使用 python Boto3 在 DynamoDB 上进行扫描或查询操作

Question

I have users table, users have user_id field.

I need to get all the user details with given list, like ["1234","3456"].

There is no contain like queries in Boto3.

I'm using

response = table.scan(FilterExpression=Attr('user_id').is_in(["1234","3456"]))

But I'm not getting the expected results.

Correct me If I missed anything.

Answer 1

One question that you need to answer is: user_id is your DynamoDB Hash/Partition Key? If it is, then the operation that you are looking for is: BatchGetItem. You can see how it works here .

If user_id is not your Partition/Hash Key, a first (and wrong) solution would be to scan the entire table and filter its data (a very expensive method that should be avoided at all costs). A second, more efficient solution would be to create a global index (GSI) using user_id as Hash/Partition Key and project the data to be returned in the index. You can learn more about GSI's here .