如何使用spring数据jpa Sort.Order.nullslast

Question

I used nullslast() as the sample code as below,

        List<Sort.Order> orders = new ArrayList<>();

        Sort.Order orderAuditTime = new Sort.Order(Sort.Direction.DESC,"auditTime");
        Sort.Order orderEntryTime = new Sort.Order(Sort.Direction.DESC,"customer.entryTime");

        orders.add(orderAuditTime.nullsLast());
        orders.add(orderEntryTime);

        sort = new Sort(orders);

but got sql without nulls last like :

order by
    auditrecor0_.audit_time desc,
    customer1_.entry_time desc limit ?

Can someone help me why orderAuditTime.nullsLast() doesn't work ?

The database is postgre and the orm framework is hibernate.

Answer 1

As far as I can see, instances of Sort.Order get converted to javax.persistence.criteria.Order. This interface does not have support for nulls first/last:

package javax.persistence.criteria;

public interface Order {
    Order reverse();
    boolean isAscending();
    Expression<?> getExpression();
}

Thus, nulls first/last specified on Sort.Order is ignored.