AWS Code Sample
Catalog

LowLevelBatchWrite.cs

/** * Copyright 2010-2019 Amazon.com, Inc. or its affiliates. All Rights Reserved. * * This file is licensed under the Apache License, Version 2.0 (the "License"). * You may not use this file except in compliance with the License. A copy of * the License is located at * * http://aws.amazon.com/apache2.0/ * * This file is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR * CONDITIONS OF ANY KIND, either express or implied. See the License for the * specific language governing permissions and limitations under the License. */ using System; using System.Collections.Generic; using Amazon.DynamoDBv2; using Amazon.DynamoDBv2.Model; using Amazon.Runtime; namespace com.amazonaws.codesamples { class LowLevelBatchWrite { private static string table1Name = "Forum"; private static string table2Name = "Thread"; private static AmazonDynamoDBClient client = new AmazonDynamoDBClient(); static void Main(string[] args) { try { TestBatchWrite(); } catch (AmazonServiceException e) { Console.WriteLine(e.Message); } catch (Exception e) { Console.WriteLine(e.Message); } Console.WriteLine("To continue, press Enter"); Console.ReadLine(); } private static void TestBatchWrite() { var request = new BatchWriteItemRequest { ReturnConsumedCapacity = "TOTAL", RequestItems = new Dictionary<string, List<WriteRequest>> { { table1Name, new List<WriteRequest> { new WriteRequest { PutRequest = new PutRequest { Item = new Dictionary<string, AttributeValue> { { "Name", new AttributeValue { S = "S3 forum" } }, { "Threads", new AttributeValue { N = "0" }} } } } } }, { table2Name, new List<WriteRequest> { new WriteRequest { PutRequest = new PutRequest { Item = new Dictionary<string, AttributeValue> { { "ForumName", new AttributeValue { S = "S3 forum" } }, { "Subject", new AttributeValue { S = "My sample question" } }, { "Message", new AttributeValue { S = "Message Text." } }, { "KeywordTags", new AttributeValue { SS = new List<string> { "S3", "Bucket" } } } } } }, new WriteRequest { // For the operation to delete an item, if you provide a primary key value // that does not exist in the table, there is no error, it is just a no-op. DeleteRequest = new DeleteRequest { Key = new Dictionary<string, AttributeValue>() { { "ForumName", new AttributeValue { S = "Some partition key value" } }, { "Subject", new AttributeValue { S = "Some sort key value" } } } } } } } } }; CallBatchWriteTillCompletion(request); } private static void CallBatchWriteTillCompletion(BatchWriteItemRequest request) { BatchWriteItemResponse response; int callCount = 0; do { Console.WriteLine("Making request"); response = client.BatchWriteItem(request); callCount++; // Check the response. var tableConsumedCapacities = response.ConsumedCapacity; var unprocessed = response.UnprocessedItems; Console.WriteLine("Per-table consumed capacity"); foreach (var tableConsumedCapacity in tableConsumedCapacities) { Console.WriteLine("{0} - {1}", tableConsumedCapacity.TableName, tableConsumedCapacity.CapacityUnits); } Console.WriteLine("Unprocessed"); foreach (var unp in unprocessed) { Console.WriteLine("{0} - {1}", unp.Key, unp.Value.Count); } Console.WriteLine(); // For the next iteration, the request will have unprocessed items. request.RequestItems = unprocessed; } while (response.UnprocessedItems.Count > 0); Console.WriteLine("Total # of batch write API calls made: {0}", callCount); } } }

Sample Details

Service: dynamodb

Last tested:

Author: AWS

Type: full-example

On this page: