# Hello Amazon RDS
<a name="example_rds_Hello_section"></a>

次のコード例は、Amazon RDS の使用を開始する方法を示しています。

------
#### [ .NET ]

**SDK for .NET**  
 GitHub には、その他のリソースもあります。[AWS コード例リポジトリ](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/dotnetv3/RDS#code-examples)で完全な例を見つけて、設定と実行の方法を確認してください。

```
using System;
using System.Threading.Tasks;
using Amazon.RDS;
using Amazon.RDS.Model;

namespace RDSActions;

public static class HelloRds
{
    static async Task Main(string[] args)
    {
        var rdsClient = new AmazonRDSClient();

        Console.WriteLine($"Hello Amazon RDS! Following are some of your DB instances:");
        Console.WriteLine();

        // You can use await and any of the async methods to get a response.
        // Let's get the first twenty DB instances.
        var response = await rdsClient.DescribeDBInstancesAsync(
            new DescribeDBInstancesRequest()
            {
                MaxRecords = 20 // Must be between 20 and 100.
            });

        foreach (var instance in response.DBInstances)
        {
            Console.WriteLine($"\tDB name: {instance.DBName}");
            Console.WriteLine($"\tArn: {instance.DBInstanceArn}");
            Console.WriteLine($"\tIdentifier: {instance.DBInstanceIdentifier}");
            Console.WriteLine();
        }
    }
}
```
+  API の詳細については、*AWS SDK for .NET API リファレンス*の「[DescribeDBInstances](https://docs.aws.amazon.com/goto/DotNetSDKV3/rds-2014-10-31/DescribeDBInstances)」を参照してください。

------
#### [ C\$1\$1 ]

**SDK for C\$1\$1**  
 GitHub には、その他のリソースもあります。[AWS コード例リポジトリ](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/cpp/example_code/rds/hello_rds#code-examples)で完全な例を見つけて、設定と実行の方法を確認してください。
CMakeLists.txt CMake ファイルのコード。  

```
# 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 rds)

# Set this project's name.
project("hello_rds")

# 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_rds.cpp)

target_link_libraries(${PROJECT_NAME}
        ${AWSSDK_LINK_LIBRARIES})
```
hello\$1rds.cpp ソースファイルのコード。  

```
#include <aws/core/Aws.h>
#include <aws/rds/RDSClient.h>
#include <aws/rds/model/DescribeDBInstancesRequest.h>
#include <iostream>

/*
 *  A "Hello Rds" starter application which initializes an Amazon Relational Database Service (Amazon RDS) client and
 *  describes the Amazon RDS instances.
 *
 *  main function
 *
 *  Usage: 'hello_rds'
 *
 */

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::RDS::RDSClient rdsClient(clientConfig);
        Aws::String marker;
        std::vector<Aws::String> instanceDBIDs;

        do {
            Aws::RDS::Model::DescribeDBInstancesRequest request;

            if (!marker.empty()) {
                request.SetMarker(marker);
            }

            Aws::RDS::Model::DescribeDBInstancesOutcome outcome =
                    rdsClient.DescribeDBInstances(request);

            if (outcome.IsSuccess()) {
                for (auto &instance: outcome.GetResult().GetDBInstances()) {
                    instanceDBIDs.push_back(instance.GetDBInstanceIdentifier());
                }
                marker = outcome.GetResult().GetMarker();
            } else {
                result = 1;
                std::cerr << "Error with RDS::DescribeDBInstances. "
                          << outcome.GetError().GetMessage()
                          << std::endl;
                break;
            }
        } while (!marker.empty());

        std::cout << instanceDBIDs.size() << " RDS instances found." << std::endl;
        for (auto &instanceDBID: instanceDBIDs) {
            std::cout << "   Instance: " << instanceDBID << std::endl;
        }
    }

    Aws::ShutdownAPI(options); // Should only be called once.
    return result;
}
```
+  API の詳細については、*AWS SDK for C\$1\$1 API リファレンス*の「[DescribeDBInstances](https://docs.aws.amazon.com/goto/SdkForCpp/rds-2014-10-31/DescribeDBInstances)」を参照してください。

------
#### [ Go ]

**SDK for Go V2**  
 GitHub には、その他のリソースもあります。[AWS コード例リポジトリ](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/rds#code-examples)で完全な例を見つけて、設定と実行の方法を確認してください。

```
package main

import (
	"context"
	"fmt"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/config"
	"github.com/aws/aws-sdk-go-v2/service/rds"
)

// main uses the AWS SDK for Go V2 to create an Amazon Relational Database Service (Amazon RDS)
// client and list up to 20 DB instances in your account.
// This example uses the default settings specified in your shared credentials
// and config files.
func main() {
	ctx := context.Background()
	sdkConfig, err := config.LoadDefaultConfig(ctx)
	if err != nil {
		fmt.Println("Couldn't load default configuration. Have you set up your AWS account?")
		fmt.Println(err)
		return
	}
	rdsClient := rds.NewFromConfig(sdkConfig)
	const maxInstances = 20
	fmt.Printf("Let's list up to %v DB instances.\n", maxInstances)
	output, err := rdsClient.DescribeDBInstances(ctx,
		&rds.DescribeDBInstancesInput{MaxRecords: aws.Int32(maxInstances)})
	if err != nil {
		fmt.Printf("Couldn't list DB instances: %v\n", err)
		return
	}
	if len(output.DBInstances) == 0 {
		fmt.Println("No DB instances found.")
	} else {
		for _, instance := range output.DBInstances {
			fmt.Printf("DB instance %v has database %v.\n", *instance.DBInstanceIdentifier,
				*instance.DBName)
		}
	}
}
```
+  API の詳細については、*AWS SDK for Go API リファレンス*の「[DescribeDBInstances](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.DescribeDBInstances)」を参照してください。

