The CData ADO.NET Provider for DB2 implements two ADO.NET interfaces you can use to retrieve data from DB2: DB2DataAdapter and DB2DataReader objects. Whereas DB2DataAdapter objects retrieve a single result set of all the data that matches a query, DB2DataReader objects fetch data in subset increments as needed.

Using the DB2DataAdapter

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 DB2DataAdapter is slower than the DB2DataReader because the Fill method needs to retrieve all data from the data source before returning.

The following example selects the Id and Author columns of the Books table:

C#

string connectionString = "Server=10.0.1.2;Port=50000;User=admin;Password=admin;Database=test";

using (DB2Connection connection = new DB2Connection(connectionString)) {
  DB2DataAdapter dataAdapter = new DB2DataAdapter(
  "SELECT Id, Author FROM \"Sample\".\"DB2INST1\".Books", connection);

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

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

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

VB.NET

Dim connectionString As String = "Server=10.0.1.2;Port=50000;User=admin;Password=admin;Database=test"

Using connection As New DB2Connection(connectionString)
  Dim dataAdapter As New DB2DataAdapter("SELECT Id, Author FROM \"Sample\".\"DB2INST1\".Books", connection)

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

  Console.WriteLine("Contents of Books.")

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