Amazon DynamoDB
开发人员指南 (API Version 2012-08-10)
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使用适用于 Java 的 AWS 开发工具包创建示例表和上传数据

以下 Java 代码示例用于创建表和向表中上传数据。所产生的表结构和数据显示在 创建表并加载示例数据 中。有关使用 Eclipse 运行此代码的分步说明,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; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Arrays; import java.util.Date; import java.util.HashSet; import java.util.TimeZone; 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.Item; import com.amazonaws.services.dynamodbv2.document.Table; 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.LocalSecondaryIndex; import com.amazonaws.services.dynamodbv2.model.Projection; import com.amazonaws.services.dynamodbv2.model.ProjectionType; import com.amazonaws.services.dynamodbv2.model.ProvisionedThroughput; public class CreateTablesLoadData { static AmazonDynamoDB client = AmazonDynamoDBClientBuilder.standard().build(); static DynamoDB dynamoDB = new DynamoDB(client); static SimpleDateFormat dateFormatter = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'"); static String productCatalogTableName = "ProductCatalog"; static String forumTableName = "Forum"; static String threadTableName = "Thread"; static String replyTableName = "Reply"; public static void main(String[] args) throws Exception { try { deleteTable(productCatalogTableName); deleteTable(forumTableName); deleteTable(threadTableName); deleteTable(replyTableName); // Parameter1: table name // Parameter2: reads per second // Parameter3: writes per second // Parameter4/5: partition key and data type // Parameter6/7: sort key and data type (if applicable) createTable(productCatalogTableName, 10L, 5L, "Id", "N"); createTable(forumTableName, 10L, 5L, "Name", "S"); createTable(threadTableName, 10L, 5L, "ForumName", "S", "Subject", "S"); createTable(replyTableName, 10L, 5L, "Id", "S", "ReplyDateTime", "S"); loadSampleProducts(productCatalogTableName); loadSampleForums(forumTableName); loadSampleThreads(threadTableName); loadSampleReplies(replyTableName); } catch (Exception e) { System.err.println("Program failed:"); System.err.println(e.getMessage()); } System.out.println("Success."); } private static void deleteTable(String tableName) { 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()); } } private static void createTable(String tableName, long readCapacityUnits, long writeCapacityUnits, String partitionKeyName, String partitionKeyType) { createTable(tableName, readCapacityUnits, writeCapacityUnits, partitionKeyName, partitionKeyType, null, null); } private static void createTable(String tableName, long readCapacityUnits, long writeCapacityUnits, String partitionKeyName, String partitionKeyType, String sortKeyName, String sortKeyType) { try { ArrayList<KeySchemaElement> keySchema = new ArrayList<KeySchemaElement>(); keySchema.add(new KeySchemaElement().withAttributeName(partitionKeyName).withKeyType(KeyType.HASH)); // Partition // key ArrayList<AttributeDefinition> attributeDefinitions = new ArrayList<AttributeDefinition>(); attributeDefinitions .add(new AttributeDefinition().withAttributeName(partitionKeyName).withAttributeType(partitionKeyType)); if (sortKeyName != null) { keySchema.add(new KeySchemaElement().withAttributeName(sortKeyName).withKeyType(KeyType.RANGE)); // Sort // key attributeDefinitions .add(new AttributeDefinition().withAttributeName(sortKeyName).withAttributeType(sortKeyType)); } CreateTableRequest request = new CreateTableRequest().withTableName(tableName).withKeySchema(keySchema) .withProvisionedThroughput(new ProvisionedThroughput().withReadCapacityUnits(readCapacityUnits) .withWriteCapacityUnits(writeCapacityUnits)); // If this is the Reply table, define a local secondary index if (replyTableName.equals(tableName)) { attributeDefinitions .add(new AttributeDefinition().withAttributeName("PostedBy").withAttributeType("S")); ArrayList<LocalSecondaryIndex> localSecondaryIndexes = new ArrayList<LocalSecondaryIndex>(); localSecondaryIndexes.add(new LocalSecondaryIndex().withIndexName("PostedBy-Index") .withKeySchema(new KeySchemaElement().withAttributeName(partitionKeyName).withKeyType(KeyType.HASH), // Partition // key new KeySchemaElement().withAttributeName("PostedBy").withKeyType(KeyType.RANGE)) // Sort // key .withProjection(new Projection().withProjectionType(ProjectionType.KEYS_ONLY))); request.setLocalSecondaryIndexes(localSecondaryIndexes); } request.setAttributeDefinitions(attributeDefinitions); 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(); } catch (Exception e) { System.err.println("CreateTable request failed for " + tableName); System.err.println(e.getMessage()); } } private static void loadSampleProducts(String tableName) { Table table = dynamoDB.getTable(tableName); try { System.out.println("Adding data to " + tableName); Item item = new Item().withPrimaryKey("Id", 101).withString("Title", "Book 101 Title") .withString("ISBN", "111-1111111111") .withStringSet("Authors", new HashSet<String>(Arrays.asList("Author1"))).withNumber("Price", 2) .withString("Dimensions", "8.5 x 11.0 x 0.5").withNumber("PageCount", 500) .withBoolean("InPublication", true).withString("ProductCategory", "Book"); table.putItem(item); item = new Item().withPrimaryKey("Id", 102).withString("Title", "Book 102 Title") .withString("ISBN", "222-2222222222") .withStringSet("Authors", new HashSet<String>(Arrays.asList("Author1", "Author2"))) .withNumber("Price", 20).withString("Dimensions", "8.5 x 11.0 x 0.8").withNumber("PageCount", 600) .withBoolean("InPublication", true).withString("ProductCategory", "Book"); table.putItem(item); item = new Item().withPrimaryKey("Id", 103).withString("Title", "Book 103 Title") .withString("ISBN", "333-3333333333") .withStringSet("Authors", new HashSet<String>(Arrays.asList("Author1", "Author2"))) // Intentional. Later we'll run Scan to find price error. Find // items > 1000 in price. .withNumber("Price", 2000).withString("Dimensions", "8.5 x 11.0 x 1.5").withNumber("PageCount", 600) .withBoolean("InPublication", false).withString("ProductCategory", "Book"); table.putItem(item); // Add bikes. item = new Item().withPrimaryKey("Id", 201).withString("Title", "18-Bike-201") // Size, followed by some title. .withString("Description", "201 Description").withString("BicycleType", "Road") .withString("Brand", "Mountain A") // Trek, Specialized. .withNumber("Price", 100).withStringSet("Color", new HashSet<String>(Arrays.asList("Red", "Black"))) .withString("ProductCategory", "Bicycle"); table.putItem(item); item = new Item().withPrimaryKey("Id", 202).withString("Title", "21-Bike-202") .withString("Description", "202 Description").withString("BicycleType", "Road") .withString("Brand", "Brand-Company A").withNumber("Price", 200) .withStringSet("Color", new HashSet<String>(Arrays.asList("Green", "Black"))) .withString("ProductCategory", "Bicycle"); table.putItem(item); item = new Item().withPrimaryKey("Id", 203).withString("Title", "19-Bike-203") .withString("Description", "203 Description").withString("BicycleType", "Road") .withString("Brand", "Brand-Company B").withNumber("Price", 300) .withStringSet("Color", new HashSet<String>(Arrays.asList("Red", "Green", "Black"))) .withString("ProductCategory", "Bicycle"); table.putItem(item); item = new Item().withPrimaryKey("Id", 204).withString("Title", "18-Bike-204") .withString("Description", "204 Description").withString("BicycleType", "Mountain") .withString("Brand", "Brand-Company B").withNumber("Price", 400) .withStringSet("Color", new HashSet<String>(Arrays.asList("Red"))) .withString("ProductCategory", "Bicycle"); table.putItem(item); item = new Item().withPrimaryKey("Id", 205).withString("Title", "20-Bike-205") .withString("Description", "205 Description").withString("BicycleType", "Hybrid") .withString("Brand", "Brand-Company C").withNumber("Price", 500) .withStringSet("Color", new HashSet<String>(Arrays.asList("Red", "Black"))) .withString("ProductCategory", "Bicycle"); table.putItem(item); } catch (Exception e) { System.err.println("Failed to create item in " + tableName); System.err.println(e.getMessage()); } } private static void loadSampleForums(String tableName) { Table table = dynamoDB.getTable(tableName); try { System.out.println("Adding data to " + tableName); Item item = new Item().withPrimaryKey("Name", "Amazon DynamoDB") .withString("Category", "Amazon Web Services").withNumber("Threads", 2).withNumber("Messages", 4) .withNumber("Views", 