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 and updating anattachment's metadata


You will write two new methods to the Program class: the first method will retrieve the metadata information for a given attachment based on its key, the second method will update the metadata information for an attachment.

  1. Start Visual Studio and open the RavenDB_Ch06 solution.

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

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

What just happened?

We just retrieved the metadata information for the attachment with the ID as flag/1098 and updated them.

To retrieve the attachment metadata you call the HeadAttachment() method and specify the attachment key. This method returns the attachment header through which you can get its field values (line 65).

To update the metadata you called the UpdateAttachmentMetadata() method and provided the new metadata values (lines 73 to 79).

Have a go hero – updating and deleting attachments

Write two new methods to the Program class to update and delete an...