GetOrdinal Method

OracleDataReader.GetOrdinal Method

Gets the column ordinal, given the name of the column.

Namespace:  System.Data.OracleClient
Assembly:  System.Data.OracleClient (in System.Data.OracleClient.dll)

public override int GetOrdinal(
	string name


Type: System.String

The name of the column.

Return Value

Type: System.Int32
The zero-based column ordinal.



GetOrdinal performs a case-sensitive lookup first. If it fails, a second case-insensitive search is made. The method throws an IndexOutOfRange exception if the zero-based column ordinal is not found.

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)


    Dim reader As OracleDataReader = command.ExecuteReader()

    Dim custIdCol As Integer = reader.GetOrdinal("CustomerID")

    Do While reader.Read()
        Console.WriteLine("CustomerID = {0}", reader.GetString(custIdCol))

End Sub


public void ReadOracleData(string connectionString)
    string queryString = "SELECT OrderID, CustomerID FROM Orders";
    OracleConnection connection = new OracleConnection(connectionString);
    OracleCommand command = new OracleCommand(queryString,connection);

    OracleDataReader reader = command.ExecuteReader();

    int custIdCol = reader.GetOrdinal("CustomerID");

    while (reader.Read())
        Console.WriteLine("CustomerID = {0}", reader.GetString(custIdCol));


Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1

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