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# Bekerja dengan Item di DynamoDB
<a name="examples-dynamodb-items"></a>

**Di DynamoDB, item adalah kumpulan atribut, yang masing-masing *memiliki* nama dan nilai.** Nilai atribut dapat berupa skalar, set, atau jenis dokumen. Untuk informasi selengkapnya, lihat [Aturan Penamaan dan Jenis Data](https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/HowItWorks.NamingRulesDataTypes.html) di Panduan Pengembang Amazon DynamoDB.

## Mengambil Item dari Tabel
<a name="dynamodb-get-item"></a>

Panggil metode klien [`GetItem`DynamoDB](https://docs.aws.amazon.com/sdk-for-cpp/latest/api/aws-cpp-sdk-dynamodb/html/class_aws_1_1_dynamo_d_b_1_1_dynamo_d_b_client.html). Berikan [GetItemRequest](https://docs.aws.amazon.com/sdk-for-cpp/latest/api/aws-cpp-sdk-dynamodb/html/class_aws_1_1_dynamo_d_b_1_1_model_1_1_get_item_request.html)objek dengan nama tabel dan nilai kunci primer dari item yang Anda inginkan. Ia mengembalikan sebuah [GetItemResult](https://docs.aws.amazon.com/sdk-for-cpp/latest/api/aws-cpp-sdk-dynamodb/html/class_aws_1_1_dynamo_d_b_1_1_model_1_1_get_item_result.html)objek.

Anda dapat menggunakan `GetItem()` metode `GetItemResult` objek yang dikembalikan untuk mengambil [AttributeValue](https://docs.aws.amazon.com/sdk-for-cpp/latest/api/aws-cpp-sdk-dynamodb/html/class_aws_1_1_dynamo_d_b_1_1_model_1_1_attribute_value.html)pasangan kunci `Aws::String` dan nilai yang `Aws::Map` terkait dengan item tersebut.

 **Termasuk** 

```
#include <aws/core/Aws.h>
#include <aws/dynamodb/DynamoDBClient.h>
#include <aws/dynamodb/model/AttributeDefinition.h>
#include <aws/dynamodb/model/GetItemRequest.h>
#include <iostream>
```

 **Kode** 

```
//! Get an item from an Amazon DynamoDB table.
/*!
  \sa getItem()
  \param tableName: The table name.
  \param partitionKey: The partition key.
  \param partitionValue: The value for the partition key.
  \param clientConfiguration: AWS client configuration.
  \return bool: Function succeeded.
 */

bool AwsDoc::DynamoDB::getItem(const Aws::String &tableName,
                               const Aws::String &partitionKey,
                               const Aws::String &partitionValue,
                               const Aws::Client::ClientConfiguration &clientConfiguration) {
    Aws::DynamoDB::DynamoDBClient dynamoClient(clientConfiguration);
    Aws::DynamoDB::Model::GetItemRequest request;

    // Set up the request.
    request.SetTableName(tableName);
    request.AddKey(partitionKey,
                   Aws::DynamoDB::Model::AttributeValue().SetS(partitionValue));

    // Retrieve the item's fields and values.
    const Aws::DynamoDB::Model::GetItemOutcome &outcome = dynamoClient.GetItem(request);
    if (outcome.IsSuccess()) {
        // Reference the retrieved fields/values.
        const Aws::Map<Aws::String, Aws::DynamoDB::Model::AttributeValue> &item = outcome.GetResult().GetItem();
        if (!item.empty()) {
            // Output each retrieved field and its value.
            for (const auto &i: item)
                std::cout << "Values: " << i.first << ": " << i.second.GetS()
                          << std::endl;
        }
        else {
            std::cout << "No item found with the key " << partitionKey << std::endl;
        }
    }
    else {
        std::cerr << "Failed to get item: " << outcome.GetError().GetMessage();
    }

    return outcome.IsSuccess();
}
```

Lihat [contoh lengkapnya](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/cpp/example_code/dynamodb/get_item.cpp) di GitHub.

## Menambahkan Item ke Tabel
<a name="dynamodb-add-item"></a>

Buat [AttributeValue](https://docs.aws.amazon.com/sdk-for-cpp/latest/api/aws-cpp-sdk-dynamodb/html/class_aws_1_1_dynamo_d_b_1_1_model_1_1_attribute_value.html)pasangan kunci `Aws::String` dan nilai yang mewakili setiap item. Ini harus menyertakan nilai untuk bidang kunci utama tabel. Jika item yang diidentifikasi oleh kunci utama sudah ada, bidangnya *diperbarui* oleh permintaan. Tambahkan mereka ke [PutItemRequest](https://docs.aws.amazon.com/sdk-for-cpp/latest/api/aws-cpp-sdk-dynamodb/html/class_aws_1_1_dynamo_d_b_1_1_model_1_1_put_item_request.html)menggunakan `AddItem` metode ini.

