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A .NET document database interface for relational databases, because in SQL we (still) trust !

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How does it work ?

YesSql is a .NET Core document database interface over relational databases which allows you to define documents and indexes using plain old CLR objects. The main difference with document databases is that it uses any RDBMS to store them, which gives you all the power of SQL databases like transactions, replication, reporting, ... But the main advantage might be that there is no magic involved, it's pure SQL !

A video about YesSql was recorded and is available here


Aren't NoSQL databases also about map/reduce ?

YesSql has support for it too. There is a sample project in the source code, and you'll see that map/reduce is fully supported by looking at the tests.

How is the database structured ?

There is a global [Document] table. Each index is a custom class which has its own table. A reduce index also adds a bridge table in order to map many documents. Internally YesSql communicates with the database server using Dapper.

Dude ! Why another document database ?

I know :/ Well actually I am a big fan of document databases and I am well aware that some like MongoDb and RavenDb are already top-notch ones, but what if you want a free, transactional .NET document database ?

  • MongoDb is not transactional, and some applications can't cope with it. RDBMS on the contrary are all transactional.
  • RavenDb (which I am a big fan of) is not free (for most usages).
  • Some companies which have invested a lot in SQL, only trust SQL, and have in-house experts.

So YesSql might be an answer for the developers who face those restrictions. If you don't care about those then please don't spend one more minute on YesSql, it's useless for you.

I am sold, where do I start ?

The documentation is here:

You can also take a look at the sample apps in the source code.


  • Development and pull-requests are done based on the main branch.
  • Every build and pull-request are tested againts Sqlite, ProstresQL, SQL Server and MySql.
  • The latest NuGet release is tagged and available in the releases page.
  • The main branch is also published on MyGet automatically.