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

Using the LakebaseDataAdapter

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 LakebaseDataAdapter is slower than the LakebaseDataReader 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=lakebase;Password=admin;Database=lakebase;Server=127.0.0.1;Port=5432";

using (LakebaseConnection connection = new LakebaseConnection(connectionString)) {
  LakebaseDataAdapter dataAdapter = new LakebaseDataAdapter(
  "SELECT ShipName, ShipCity FROM \"lakebase\".\"schema01\".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=lakebase;Password=admin;Database=lakebase;Server=127.0.0.1;Port=5432"

Using connection As New LakebaseConnection(connectionString)
  Dim dataAdapter As New LakebaseDataAdapter("SELECT ShipName, ShipCity FROM \"lakebase\".\"schema01\".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