The CData ADO.NET Provider for Amazon Redshift implements two ADO.NET interfaces you can use to retrieve data from Amazon Redshift: RedshiftDataAdapter and RedshiftDataReader objects. Whereas RedshiftDataAdapter objects retrieve a single result set of all the data that matches a query, RedshiftDataReader objects fetch data in subset increments as needed.

Using the RedshiftDataAdapter

Use the adapter's Fill method to retrieve data from the data source. An empty DataTable instance is passed as an argument to the Fill method. When the method returns, the DataTable instance is populated with the queried data. Note that the RedshiftDataAdapter is slower than the RedshiftDataReader because the Fill method needs to retrieve all data from the data source before returning.

The following example selects the ShipName and ShipCity columns of the Orders table:

C#

string connectionString = "User=admin;Password=admin;Database=dev;Server=examplecluster.my.us-west-2.redshift.amazonaws.com;Port=5439;";

using (RedshiftConnection connection = new RedshiftConnection(connectionString)) {
  RedshiftDataAdapter dataAdapter = new RedshiftDataAdapter(
  "SELECT ShipName, ShipCity FROM \"sales_db\".\"public\".Orders", connection);

  DataTable table = new DataTable();
  dataAdapter.Fill(table);

  Console.WriteLine("Contents of Orders.");

  foreach (DataRow row in table.Rows) {
    Console.WriteLine("{0}: {1}", row["ShipName"], row["ShipCity"]);
  }
}

VB.NET

Dim connectionString As String = "User=admin;Password=admin;Database=dev;Server=examplecluster.my.us-west-2.redshift.amazonaws.com;Port=5439;"

Using connection As New RedshiftConnection(connectionString)
  Dim dataAdapter As New RedshiftDataAdapter("SELECT ShipName, ShipCity FROM \"sales_db\".\"public\".Orders", connection)

  Dim table As New DataTable()
  dataAdapter.Fill(table)

  Console.WriteLine("Contents of Orders.")

  For Each row As DataRow In table.Rows
    Console.WriteLine("{0}: {1}", row("ShipName"), row("ShipCity"))
  Next
End Using