DocumentDB - 创建集合

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在本章中，我们将学习如何创建集合。这与创建数据库类似。您可以从门户或使用 .Net SDK 的代码创建集合。

步骤 1 - 转到 Azure 门户上的主仪表板。

步骤 2 - 从数据库列表中选择 myfirstdb。

步骤 3 - 单击“添加集合”选项并指定集合 ID。选择不同选项的定价层。

步骤 4 - 让我们选择 S1 Standard 并单击 Select → OK 按钮。

如您所见，MyCollection 已添加到 myfirstdb 中。

您还可以使用 .Net SDK 从代码创建集合。让我们看一下从代码中添加集合的以下步骤。

步骤 1 - 在 Visual Studio 中打开控制台应用程序。

步骤 2 - 要创建集合，首先在 CreateDocumentClient 任务中通过 ID 检索 myfirstdb 数据库。

private static async Task CreateDocumentClient() {

   // Create a new instance of the DocumentClient
   using (var client = new DocumentClient(new Uri(EndpointUrl), AuthorizationKey)) {
      database = client.CreateDatabaseQuery("SELECT * FROM c WHERE c.id =
         'myfirstdb'").AsEnumerable().First();
			
      await CreateCollection(client, "MyCollection1");
      await CreateCollection(client, "MyCollection2", "S2"); 
   }
}

以下是 CreateCollection 任务的实现。

private async static Task CreateCollection(DocumentClient client, string collectionId,
   string offerType = "S1") {
	
   Console.WriteLine();
   Console.WriteLine("**** Create Collection {0} in {1} ****", collectionId, database.Id);
	
   var collectionDefinition = new DocumentCollection { Id = collectionId };
   var options = new RequestOptions { OfferType = offerType };
   var result = await client.CreateDocumentCollectionAsync(database.SelfLink,
      collectionDefinition, options);
   var collection = result.Resource;
	
   Console.WriteLine("Created new collection");
   ViewCollection(collection);
}

我们创建一个新的 DocumentCollection 对象，该对象使用 CreateDocumentCollectionAsync 方法所需的 Id 定义新集合，该方法还接受一个选项参数，我们在此处使用该参数来设置新集合的性能层（我们将其称为 OfferType）。

默认为 S1，并且由于我们没有传入 OfferType，因此对于 MyCollection1，这将是一个 S1 集合，对于 MyCollection2，我们传递了 S2，这使得该集合成为 S2，如上所示。

以下是 ViewCollection 方法的实现。

private static void ViewCollection(DocumentCollection collection) {
   Console.WriteLine("Collection ID: {0} ", collection.Id); 
   Console.WriteLine("Resource ID: {0} ", collection.ResourceId); 
   Console.WriteLine("Self Link: {0} ", collection.SelfLink); 
   Console.WriteLine("Documents Link: {0} ", collection.DocumentsLink); 
   Console.WriteLine("UDFs Link: {0} ", collection.UserDefinedFunctionsLink); 
   Console.WriteLine(" StoredProcs Link: {0} ", collection.StoredProceduresLink); 
   Console.WriteLine("Triggers Link: {0} ", collection.TriggersLink); 
   Console.WriteLine("Timestamp: {0} ", collection.Timestamp);
}

以下是集合的program.cs 文件的完整实现。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using Microsoft.Azure.Documents;
using Microsoft.Azure.Documents.Client;
using Microsoft.Azure.Documents.Linq;

using Newtonsoft.Json;

namespace DocumentDBDemo {

   class Program {
	
      private const string EndpointUrl = "https://azuredocdbdemo.documents.azure.com:443/";
		
      private const string AuthorizationKey = "BBhjI0gxdVPdDbS4diTjdloJq7Fp4L5RO/
         StTt6UtEufDM78qM2CtBZWbyVwFPSJIm8AcfDu2O+AfV T+TYUnBQ==";
			
      private static Database database;
		
      static void Main(string[] args) {
         try {
            CreateDocumentClient().Wait();
         } catch (Exception e) {
            Exception baseException = e.GetBaseException();
            Console.WriteLine("Error: {0}, Message: {1}", e.Message, baseException.Message);
         }
         Console.ReadKey();
      }
		
      private static async Task CreateDocumentClient() {
         // Create a new instance of the DocumentClient
         using (var client = new DocumentClient(new Uri(EndpointUrl), AuthorizationKey)) {
            database = client.CreateDatabaseQuery("SELECT * FROM c WHERE c.id =
               'myfirstdb'").AsEnumerable().First();
            await CreateCollection(client, "MyCollection1");
            await CreateCollection(client, "MyCollection2", "S2");
				
            //await CreateDatabase(client);
            //GetDatabases(client);
            //await DeleteDatabase(client);
            //GetDatabases(client);
         }
      }
		
      private async static Task CreateCollection(DocumentClient client,
         string collectionId, string offerType = "S1") {
			
         Console.WriteLine();
         Console.WriteLine("**** Create Collection {0} in {1} ****", collectionId,
            database.Id);

         var collectionDefinition = new DocumentCollection { Id = collectionId };
         var options = new RequestOptions { OfferType = offerType };
         var result = await 
			
			client.CreateDocumentCollectionAsync(database.SelfLink,
            collectionDefinition, options);
         var collection = result.Resource;

         Console.WriteLine("Created new collection");
         ViewCollection(collection);
      }
		
      private static void ViewCollection(DocumentCollection collection) {
         Console.WriteLine("Collection ID: {0} ", collection.Id);
         Console.WriteLine("Resource ID: {0} ", collection.ResourceId);
         Console.WriteLine("Self Link: {0} ", collection.SelfLink);
         Console.WriteLine("Documents Link: {0} ", collection.DocumentsLink);
         Console.WriteLine("UDFs Link: {0} ", collection.UserDefinedFunctionsLink);
         Console.WriteLine("StoredProcs Link: {0} ", collection.StoredProceduresLink);
         Console.WriteLine("Triggers Link: {0} ", collection.TriggersLink);
         Console.WriteLine("Timestamp: {0} ", collection.Timestamp);
      }
		
   }
}

当上面的代码被编译并执行时，您将收到以下输出，其中包含与集合相关的所有信息。

**** Create Collection MyCollection1 in myfirstdb **** 
Created new collection
   Collection ID: MyCollection1
      Resource ID: Ic8LAPPvnAA=
         Self Link: dbs/Ic8LAA==/colls/Ic8LAPPvnAA=/
   Documents Link: dbs/Ic8LAA==/colls/Ic8LAPPvnAA=/docs/
         UDFs Link: dbs/Ic8LAA==/colls/Ic8LAPPvnAA=/udfs/
   StoredProcs Link: dbs/Ic8LAA==/colls/Ic8LAPPvnAA=/sprocs/
      Triggers Link: dbs/Ic8LAA==/colls/Ic8LAPPvnAA=/triggers/
         Timestamp: 12/10/2015 4:55:36 PM
		  
**** Create Collection MyCollection2 in myfirstdb ****
Created new collection
   Collection ID: MyCollection2
      Resource ID: Ic8LAKGHDwE=
         Self Link: dbs/Ic8LAA==/colls/Ic8LAKGHDwE=/
   Documents Link: dbs/Ic8LAA==/colls/Ic8LAKGHDwE=/docs/
         UDFs Link: dbs/Ic8LAA==/colls/Ic8LAKGHDwE=/udfs/
   StoredProcs Link: dbs/Ic8LAA==/colls/Ic8LAKGHDwE=/sprocs/
      Triggers Link: dbs/Ic8LAA==/colls/Ic8LAKGHDwE=/triggers/
         Timestamp: 12/10/2015 4:55:38 PM