType=S \
        AttributeName=gsiTwoPk,AttributeType=S \
        AttributeName=gsiTwoSk,AttributeType=S \
        AttributeName=lsiOneSk,AttributeType=S \
        AttributeName=lsiTwoSk,AttributeType=S \
    --key-schema \
        AttributeName=pk,KeyType=HASH \
        AttributeName=sk,KeyType=RANGE \
    --billing-mode \
        PROVISIONED \
    --provisioned-throughput \
        "{
            \"ReadCapacityUnits\": 5,
            \"WriteCapacityUnits\": 5
        }" \
    --local-secondary-indexes \
        "[
            {
                \"IndexName\": \"test.lsiOne\",
                \"KeySchema\": [{\"AttributeName\":\"pk\",\"KeyType\":\"HASH\"},
                                {\"AttributeName\":\"lsiOneSk\",\"KeyType\":\"RANGE\"}],
                \"Projection\":{
                    \"ProjectionType\":\"ALL\"
                }
            },
            {
                \"IndexName\": \"test.lsiTwo\",
                \"KeySchema\": [{\"AttributeName\":\"pk\",\"KeyType\":\"HASH\"},
                                {\"AttributeName\":\"lsiTwoSk\",\"KeyType\":\"RANGE\"}],
                \"Projection\":{
                    \"ProjectionType\":\"ALL\"
                }
            }
        ]" \
    --global-secondary-indexes \
        "[
            {
                \"IndexName\": \"test.gsi\",
                \"KeySchema\": [{\"AttributeName\":\"gsiPk\",\"KeyType\":\"HASH\"},
                                {\"AttributeName\":\"gsiSk\",\"KeyType\":\"RANGE\"}],
                \"Projection\":{
                    \"ProjectionType\":\"ALL\"
                },
                \"ProvisionedThroughput\": {
                    \"ReadCapacityUnits\": 5,
                    \"WriteCapacityUnits\": 5
                }
            },
            {
                \"IndexName\": \"test.gsiTwo\",
                \"KeySchema\": [{\"AttributeName\":\"gsiTwoPk\",\"KeyType\":\"HASH\"},
                                {\"AttributeName\":\"gsiTwoSk\",\"KeyType\":\"RANGE\"}],
                \"Projection\":{
                    \"ProjectionType\":\"ALL\"
                },
                \"ProvisionedThroughput\": {
                    \"ReadCapacityUnits\": 5,
                    \"WriteCapacityUnits\": 5
                }
            }
        ]" \
    --sse-specification \
        Enabled=false \
    --tags \
        "[
            {
                \"Key\": \"product\",
                \"Value\": \"social\"
            },
            {
                \"Key\": \"Name\",
                \"Value\": \"test.develop\"
            }  
        ]"

设置TimeToLiveSpecification

aws dynamodb update-time-to-live \
    --table-name \
        develop.TestTableCli \
    --time-to-live-specification \
        Enabled=true,AttributeName=ttl

设置PointInTimeRecoverySpecification

aws dynamodb update-continuous-backups \
    --table-name \
        develop.TestTableCli \
    --point-in-time-recovery-specification \
        PointInTimeRecoveryEnabled=true

设置ContributorInsightsSpecification

aws dynamodb update-contributor-insights \
    --table-name \
        develop.TestTableCli \
    --contributor-insights-action ENABLE

使用AWS Java SDK 创建表

aws dynanodb java sdk不支持在创建表的同时设置TimeToLiveSpecification, PointInTimeRecoverySpecification, ContributorInsightsSpecification,只能在表创建之后通过更新来进行设置.

package com.jessica.dynamodb.table.create;

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

import com.amazonaws.services.dynamodbv2.AmazonDynamoDB;
import com.amazonaws.services.dynamodbv2.AmazonDynamoDBClientBuilder;
import com.amazonaws.services.dynamodbv2.document.DynamoDB;
import com.amazonaws.services.dynamodbv2.document.Table;
import com.amazonaws.services.dynamodbv2.model.AttributeDefinition;
import com.amazonaws.services.dynamodbv2.model.BillingMode;
import com.amazonaws.services.dynamodbv2.model.ContributorInsightsAction;
import com.amazonaws.services.dynamodbv2.model.CreateTableRequest;
import com.amazonaws.services.dynamodbv2.model.GlobalSecondaryIndex;
import com.amazonaws.services.dynamodbv2.model.KeySchemaElement;
import com.amazonaws.services.dynamodbv2.model.KeyType;
import com.amazonaws.services.dynamodbv2.model.LocalSecondaryIndex;
import com.amazonaws.services.dynamodbv2.model.PointInTimeRecoverySpecification;
import com.amazonaws.services.dynamodbv2.model.Projection;
import com.amazonaws.services.dynamodbv2.model.ProjectionType;
import com.amazonaws.services.dynamodbv2.model.ProvisionedThroughput;
import com.amazonaws.services.dynamodbv2.model.SSESpecification;
import com.amazonaws.services.dynamodbv2.model.Tag;
import com.amazonaws.services.dynamodbv2.model.TimeToLiveSpecification;
import com.amazonaws.services.dynamodbv2.model.UpdateContinuousBackupsRequest;
import com.amazonaws.services.dynamodbv2.model.UpdateContributorInsightsRequest;
import com.amazonaws.services.dynamodbv2.model.UpdateTimeToLiveRequest;
import com.jessica.dynamodb.constant.DynamoDBConstant;

