Mybatis 动态排序

  自己用mybatis进行动态排序的时候发现排序并没有实现，代码如下：

select rownum num,a.* from from bto_c3.bkr_orderpackage_all a
order by #{toptype} desc
where rownum < 11

  #是将传入的值当做字符串的形式，eg:select id,name,age from student where id =#{id},当前端把id值1，传入到后台的时候，就相当于 select id,name,age from student where id =‘1’.

  $是将传入的数据直接显示生成sql语句，eg:select id,name,age from student where id =${id},当前端把id值1，传入到后台的时候，就相当于 select id,name,age from student where id = 1.

所以这里需要注意，应该将#改为$:

select rownum num,a.* from from bto_c3.bkr_orderpackage_all a
order by ${toptype} desc
where rownum < 11