1000); table.putItem(item); item = new Item().withPrimaryKey("Name", "Amazon S3").withString("Category", "Amazon Web Services") .withNumber("Threads", 0); table.putItem(item); } catch (Exception e) { System.err.println("Failed to create item in " + tableName); System.err.println(e.getMessage()); } } private static void loadSampleThreads(String tableName) { try { long time1 = (new Date()).getTime() - (7 * 24 * 60 * 60 * 1000); // 7 // days // ago long time2 = (new Date()).getTime() - (14 * 24 * 60 * 60 * 1000); // 14 // days // ago long time3 = (new Date()).getTime() - (21 * 24 * 60 * 60 * 1000); // 21 // days // ago Date date1 = new Date(); date1.setTime(time1); Date date2 = new Date(); date2.setTime(time2); Date date3 = new Date(); date3.setTime(time3); dateFormatter.setTimeZone(TimeZone.getTimeZone("UTC")); Table table = dynamoDB.getTable(tableName); System.out.println("Adding data to " + tableName); Item item = new Item().withPrimaryKey("ForumName", "Amazon DynamoDB") .withString("Subject", "DynamoDB Thread 1").withString("Message", "DynamoDB thread 1 message") .withString("LastPostedBy", "User A").withString("LastPostedDateTime", dateFormatter.format(date2)) .withNumber("Views", 0).withNumber("Replies", 0).withNumber("Answered", 0) .withStringSet("Tags", new HashSet<String>(Arrays.asList("index", "primarykey", "table"))); table.putItem(item); item = new Item().withPrimaryKey("ForumName", "Amazon DynamoDB").withString("Subject", "DynamoDB Thread 2") .withString("Message", "DynamoDB thread 2 message").withString("LastPostedBy", "User A") .withString("LastPostedDateTime", dateFormatter.format(date3)).withNumber("Views", 0) .withNumber("Replies", 0).withNumber("Answered", 0) .withStringSet("Tags", new HashSet<String>(Arrays.asList("index", "partitionkey", "sortkey"))); table.putItem(item); item = new Item().withPrimaryKey("ForumName", "Amazon S3").withString("Subject", "S3 Thread 1") .withString("Message", "S3 Thread 3 message").withString("LastPostedBy", "User A") .withString("LastPostedDateTime", dateFormatter.format(date1)).withNumber("Views", 0) .withNumber("Replies", 0).withNumber("Answered", 0) .withStringSet("Tags", new HashSet<String>(Arrays.asList("largeobjects", "multipart upload"))); table.putItem(item); } catch (Exception e) { System.err.println("Failed to create item in " + tableName); System.err.println(e.getMessage()); } } private static void loadSampleReplies(String tableName) { try { // 1 day ago long time0 = (new Date()).getTime() - (1 * 24 * 60 * 60 * 1000); // 7 days ago long time1 = (new Date()).getTime() - (7 * 24 * 60 * 60 * 1000); // 14 days ago long time2 = (new Date()).getTime() - (14 * 24 * 60 * 60 * 1000); // 21 days ago long time3 = (new Date()).getTime() - (21 * 24 * 60 * 60 * 1000); Date date0 = new Date(); date0.setTime(time0); Date date1 = new Date(); date1.setTime(time1); Date date2 = new Date(); date2.setTime(time2); Date date3 = new Date(); date3.setTime(time3); dateFormatter.setTimeZone(TimeZone.getTimeZone("UTC")); Table table = dynamoDB.getTable(tableName); System.out.println("Adding data to " + tableName); // Add threads. Item item = new Item().withPrimaryKey("Id", "Amazon DynamoDB#DynamoDB Thread 1") .withString("ReplyDateTime", (dateFormatter.format(date3))) .withString("Message", "DynamoDB Thread 1 Reply 1 text").withString("PostedBy", "User A"); table.putItem(item); item = new Item().withPrimaryKey("Id", "Amazon DynamoDB#DynamoDB Thread 1") .withString("ReplyDateTime", dateFormatter.format(date2)) .withString("Message", "DynamoDB Thread 1 Reply 2 text").withString("PostedBy", "User B"); table.putItem(item); item = new Item().withPrimaryKey("Id", "Amazon DynamoDB#DynamoDB Thread 2") .withString("ReplyDateTime", dateFormatter.format(date1)) .withString("Message", "DynamoDB Thread 2 Reply 1 text").withString("PostedBy", "User A"); table.putItem(item); item = new Item().withPrimaryKey("Id", "Amazon DynamoDB#DynamoDB Thread 2") .withString("ReplyDateTime", dateFormatter.format(date0)) .withString("Message", "DynamoDB Thread 2 Reply 2 text").withString("PostedBy", "User A"); table.putItem(item); } catch (Exception e) { System.err.println("Failed to create item in " + tableName); System.err.println(e.getMessage()); } } }