Hibernate分页查询

矫情吗；* 2021-09-02 10:08 470阅读 0赞

### Hibernate分页查询 ###

*  代码实现

# 代码实现 #

public PageDataDomain<DataSourceDataFindAllBySourceId> displayDate(Integer pageNumber, Integer pageSize, String keyWord, Long dataSourceId) {
    
            PageDataDomain<DataSourceDataFindAllBySourceId> pageDataDomain = new PageDataDomain<>();
            Sort sort = Sort.by(Sort.Direction.DESC,"id");
            PageRequest pageRequest = PageRequest.of(pageNumber-1,pageSize,sort);
            Specification<DataSourceData> specification = new Specification<DataSourceData>() {
                @Override
                public Predicate toPredicate(Root<DataSourceData> root, CriteriaQuery<?> criteriaQuery, CriteriaBuilder criteriaBuilder) {
                    Predicate restrictions = criteriaBuilder.conjunction();
                    if(dataSourceId != null ){
                        Path path = root.get("dataSourceId");
                        Predicate pre = criteriaBuilder.equal(path, dataSourceId);
                        restrictions = criteriaBuilder.and(restrictions,pre);
                    }
                    if(keyWord != null){
                        Path chineseName = root.get("chineseName");
                        Predicate pd = criteriaBuilder.like(chineseName, keyWord);
                        restrictions = criteriaBuilder.and(restrictions,pd);
                    }
                    Predicate  predicate = criteriaBuilder.and(restrictions);
                    return predicate;
                }
            };
            Page<DataSourceData> dataSourceDataPage = dataSourceDataRepository.findAll(specification, pageRequest);
            //总记录数
            pageDataDomain.setTotal(dataSourceDataPage.getTotalElements());
            //当前页
            pageDataDomain.setCurrent(pageNumber);
            pageDataDomain.setSize(pageSize);
            //总条数
            pageDataDomain.setPages(dataSourceDataPage.getTotalPages());
            dataSourceDataPage.getContent().forEach(dataSourceData -> {
                DataSourceDataFindAllBySourceId dataSourceDataFindAllBySourceId = new DataSourceDataFindAllBySourceId();
                BeanUtils.copyProperties(dataSourceData, dataSourceDataFindAllBySourceId);
                pageDataDomain.getRecords().add(dataSourceDataFindAllBySourceId);
            });
            return pageDataDomain;
        }