有没有办法在 DynamoDB 查询中获得特定范围的结果？

Question

I am querying a DynamoDB table with table.query() . I found that a FilterExpression can filter the results further, but I can't seem to find a way to simply filter a range of the results.

What I mean is that if the table has say 100 items, and the query matches 20 of them, is there a way to get say items 11-15 from those 20?

Thanks in advance!

Answer 1

Yes, both in Query/Scan you can set batch limit(Number of items to want to read).

QueryRequest queryRequest = new QueryRequest()
                .withTableName(TABLE_NAME)
                .withKeyConditionExpression("query_condition")
                .withIndexName("index_name") // If you have any
                .withExpressionAttributeValues("Expression_values")
                .withScanIndexForward(false) // To sort the results, only supported in Query. Not in Scan
                .withLimit(LIMIT) // Batch Size/Limit
                .withExclusiveStartKey(lastKeys); // Set the LastEvaluatedKey, if not it can NULL
            
QueryResult result = ddb.query(queryRequest);
Map<String, AttributeValue> lastKeys = result.getLastEvaluatedKey(); // You can pass these keys in your next call