连贯操作order用于对数据排序,同SQL语句中的order by。
$model->order('a desc,b,c asc')->select();
$model->order(array('a'=>'desc','b','c'=>'asc'))->select();
生成的SQL语句:`select * from table order by a desc,b,c asc`

$model->order('a desc,b,c asc')->select();
$model->order(array('a'=>'desc','b','c'=>'asc'))->select();
生成的SQL语句:`select * from table order by a desc,b,c asc`