DynamoDB에서 반환 할 필드를 선택할 수 있습니까?

Question

dynamodb 쿼리 또는 스캔 결과에 어떤 필드를 포함 시킬지 선택할 수있는 방법이 있는지 궁금합니다. 나는 AttributesToGet에게

def filter_ga_account_by_email(self, email): 
    response = Table.scan(
     FilterExpression=Attr('client_email').eq(email), 
     AttributesToGet=['id'], 
    ) 

    return response['Items'] 

를 사용하려고하고 지금은이 오류가 : ClientError: An error occurred (ValidationException) when calling the Scan operation: Can not use both expression and non-expression parameters in the same request: Non-expression parameters: {AttributesToGet} Expression parameters: {FilterExpression}

Answer 1

확인을

당신이 'AttributesToGet'를 사용할 수 있습니다

:

client = boto3.client('dynamodb') 

response = client.get_item(TableName='tbl_name', Key={'client_email':{'N':str(email)}}, AttributesToGet=['id']) 

하지만주의하십시오

This is a legacy parameter, for backward compatibility. New applications should use ProjectionExpression instead. Do not combine legacy parameters and expression parameters in a single call; otherwise, DynamoDB will return a ValidationException exception. This parameter allows you to retrieve attributes of type List or Map; however, it cannot retrieve individual elements within a List or a Map.

http://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_Query.html#API_Query_RequestSyntax