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

Using the SAPGatewayDataAdapter

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

The following example selects the Id and Column1 columns of the SampleTable_1 table:

C#

string connectionString = "InitiateOAuth=GETANDREFRESH;User=user;Password=password;URL=https://sapes5.sapdevcenter.com/sap/opu/odata/IWBEP/GWSAMPLE_BASIC/";

using (SAPGatewayConnection connection = new SAPGatewayConnection(connectionString)) {
  SAPGatewayDataAdapter dataAdapter = new SAPGatewayDataAdapter(
  "SELECT Id, Column1 FROM SampleTable_1", connection);

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

  Console.WriteLine("Contents of SampleTable_1.");

  foreach (DataRow row in table.Rows) {
    Console.WriteLine("{0}: {1}", row["Id"], row["Column1"]);
  }
}

VB.NET

Dim connectionString As String = "InitiateOAuth=GETANDREFRESH;User=user;Password=password;URL=https://sapes5.sapdevcenter.com/sap/opu/odata/IWBEP/GWSAMPLE_BASIC/"

Using connection As New SAPGatewayConnection(connectionString)
  Dim dataAdapter As New SAPGatewayDataAdapter("SELECT Id, Column1 FROM SampleTable_1", connection)

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

  Console.WriteLine("Contents of SampleTable_1.")

  For Each row As DataRow In table.Rows
    Console.WriteLine("{0}: {1}", row("Id"), row("Column1"))
  Next
End Using