spring data JPA 中的多属性排序---养老院管理系统涉及技术整理

在此介绍我所用的一种方式：

第一步，引包

import org.springframework.data.domain.Sort;import org.springframework.data.domain.Sort.Order;

第二步，service方法代码

　　@Override    public Page<TurnOverRecord> findAll(Integer pageNum, Integer pageSize, TurnOverRecord turnOverRecord) {//先按isTurnOver从小到大升序，再按turnOverTime升序        List< Order> orders=new ArrayList< Order>();        orders.add( new Order(Sort.Direction. ASC, "isTurnOver"));        orders.add( new Order(Sort.Direction. ASC, "turnOverTime"));        Pageable pageable= new PageRequest(pageNum - 1, pageSize, new Sort(orders));

Specification<TurnOverRecord> specification = new Specification<TurnOverRecord>() {            @Override            public Predicate toPredicate(Root<TurnOverRecord> root, CriteriaQuery<?> query, CriteriaBuilder cb) {                Predicate predicate = cb.conjunction();                //单属性排序//                query.orderBy(cb.asc(root.get("isTurnOver")));//                query.orderBy(cb.desc(root.get("id")));//                query.groupBy(root.get("id"));                query.distinct(true);                //判断是否有条件                predicate.getExpressions().add(cb.equal(root.get("flag"), 1));                if (turnOverRecord != null) {                    if (StringUtil.isNotNull(turnOverRecord.getMemberId())                            && StringUtil.isNotNullAndZero(turnOverRecord.getMemberId().getId())                            ) {                        predicate.getExpressions().add(cb.equal(root.get("memberId").get("id"), turnOverRecord.getMemberId().getId()));                    }                    if (StringUtil.isNotNull(turnOverRecord.getMemberId())                            && StringUtil.isNotNullAndBlank(turnOverRecord.getMemberId().getName())                            ) {                        predicate.getExpressions().add(cb.like(root.get("memberId").get("name"), "%"+turnOverRecord.getMemberId().getName().trim()+"%"));                    }                    if (StringUtil.isNotNull(turnOverRecord.getCreator())                            && StringUtil.isNotNullAndBlank(turnOverRecord.getCreator().getName())) {                        predicate.getExpressions().add(cb.like(root.get("creator").get("name"), "%"+turnOverRecord.getCreator().getName().trim() + "%"));                    }                }                return predicate;            }        };        return turnOverRecordDao.findAll(specification, pageable);    }