Book Image

RavenDB 2.x Beginner's Guide

By : Khaled Tannir
Book Image

RavenDB 2.x Beginner's Guide

By: Khaled Tannir

Overview of this book

RavenDB is a second generation document database written in .NET, offering a flexible data model designed to address requirements coming from real-world systems. It is different from the other document databases around, as with RavenDB you can get up and running in a few minutes, and that includes grasping all the basics. It allows you to build high-performance, low-latency applications with ease and efficiency.RavenDB 2.x Beginner's Guide introduces RavenDB concepts and teaches you everything, right from installing RavenDB, to creating documents, and querying indexes. This book will help you take advantage of powerful, document-oriented NoSQL databases and build a solid foundation on which you can create your .NET applications. This book presents RavenDB, the .NET document-oriented NoSQL database, through a series of clear and practical exercises that will help you to take advantage of this database server. The book starts off with an introduction to RavenDB and its Management Studio. You will then move ahead and learn how to quickly and efficiently build high performance, NoSQL document-oriented .NET applications using the .NET client API or the HTTP REST API. Next, Dynamic and static indexes that use map/reduce to process datasets are covered. You will then see how to create and query these indexes, with the help of detailed examples. You will also learn how to deploy your RavenDB server in a production environment and how to optimize and secure it.With numerous practical examples, RavenDB 2.x Beginner's Guide teaches you everything you need to know for building high performance .NET document-oriented NoSQL databases.
Table of Contents (21 chapters)
RavenDB 2.x Beginner's Guide
Credits
About the Author
Acknowledgments
About the Reviewers
www.PacktPub.com
Preface
Index

Time for action – retrieving stored attachments


We want to retrieve the flag image we stored early as an attachment. You will add a code snippet to the Main() method to retrieve the attachment.

  1. Start Visual Studio and open the RavenDB_Ch06 solution.

  2. Add the following snippet of code to the Main() method:

  3. Save all the files, build and run the solution.

  4. In Windows Explorer, switch to the RavenDB prompt window and look at the RavenDB logs.

What just happened?

We aim to retrieve the flag image file stored earlier as an attachment.

Within the Main() method you called the GetAttachment() method on the DatabaseCommands object and specified the attachment ID to retrieve, which in this case is flag/1098.

This method returns an Attachment object that contains all data and metadata used to store the attachment.

To retrieve the attachment RavenDB performs a GET command on the static endpoint using the attachment ID:

Have a go hero – retrieving country flag image attachment

Write a new method to retrieve the...