public class CreateTable {
	static AmazonDynamoDB dynamoDBClient = AmazonDynamoDBClientBuilder.standard().build();

	static String tableName = "develop.TestTableJava";
	
	static DynamoDB dynamoDB = new DynamoDB(dynamoDBClient);

	public static void main(String[] args) throws Exception {
		createTable();
		updateTableTTL();
		updateTableBackeUpPolicy();
		updateTableContributorInsights();
	}

	static void createTable() {
		try {
			// attributes
			List<AttributeDefinition> attributeDefinitions = new ArrayList<AttributeDefinition>();
			attributeDefinitions
					.add(new AttributeDefinition().withAttributeName(DynamoDBConstant.HASH_KEY).withAttributeType("S"));
			attributeDefinitions.add(
					new AttributeDefinition().withAttributeName(DynamoDBConstant.RANGE_KEY).withAttributeType("S"));
			attributeDefinitions.add(new AttributeDefinition().withAttributeName(DynamoDBConstant.GSI_ONE_HASH_KEY)
					.withAttributeType("S"));
			attributeDefinitions.add(new AttributeDefinition().withAttributeName(DynamoDBConstant.GSI_ONE_RANGE_KEY)
					.withAttributeType("S"));
			attributeDefinitions.add(new AttributeDefinition().withAttributeName(DynamoDBConstant.GSI_TWO_HASH_KEY)
					.withAttributeType("S"));
			attributeDefinitions.add(new AttributeDefinition().withAttributeName(DynamoDBConstant.GSI_TWO_RANGE_KEY)
					.withAttributeType("S"));
			attributeDefinitions.add(new AttributeDefinition().withAttributeName(DynamoDBConstant.LSI_ONE_RANGE_KEY)
					.withAttributeType("S"));
			attributeDefinitions.add(new AttributeDefinition().withAttributeName(DynamoDBConstant.LSI_TWO_RANGE_KEY)
					.withAttributeType("S"));

			// table key schema
			List<KeySchemaElement> keySchema = new ArrayList<KeySchemaElement>();
			keySchema
					.add(new KeySchemaElement().withAttributeName(DynamoDBConstant.HASH_KEY).withKeyType(KeyType.HASH)); // partition
																															// key
			keySchema.add(
					new KeySchemaElement().withAttributeName(DynamoDBConstant.RANGE_KEY).withKeyType(KeyType.RANGE)); // range
																														// key

			// provisioned Throughput
			ProvisionedThroughput provisionedThroughput = new ProvisionedThroughput().withReadCapacityUnits(1L)
					.withWriteCapacityUnits(1L);

			// local secondary index
			List<LocalSecondaryIndex> localSecondaryIndexs = new ArrayList<>();
			List<KeySchemaElement> lsiOneKeySchema = new ArrayList<KeySchemaElement>();
			lsiOneKeySchema.add(new KeySchemaElement().withAttributeName(DynamoDBConstant.HASH_KEY)
					.withKeyType(KeyType.HASH));
			lsiOneKeySchema.add(new KeySchemaElement().withAttributeName(DynamoDBConstant.LSI_ONE_RANGE_KEY)
					.withKeyType(KeyType.RANGE));
			List<KeySchemaElement> lsiTwoKeySchema = new ArrayList<KeySchemaElement>();
			lsiTwoKeySchema.add(new KeySchemaElement().withAttributeName(DynamoDBConstant.HASH_KEY)
					.withKeyType(KeyType.HASH));
			lsiTwoKeySchema.add(new KeySchemaElement().withAttributeName(DynamoDBConstant.LSI_TWO_RANGE_KEY)
					.withKeyType(KeyType.RANGE));
			localSecondaryIndexs.add(new LocalSecondaryIndex().withIndexName(DynamoDBConstant.LSI_ONE_NAME)
					.withKeySchema(lsiOneKeySchema)
					.withProjection(new Projection().withProjectionType(ProjectionType.KEYS_ONLY)));
			localSecondaryIndexs.add(new LocalSecondaryIndex().withIndexName(DynamoDBConstant.LSI_TWO_NAME)
					.withKeySchema(lsiTwoKeySchema)
					.withProjection(new Projection().withProjectionType(ProjectionType.KEYS_ONLY)));

