Book Image

Guide to NoSQL with Azure Cosmos DB

By : Gaston C. Hillar, Daron Yöndem
Book Image

Guide to NoSQL with Azure Cosmos DB

By: Gaston C. Hillar, Daron Yöndem

Overview of this book

Cosmos DB is a NoSQL database service included in Azure that is continuously adding new features and has quickly become one of the most innovative services found in Azure, targeting mission-critical applications at a global scale. This book starts off by showing you the main features of Cosmos DB, their supported NoSQL data models and the foundations of its scalable and distributed architecture. You will learn to work with the latest available tools that simplify your tasks with Cosmos DB and reduce development costs, such as the Data Explorer in the Azure portal, Microsoft Azure Storage Explorer, and the Cosmos DB Emulator. Next, move on to working with databases and document collections. We will use the tools to run schema agnostic queries against collections with the Cosmos DB SQL dialect and understand their results. Then, we will create a first version of an application that uses the latest .NET Core SDK to interact with Cosmos DB. Next, we will create a second version of the application that will take advantage of important features that the combination of C# and the .NET Core SDK provides, such as POCOs and LINQ queries. By the end of the book, you will be able to build an application that works with a Cosmos DB NoSQL document database with C#, the .NET Core SDK, LINQ, and JSON.
Table of Contents (13 chapters)
Title Page
Packt Upsell

Understanding query results in JSON arrays

The following lines show one of the simplest queries that we can run against the previously created VideoGames1 collection and retrieves the document whose id is equal to 2. The code file for the sample is included in the learning_cosmos_db_03_01 folder in the sql_queries/videogame_1_01.sql file:

FROM Videogames v 
WHERE = '2' 

In the Azure portal, make sure you are in the page for the Cosmos DB account in the portal. Click on the Data Explorer option, click on the database name (Competition) to expand the collections for the database, and click on the collection name (VideoGames1). Click on New SQL Query in the toolbar located at the top of the panel and the portal will add a new query tab with a default query at the top: SELECT * FROM c. Select this text, paste the new text for the query, and click Execute Query. Cosmos DB will execute the query and the portal will display the JSON document with the results in the Results tab, as...