使用条件休眠嵌套查询

Question

Is it posible to create a criteria for generating below sql:

select name from (select distinct name from person) as aliasname  order by lower(name);

here there are two sql -

1. select distinct name from person

2. select name from <output of 1> as aliasname order by lower(name)

i want to create the criteria and then do criteria.list()

Answer 1

I think, this will suit your needs:

criteria.addOrder(Order.asc("name").ignoreCase())
        .setProjection(Projections.distinct(Projections.property("name")))
        .list();

or, this criteria uses a DetachedCriteria with a name projection as a subquery:

DetachedCriteria distinctNamesCriteria = DetachedCriteria.forClass(Person.class);
distinctNamesCriteria.setProjection(Projections.distinct(Projections.property("name")));

criteria.add(SubQueries.propertyIn("name", distinctNamesCriteria))
        .addOrder(Order.asc("name").ignoreCase())
        .list();

Answer 2

I don't have an answer for you, but why are you you doing a second select?

SELECT DISTINCT NAME FROM PERSON AS ALIASNAME ORDER BY LOWER(NAME)

would return the same data.