 **Termasuk** 

```
#include <aws/core/Aws.h>
#include <aws/dynamodb/DynamoDBClient.h>
#include <aws/dynamodb/model/AttributeDefinition.h>
#include <aws/dynamodb/model/PutItemRequest.h>
#include <aws/dynamodb/model/PutItemResult.h>
#include <iostream>
```

 **Kode** 

```
//! Put an item in an Amazon DynamoDB table.
/*!
  \sa putItem()
  \param tableName: The table name.
  \param artistKey: The artist key. This is the partition key for the table.
  \param artistValue: The artist value.
  \param albumTitleKey: The album title key.
  \param albumTitleValue: The album title value.
  \param awardsKey: The awards key.
  \param awardsValue: The awards value.
  \param songTitleKey: The song title key.
  \param songTitleValue: The song title value.
  \param clientConfiguration: AWS client configuration.
  \return bool: Function succeeded.
 */
bool AwsDoc::DynamoDB::putItem(const Aws::String &tableName,
                               const Aws::String &artistKey,
                               const Aws::String &artistValue,
                               const Aws::String &albumTitleKey,
                               const Aws::String &albumTitleValue,
                               const Aws::String &awardsKey,
                               const Aws::String &awardsValue,
                               const Aws::String &songTitleKey,
                               const Aws::String &songTitleValue,
                               const Aws::Client::ClientConfiguration &clientConfiguration) {
    Aws::DynamoDB::DynamoDBClient dynamoClient(clientConfiguration);

    Aws::DynamoDB::Model::PutItemRequest putItemRequest;
    putItemRequest.SetTableName(tableName);

    putItemRequest.AddItem(artistKey, Aws::DynamoDB::Model::AttributeValue().SetS(
            artistValue)); // This is the hash key.
    putItemRequest.AddItem(albumTitleKey, Aws::DynamoDB::Model::AttributeValue().SetS(
            albumTitleValue));
    putItemRequest.AddItem(awardsKey,
                           Aws::DynamoDB::Model::AttributeValue().SetS(awardsValue));
    putItemRequest.AddItem(songTitleKey,
                           Aws::DynamoDB::Model::AttributeValue().SetS(songTitleValue));

    const Aws::DynamoDB::Model::PutItemOutcome outcome = dynamoClient.PutItem(
            putItemRequest);
    if (outcome.IsSuccess()) {
        std::cout << "Successfully added Item!" << std::endl;
    }
    else {
        std::cerr << outcome.GetError().GetMessage() << std::endl;
        return false;
    }

    return waitTableActive(tableName, dynamoClient);
}
```

Lihat [contoh lengkapnya](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/cpp/example_code/dynamodb/put_item.cpp) di GitHub.

## Memperbarui Item yang Ada dalam Tabel
<a name="dynamodb-update-item"></a>

Anda dapat memperbarui atribut untuk item yang sudah ada dalam tabel dengan menggunakan `UpdateItem` metode DynamoDBClient, memberikan nama tabel, nilai kunci utama, dan bidang untuk memperbarui dan nilai yang sesuai.

 **Impor** 

```
#include <aws/core/Aws.h>
#include <aws/dynamodb/DynamoDBClient.h>
#include <aws/dynamodb/model/UpdateItemRequest.h>
#include <aws/dynamodb/model/UpdateItemResult.h>
#include <iostream>
```

 **Kode** 

```
//! Update an Amazon DynamoDB table item.
/*!
  \sa updateItem()
  \param tableName: The table name.
  \param partitionKey: The partition key.
  \param partitionValue: The value for the partition key.
  \param attributeKey: The key for the attribute to be updated.
  \param attributeValue: The value for the attribute to be updated.
  \param clientConfiguration: AWS client configuration.
  \return bool: Function succeeded.
  */

/*
 *  The example code only sets/updates an attribute value. It processes
 *  the attribute value as a string, even if the value could be interpreted
 *  as a number. Also, the example code does not remove an existing attribute
 *  from the key value.
 */

bool AwsDoc::DynamoDB::updateItem(const Aws::String &tableName,
                                  const Aws::String &partitionKey,
                                  const Aws::String &partitionValue,
                                  const Aws::String &attributeKey,
                                  const Aws::String &attributeValue,
                                  const Aws::Client::ClientConfiguration &clientConfiguration) {
    Aws::DynamoDB::DynamoDBClient dynamoClient(clientConfiguration);

    // *** Define UpdateItem request arguments.
    // Define TableName argument.
    Aws::DynamoDB::Model::UpdateItemRequest request;
    request.SetTableName(tableName);

    // Define KeyName argument.
    Aws::DynamoDB::Model::AttributeValue attribValue;
    attribValue.SetS(partitionValue);
    request.AddKey(partitionKey, attribValue);

    // Construct the SET update expression argument.
    Aws::String update_expression("SET #a = :valueA");
    request.SetUpdateExpression(update_expression);

    // Construct attribute name argument.
    Aws::Map<Aws::String, Aws::String> expressionAttributeNames;
    expressionAttributeNames["#a"] = attributeKey;
    request.SetExpressionAttributeNames(expressionAttributeNames);

    // Construct attribute value argument.
    Aws::DynamoDB::Model::AttributeValue attributeUpdatedValue;
    attributeUpdatedValue.SetS(attributeValue);
    Aws::Map<Aws::String, Aws::DynamoDB::Model::AttributeValue> expressionAttributeValues;
    expressionAttributeValues[":valueA"] = attributeUpdatedValue;
    request.SetExpressionAttributeValues(expressionAttributeValues);

    // Update the item.
    const Aws::DynamoDB::Model::UpdateItemOutcome &outcome = dynamoClient.UpdateItem(
            request);
    if (outcome.IsSuccess()) {
        std::cout << "Item was updated" << std::endl;
    } else {
        std::cerr << outcome.GetError().GetMessage() << std::endl;
        return false;
    }

    return waitTableActive(tableName, dynamoClient);
}
```

Lihat [contoh lengkapnya](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/cpp/example_code/dynamodb/update_item.cpp).

## Info Selengkapnya
<a name="more-info"></a>
+  [Pedoman untuk Bekerja dengan Item](https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/GuidelinesForItems.html) di Panduan Pengembang Amazon DynamoDB
+  [Bekerja dengan Item di DynamoDB](https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/WorkingWithItems.html) di Panduan Pengembang Amazon DynamoDB