Hello DynamoDB - Amazon DynamoDB
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Hello DynamoDB

The following code examples show how to get started using DynamoDB.

.NET
Amazon SDK for .NET
Note

There's more on GitHub. Find the complete example and learn how to set up and run in the Amazon Code Examples Repository.

using Amazon.DynamoDBv2; using Amazon.DynamoDBv2.Model; namespace DynamoDB_Actions; public static class HelloDynamoDB { static async Task Main(string[] args) { var dynamoDbClient = new AmazonDynamoDBClient(); Console.WriteLine($"Hello Amazon Dynamo DB! Following are some of your tables:"); Console.WriteLine(); // You can use await and any of the async methods to get a response. // Let's get the first five tables. var response = await dynamoDbClient.ListTablesAsync( new ListTablesRequest() { Limit = 5 }); foreach (var table in response.TableNames) { Console.WriteLine($"\tTable: {table}"); Console.WriteLine(); } } }
  • For API details, see ListTables in Amazon SDK for .NET API Reference.

C++
SDK for C++
Note

There's more on GitHub. Find the complete example and learn how to set up and run in the Amazon Code Examples Repository.

Code for the CMakeLists.txt CMake file.

# Set the minimum required version of CMake for this project. cmake_minimum_required(VERSION 3.13) # Set the AWS service components used by this project. set(SERVICE_COMPONENTS dynamodb) # Set this project's name. project("hello_dynamodb") # Set the C++ standard to use to build this target. # At least C++ 11 is required for the AWS SDK for C++. set(CMAKE_CXX_STANDARD 11) # Use the MSVC variable to determine if this is a Windows build. set(WINDOWS_BUILD ${MSVC}) if (WINDOWS_BUILD) # Set the location where CMake can find the installed libraries for the AWS SDK. string(REPLACE ";" "/aws-cpp-sdk-all;" SYSTEM_MODULE_PATH "${CMAKE_SYSTEM_PREFIX_PATH}/aws-cpp-sdk-all") list(APPEND CMAKE_PREFIX_PATH ${SYSTEM_MODULE_PATH}) endif () # Find the AWS SDK for C++ package. find_package(AWSSDK REQUIRED COMPONENTS ${SERVICE_COMPONENTS}) if (WINDOWS_BUILD AND AWSSDK_INSTALL_AS_SHARED_LIBS) # Copy relevant AWS SDK for C++ libraries into the current binary directory for running and debugging. # set(BIN_SUB_DIR "/Debug") # if you are building from the command line you may need to uncomment this # and set the proper subdirectory to the executables' location. AWSSDK_CPY_DYN_LIBS(SERVICE_COMPONENTS "" ${CMAKE_CURRENT_BINARY_DIR}${BIN_SUB_DIR}) endif () add_executable(${PROJECT_NAME} hello_dynamodb.cpp) target_link_libraries(${PROJECT_NAME} ${AWSSDK_LINK_LIBRARIES})

Code for the hello_dynamodb.cpp source file.

#include <aws/core/Aws.h> #include <aws/dynamodb/DynamoDBClient.h> #include <aws/dynamodb/model/ListTablesRequest.h> #include <iostream> /* * A "Hello DynamoDB" starter application which initializes an Amazon DynamoDB (DynamoDB) client and lists the * DynamoDB tables. * * main function * * Usage: 'hello_dynamodb' * */ int main(int argc, char **argv) { Aws::SDKOptions options; // Optionally change the log level for debugging. // options.loggingOptions.logLevel = Utils::Logging::LogLevel::Debug; Aws::InitAPI(options); // Should only be called once. int result = 0; { Aws::Client::ClientConfiguration clientConfig; // Optional: Set to the AWS Region (overrides config file). // clientConfig.region = "us-east-1"; Aws::DynamoDB::DynamoDBClient dynamodbClient(clientConfig); Aws::DynamoDB::Model::ListTablesRequest listTablesRequest; listTablesRequest.SetLimit(50); do { const Aws::DynamoDB::Model::ListTablesOutcome &outcome = dynamodbClient.ListTables( listTablesRequest); if (!outcome.IsSuccess()) { std::cout << "Error: " << outcome.GetError().GetMessage() << std::endl; result = 1; break; } for (const auto &tableName: outcome.GetResult().GetTableNames()) { std::cout << tableName << std::endl; } listTablesRequest.SetExclusiveStartTableName( outcome.GetResult().GetLastEvaluatedTableName()); } while (!listTablesRequest.GetExclusiveStartTableName().empty()); } Aws::ShutdownAPI(options); // Should only be called once. return result; }
  • For API details, see ListTables in Amazon SDK for C++ API Reference.

