OracleDataReader.GetOrdinal(String) Method

Reference

Definition

Namespace:: System.Data.OracleClient

Assembly:: System.Data.OracleClient.dll

Important

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

public:
 virtual int GetOrdinal(System::String ^ name);

public:
 override int GetOrdinal(System::String ^ name);

public int GetOrdinal(string name);

public override int GetOrdinal(string name);

abstract member GetOrdinal : string -> int
override this.GetOrdinal : string -> int

override this.GetOrdinal : string -> int

Public Function GetOrdinal (name As String) As Integer

Public Overrides Function GetOrdinal (name As String) As Integer

Parameters

name: String

The name of the column.

Returns

Int32

The zero-based column ordinal.

Implements

GetOrdinal(String)

Examples

The following example demonstrates how to use the GetOrdinal method.

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

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();  
}

Remarks

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.

Applies to

Продукт	Версії
.NET Framework	1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1

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