OracleDataReader Class

In This Topic

Reads a forward-only stream of rows from Oracle.

Syntax

Visual Basic
C#

'Declaration
 
Public Class OracleDataReader 
   Inherits Devart.Common.DbDataReaderBase
   Implements System.Collections.IEnumerable, System.Data.IDataReader, System.Data.IDataRecord, System.IDisposable

public class OracleDataReader : Devart.Common.DbDataReaderBase, System.Collections.IEnumerable, System.Data.IDataReader, System.Data.IDataRecord, System.IDisposable

Remarks

To create a OracleDataReader, you must call the ExecuteReader method of the OracleCommand object, rather than directly using a constructor.

System.Data.Common.DbDataReader.IsClosed and RecordsAffected are the only properties that you can call after the OracleDataReader is closed. In some cases, you must call Close before you can call RecordsAffected.

Example

The following example creates a OracleConnection, a OracleCommand, and a OracleDataReader. The example reads through the data, writing it out to the console. Finally, the example closes the OracleDataReader, then the OracleConnection.

csharp

public void ReadMyData(string myConnString)  {
        OracleConnection myConnection = new OracleConnection(myConnString);
        OracleCommand myCommand = (OracleCommand)myConnection.CreateCommand();
        myCommand.CommandText = "SELECT DeptNo, DName, Loc FROM Test.Dept";
        myConnection.Open();
        OracleDataReader myReader = myCommand.ExecuteReader();
        try {
                // Always call Read before accessing data.
                while (myReader.Read()) {
                Console.WriteLine(myReader.GetInt32(0).ToString() + " " + 
                myReader.GetString(1) + " " + myReader.GetString(2));
        }
        }
        finally {
                // always call Close when done reading.
                myReader.Close();

                // Close the connection when done with it.
                myConnection.Close();
        }
}

Visual Basic

Public Sub ReadMyData(ByVal myConnString As String)
        Dim myConnection As New OracleConnection(myConnString)
        Dim myCommand As OracleCommand = myConnection.CreateCommand()
                myCommand.CommandText = "SELECT DeptNo, DName, Loc FROM Test.Dept"
        myConnection.Open()
        Dim myReader As OracleDataReader = myCommand.ExecuteReader()
        Try
                ' Always call Read before accessing data.
                While myReader.Read()
                        Console.WriteLine(String.Concat(myReader.GetInt32(0).ToString(), " ", _
                        myReader.GetString(1), " ", myReader.GetString(2)))
                End While
        Finally
                ' always call Close when done reading.
                myReader.Close()

                        ' Close the connection when done with it.
                        myConnection.Close()
        End Try
End Sub

Inheritance Hierarchy

System.Object
   System.MarshalByRefObject
      System.Data.Common.DbDataReader
         Devart.Common.DbDataReaderBase
            Devart.Data.Oracle.OracleDataReader

Requirements

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference

OracleDataReader Members
Devart.Data.Oracle Namespace
OracleConnection Class
OracleCommand Class

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