------
#### [ Java ]

**SDK for Java 2.x**  
 GitHub には、その他のリソースもあります。[AWS コード例リポジトリ](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/javav2/example_code/rds#code-examples)で完全な例を見つけて、設定と実行の方法を確認してください。

```
import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.rds.RdsClient;
import software.amazon.awssdk.services.rds.model.DescribeDbInstancesResponse;
import software.amazon.awssdk.services.rds.model.DBInstance;
import software.amazon.awssdk.services.rds.model.RdsException;
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 DescribeDBInstances {

    public static void main(String[] args) {
        Region region = Region.US_EAST_1;
        RdsClient rdsClient = RdsClient.builder()
                .region(region)
                .build();

        describeInstances(rdsClient);
        rdsClient.close();
    }

    public static void describeInstances(RdsClient rdsClient) {
        try {
            DescribeDbInstancesResponse response = rdsClient.describeDBInstances();
            List<DBInstance> instanceList = response.dbInstances();
            for (DBInstance instance : instanceList) {
                System.out.println("Instance ARN is: " + instance.dbInstanceArn());
                System.out.println("The Engine is " + instance.engine());
                System.out.println("Connection endpoint is" + instance.endpoint().address());
            }

        } catch (RdsException e) {
            System.out.println(e.getLocalizedMessage());
            System.exit(1);
        }
    }
}
```
+  API の詳細については、*AWS SDK for Java 2.x API リファレンス*の「[DescribeDBInstances](https://docs.aws.amazon.com/goto/SdkForJavaV2/rds-2014-10-31/DescribeDBInstances)」を参照してください。

------
#### [ Python ]

**SDK for Python (Boto3)**  
 GitHub には、その他のリソースもあります。[AWS コード例リポジトリ](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/python/example_code/rds#code-examples)で完全な例を見つけて、設定と実行の方法を確認してください。

```
"""
Purpose

Shows how to use the AWS SDK for Python (Boto3) with the Amazon Relational Database Service
(Amazon RDS) to list the databases in your account.
"""

import boto3
from botocore.exceptions import ClientError

# Create an RDS client
rds_client = boto3.client("rds")

# Create a paginator for the describe_db_instances operation
paginator = rds_client.get_paginator("describe_db_instances")

try:
    # Use the paginator to get a list of DB instances
    response_iterator = paginator.paginate(
        PaginationConfig={
            "MaxItems": 123,
            "PageSize": 50,  # Adjust PageSize as needed
            "StartingToken": None,
        }
    )

    # Iterate through the pages of the response
    instances_found = False
    for page in response_iterator:
        if "DBInstances" in page and page["DBInstances"]:
            instances_found = True
            print("Your RDS instances are:")
            for db in page["DBInstances"]:
                print(db["DBInstanceIdentifier"])

    if not instances_found:
        print("No RDS instances found!")

except ClientError as e:
    print(f"Couldn't list RDS instances. Here's why: {e.response['Error']['Message']}")
```
+  API の詳細については、*AWS SDK for Python (Boto3) API リファレンス*の「[DescribeDBInstances](https://docs.aws.amazon.com/goto/boto3/rds-2014-10-31/DescribeDBInstances)」を参照してください。

------
#### [ Ruby ]

**SDK for Ruby**  
 GitHub には、その他のリソースもあります。[AWS コード例リポジトリ](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/ruby/example_code/rds#code-examples)で完全な例を見つけて、設定と実行の方法を確認してください。

```
require 'aws-sdk-rds'
require 'logger'

# RDSManager is a class responsible for managing RDS operations
# such as listing all RDS DB instances in the current AWS account.
class RDSManager
  def initialize(client)
    @client = client
    @logger = Logger.new($stdout)
  end

  # Lists and prints all RDS DB instances in the current AWS account.
  def list_db_instances
    @logger.info('Listing RDS DB instances')

    paginator = @client.describe_db_instances
    instances = []

    paginator.each_page do |page|
      instances.concat(page.db_instances)
    end

    if instances.empty?
      @logger.info('No instances found.')
    else
      @logger.info("Found #{instances.count} instance(s):")
      instances.each do |instance|
        @logger.info(" * #{instance.db_instance_identifier} (#{instance.db_instance_status})")
      end
    end
  end
end

if $PROGRAM_NAME == __FILE__
  rds_client = Aws::RDS::Client.new(region: 'us-west-2')
  manager = RDSManager.new(rds_client)
  manager.list_db_instances
end
```
+  API の詳細については、*AWS SDK for Ruby API リファレンス*の「[DescribeDBInstances](https://docs.aws.amazon.com/goto/SdkForRubyV3/rds-2014-10-31/DescribeDBInstances)」を参照してください。

------

AWS SDK デベロッパーガイドとコード例の詳細なリストについては、[このサービスを AWS SDK で使用する](CHAP_Tutorials.md#sdk-general-information-section) を参照してください。このトピックには、使用開始方法に関する情報と、以前の SDK バージョンの詳細も含まれています。