jpa-2.0 - CriteriaBuilder.and & CriteriaBuilder.or，操作方法？

Question

我正在尝试更改以下 HQL 以使用 JPA 标准:

select distinct d from Department d 
left join fetch d.children c 
where d.parent is null 
and (
    d.name like :term 
    or c.name like :term
    ) 
order by d.name

Department有一个 Set<Department> child 的。

标准:

CriteriaBuilder cb = getEntityManager().getCriteriaBuilder();
CriteriaQuery<Department> c = cb.createQuery(Department.class);
Root<Department> root = c.from(Department.class);
root.fetch("children", JoinType.LEFT);
Path<Department> children = root.join("children", JoinType.LEFT);
c.orderBy(cb.asc(root.get("name")));
c.distinct(true);
c.where(cb.isNull(root.get("parent")));
String param = "%" + "term" + "%";
cb.and(cb.like(root.<String> get("name"), param));
cb.or(cb.like(children.<String> get("name"), param));

TypedQuery<Department> tq = getEntityManager().createQuery(c);
departments = tq.getResultList();

我知道它可能有点简洁，但是，HQL 返回 24 和 Criteria 版本 28。我想我没有处理:

and (x = y OR z = y)

正确。任何指针将不胜感激。
谢谢。

Answer 1

这是 JPQL 查询的 where 子句:

where d.parent is null 
and (
    d.name like :term 
    or c.name like :term
    ) 

where 子句包含两个谓词:

d.parent is null 

和

(d.name like :term 
 or c.name like :term)

第二个谓词是 or包含两个谓词:

d.name like :term

和

c.name like :term

因此，您的标准查询中需要相同的结构:

Predicate orClause = 
    cb.or(cb.like(root.<String>get("name"), param),
          cb.like(children.<String>get("name"), param));

c.where(cb.isNull(root.get("parent")),
        orClause);