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MidLevelScanOnly.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 System.Linq; using Amazon.DynamoDBv2; using Amazon.DynamoDBv2.DocumentModel; namespace com.amazonaws.codesamples { class MidLevelScanOnly { private static AmazonDynamoDBClient client = new AmazonDynamoDBClient(); static void Main(string[] args) { Table productCatalogTable = Table.LoadTable(client, "ProductCatalog"); // Scan example. FindProductsWithNegativePrice(productCatalogTable); FindProductsWithNegativePriceWithConfig(productCatalogTable); Console.WriteLine("To continue, press Enter"); Console.ReadLine(); } private static void FindProductsWithNegativePrice(Table productCatalogTable) { // Assume there is a price error. So we scan to find items priced < 0. ScanFilter scanFilter = new ScanFilter(); scanFilter.AddCondition("Price", ScanOperator.LessThan, 0); Search search = productCatalogTable.Scan(scanFilter); List<Document> documentList = new List<Document>(); do { documentList = search.GetNextSet(); Console.WriteLine("\nFindProductsWithNegativePrice: printing ............"); foreach (var document in documentList) PrintDocument(document); } while (!search.IsDone); } private static void FindProductsWithNegativePriceWithConfig(Table productCatalogTable) { // Assume there is a price error. So we scan to find items priced < 0. ScanFilter scanFilter = new ScanFilter(); scanFilter.AddCondition("Price", ScanOperator.LessThan, 0); ScanOperationConfig config = new ScanOperationConfig() { Filter = scanFilter, Select = SelectValues.SpecificAttributes, AttributesToGet = new List<string> { "Title", "Id" } }; Search search = productCatalogTable.Scan(config); List<Document> documentList = new List<Document>(); do { documentList = search.GetNextSet(); Console.WriteLine("\nFindProductsWithNegativePriceWithConfig: printing ............"); foreach (var document in documentList) PrintDocument(document); } while (!search.IsDone); } private static void PrintDocument(Document document) { // count++; Console.WriteLine(); foreach (var attribute in document.GetAttributeNames()) { string stringValue = null; var value = document[attribute]; if (value is Primitive) stringValue = value.AsPrimitive().Value.ToString(); else if (value is PrimitiveList) stringValue = string.Join(",", (from primitive in value.AsPrimitiveList().Entries select primitive.Value).ToArray()); Console.WriteLine("{0} - {1}", attribute, stringValue); } } }

Sample Details

Service: dynamodb

Last tested:

Author: AWS

Type: full-example

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