DB2DataReader Class

In This Topic

Reads a forward-only stream of rows from DB2.

Syntax

Visual Basic
C#

'Declaration
 
Public Class DB2DataReader 
   Inherits Devart.Common.DbDataReaderBase
   Implements System.Collections.IEnumerable, System.Data.IDataReader, System.Data.IDataRecord, System.IDisposable

public class DB2DataReader : Devart.Common.DbDataReaderBase, System.Collections.IEnumerable, System.Data.IDataReader, System.Data.IDataRecord, System.IDisposable

Remarks

To create a DB2DataReader, you must call the ExecuteReader method of the DB2Command object, rather than directly using a constructor.

System.Data.Common.DbDataReader.IsClosed and RecordsAffected are the only properties that you can call after the DB2DataReader is closed. In some cases, you must call Close before you can call RecordsAffected.

Example

The following example creates a DB2Connection, a DB2Command, and a DB2DataReader. The example reads through the data, writing it out to the console. Finally, the example closes the DB2DataReader, then the DB2Connection.

csharp

public void ReadMyData(string myConnString)  {
        DB2Connection db2Connection = new DB2Connection(myConnString);
        DB2Command db2Command = (DB2Command)db2Connection.CreateCommand();
        db2Command.CommandText = "SELECT DeptNo, DName, Loc FROM Dept";
        db2Connection.Open();
        DB2DataReader db2Reader = db2Command.ExecuteReader();
        try {
                // Always call Read before accessing data.
                while (db2Reader.Read()) {
                Console.WriteLine(db2Reader.GetInt32(0).ToString() + " " + 
                db2Reader.GetString(1) + " " + db2Reader.GetString(2));
        }
        }
        finally {
                // always call Close when done reading.
                db2Reader.Close();

                // Close the connection when done with it.
                db2Connection.Close();
        }
}

Visual Basic

Public Sub ReadMyData(ByVal myConnString As String)
        Dim db2Connection As New DB2Connection(myConnString)
        Dim db2Command As DB2Command = db2Connection.CreateCommand()
                db2Command.CommandText = "SELECT DeptNo, DName, Loc FROM Dept"
        db2Connection.Open()
        Dim db2Reader As DB2DataReader = db2Command.ExecuteReader()
        Try
                ' Always call Read before accessing data.
                While db2Reader.Read()
                        Console.WriteLine(String.Concat(db2Reader.GetInt32(0).ToString(), " ", _
                        db2Reader.GetString(1), " ", db2Reader.GetString(2)))
                End While
        Finally
                ' always call Close when done reading.
                db2Reader.Close()

                        ' Close the connection when done with it.
                        db2Connection.Close()
        End Try
End Sub

Inheritance Hierarchy

System.Object
   System.MarshalByRefObject
      System.Data.Common.DbDataReader
         Devart.Common.DbDataReaderBase
            Devart.Data.DB2.DB2DataReader

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

DB2DataReader Members
Devart.Data.DB2 Namespace
DB2Connection Class
DB2Command Class

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