JPA Grammar (especially the JPA! = Not equal to)

JPA Grammar (especially the JPA! = Not equal to)

Keyword : key words
the Sample : is directly on the method name example
JPQLsnipper : as written JPQL, @ Query an example

Complex queries

	@Override
	public JSONResult<PageResult<OrdOfflineOrderVO>> findOfflineOrder(OrdOfflineOrderSearchVO vo) {

		Page<OrdOfflineOrderPO> page= ordOfflineOrderRepository.findAll(new Specification<OrdOfflineOrderPO>() {

			@Override
			public Predicate toPredicate(Root<OrdOfflineOrderPO> root, CriteriaQuery<?> criteriaQuery, CriteriaBuilder criteriaBuilder) {
				List<Predicate> list = new ArrayList<Predicate>();
				if(StringUtils.isNotBlank(vo.getProductName())){
					list.add(criteriaBuilder.like(root.get("productName").as(String.class), "%"+vo.getProductName()+"%"));
				}
				if (vo.getStartTime()!=null) {
					//大于或等于传入时间
					list.add(criteriaBuilder.greaterThanOrEqualTo(root.get("createTimestamp").as(Date.class), vo.getStartTime()));
				}
				if (vo.getEndTime()!=null) {
					//小于或等于传入时间
					list.add(criteriaBuilder.lessThanOrEqualTo(root.get("createTimestamp").as(Date.class), vo.getEndTime()));
				}


				Predicate[] predicates = new Predicate[list.size()];
				return criteriaBuilder.and(list.toArray(predicates));
			}
		},vo.toPageRequest());
		List<OrdOfflineOrderVO> list=new ArrayList<>();
		 page.getContent().forEach(po->{
			 OrdOfflineOrderVO orderVO=new OrdOfflineOrderVO();
			 BeanUtils.copyProperties(po,orderVO);
			 list.add(orderVO);
		 });
		PageResult<OrdOfflineOrderVO> result = PageResult.of(page.getNumber(), page.getTotalPages(), page.getTotalElements(), list);
		return new JSONResult(result);
	}