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LINQ to Parquet 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 Parquet Data Provider.

This article demonstrates how to use LINQ to access Parquet tables through the CData ADO.NET Data Provider for Parquet. 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 Parquet Data Source".
  4. Enter your data source connection information.

    Connect to your local Parquet file(s) by setting the URI connection property to the location of the Parquet file.

    Below is a typical connection string:

    URI=C:\folder able.parquet;
  5. If saving your entity connection to App.Config, set an entity name. In this example we are setting ParquetEntities 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 commands. For example:

ParquetEntities context = new ParquetEntities(); var sampletable_1Query = from sampletable_1 in context.SampleTable_1 select sampletable_1; foreach (var result in sampletable_1Query) { Console.WriteLine("{0} {1} ", result.Id, result.Id); }

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