Creazione di tabelle di esempio e caricamento di dati utilizzando AWS SDK for .NET

Il seguente esempio di codice C# consente di creare le tabelle e caricare i dati nelle tabelle. Per step-by-step istruzioni su come eseguire questo codice in Visual Studio, consulta. . NETesempi di codice

using System;
using System.Collections.Generic;
using Amazon.DynamoDBv2;
using Amazon.DynamoDBv2.DocumentModel;
using Amazon.DynamoDBv2.Model;
using Amazon.Runtime;
using Amazon.SecurityToken;

namespace com.amazonaws.codesamples
{
    class CreateTablesLoadData
    {
        private static AmazonDynamoDBClient client = new AmazonDynamoDBClient();

        static void Main(string[] args)
        {
            try
            {
                //DeleteAllTables(client);
                DeleteTable("ProductCatalog");
                DeleteTable("Forum");
                DeleteTable("Thread");
                DeleteTable("Reply");

                // Create tables (using the AWS SDK for .NET low-level API).
                CreateTableProductCatalog();
                CreateTableForum();
                CreateTableThread(); // ForumTitle, Subject */
                CreateTableReply();

                // Load data (using the .NET SDK document API)
                LoadSampleProducts();
                LoadSampleForums();
                LoadSampleThreads();
                LoadSampleReplies();
                Console.WriteLine("Sample complete!");
                Console.WriteLine("Press ENTER to continue");
                Console.ReadLine();
            }
            catch (AmazonServiceException e) { Console.WriteLine(e.Message); }
            catch (Exception e) { Console.WriteLine(e.Message); }
        }

        private static void DeleteTable(string tableName)
        {
            try
            {
                var deleteTableResponse = client.DeleteTable(new DeleteTableRequest()
                {
                    TableName = tableName
                });
                WaitTillTableDeleted(client, tableName, deleteTableResponse);
            }
            catch (ResourceNotFoundException)
            {
                // There is no such table.
            }
        }

        private static void CreateTableProductCatalog()
        {
            string tableName = "ProductCatalog";

            var response = client.CreateTable(new CreateTableRequest
            {
                TableName = tableName,
                AttributeDefinitions = new List<AttributeDefinition>()
                              {
                                  new AttributeDefinition
                                  {
                                      AttributeName = "Id",
                                      AttributeType = "N"
                                  }
                              },
                KeySchema = new List<KeySchemaElement>()
                              {
                                  new KeySchemaElement
                                  {
                                      AttributeName = "Id",
                                      KeyType = "HASH"
                                  }
                              },
                ProvisionedThroughput = new ProvisionedThroughput
                {
                    ReadCapacityUnits = 10,
                    WriteCapacityUnits = 5
                }
            });

            WaitTillTableCreated(client, tableName, response);
        }

        private static void CreateTableForum()
        {
            string tableName = "Forum";

            var response = client.CreateTable(new CreateTableRequest
            {
                TableName = tableName,
                AttributeDefinitions = new List<AttributeDefinition>()
                              {
                                  new AttributeDefinition
                                  {
                                      AttributeName = "Name",
                                      AttributeType = "S"
                                  }
                              },
                KeySchema = new List<KeySchemaElement>()
                              {
                                  new KeySchemaElement
                                  {
                                      AttributeName = "Name", // forum Title
                                      KeyType = "HASH"
                                  }
                              },
                ProvisionedThroughput = new ProvisionedThroughput
                {
                    ReadCapacityUnits = 10,
                    WriteCapacityUnits = 5
                }
            });

            WaitTillTableCreated(client, tableName, response);
        }

        private static void CreateTableThread()
        {
            string tableName = "Thread";

            var response = client.CreateTable(new CreateTableRequest
            {
                TableName = tableName,
                AttributeDefinitions = new List<AttributeDefinition>()
                              {
                                  new AttributeDefinition
                                  {
                                      AttributeName = "ForumName", // Hash attribute
                                      AttributeType = "S"
                                  },
                                  new AttributeDefinition
                                  {
                                      AttributeName = "Subject",
                                      AttributeType = "S"
                                  }
                              },
                KeySchema = new List<KeySchemaElement>()
                              {
                                  new KeySchemaElement
                                  {
                                      AttributeName = "ForumName", // Hash attribute
                                      KeyType = "HASH"
                                  },
                                  new KeySchemaElement
                                  {
                                      AttributeName = "Subject", // Range attribute
                                      KeyType = "RANGE"
                                  }
                              },
                ProvisionedThroughput = new ProvisionedThroughput
                {
                    ReadCapacityUnits = 10,
                    WriteCapacityUnits = 5
                }
            });

