Batch Update Using DynamoDB Mapper (Guide w/ Code Examples)

DynamoDBMapper class, does not have a specific method for batch update like "batchUpdate" method. However, you can use the save method in a loop to update multiple items one by one. In this example, a list of items to update is defined, and the save method is called for each item in the list. The savemethod accepts an instance of the domain class object, and it works by checking the primary key value, if the primary key value is present in the item, the item will be updated, if not, a new item will be created.

import com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMapper;

import java.util.List;

public class BatchUpdateExample {

    public static void main(String[] args) {
        // Create a new DynamoDBMapper
        AmazonDynamoDB client = AmazonDynamoDBClientBuilder.standard().build();
        DynamoDBMapper mapper = new DynamoDBMapper(client);

        // Define a list of items to update
        List<Product> itemsToUpdate = new ArrayList<Product>();
        itemsToUpdate.add(new Product("111", "Updated Product 1", 50, 20));
        itemsToUpdate.add(new Product("222", "Updated Product 2", 100, 30));
        itemsToUpdate.add(new Product("333", "Updated Product 3", 150, 40));

        for (Product item : itemsToUpdate) {
            // Update the item
            mapper.save(item);
        }
    }
}