try{
     rs.beforeFirst();
     while(rs.next())
    {
     xuehao=rs.getString(1);name=rs.getString(2);sex=rs.getString(3);
     banji=rs.getString(4);address=rs.getString(5);  
     a[i][0]=xuehao;
     a[i][1]=name;
     a[i][2]=sex;
     a[i][3]=banji;
     a[i][4]=address;
     i++;
     pbar.setValue(i);
     pbar.setString("查询了"+i+"条记录");
     }
     }
     catch(SQLException sqlerror)
     {
      sqlerror.printStackTrace();  
       }