try{
    conn.setAutoCommit(false);

    stat.executeUpdate(strSQL5);//这个是执行update操作
    stat.executeUpdate(strSQL6);//这个是执行insert操作

         System.out.println("Data submission OK");
    conn.commit();
                           
    System.out.println("truck " + unNametruckid[xx]+ " Data update is complete");
                            
  }catch(SQLException e){
    conn.rollback();
    conn.close();
         System.out.println("wrong:"+e);
  }