JPA 利用javax.persistence.criteria类做复杂查询

/**
 * 数据查询测试
 * @param listedType
 * @param operatorId
 * @param area
 * @return
 */
public PagedResponse<Delegation> findAllTest(Integer listedType,String operatorId,String area,Pageable pageable){
    Page<Delegation> lists = delegationRepository.findAll(getSerachInfo(listedType,operatorId,area),pageable);
    return new PagedResponse<>(lists.getContent(), lists.getNumber(), lists.getSize(), lists.getTotalElements(), lists.getTotalPages(), lists.isLast());
}

public Specification<Delegation> getSerachInfo(Integer listedType,String operatorId,String area){
    return new Specification<Delegation>() {

        @Override
        public Predicate toPredicate(Root<Delegation> root, CriteriaQuery<?> criteriaQuery, CriteriaBuilder criteriaBuilder) {
            Join<Delegation,HousingRegistration> join = root.join("housingRegistration",JoinType.INNER);
            List<Predicate> predicateList = Lists.newArrayList();
            Path<Integer> listedTypePath = root.get("listedType");
            if(listedType!=null){
                Predicate predicate = criteriaBuilder.equal(listedTypePath,listedType);
                predicateList.add(predicate);
            }else {
                Predicate predicate0 = criteriaBuilder.equal(listedTypePath,0);
                Predicate predicate1 = criteriaBuilder.equal(listedTypePath,1);
                Predicate predicate = criteriaBuilder.or(predicate0,predicate1);
                predicateList.add(predicate);
            }
            if(StringUtils.isNotBlank(operatorId)){
                Path<String> operatorIdPath = root.get("practitionersId");
                Predicate predicate = criteriaBuilder.equal(operatorIdPath,operatorId);
                predicateList.add(predicate);
            }
            if(StringUtils.isNotBlank(area)){
                Path<String> areaPath = join.get("area");
                Predicate predicate = criteriaBuilder.equal(areaPath,area);
                predicateList.add(predicate);
            }
            Predicate predicateResult = null;
            if(predicateList!=null && predicateList.size()>0){
                for(Predicate predicate:predicateList){
                    if(predicateResult==null){
                        predicateResult = predicate;
                    }else {
                        predicateResult = criteriaBuilder.and(predicateResult,predicate);
                    }
                }
            }
            return predicateResult;
        }
    };
}

标签：predicate,JPA,criteriaBuilder,Predicate,lists,listedType,predicateList,criteria,
来源： https://blog.csdn.net/yssa1125001/article/details/89927037