Get Multiple Items in DynamoDB Using Java (Guide w/ Code Examples)
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Provided by Rafal Wilinski
To retrieve multiple items from a DynamoDB table in a single operation in Java, you can use the batchGetItem
method of the AmazonDynamoDB
client. In this example, YourTableName
is the name of the table which you want to retrieve the items from.
The batchGetItem
method accepts a BatchGetItemRequest
object, which takes a map of the table name to KeysAndAttributes
objects. Each KeysAndAttributes
object represents the keys and attributes of the items that you want to retrieve.
import com.amazonaws.services.dynamodbv2.AmazonDynamoDB; import com.amazonaws.services.dynamodbv2.AmazonDynamoDBClientBuilder; import com.amazonaws.services.dynamodbv2.model.KeysAndAttributes; import com.amazonaws.services.dynamodbv2.model.batchGetItemRequest; import com.amazonaws.services.dynamodbv2.model.Attributevalue; import com.amazonaws.services.dynamodbv2.model.batchGetItemResult; public class DynamoDBBatchGetExample { public static void main(String[] args) { AmazonDynamoDB client = AmazonDynamoDBClientBuilder.defaultClient(); Map<String, KeysAndAttributes> requestItems = new HashMap<String, KeysAndAttributes>(); List<Map<String, AttributeValue>> keys = new ArrayList<Map<String, AttributeValue>>(); keys.add(new HashMap<String, AttributeValue>() { { put("id", new AttributeValue().withN("1")); } }); keys.add(new HashMap<String, AttributeValue>() { { put("id", new AttributeValue().withN("2")); } }); requestItems.put("YourTableName", new KeysAndAttributes().withKeys(keys)); BatchGetItemRequest request = new BatchGetItemRequest() .withRequestItems(requestItems); BatchGetItemResult result = client.batchGetItem(request); System.out.println("Items retrieved successfully!"); System.out.println(result.get()); } }
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