Updating an item in the DynamoDB table using the AWS SDK for Java

Let's understand how to update an item from the DynamoDB table using the AWS SDK for Java.

Getting ready

To perform this operation, you can use the IDE of your choice.

How to do it…

Let's try to understand how to update a stored item in the DynamoDB table using Java. The update request allows us to add a new attribute to the item, update the value of an attribute, or remove an attribute from the item:

1. Create an instance of the DynamoDB class and initialize it with credentials:

   AmazonDynamoDBClient client = new AmazonDynamoDBClient(new ProfileCredentialsProvider());
   client.setRegion(Region.getRegion(Regions.US_EAST_1));
   DynamoDB dynamoDB = new DynamoDB(client);

2. Get the table by specifying the name:

   Table table = dynamoDB.getTable("productTable");

3. Create a map of ExpressionAttributeValues in which you need to specify the attributes that you wish to update:

   Map<String, String> expressionAttributeNames = new HashMap<String, String...