protected void disconnect(){
  try {
    traceOperation("disconnect");
    conn.close();
  }
 catch (  Exception e) {
    traceOperation("disconnect",e);
  }
}

protected void disconnect ( ) { try { traceOperation ( "disconnect" ) ; conn . close ( ) ; } catch ( Exception e ) { traceOperation ( "disconnect" , e ) ; } }
close the database connection normally .
