hibernate查一个表的其中几个字段的问题

Question

hibernatejpajava

Answer 1

要用什么就用selections.什么呀

Answer 2

用的是spring data jpa，实现的是hibernate...
Specification<Users> spec = new Specification<Users>() {

@Override
public Predicate toPredicate(Root<Users> root, CriteriaQuery<?> query,
CriteriaBuilder cb) {
// TODO Auto-generated method stub
List<Predicate> ps = new ArrayList<Predicate>();
ps.add(cb.equal(root.<String>get("userName"), userName));

List<Selection<?>> selections = new ArrayList<Selection<?>>();
selections.add(root.get("id"));
selections.add(root.get("birth"));
selections.add(root.get("userName"));

query.multiselect(selections).where(ps.toArray(new Predicate[ps.size()]));
return query.getRestriction();
}