The behavior of the NativeOracleTable is similar to NativeOracleArray class. The main difference is that NativeOracleTable can contain unlimited number of the elements.

This class represents OCI nested tables, and is intended for use in connected data access model.

Note that NativeOracleTable can be used in data binding with DataGrid as it implements IListSource interface.

This class is not available in OracleConnection.Direct mode.

This example demonstrates how to retrieve a NativeOracleTable object from the server and display its elements. To create required type and table and fill it with data you can use the following script:

CREATE OR REPLACE TYPE TEmployees AS 
  TABLE OF VARCHAR2(40);

CREATE TABLE CompanyEmpObject (
  Code NUMBER PRIMARY KEY,
  Company VARCHAR2(40),
  Employees TEmployees        
)NESTED TABLE Employees STORE AS N_TAB;

INSERT INTO CompanyEmpObject
  (Code, Company, Employees)
VALUES
  (1, 'Microsoft', TEmployees('PROGRAMMER', 'MANAGER', 'ELECTRICIAN', 'CLEANUP MEN'));
INSERT INTO CompanyEmpObject
  (Code, Company, Employees)
VALUES
  (2, 'Borland', TEmployees('PROGRAMMER', 'ELECTRICIAN', 'COURIER'));
INSERT INTO CompanyEmpObject
  (Code, Company, Employees)
VALUES
  (3, 'MC Donalds', TEmployees('SHOP ASSISTANT', 'CLERK',  'CLEANUP MEN'));
INSERT INTO CompanyEmpObject
  (Code, Company, Employees)
VALUES
  (4, 'Ford', TEmployees('MECHANICIAN', 'MANAGER'));

OracleConnection connection = new OracleConnection("User Id=scott;Password=tiger;Data Source=ora"); 
OracleCommand command = new OracleCommand("SELECT * FROM CompanyEmpObject", connection); 
connection.Open(); 
OracleDataReader dataReader = command.ExecuteReader(); 
try{ 
    int index = dataReader.GetOrdinal("Employees"); 
    while (dataReader.Read()) { 
            NativeOracleTable oraTable = dataReader.GetNativeOracleTable(index); 
             if (!oraTable.IsNull) { 
                        string[] employees = new string[oraTable.Count]; 
                        for (int i = 0; i < oraTable.Count; i++) 
                                employees[i] = (string)oraTable[i]; 
 
                        Console.WriteLine("Company: " + dataReader.GetString(1)); 
                        foreach (string str in employees) 
                                Console.WriteLine("\t" + str); 
                } 
                else{ 
                        Console.WriteLine("Company: " + dataReader.GetString(1)); 
                        Console.WriteLine("No vacancies"); 
                } 
        } 
} 
catch (Devart.Data.Oracle.OracleException ex) { 
  Console.WriteLine(ex.Message); 
} 
finally{ 
  dataReader.Close(); 
  connection.Close(); 
} 
Console.ReadLine();

Dim connection As New OracleConnection("User Id=scott;Password=tiger;Data Source=ora")
Dim command As New OracleCommand("SELECT * FROM CompanyEmpObject", connection)
connection.Open()
Dim dataReader As OracleDataReader = command.ExecuteReader()
Try
        Dim index As Integer = dataReader.GetOrdinal("Employees")
          While dataReader.Read()
                Dim oraTable As NativeOracleTable = dataReader.GetNativeOracleTable(index)
            If Not oraTable.IsNull Then
                        Dim employees(oraTable.Count) As String
                        Dim I As Integer
                        For I = 0 To oraTable.Count - 1
                                employees(I) = oraTable(I)
                Next I
                      Console.WriteLine("Company: " & dataReader.GetString(1))
                        For Each str As String In employees
                        Console.WriteLine(Chr(9) & str)
                      Next
            Else
                      Console.WriteLine("Company: " & dataReader.GetString(1))
                      Console.WriteLine("No vacancies")
    End If
  End While
Catch ex As Devart.Data.Oracle.OracleException
  Console.WriteLine(ex.Message)
Finally
  dataReader.Close()
  connection.Close()
End Try

System.Object
   System.MarshalByRefObject
      Devart.Data.Oracle.NativeOracleObjectBase
         Devart.Data.Oracle.NativeOracleArray
            Devart.Data.Oracle.NativeOracleTable

Reference

NativeOracleTable Members
Devart.Data.Oracle Namespace