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LINQ to MongoDB Data

LINQ provides general-purpose query facilities in .NET Framework 3.0 and above and provides one easy way to programmatically access data through from CData ADO.NET Data Providers. This example uses LINQ to access information from the MongoDB Data Provider.

This article demonstrates how to use LINQ to access MongoDB tables through the CData ADO.NET Data Provider for MongoDB. To do this you will LINQ to Entity Framework, which is used to generate the connection and can be used with any CData ADO.NET Data Providers to access data via 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 MongoDB Data Source".
  4. Enter your data source connection information.

    Set the Server, Database, User, and Password connection properties to connect to MongoDB. To access MongoDB collections as tables you can use automatic schema discovery or write your own schema definitions. Schemas are defined in .rsd files, which have a simple format. You can also execute free-form queries that are not tied to the schema.

    Below is a typical connection string:

    Server=MyServer;Port=27017;Database=test;User=test;Password=Password;
  5. If saving your entity connection to App.Config, set an entity name. In this example we are setting MongoDBEntities 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:

MongoDBEntities context = new MongoDBEntities(); var restaurantsQuery = from restaurants in context.restaurants select restaurants; foreach (var result in restaurantsQuery) { Console.WriteLine("{0} {1} ", result._id, result.borough); }

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