Java Lambda for Pagination scan for dynamodb

Question

so I'm trying to scan a dynamodb table using lastkeyevaluated, limit and filterexpression. I also want to take the returned lastevaluatedkey, filterexpression and limit from one dynamodb and add it to a new dynamodb table. This is my code right now

package dev.example;
 
 import com.amazonaws.services.dynamodbv2.AmazonDynamoDB;
 import com.amazonaws.services.dynamodbv2.AmazonDynamoDBClientBuilder;
 import com.amazonaws.services.dynamodbv2.document.DynamoDB;
 import com.amazonaws.services.dynamodbv2.model.AttributeValue;
 import com.amazonaws.services.dynamodbv2.model.ScanRequest;
 import com.amazonaws.services.dynamodbv2.model.ScanResult;
 
 import java.util.Map;
 
 public class ScanTable {
     static AmazonDynamoDB client = AmazonDynamoDBClientBuilder.standard().build();
     //static DynamoDB dynamoDB = new DynamoDB(client);
     
     public static void scan()
     {
         Map<String, AttributeValue> lastKeyEvaluated = null;
         String status = "open";
         do {
             ScanRequest scanRequest = new ScanRequest()
                     .withTableName("tablename")
                     .withLimit(10)
                     .withExclusiveStartKey(lastKeyEvaluated)
                     .withFilterExpression(status);
 
             ScanResult result = client.scan(scanRequest);
             for (Map<String, AttributeValue> item : result.getItems()){
                 System.out.println(item);
                
             }
             lastKeyEvaluated = result.getLastEvaluatedKey();
         } while (lastKeyEvaluated == null);
     }
     public static void main(String[] args) throws Exception {
         scan();
     }
 }

I'm not sure how to do that.

Answer 1

1. For Scanning the table take a look at these docs . This shows how to set the Limit, FilterExpression and how to paginate.

2. For adding the returned values, take a look at these docs which show you how to do a PutItem request to save the values to a new table.