LINQ to Teradata Data

This article illustrates using LINQ to access tables within the Teradata via the CData ADO.NET Data Provider for Teradata. 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 Teradata Data Source".

4. Enter your data source connection information.

   To connect to Teradata, provide authentication information and specify the database server name.

   • User: Set this to the username of a Teradata user.
   • Password: Set this to the password of the Teradata user.
   • DataSource: Specify the Teradata server name, DBC Name, or TDPID.
   • Port: Specify the port the server is running on.
   • Database: Specify the database name. If not specified, the default database is used.

   Below is a typical connection string:

   User=myuser;Password=mypassword;Server=localhost;Database=mydatabase;

👁 Required connection properties for the data source. (QuickBooks is shown.)

5. If saving your entity connection to App.Config, set an entity name. In this example we are setting TeradataEntities 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:

TeradataEntities context = new TeradataEntities();

var northwindproductsQuery = from northwindproducts in context.NorthwindProducts
 select northwindproducts;

foreach (var result in northwindproductsQuery) {
 Console.WriteLine("{0} {1} ", result.Id, result.ProductId);
}

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