            WaitTillTableCreated(client, tableName, response);
        }

        private static void CreateTableReply()
        {
            string tableName = "Reply";
            var response = client.CreateTable(new CreateTableRequest
            {
                TableName = tableName,
                AttributeDefinitions = new List<AttributeDefinition>()
                              {
                                  new AttributeDefinition
                                  {
                                      AttributeName = "Id",
                                      AttributeType = "S"
                                  },
                                  new AttributeDefinition
                                  {
                                      AttributeName = "ReplyDateTime",
                                      AttributeType = "S"
                                  },
                                  new AttributeDefinition
                                  {
                                      AttributeName = "PostedBy",
                                      AttributeType = "S"
                                  }
                              },
                KeySchema = new List<KeySchemaElement>()
                              {
                                  new KeySchemaElement()
                                  {
                                      AttributeName = "Id",
                                      KeyType = "HASH"
                                  },
                                  new KeySchemaElement()
                                  {
                                      AttributeName = "ReplyDateTime",
                                      KeyType = "RANGE"
                                  }
                              },
                LocalSecondaryIndexes = new List<LocalSecondaryIndex>()
                              {
                                  new LocalSecondaryIndex()
                                  {
                                      IndexName = "PostedBy_index",


                                      KeySchema = new List<KeySchemaElement>() {
                                          new KeySchemaElement() {
                                              AttributeName = "Id", KeyType = "HASH"
                                          },
                                          new KeySchemaElement() {
                                              AttributeName = "PostedBy", KeyType = "RANGE"
                                          }
                                      },
                                      Projection = new Projection() {
                                          ProjectionType = ProjectionType.KEYS_ONLY
                                      }
                                  }
                              },
                ProvisionedThroughput = new ProvisionedThroughput
                {
                    ReadCapacityUnits = 10,
                    WriteCapacityUnits = 5
                }
            });

            WaitTillTableCreated(client, tableName, response);
        }

        private static void WaitTillTableCreated(AmazonDynamoDBClient client, string tableName,
                             CreateTableResponse response)
        {
            var tableDescription = response.TableDescription;

            string status = tableDescription.TableStatus;

            Console.WriteLine(tableName + " - " + status);

            // Let us wait until table is created. Call DescribeTable.
            while (status != "ACTIVE")
            {
                System.Threading.Thread.Sleep(5000); // Wait 5 seconds.
                try
                {
                    var res = client.DescribeTable(new DescribeTableRequest
                    {
                        TableName = tableName
                    });
                    Console.WriteLine("Table name: {0}, status: {1}", res.Table.TableName,
                              res.Table.TableStatus);
                    status = res.Table.TableStatus;
                }
                // Try-catch to handle potential eventual-consistency issue.
                catch (ResourceNotFoundException)
                { }
            }
        }

        private static void WaitTillTableDeleted(AmazonDynamoDBClient client, string tableName,
                             DeleteTableResponse response)
        {
            var tableDescription = response.TableDescription;

            string status = tableDescription.TableStatus;

            Console.WriteLine(tableName + " - " + status);

            // Let us wait until table is created. Call DescribeTable
            try
            {
                while (status == "DELETING")
                {
                    System.Threading.Thread.Sleep(5000); // wait 5 seconds

                    var res = client.DescribeTable(new DescribeTableRequest
                    {
                        TableName = tableName
                    });
                    Console.WriteLine("Table name: {0}, status: {1}", res.Table.TableName,
                              res.Table.TableStatus);
                    status = res.Table.TableStatus;
                }
            }
            catch (ResourceNotFoundException)
            {
                // Table deleted.
            }
        }

        private static void LoadSampleProducts()
        {
            Table productCatalogTable = Table.LoadTable(client, "ProductCatalog");
            // ********** Add Books *********************
            var book1 = new Document();
            book1["Id"] = 101;
            book1["Title"] = "Book 101 Title";
            book1["ISBN"] = "111-1111111111";
            book1["Authors"] = new List<string> { "Author 1" };
            book1["Price"] = -2; // *** Intentional value. Later used to illustrate scan.
            book1["Dimensions"] = "8.5 x 11.0 x 0.5";
            book1["PageCount"] = 500;
            book1["InPublication"] = true;
            book1["ProductCategory"] = "Book";
            productCatalogTable.PutItem(book1);

            var book2 = new Document();

