dynamodb 在获取属性时遇到问题

Question

I want to get specific attributes(columns) in my dynamo query and getting error.

    table = get_dynamodb_table()
    response = table.query(
        AttributesToGet=["USER_ID","NODE_TYPE"],
        IndexName='GSI3',
        KeyConditionExpression="GSI3_ACCOUNT_PK = 2 AND GSI3_UPDATED_ON BETWEEN 1231231 AND123")

but when I am trying to run this I am getting this error

botocore.exceptions.ClientError: An error occurred (ValidationException) when calling the Query operation: Can not use both expression and non-expression parameters in the same request: Non-expression parameters: {AttributesToGet} Expression parameters: {KeyConditionExpression}

Answer 1

Try using ProjectionExpression instead. As the docs at https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/LegacyConditionalParameters.AttributesToGet.html explain, AttributesToGet is an older style and doesn't work in combo with newer expression features. That's what the error means.