OracleDataReader.GetOrdinal Method
Assembly: System.Data.OracleClient (in system.data.oracleclient.dll)
GetOrdinal performs a case-sensitive lookup first. If it fails, a second case-insensitive search is made.
GetOrdinal is kana-width insensitive.
Because ordinal-based lookups are more efficient than named lookups, it is inefficient to call GetOrdinal within a loop. Instead, call GetOrdinal once and then assign the results to an integer variable for use within the loop.
The following example demonstrates how to use the GetOrdinal method.
[Visual Basic]
Public Sub ReadOracleData(ByVal connectionString As String)
Dim queryString As String = "SELECT OrderID, CustomerID FROM Orders"
Dim connection As New OracleConnection(connectionString)
Dim command As New OracleCommand(queryString, connectionString)
connection.Open()
Dim reader As OracleDataReader = command.ExecuteReader()
Dim custIdCol As Integer = reader.GetOrdinal("CustomerID")
Do While reader.Read()
Console.WriteLine("CustomerID = {0", reader.GetString(custIdCol))
Loop
reader.Close()
connection.Close()
End Sub
[C#]
public void ReadOracleData(string connectionString)
{
string queryString = "SELECT OrderID, CustomerID FROM Orders";
OracleConnection connection = new OracleConnection(connectionString);
OracleCommand command = new OracleCommand(queryString,connection);
connection.Open();
OracleDataReader reader = command.ExecuteReader();
int custIdCol = reader.GetOrdinal("CustomerID");
while (reader.Read())
Console.WriteLine("CustomerID = {0", reader.GetString(custIdCol));
reader.Close();
connection.Close();
Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.
