如何仅使用分区键从 aws Dynamodb 获取数据？

Question

I am using aws-sdk-go library for DynamoDb connectivity in Golang.

My DynamoDb table have a Partition key DeviceId (String) and a Sort Key Time (Number). How can I write GetItemInput to get all data with a specific DeviceId?

params := &dynamodb.GetItemInput{

    Key:    map[string]*dynamodb.AttributeValue {
        "DeviceId": {
            S: aws.String("item_1"),
        },
    },
    ExpressionAttributeNames: map[string]*string{
        "DeviceId": "DeviceId",
    },
    TableName:  aws.String("DbName"), 
}

list, err := svc.GetItem(params)

Answer 1

You have to use Query or Scan operation, this is a simple example but you can read more on Amazon documentation here

In particular, Query operation

A Query operation finds items in a table or a secondary index using only primary key attribute values

var queryInput = &dynamodb.QueryInput{
    TableName: aws.String(dynamoRestDataTableName),
    KeyConditions: map[string]*dynamodb.Condition{
        "DeviceId": {
            ComparisonOperator: aws.String("EQ"),
            AttributeValueList: []*dynamodb.AttributeValue{
                {
                    S: aws.String("aDeviceId"),
                },
            },
        },
    },
}

var resp, err = dynamoSvc.Query(queryInput)
if err != nil {
    return nil, err
}

Answer 2

Query operation can be used in that case
Following is one generic example for the same

compositeKey := entity.GetPrimaryKey(inputVar)
expressionAttributeValues := map[string]*dynamodb.AttributeValue{
    ":v1": {
        S: aws.String(compositeKey.PartitionKey.Data.(string)),
    },
}
queryInput := dynamodb.QueryInput{
    TableName:                 &d.TableName,
    KeyConditionExpression:    aws.String("id = :v1"),
    ExpressionAttributeValues: expressionAttributeValues,
}
queryOutput, err := d.DdbSession.Query(&queryInput)
if err != nil {
    log.Error("error in fetching records ", err)
    return nil, err
}

// unmarshal the query output - items to interface

err = dynamodbattribute.UnmarshalListOfMaps(queryOutput.Items, &yourInterface)

Answer 3

You can use getItem in JavaScript SDK v2 like this

const params = {
    TableName: 'tableName',
    Key: {
        id: { S: id },
    },
};

const result = await dynamoDb.getItem(params).promise();
if (result.Item === undefined) {
    throw new Error('not found');
}
const item = AWS.DynamoDB.Converter.unmarshall(result.Item)

If JavaScript SDK can do this, I assume golang SDK can also. If not, that means AWS doesn't take all languages equally?