Java
SDK for Java 2.x
Note

There's more on GitHub. Find the complete example and learn how to set up and run in the Amazon Code Examples Repository.

import software.amazon.awssdk.regions.Region; import software.amazon.awssdk.services.dynamodb.DynamoDbClient; import software.amazon.awssdk.services.dynamodb.model.DynamoDbException; import software.amazon.awssdk.services.dynamodb.model.ListTablesRequest; import software.amazon.awssdk.services.dynamodb.model.ListTablesResponse; import java.util.List; /** * Before running this Java V2 code example, set up your development * environment, including your credentials. * * For more information, see the following documentation topic: * * https://docs.aws.amazon.com/sdk-for-java/latest/developer-guide/get-started.html */ public class ListTables { public static void main(String[] args) { System.out.println("Listing your Amazon DynamoDB tables:\n"); Region region = Region.US_EAST_1; DynamoDbClient ddb = DynamoDbClient.builder() .region(region) .build(); listAllTables(ddb); ddb.close(); } public static void listAllTables(DynamoDbClient ddb) { boolean moreTables = true; String lastName = null; while (moreTables) { try { ListTablesResponse response = null; if (lastName == null) { ListTablesRequest request = ListTablesRequest.builder().build(); response = ddb.listTables(request); } else { ListTablesRequest request = ListTablesRequest.builder() .exclusiveStartTableName(lastName).build(); response = ddb.listTables(request); } List<String> tableNames = response.tableNames(); if (tableNames.size() > 0) { for (String curName : tableNames) { System.out.format("* %s\n", curName); } } else { System.out.println("No tables found!"); System.exit(0); } lastName = response.lastEvaluatedTableName(); if (lastName == null) { moreTables = false; } } catch (DynamoDbException e) { System.err.println(e.getMessage()); System.exit(1); } } System.out.println("\nDone!"); } }
  • For API details, see ListTables in Amazon SDK for Java 2.x API Reference.

JavaScript
SDK for JavaScript (v3)
Note

There's more on GitHub. Find the complete example and learn how to set up and run in the Amazon Code Examples Repository.

For more details on working with DynamoDB in Amazon SDK for JavaScript, see Programming DynamoDB with JavaScript.

import { ListTablesCommand, DynamoDBClient } from "@aws-sdk/client-dynamodb"; const client = new DynamoDBClient({}); export const main = async () => { const command = new ListTablesCommand({}); const response = await client.send(command); console.log(response.TableNames.join("\n")); return response; };
  • For API details, see ListTables in Amazon SDK for JavaScript API Reference.

Python
SDK for Python (Boto3)
Note

There's more on GitHub. Find the complete example and learn how to set up and run in the Amazon Code Examples Repository.

import boto3 # Create a DynamoDB client using the default credentials and region dynamodb = boto3.client("dynamodb") # Initialize a paginator for the list_tables operation paginator = dynamodb.get_paginator("list_tables") # Create a PageIterator from the paginator page_iterator = paginator.paginate(Limit=10) # List the tables in the current AWS account print("Here are the DynamoDB tables in your account:") # Use pagination to list all tables table_names = [] for page in page_iterator: for table_name in page.get("TableNames", []): print(f"- {table_name}") table_names.append(table_name) if not table_names: print("You don't have any DynamoDB tables in your account.") else: print(f"\nFound {len(table_names)} tables.")
  • For API details, see ListTables in Amazon SDK for Python (Boto3) API Reference.

Ruby
SDK for Ruby
Note

There's more on GitHub. Find the complete example and learn how to set up and run in the Amazon Code Examples Repository.

require 'aws-sdk-dynamodb' require 'logger' # DynamoDBManager is a class responsible for managing DynamoDB operations # such as listing all tables in the current AWS account. class DynamoDBManager def initialize(client) @client = client @logger = Logger.new($stdout) end # Lists and prints all DynamoDB tables in the current AWS account. def list_tables @logger.info('Here are the DynamoDB tables in your account:') paginator = @client.list_tables(limit: 10) table_names = [] paginator.each_page do |page| page.table_names.each do |table_name| @logger.info("- #{table_name}") table_names << table_name end end if table_names.empty? @logger.info("You don't have any DynamoDB tables in your account.") else @logger.info("\nFound #{table_names.length} tables.") end end end if $PROGRAM_NAME == __FILE__ dynamodb_client = Aws::DynamoDB::Client.new manager = DynamoDBManager.new(dynamodb_client) manager.list_tables end
  • For API details, see ListTables in Amazon SDK for Ruby API Reference.

For a complete list of Amazon SDK developer guides and code examples, see Using DynamoDB with an Amazon SDK. This topic also includes information about getting started and details about previous SDK versions.