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

Using the ConnectDataAdapter

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 ConnectDataAdapter is slower than the ConnectDataReader 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 = "AuthScheme=basic;URL=http://hostname:port/rest.rsc;User=my_user;Password=my_password;";

using (ConnectConnection connection = new ConnectConnection(connectionString)) {
  ConnectDataAdapter dataAdapter = new ConnectDataAdapter(
  "SELECT ShipName, ShipCity FROM 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 = "AuthScheme=basic;URL=http://hostname:port/rest.rsc;User=my_user;Password=my_password;"

Using connection As New ConnectConnection(connectionString)
  Dim dataAdapter As New ConnectDataAdapter("SELECT ShipName, ShipCity FROM 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