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

Using the HubDBDataAdapter

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 HubDBDataAdapter is slower than the HubDBDataReader because the Fill method needs to retrieve all data from the data source before returning.

The following example selects the PartitionKey and Name columns of the NorthwindProducts table:

C#

string connectionString = "AuthScheme=OAuth;OAuthClientID=MyOAuthClientID;OAuthClientSecret=MyOAuthClientSecret;CallbackURL=http://localhost:33333;";

using (HubDBConnection connection = new HubDBConnection(connectionString)) {
  HubDBDataAdapter dataAdapter = new HubDBDataAdapter(
  "SELECT PartitionKey, Name FROM NorthwindProducts", connection);

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

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

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

VB.NET

Dim connectionString As String = "AuthScheme=OAuth;OAuthClientID=MyOAuthClientID;OAuthClientSecret=MyOAuthClientSecret;CallbackURL=http://localhost:33333;"

Using connection As New HubDBConnection(connectionString)
  Dim dataAdapter As New HubDBDataAdapter("SELECT PartitionKey, Name FROM NorthwindProducts", connection)

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

  Console.WriteLine("Contents of NorthwindProducts.")

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