基于hibernate实现的jpa接口，multiselect怎么不起作用

之前问过一次，没有人回答。。。。，再来问多一次～

使用jpa的仓库接口来查询数据，本意是根据条件来查询一个实体的指定属性字段，但是现在却把这个实体的所有属性都查出来了。问问大神们怎么解决。采用的是实现JpaSpecificationExecutor接口：代码如下：

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Specification spec = new Specification() {

@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").alias("id"));
    selections.add(root.get("birth").alias("birth"));
    selections.add(root.get("userName").alias("userName"));
       
       
    query.multiselect(selections);
       
    query.where(ps.toArray(new Predicate[ps.size()]));
    return query.getGroupRestriction();
}

};

return repository.findOne(spec);

预期是查到id,birth，userName的，现在却是这样：

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Hibernate:

select
    users0_.id as id1_22_,
    users0_.create_time as create_t2_22_,
    users0_.update_time as update_t3_22_,
    users0_.version as version4_22_,
    users0_.birth as birth5_22_,
    users0_.gendar as gendar6_22_,
    users0_.password as password7_22_,
    users0_.status as status8_22_,
    users0_.user_name as user_nam9_22_ 
from
    users users0_ 
where
    users0_.user_name=?

我已经multiselect里设置了，为什么还是这样。。。望解答

在网上找了很多都说是在multiselect里用root设置自己要查询的字段属性，可是根本没效果啊～～～