Querying items from the DynamoDB table using the object persistence model in Java

Now, we are going to see how to query items from the table using the object persistence model.

Getting ready

To perform this recipe, you should have set up the project, as described in the earlier recipes, specifically, pom.xml, dependencies, and the object model.

How to do it…

Let's query items from the table using the object persistence model:

1. Create an instance of the DynamoDB client class and initiate it with the credential's profile. You can also set the region if you have created the table in a specific region:

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

2. Create an instance of the DynamoDBMapper class and initiate it with the client that we created earlier:

   DynamoDBMapper mapper = new DynamoDBMapper(client);

3. To query the item, we first need to create query expressions and key conditions, as shown in the following...