			// global secondary index
			List<GlobalSecondaryIndex> globalSecondaryIndexs = new ArrayList<>();
			List<KeySchemaElement> gsiOneKeySchema = new ArrayList<KeySchemaElement>();
			gsiOneKeySchema.add(new KeySchemaElement().withAttributeName(DynamoDBConstant.GSI_ONE_HASH_KEY)
					.withKeyType(KeyType.HASH));
			gsiOneKeySchema.add(new KeySchemaElement().withAttributeName(DynamoDBConstant.GSI_ONE_RANGE_KEY)
					.withKeyType(KeyType.RANGE)); 
			List<KeySchemaElement> gsiTwoKeySchema = new ArrayList<KeySchemaElement>();
			gsiTwoKeySchema.add(new KeySchemaElement().withAttributeName(DynamoDBConstant.GSI_TWO_HASH_KEY)
					.withKeyType(KeyType.HASH)); 
			gsiTwoKeySchema.add(new KeySchemaElement().withAttributeName(DynamoDBConstant.GSI_TWO_RANGE_KEY)
					.withKeyType(KeyType.RANGE)); 
			globalSecondaryIndexs.add(new GlobalSecondaryIndex().withIndexName(DynamoDBConstant.GSI_ONE_NAME)
					.withKeySchema(gsiOneKeySchema)
					.withProjection(new Projection().withProjectionType(ProjectionType.KEYS_ONLY))
					.withProvisionedThroughput(provisionedThroughput));
			globalSecondaryIndexs.add(new GlobalSecondaryIndex().withIndexName(DynamoDBConstant.GSI_TWO_NAME)
					.withKeySchema(gsiTwoKeySchema)
					.withProjection(new Projection().withProjectionType(ProjectionType.KEYS_ONLY))
					.withProvisionedThroughput(provisionedThroughput));

			SSESpecification sseSpecification = new SSESpecification().withEnabled(false);

			Tag tag = new Tag().withKey("product").withValue("create-table");

			CreateTableRequest request = new CreateTableRequest()
					.withTableName(tableName)
					.withAttributeDefinitions(attributeDefinitions)
					.withKeySchema(keySchema)
					.withBillingMode(BillingMode.PROVISIONED)
					.withProvisionedThroughput(provisionedThroughput)
					.withLocalSecondaryIndexes(localSecondaryIndexs)
					.withGlobalSecondaryIndexes(globalSecondaryIndexs)
					.withSSESpecification(sseSpecification)
					.withTags(tag);

			System.out.println("Issuing CreateTable request for " + tableName);
			Table table = dynamoDB.createTable(request);
            System.out.println("Waiting for " + tableName + " to be created...this may take a while...");
            table.waitForActive();
            System.out.println("Create " + tableName + " success");	
		} catch (Exception e) {
			System.err.println("CreateTable request failed for " + tableName);
			System.err.println(e.getMessage());
		}

	}

	static void updateTableTTL() {
		TimeToLiveSpecification timeToLiveSpecification = new TimeToLiveSpecification().withAttributeName("ttl")
				.withEnabled(true);

		UpdateTimeToLiveRequest updateTimeToLiveRequest = new UpdateTimeToLiveRequest().withTableName(tableName)
				.withTimeToLiveSpecification(timeToLiveSpecification);
		System.out.println("Update time to live for " + tableName);
		try {
			dynamoDBClient.updateTimeToLive(updateTimeToLiveRequest);
			System.out.println("Waiting for " + tableName + " to update TimeToLive");
			dynamoDB.getTable(tableName).waitForActive();
			System.out.println("Update " + tableName + " TimeToLive success");	
		} catch (Exception e) {
			System.err.println("Update time to live request failed for " + tableName);
			System.err.println(e.getMessage());
		}
	}

	static void updateTableBackeUpPolicy() {
		PointInTimeRecoverySpecification pointInTimeRecoverySpecification = new PointInTimeRecoverySpecification()
				.withPointInTimeRecoveryEnabled(true);
		UpdateContinuousBackupsRequest updateContinuousBackupsRequest = new UpdateContinuousBackupsRequest()
				.withTableName(tableName).withPointInTimeRecoverySpecification(pointInTimeRecoverySpecification);
		try {
			System.out.println("Update table back up policy for " + tableName);
			dynamoDBClient.updateContinuousBackups(updateContinuousBackupsRequest);
			System.out.println("Waiting for " + tableName + " to update ContinuousBackups");
			dynamoDB.getTable(tableName).waitForActive();
			System.out.println("Update " + tableName + " ContinuousBackups success");	
		} catch (Exception e) {
			System.err.println("Update table back up policy failed for " + tableName);
			System.err.println(e.getMessage());
		}
	}

	static void updateTableContributorInsights() {
		UpdateContributorInsightsRequest updateContributorInsightsRequest = new UpdateContributorInsightsRequest()
				.withTableName(tableName).withContributorInsightsAction(ContributorInsightsAction.ENABLE);
		try {
			System.out.println("Update table contributor insights for " + tableName);
			dynamoDBClient.updateContributorInsights(updateContributorInsightsRequest);
			System.out.println("Waiting for " + tableName + " to update ContributorInsights");
			dynamoDB.getTable(tableName).waitForActive();
			System.out.println("Update " + tableName + " ContributorInsights success");	
		} catch (Exception e) {
			System.err.println("Update table contributor insights failed for " + tableName);
			System.err.println(e.getMessage());
		}
	}

}