            book2["Id"] = 102;
            book2["Title"] = "Book 102 Title";
            book2["ISBN"] = "222-2222222222";
            book2["Authors"] = new List<string> { "Author 1", "Author 2" }; ;
            book2["Price"] = 20;
            book2["Dimensions"] = "8.5 x 11.0 x 0.8";
            book2["PageCount"] = 600;
            book2["InPublication"] = true;
            book2["ProductCategory"] = "Book";
            productCatalogTable.PutItem(book2);

            var book3 = new Document();
            book3["Id"] = 103;
            book3["Title"] = "Book 103 Title";
            book3["ISBN"] = "333-3333333333";
            book3["Authors"] = new List<string> { "Author 1", "Author2", "Author 3" }; ;
            book3["Price"] = 2000;
            book3["Dimensions"] = "8.5 x 11.0 x 1.5";
            book3["PageCount"] = 700;
            book3["InPublication"] = false;
            book3["ProductCategory"] = "Book";
            productCatalogTable.PutItem(book3);

            // ************ Add bikes. *******************
            var bicycle1 = new Document();
            bicycle1["Id"] = 201;
            bicycle1["Title"] = "18-Bike 201"; // size, followed by some title.
            bicycle1["Description"] = "201 description";
            bicycle1["BicycleType"] = "Road";
            bicycle1["Brand"] = "Brand-Company A"; // Trek, Specialized.
            bicycle1["Price"] = 100;
            bicycle1["Color"] = new List<string> { "Red", "Black" };
            bicycle1["ProductCategory"] = "Bike";
            productCatalogTable.PutItem(bicycle1);

            var bicycle2 = new Document();
            bicycle2["Id"] = 202;
            bicycle2["Title"] = "21-Bike 202Brand-Company A";
            bicycle2["Description"] = "202 description";
            bicycle2["BicycleType"] = "Road";
            bicycle2["Brand"] = "";
            bicycle2["Price"] = 200;
            bicycle2["Color"] = new List<string> { "Green", "Black" };
            bicycle2["ProductCategory"] = "Bicycle";
            productCatalogTable.PutItem(bicycle2);

            var bicycle3 = new Document();
            bicycle3["Id"] = 203;
            bicycle3["Title"] = "19-Bike 203";
            bicycle3["Description"] = "203 description";
            bicycle3["BicycleType"] = "Road";
            bicycle3["Brand"] = "Brand-Company B";
            bicycle3["Price"] = 300;
            bicycle3["Color"] = new List<string> { "Red", "Green", "Black" };
            bicycle3["ProductCategory"] = "Bike";
            productCatalogTable.PutItem(bicycle3);

            var bicycle4 = new Document();
            bicycle4["Id"] = 204;
            bicycle4["Title"] = "18-Bike 204";
            bicycle4["Description"] = "204 description";
            bicycle4["BicycleType"] = "Mountain";
            bicycle4["Brand"] = "Brand-Company B";
            bicycle4["Price"] = 400;
            bicycle4["Color"] = new List<string> { "Red" };
            bicycle4["ProductCategory"] = "Bike";
            productCatalogTable.PutItem(bicycle4);

            var bicycle5 = new Document();
            bicycle5["Id"] = 205;
            bicycle5["Title"] = "20-Title 205";
            bicycle4["Description"] = "205 description";
            bicycle5["BicycleType"] = "Hybrid";
            bicycle5["Brand"] = "Brand-Company C";
            bicycle5["Price"] = 500;
            bicycle5["Color"] = new List<string> { "Red", "Black" };
            bicycle5["ProductCategory"] = "Bike";
            productCatalogTable.PutItem(bicycle5);
        }

        private static void LoadSampleForums()
        {
            Table forumTable = Table.LoadTable(client, "Forum");

            var forum1 = new Document();
            forum1["Name"] = "Amazon DynamoDB"; // PK
            forum1["Category"] = "Amazon Web Services";
            forum1["Threads"] = 2;
            forum1["Messages"] = 4;
            forum1["Views"] = 1000;

            forumTable.PutItem(forum1);

            var forum2 = new Document();
            forum2["Name"] = "Amazon S3"; // PK
            forum2["Category"] = "Amazon Web Services";
            forum2["Threads"] = 1;

            forumTable.PutItem(forum2);
        }

        private static void LoadSampleThreads()
        {
            Table threadTable = Table.LoadTable(client, "Thread");

            // Thread 1.
            var thread1 = new Document();
            thread1["ForumName"] = "Amazon DynamoDB"; // Hash attribute.
            thread1["Subject"] = "DynamoDB Thread 1"; // Range attribute.
            thread1["Message"] = "DynamoDB thread 1 message text";
            thread1["LastPostedBy"] = "User A";
            thread1["LastPostedDateTime"] = DateTime.UtcNow.Subtract(new TimeSpan(14, 0, 0, 0));
            thread1["Views"] = 0;
            thread1["Replies"] = 0;
            thread1["Answered"] = false;
            thread1["Tags"] = new List<string> { "index", "primarykey", "table" };

            threadTable.PutItem(thread1);

            // Thread 2.
            var thread2 = new Document();
            thread2["ForumName"] = "Amazon DynamoDB"; // Hash attribute.
            thread2["Subject"] = "DynamoDB Thread 2"; // Range attribute.
            thread2["Message"] = "DynamoDB thread 2 message text";
            thread2["LastPostedBy"] = "User A";
            thread2["LastPostedDateTime"] = DateTime.UtcNow.Subtract(new TimeSpan(21, 0, 0, 0));
            thread2["Views"] = 0;
            thread2["Replies"] = 0;
            thread2["Answered"] = false;
            thread2["Tags"] = new List<string> { "index", "primarykey", "rangekey" };

            threadTable.PutItem(thread2);

            // Thread 3.
            var thread3 = new Document();
            thread3["ForumName"] = "Amazon S3"; // Hash attribute.
            thread3["Subject"] = "S3 Thread 1"; // Range attribute.
            thread3["Message"] = "S3 thread 3 message text";
            thread3["LastPostedBy"] = "User A";
            thread3["LastPostedDateTime"] = DateTime.UtcNow.Subtract(new TimeSpan(7, 0, 0, 0));
            thread3["Views"] = 0;
            thread3["Replies"] = 0;
            thread3["Answered"] = false;
            thread3["Tags"] = new List<string> { "largeobjects", "multipart upload" };
            threadTable.PutItem(thread3);
        }

        private static void LoadSampleReplies()
        {
            Table replyTable = Table.LoadTable(client, "Reply");

            // Reply 1 - thread 1.
            var thread1Reply1 = new Document();
            thread1Reply1["Id"] = "Amazon DynamoDB#DynamoDB Thread 1"; // Hash attribute.
            thread1Reply1["ReplyDateTime"] = DateTime.UtcNow.Subtract(new TimeSpan(21, 0, 0, 0)); // Range attribute.
            thread1Reply1["Message"] = "DynamoDB Thread 1 Reply 1 text";
            thread1Reply1["PostedBy"] = "User A";

            replyTable.PutItem(thread1Reply1);

            // Reply 2 - thread 1.
            var thread1reply2 = new Document();
            thread1reply2["Id"] = "Amazon DynamoDB#DynamoDB Thread 1"; // Hash attribute.
            thread1reply2["ReplyDateTime"] = DateTime.UtcNow.Subtract(new TimeSpan(14, 0, 0, 0)); // Range attribute.
            thread1reply2["Message"] = "DynamoDB Thread 1 Reply 2 text";
            thread1reply2["PostedBy"] = "User B";

            replyTable.PutItem(thread1reply2);

            // Reply 3 - thread 1.
            var thread1Reply3 = new Document();
            thread1Reply3["Id"] = "Amazon DynamoDB#DynamoDB Thread 1"; // Hash attribute.
            thread1Reply3["ReplyDateTime"] = DateTime.UtcNow.Subtract(new TimeSpan(7, 0, 0, 0)); // Range attribute.
            thread1Reply3["Message"] = "DynamoDB Thread 1 Reply 3 text";
            thread1Reply3["PostedBy"] = "User B";

            replyTable.PutItem(thread1Reply3);

            // Reply 1 - thread 2.
            var thread2Reply1 = new Document();
            thread2Reply1["Id"] = "Amazon DynamoDB#DynamoDB Thread 2"; // Hash attribute.
            thread2Reply1["ReplyDateTime"] = DateTime.UtcNow.Subtract(new TimeSpan(7, 0, 0, 0)); // Range attribute.
            thread2Reply1["Message"] = "DynamoDB Thread 2 Reply 1 text";
            thread2Reply1["PostedBy"] = "User A";


            replyTable.PutItem(thread2Reply1);

            // Reply 2 - thread 2.
            var thread2Reply2 = new Document();
            thread2Reply2["Id"] = "Amazon DynamoDB#DynamoDB Thread 2"; // Hash attribute.
            thread2Reply2["ReplyDateTime"] = DateTime.UtcNow.Subtract(new TimeSpan(1, 0, 0, 0)); // Range attribute.
            thread2Reply2["Message"] = "DynamoDB Thread 2 Reply 2 text";
            thread2Reply2["PostedBy"] = "User A";

            replyTable.PutItem(thread2Reply2);
        }
    }
}