dynamoDB数据库
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- 首先安装AWSCLI
- 安装后；在cmd输入
aws --version检验是否安装成功 - 然后；在cmd输入：
aws configure设置aws的密钥 - 最后使用一下代码进行数据库的CRUD操作
- 如果能帮助大家请手动点赞
package com.skysoft.modules.controller;import com.amazonaws.services.dynamodbv2.AmazonDynamoDB;import com.amazonaws.services.dynamodbv2.AmazonDynamoDBClientBuilder;import com.amazonaws.services.dynamodbv2.document.*;import com.amazonaws.services.dynamodbv2.document.spec.*;import com.amazonaws.services.dynamodbv2.document.utils.NameMap;import com.amazonaws.services.dynamodbv2.document.utils.ValueMap;import com.amazonaws.services.dynamodbv2.model.*;import com.fasterxml.jackson.core.JsonFactory;import com.fasterxml.jackson.core.JsonParser;import com.fasterxml.jackson.databind.JsonNode;import com.fasterxml.jackson.databind.ObjectMapper;import com.fasterxml.jackson.databind.node.ObjectNode;import org.junit.Test;import java.io.File;import java.io.IOException;import java.util.Arrays;import java.util.HashMap;import java.util.Iterator;import java.util.Map;/** * 创建表Movies * Created by hyq on 2017/5/16. */public class MoviesCreateTable { public static void main(String[] args) { //加载驱动 AmazonDynamoDB client = AmazonDynamoDBClientBuilder.standard().build(); //建立连接 DynamoDB dynamoDB = new DynamoDB(client); //表名 String tableName = "Movies"; try { System.out.println("Attempting to create table; please wait..."); //创建表 Table table = dynamoDB.createTable(tableName, Arrays.asList(new KeySchemaElement("year", KeyType.HASH), // KeySchemaElement 用于主键的属性 new KeySchemaElement("title", KeyType.RANGE)), // Sort key Arrays.asList(new AttributeDefinition("year", ScalarAttributeType.N), new AttributeDefinition("title", ScalarAttributeType.S)),//键架构属性的数据类型。 new ProvisionedThroughput(10L, 10L)); table.waitForActive(); System.out.println("Success. Table status: " + table.getDescription().getTableStatus()); } catch (Exception e) { System.err.println("Unable to create table: "); System.err.println(e.getMessage()); } } /** * 数据加载 */ @Test public void MoviesLoadData() throws IOException { //加载驱动 AmazonDynamoDB client = AmazonDynamoDBClientBuilder.standard().build(); //建立连接 DynamoDB dynamoDB = new DynamoDB(client); //获取Movies表 Table table = dynamoDB.getTable("Movies"); //获取json文件 JsonParser parser = new JsonFactory().createParser(new File("E:\\IdeaWorkSpace\\dynamodbdemo\\src\\main\\resources\\test.json")); JsonNode rootNode = new ObjectMapper().readTree(parser); Iterator<JsonNode> iter = rootNode.iterator(); ObjectNode currentNode; //遍历json对象实现循环添加 while (iter.hasNext()) { currentNode = (ObjectNode) iter.next(); int year = currentNode.path("year").asInt(); String title = currentNode.path("title").asText(); try { table.putItem(new Item().withPrimaryKey("year", year, "title", title).withJSON("info", currentNode.path("info").toString())); System.out.println("PutItem succeeded: " + year + " " + title); } catch (Exception e) { System.err.println("Unable to add movie: " + year + " " + title); System.err.println(e.getMessage()); break; } } System.out.println("test success"); parser.close(); } /** * 添加操作 * 创建一个新的项目 * 您将新项目添加到Movies表中 */ @Test public void MoviesCreateItem() { //加载驱动 AmazonDynamoDB client = AmazonDynamoDBClientBuilder.standard().build(); //建立连接 DynamoDB dynamoDB = new DynamoDB(client); //获取Movies表 Table table = dynamoDB.getTable("Movies"); //参数 int year = 2015; String title = "The Big New Movie"; //info信息 final Map<String, Object> infoMap = new HashMap<String, Object>(); infoMap.put("plot", "Nothing happens at all."); infoMap.put("rating", 0); //添加 try { System.out.println("Adding a new item..."); PutItemOutcome outcome = table .putItem(new Item().withPrimaryKey("year", year, "title", title).withMap("info", infoMap)); System.out.println("PutItem succeeded:\n" + outcome.getPutItemResult()); } catch (Exception e) { System.err.println("Unable to add item: " + year + " " + title); System.err.println(e.getMessage()); } } /** * getItem方法从Movies表中读取该项 */ @Test public void MoviesGetItem() { //加载驱动 AmazonDynamoDB client = AmazonDynamoDBClientBuilder.standard().build(); //建立连接 DynamoDB dynamoDB = new DynamoDB(client); //获取Movies表 Table table = dynamoDB.getTable("Movies"); int year = 2015; String title = "The Big New Movie"; GetItemSpec spec = new GetItemSpec().withPrimaryKey("year", year, "title", title); try { System.out.println("Attempting to read the item..."); Item outcome = table.getItem(spec); System.out.println("GetItem succeeded: " + outcome); } catch (Exception e) { System.err.println("Unable to read item: " + year + " " + title); System.err.println(e.getMessage()); } } /** * 您可以使用该updateItem方法修改现有项目。 * 可以更新现有属性的值，添加新属性或删除属性 */ @Test public void MoviesUpdateItem() { //加载驱动 AmazonDynamoDB client = AmazonDynamoDBClientBuilder.standard().build(); //建立连接 DynamoDB dynamoDB = new DynamoDB(client); //获取Movies表 Table table = dynamoDB.getTable("Movies"); int year = 2015; String title = "The Big New Movie"; UpdateItemSpec updateItemSpec = new UpdateItemSpec().withPrimaryKey("year", year, "title", title) .withUpdateExpression("set info.rating = :r, info.plot=:p, info.actors=:a") .withValueMap(new ValueMap().withNumber(":r", 5.5).withString(":p", "Everything happens all at once.") .withList(":a", Arrays.asList("Larry", "Moe", "Curly"))) .withReturnValues(ReturnValue.UPDATED_NEW); try { System.out.println("Updating the item..."); UpdateItemOutcome outcome = table.updateItem(updateItemSpec); System.out.println("UpdateItem succeeded:\n" + outcome.getItem().toJSONPretty()); } catch (Exception e) { System.err.println("Unable to update item: " + year + " " + title); System.err.println(e.getMessage()); } } /** * 原子计数器: * 您可以使用该updateItem方法来 * 增加或减少现有属性的值， * 而不会影响其他写入请求 */ @Test public void MoviesContentItem() { //加载驱动 AmazonDynamoDB client = AmazonDynamoDBClientBuilder.standard().build(); //建立连接 DynamoDB dynamoDB = new DynamoDB(client); //获取Movies表 Table table = dynamoDB.getTable("Movies"); int year = 2015; String title = "The Big New Movie"; UpdateItemSpec updateItemSpec = new UpdateItemSpec().withPrimaryKey("year", year, "title", title) .withUpdateExpression("set info.rating = info.rating + :val")//每次+1 .withValueMap(new ValueMap().withNumber(":val", 1)).withReturnValues(ReturnValue.UPDATED_NEW); try { System.out.println("Incrementing an atomic counter..."); UpdateItemOutcome outcome = table.updateItem(updateItemSpec); System.out.println("UpdateItem succeeded:\n" + outcome.getItem().toJSONPretty()); } catch (Exception e) { System.err.println("Unable to update item: " + year + " " + title); System.err.println(e.getMessage()); } } /** * 以下程序显示如何使用UpdateItem条件。 * 如果条件求值为true，则更新成功; 否则，不执行更新。 */ @Test public void updateItem() { //加载驱动 AmazonDynamoDB client = AmazonDynamoDBClientBuilder.standard().build(); //建立连接 DynamoDB dynamoDB = new DynamoDB(client); //获取Movies表 Table table = dynamoDB.getTable("Movies"); int year = 2015; String title = "The Big New Movie"; UpdateItemSpec updateItemSpec = new UpdateItemSpec() .withPrimaryKey(new PrimaryKey("year", year, "title", title)).withUpdateExpression("remove info.actors[0]") .withConditionExpression("size(info.actors) > :num").withValueMap(new ValueMap().withNumber(":num", 1)) .withReturnValues(ReturnValue.UPDATED_NEW); // Conditional update (we expect this to fail) try { System.out.println("Attempting a conditional update..."); UpdateItemOutcome outcome = table.updateItem(updateItemSpec); System.out.println("UpdateItem succeeded:\n" + outcome.getItem().toJSONPretty()); } catch (Exception e) { System.err.println("Unable to update item: " + year + " " + title); System.err.println(e.getMessage()); } } /** * 您可以使用该deleteItem方法通过指定其主键来删除一个项目。 * 如果不满足条件，您可以选择提供一个ConditionExpression以防止项目删除。 */ @Test public void deleteItem() { //加载驱动 AmazonDynamoDB client = AmazonDynamoDBClientBuilder.standard().build(); //建立连接 DynamoDB dynamoDB = new DynamoDB(client); //获取Movies表 Table table = dynamoDB.getTable("Movies"); int year = 2015; String title = "The Big New Movie"; DeleteItemSpec deleteItemSpec = new DeleteItemSpec() .withPrimaryKey(new PrimaryKey("year", year, "title", title)).withConditionExpression("info.rating <= :val") .withValueMap(new ValueMap().withNumber(":val", 8.0)); // Conditional delete (we expect this to fail) try { System.out.println("Attempting a conditional delete..."); table.deleteItem(deleteItemSpec); System.out.println("DeleteItem succeeded"); } catch (Exception e) { System.err.println("Unable to delete item: " + year + " " + title); System.err.println(e.getMessage()); } } /** * 查询 */ @Test public void MoviesQuery() { //加载驱动 AmazonDynamoDB client = AmazonDynamoDBClientBuilder.standard().build(); //建立连接 DynamoDB dynamoDB = new DynamoDB(client); //获取Movies表 Table table = dynamoDB.getTable("Movies"); HashMap<String, String> nameMap = new HashMap<String, String>(); nameMap.put("#yr", "year"); HashMap<String, Object> valueMap = new HashMap<String, Object>(); valueMap.put(":yyyy", 2013); QuerySpec querySpec = new QuerySpec().withKeyConditionExpression("#yr = :yyyy") .withNameMap(nameMap).withValueMap(valueMap); ItemCollection<QueryOutcome> items = null; Iterator<Item> iterator = null; Item item = null; try { System.out.println("Movies from 2013"); items = table.query(querySpec); iterator = items.iterator(); while (iterator.hasNext()) { item = iterator.next(); System.out.println(item.getNumber("year") + ": " + item.getString("title")); } } catch (Exception e) { System.err.println("Unable to query movies from 2013"); System.err.println(e.getMessage()); }// valueMap.put(":yyyy", 1992);// valueMap.put(":letter1", "A");// valueMap.put(":letter2", "L");//// querySpec.withProjectionExpression("#yr, title, info.genres, info.actors[0]")// .withKeyConditionExpression("#yr = :yyyy and title between :letter1 and :letter2").withNameMap(nameMap)// .withValueMap(valueMap);//// try {// System.out.println("Movies from 1992 - titles A-L, with genres and lead actor");// items = table.query(querySpec);//// iterator = items.iterator();// while (iterator.hasNext()) {// item = iterator.next();// System.out.println(item.getNumber("year") + ": " + item.getString("title") + " " + item.getMap("info"));// }//// } catch (Exception e) {// System.err.println("Unable to query movies from 1992:");// System.err.println(e.getMessage());// } } /** * 扫描 * ProjectionExpression 指定扫描结果中所需的属性。 * FilterExpression 指定只返回满足条件的项的条件。所有其他项目都被丢弃。 */ @Test public void MoviesScan() { //加载驱动 AmazonDynamoDB client = AmazonDynamoDBClientBuilder.standard().build(); //建立连接 DynamoDB dynamoDB = new DynamoDB(client); //获取Movies表 Table table = dynamoDB.getTable("Movies"); ScanSpec scanSpec = new ScanSpec().withProjectionExpression("#yr, title, info.rating") .withFilterExpression("#yr between :start_yr and :end_yr").withNameMap(new NameMap().with("#yr", "year")) .withValueMap(new ValueMap().withNumber(":start_yr", 2011).withNumber(":end_yr", 2015)); try { ItemCollection<ScanOutcome> items = table.scan(scanSpec); Iterator<Item> iter = items.iterator(); while (iter.hasNext()) { Item item = iter.next(); System.out.println(item.toString()); } } catch (Exception e) { System.err.println("Unable to scan the table:"); System.err.println(e.getMessage()); } } /** * 删表 跑路 */ public void deleteTeble(){ //加载驱动 AmazonDynamoDB client = AmazonDynamoDBClientBuilder.standard().build(); //建立连接 DynamoDB dynamoDB = new DynamoDB(client); //获取Movies表 Table table = dynamoDB.getTable("Movies"); try { System.out.println("Attempting to delete table; please wait..."); table.delete(); table.waitForDelete(); System.out.print("Success."); } catch (Exception e) { System.err.println("Unable to delete table: "); System.err.println(e.getMessage()); } }}阅读全文
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