Hibernate Dynamic Order

问题

Hi i want to sort in HQL

ORDER BY IF g.groupAdminId=:adminid THEN 1 ELSE 0 END ASC

But it doesn't work, i want to have all entities where the user is admin first, how can i archieve this?

回答1:

I don't believe it is possible to put named parameters outside a where clause.

It is possible to order according to expressions:

from User U
order by case
  when U.group.name = 'Admin' then 0
  when U.group.name = 'Superuser' then 1
  else 2
end asc

More on case in HQL docs :

For your particular problem (having admins before other users) I suggest making two queries and combining the two lists in Java.

There are other ways around this but I do not like any of them:

• Multiple mappings
• Custom functions

来源：https://stackoverflow.com/questions/9262413/hibernate-dynamic-order