GetOracleLob(Int32) Method

In This Topic

Gets the value of the specified column as a OracleLob object.

Syntax

Visual Basic
C#

'Declaration
 
Public Overloads Function GetOracleLob( _
   ByVal i As Integer _
) As OracleLob

public OracleLob GetOracleLob( 
   int i
)

Parameters

i: The zero-based column ordinal.

Return Value

The value of the specified column as a OracleLob object.

Remarks

Refer to "Working with BLOB and CLOB Data" article for detailed information.

Example

This example shows how to download a LOB field from a table using GetOracleLob method.

csharp

public void DownloadLob(OracleConnection myConnection)
{
  OracleCommand myCommand = new OracleCommand("SELECT * FROM Test.Pictures", myConnection);
  myConnection.Open();
  OracleDataReader myReader = myCommand.ExecuteReader(System.Data.CommandBehavior.Default);
  try
  {
    while (myReader.Read())
    {
      OracleLob myLob = myReader.GetOracleLob(myReader.GetOrdinal("Picture"));
      if(!myLob.IsNull)
      {
        string FN = myReader.GetString(myReader.GetOrdinal("PicName"));
        FileStream fs = new FileStream("D:\\Tmp\\"+FN+".bmp", FileMode.Create);
        BinaryWriter w = new BinaryWriter(fs);
        w.Write(myLob.Value);
        w.Close();
        fs.Close();
        Console.WriteLine(FN+" downloaded.");
      }
    }
  }
  finally
  {
    myReader.Close();
    myConnection.Close();
  }
}

Visual Basic

Public Sub DownloadLob(ByVal myConnection As OracleConnection)
  Dim myCommand As New OracleCommand("SELECT * FROM Test.Pictures", myConnection)
  myConnection.Open()
  Dim myReader As OracleDataReader = myCommand.ExecuteReader(System.Data.CommandBehavior.Default)
  Try
    While myReader.Read()
      Dim myLob As OracleLob = myReader.GetOracleLob(myReader.GetOrdinal("Picture"))
      If Not myLob.IsNull Then
        Dim FN As String = myReader.GetString(myReader.GetOrdinal("PicName"))
        Dim fs As FileStream = New FileStream("D:\Tmp\" + FN + ".bmp", FileMode.Create)
        Dim w As BinaryWriter = New BinaryWriter(fs)
        w.Write(myLob.Value)
        w.Close()
        fs.Close()
        Console.WriteLine(String.Concat(FN, " downloaded."))
      End If
    End While
  Finally
    myReader.Close()
    myConnection.Close()
  End Try
End Sub

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 Class
OracleDataReader Members
Overload List
OracleLob Class

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