public void fecharConexao(){
        try
        {
            if(c != null)
                c.close();
            if(stmt != null)
                stmt.close();
            if(rs != null)
                rs.close();
        }
        catch (SQLException ex)
        {
            Logger.getLogger(TrackingNumberWatcherDBConn.class.getName()).log(Level.SEVERE, null, ex);
        }
    }