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DynamoDBで一部の属性のみを取得する(プロジェクション式)--projection-expression

テーブルからデータを読み取るには、GetItem、Query や Scan などのオペレーションを使用します。Amazon DynamoDB は、デフォルトですべての項目属性を返します。すべての属性ではなく、一部の属性のみを取得するには、プロジェクション式を使用します。

key.json
{
    "Id": { "N": "123" }
}

まずは、--projection-expression なしですべての項目を呼び出してみる。

$ aws dynamodb get-item \
--table-name testprojectionexpression \
--key file://key.json

{
    "Item": {
        "Description": {
            "S": "test"
        },
        "name": {
            "S": "sato"
        },
        "Id": {
            "N": "123"
        }
    }
}

--projection-expression で Description のみを呼び出してみる。

$ aws dynamodb get-item --table-name ProductCatalog \
--key file://key.json \
--projection-expression "Description"

{
    "Item": {
        "Description": {
            "S": "test"
        }
    }
}
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