Conn = DBConnector.getConnection();

// Initially inserted an empty_blob() to data base

//retrieving the record and locking it.

PreparedStatement pStatement = conn.prepareStatement("Select ............... for Update")

ResultSet result = pStatement.executeQuery();

System.out.println(result.getClass().getName());

result.next();

BLOB blob =((OracleResultSet)result).getBLOB(1);

OutputStream outStream = blob.setBinaryStream(1L);

int size = blob.getBufferSize(); 

byte[] buffer = new byte[size]; 

int length = -1; 

while ((length = inputStream.read(buffer)) != -1)

outStream.write(buffer, 0, length);

inputStream.close();

outStream.close();