Amazon DynamoDB
开发人员指南 (API Version 2012-08-10)
AWS 服务或AWS文档中描述的功能,可能因地区/位置而异。点 击 Getting Started with Amazon AWS to see specific differences applicable to the China (Beijing) Region.

示例:使用 AWS SDK for Java 文档 API 创建、更新、删除和列出表

下面的代码示例使用AWS SDK for Java文档 API 创建、更新和删除表 (ExampleTable)。表在更新的同时还会增加预置的吞吐量值。同时,该示例还列出您账户中所有的表,并获得特定表的描述。有关运行以下示例的分步说明,请参阅 Java 代码示例

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// Copyright 2012-2015 Amazon.com, Inc. or its affiliates. All Rights Reserved. // Licensed under the Apache License, Version 2.0. package com.amazonaws.codesamples.document; import java.util.ArrayList; import java.util.Iterator; 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.document.TableCollection; import com.amazonaws.services.dynamodbv2.model.AttributeDefinition; import com.amazonaws.services.dynamodbv2.model.CreateTableRequest; import com.amazonaws.services.dynamodbv2.model.KeySchemaElement; import com.amazonaws.services.dynamodbv2.model.KeyType; import com.amazonaws.services.dynamodbv2.model.ListTablesResult; import com.amazonaws.services.dynamodbv2.model.ProvisionedThroughput; import com.amazonaws.services.dynamodbv2.model.TableDescription; public class DocumentAPITableExample { static AmazonDynamoDB client = AmazonDynamoDBClientBuilder.standard().build(); static DynamoDB dynamoDB = new DynamoDB(client); static String tableName = "ExampleTable"; public static void main(String[] args) throws Exception { createExampleTable(); listMyTables(); getTableInformation(); updateExampleTable(); deleteExampleTable(); } static void createExampleTable() { try { List<AttributeDefinition> attributeDefinitions = new ArrayList<AttributeDefinition>(); attributeDefinitions.add(new AttributeDefinition().withAttributeName("Id").withAttributeType("N")); List<KeySchemaElement> keySchema = new ArrayList<KeySchemaElement>(); keySchema.add(new KeySchemaElement().withAttributeName("Id").withKeyType(KeyType.HASH)); // Partition // key CreateTableRequest request = new CreateTableRequest().withTableName(tableName).withKeySchema(keySchema) .withAttributeDefinitions(attributeDefinitions).withProvisionedThroughput( new ProvisionedThroughput().withReadCapacityUnits(5L).withWriteCapacityUnits(6L)); 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(); getTableInformation(); } catch (Exception e) { System.err.println("CreateTable request failed for " + tableName); System.err.println(e.getMessage()); } } static void listMyTables() { TableCollection<ListTablesResult> tables = dynamoDB.listTables(); Iterator<Table> iterator = tables.iterator(); System.out.println("Listing table names"); while (iterator.hasNext()) { Table table = iterator.next(); System.out.println(table.getTableName()); } } static void getTableInformation() { System.out.println("Describing " + tableName); TableDescription tableDescription = dynamoDB.getTable(tableName).describe(); System.out.format( "Name: %s:\n" + "Status: %s \n" + "Provisioned Throughput (read capacity units/sec): %d \n" + "Provisioned Throughput (write capacity units/sec): %d \n", tableDescription.getTableName(), tableDescription.getTableStatus(), tableDescription.getProvisionedThroughput().getReadCapacityUnits(), tableDescription.getProvisionedThroughput().getWriteCapacityUnits()); } static void updateExampleTable() { Table table = dynamoDB.getTable(tableName); System.out.println("Modifying provisioned throughput for " + tableName); try { table.updateTable(new ProvisionedThroughput().withReadCapacityUnits(6L).withWriteCapacityUnits(7L)); table.waitForActive(); } catch (Exception e) { System.err.println("UpdateTable request failed for " + tableName); System.err.println(e.getMessage()); } } static void deleteExampleTable() { Table table = dynamoDB.getTable(tableName); try { System.out.println("Issuing DeleteTable request for " + tableName); table.delete(); System.out.println("Waiting for " + tableName + " to be deleted...this may take a while..."); table.waitForDelete(); } catch (Exception e) { System.err.println("DeleteTable request failed for " + tableName); System.err.println(e.getMessage()); } } }