Simple CRUD Operations In Azure Cosmos DB

Introduction

• This article will help the beginners to perform CRUD operations on Cosmos DB database using C#.
• If you are new to Cosmos DB, then please refer Getting Started with Cosmos DB article.

• Create Solution and add NuGet Package

1. Create a new console app.
2. Right-click on Project -> Manage NuGet Package.
3. Search for ‘documentdb’ under the "Browse" tab.
4. Select Microsoft.Azure.DocumentDB package and click on Install.
   

• Add Config Settings
  Go to App Settings and add the following configuration.
  1. <appSettings>
  2. <!--Add Cosmos DB Endpoint URL-->
  3. <add key="DocDbEndpoint" value =""/>
  4. <!--Add Primary Key-->
  5. <add key="DocDbMasterKey" value =""/>
  6. </appSettings>

• How to get Endpoint URL and Master Key?
  1. Open the Azure portal.
  2. Go to the Cosmos DB account.
  3. Click on Keys.
  4. Copy the URI and Primary Key.
     
  5. URI = DocDbEndpoint
  6. Primary Key = DocDbMasterKey

• Initialize Document Client Instance
  1. Add a reference to Configuration;
  2. Add a reference to Microsoft.Azure.Documents.Client;
  3. Retrieve Endpoint URL and Primary Key
     1. using Microsoft.Azure.Documents;
     2. using Microsoft.Azure.Documents.Client;
     3. using System;
     4. using System.Configuration;
     5. using System.Linq;
     6. using System.Threading.Tasks;
     8. namespace CosmosDBCrudOperationd
     9. {
     10. class Program
     11. {
     12. static void Main(string[] args)
     13. {
     14. Task.Run(async () =>
     15. {
     16. var endpoint = ConfigurationManager.AppSettings["DocDbEndpoint"];
     17. var masterKey = ConfigurationManager.AppSettings["DocDbMasterKey"];
     18. using (var client = new DocumentClient(new Uri(endpoint), masterKey))
     19. {
     21. }
     23. }).Wait();
     24. }
     25. }
     26. }

• Create a New Cosmos DB Database
  1. Console.WriteLine("\r\n>>>>>>>>>>>>>>>> Creating Database <<<<<<<<<<<<<<<<<<<");
  2. // Create new database Object
  3. //Id defines name of the database
  4. var databaseDefinition = new Database { Id = "testDb" };
  5. var database = await client.CreateDatabaseIfNotExistsAsync(databaseDefinition);
  6. Console.WriteLine("Database testDb created successfully");

• Create a new database collection.
  A database is a container that holds the number of collections.
  To create a new collection, you need to give the path of the database under which you want to create the collection.
  Database path can be given in following format,
  dbo/{databaseName}
  1. //Create new database collection
  2. Console.WriteLine("\r\n>>>>>>>>>>>>>>>> Creating Collection <<<<<<<<<<<<<<<<<<<");
  3. var collectionDefinition = new DocumentCollection { Id = "testDocumentCollection" };
  4. var collection = await client.CreateDocumentCollectionIfNotExistsAsync("dbo/testDb",
  5. collectionDefinition);
  6. Console.WriteLine("Collection testDocumentCollection created successfully");

1. Database Link (path to database): dbo/testDb
2. Document Collection Object
   Alternatively, you can use UriFactory.CreateDatabaseUri(databaseName) method to create database URI for you.
   1. //Create new database collection
   2. Console.WriteLine("\r\n>>>>>>>>>>>>>>>> Creating Collection <<<<<<<<<<<<<<<<<<<");
   3. var collectionDefinition = new DocumentCollection { Id = "testDocumentCollection" };
   4. var collection = await client.CreateDocumentCollectionIfNotExistsAsync(UriFactory.CreateDatabaseUri("testDb"),
   5. collectionDefinition);
   6. Console.WriteLine("Collection testDocumentCollection created successfully");