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

Inspecting the SQL API queries that LINQ generates

Now we will establish a breakpoint in one of the methods that builds a LINQ query against the Cosmos DB database to inspect the SQL API query that LINQ generates. This way, we will be able to grab the SQL queries and run them in our favorite tool to query the document collection. In addition, we will learn how to add the necessary code to print the generated SQL query in the debug output whenever necessary.

Go to the following line within the GetCompetitionByTitleWithLinq static method:

while (documentQuery.HasMoreResults) 

Right-click on the line and select Breakpoint | Insert breakpoint in the context menu.

Start debugging the application.


Inspect the value for documentQuery and Visual Studio will display a JSON key-value pair with the generated SQL API query string in the value for the "query" key, as shown in the following screenshot:

We can add the following line to display the query key and its value to the debug output: