Batch Read in DynamoDB Using Java (Guide w/ Code Examples)

To perform a batch GetItem request in DynamoDB, you can use the AmazonDynamoDB#batchGetItem method. This method allows you to retrieve multiple items from one or more tables in a single request.

AmazonDynamoDB client = AmazonDynamoDBClientBuilder.standard().build();

Map<String, KeysAndAttributes> requestItems = new HashMap<>();

// Add a map entry for each table from which you want to retrieve items
KeysAndAttributes keysAndAttributes = new KeysAndAttributes();

// Add a list of primary key attribute values for the items you want to retrieve
keysAndAttributes.setKeys(
    Arrays.asList(
        new PrimaryKey("PK", 1),
        new PrimaryKey("PK", 2)
    )
);

// Add optional attributes to retrieve for each item
keysAndAttributes.setAttributesToGet(Arrays.asList("attr1", "attr2"));

requestItems.put("myTable", keysAndAttributes);

BatchGetItemRequest request = new BatchGetItemRequest()
    .withRequestItems(requestItems);

BatchGetItemResult result = client.batchGetItem(request);