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Connect .NET applications with the Cassandra real-time NoSQL cloud database service. Use Apache Cassandra as the big data backend that powers your .NET applications.

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LINQ to Cassandra Data


LINQ offers versatile querying capabilities within the .NET Framework (v3.0+), offering a straightforward method for programmatic data access through CData ADO.NET Data Providers. In this article, we demonstrate the use of LINQ to retrieve information from the Cassandra Data Provider.

This article illustrates using LINQ to access tables within the Cassandra via the CData ADO.NET Data Provider for Cassandra. To achieve this, we will use LINQ to Entity Framework, which facilitates the generation of connections and can be seamlessly employed with any CData ADO.NET Data Providers to access data through LINQ.

See the help documentation for a guide to setting up an EF 6 project to use the provider.

  1. In a new project in Visual Studio, right-click on the project and choose to add a new item. Add an ADO.NET Entity Data Model.
  2. Choose EF Designer from Database and click Next.
  3. Add a new Data Connection, and change your data source type to "CData Cassandra Data Source".

  4. Enter your data source connection information.

    Set the Server, Port, and Database connection properties to connect to Cassandra. Additionally, to use internal authentication set the User and Password connection properties.

    Below is a typical connection string:

    Database=MyCassandraDB;Port=7000;Server=127.0.0.1;
  5. If saving your entity connection to App.Config, set an entity name. In this example we are setting CassandraEntities as our entity connection in App.Config.
  6. Enter a model name and select any tables or views you would like to include in the model.

Using the entity you created, you can now perform select , update, delete, and insert commands. For example:

CassandraEntities context = new CassandraEntities(); var customerQuery = from customer in context.Customer select customer; foreach (var result in customerQuery) { Console.WriteLine("{0} {1} ", result.Id, result.City); }

See "LINQ and Entity Framework" chapter in the help documentation for example queries of the supported LINQ.