Nhibernate使用CreateCriteria 如何实现 exists

Question

 public IList<Customer> QueryAllCustomerHasOrdersByHSql() {
            return Session.CreateQuery("from Customer c where exists( from Order a where a.Customer=c.Id)").List<Customer>();

        }

        public IList<Customer> QueryAllCustomerHasOrdersBySql() {
            return Session.CreateSQLQuery("select c.* from Customer c where exists(select b.Customer from `Order` b where b.Customer=c.CustomerId)")
                .AddEntity("c",typeof(Customer)).List<Customer>();              
        }

                //public IList<Customer> QueryAllCustomerHasOrdersByCriteria() { 
        //return Session.CreateCriteria(typeof(Customer))
        //    .Add(Restrictions.In("Customer",))

        //}

如何使用 CreateCriteria Restrictions 实现上面使用SQL的查询功能

Answer 1

http://stackoverflow.com/questions/1752792/nhibernate-createcriteria-and-exists-clause