JPA CriteriaQuery 实现 Spring Data Pageable.getSort() [英] JPA CriteriaQuery implements Spring Data Pageable.getSort()
问题描述
我使用 JPA CriteriaQuery 来构建我的动态查询并传入一个 Spring Data Pageable 对象:
I used JPA CriteriaQuery to build my dynamic Query and pass in a Spring Data Pageable object:
sort=name,desc
在后端,我的存储库中有一个方法来支持动态查询:
At the backend I have a method in my Repository to support dynamic query:
public Page<User> findByCriteria(String username, Pageable page) {
CriteriaBuilder cb = em.getCriteriaBuilder();
CriteriaQuery<User> cq = cb.createQuery(User.class);
Root<User> iRoot = cq.from(User.class);
List<Predicate> predicates = new ArrayList<Predicate>();
if (StringUtils.isNotEmpty(username)) {
predicates.add(cb.like(cb.lower(iRoot.<String>get("username")), "%" + username.toLowerCase() + "%"));
}
Predicate[] predArray = new Predicate[predicates.size()];
predicates.toArray(predArray);
cq.where(predArray);
TypedQuery<User> query = em.createQuery(cq);
int totalRows = query.getResultList().size();
query.setFirstResult(page.getPageNumber() * page.getPageSize());
query.setMaxResults(page.getPageSize());
Page<User> result = new PageImpl<User>(query.getResultList(), page, totalRows);
return result;
}
注意:为了演示目的,我只放了一个参数.
Note: I put only one param for demo purpose.
然而,返回的数据是未排序的,因此我想问的是在 CriteriaQuery 中实现 Pageable 的任何方式.
However the returned data is unsorted therefore I would like to ask is that any way to implement Pageable in CriteriaQuery.
推荐答案
您可以从 spring 使用 QueryUtils 添加排序:query.orderBy(QueryUtils.toOrders(pageable.getSort(), root, builder));
You can add sorting using QueryUtils from spring:
query.orderBy(QueryUtils.toOrders(pageable.getSort(), root, builder));
这篇关于JPA CriteriaQuery 实现 Spring Data Pageable.getSort()的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!