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LINQ to DynamoDB 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 DynamoDB Data Provider.

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

    The connection to DynamoDB is made using your AccessKey, SecretKey, and optionally your Domain and Region. Your AccessKey and SecretKey can be obtained on the security credentials page for your Amazon Web Services account. Your Region will be displayed in the upper left-hand corner when you are logged into DynamoDB.

    Below is a typical connection string:

    Access Key=xxx;Secret Key=xxx;Domain=amazonaws.com;Region=OREGON;
  5. If saving your entity connection to App.Config, set an entity name. In this example we are setting DynamoDBEntities 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:

DynamoDBEntities context = new DynamoDBEntities(); var leadQuery = from lead in context.Lead select lead; foreach (var result in leadQuery) { Console.WriteLine("{0} {1} ", result.Id, result.Industry); }

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