SpringBoot list查询方法

SpringBoot中根据不同查询条件，获取list列表。
@Component
public class QuerySpecifications {}

（1）根据商户，查询商品全部列表

public Specification<Goods> fieldOwnerGoods(User owner) {
    return new Specification<Goods>() {
        @Override
        public Predicate toPredicate(Root<Goods> root, CriteriaQuery<?> criteriaQuery, CriteriaBuilder criteriaBuilder) {
            return criteriaBuilder.equal(root.get("owner"), owner);
        }
    };
}

@Service 中使用方法

public DataTablesOutput<Goods> list(DataTablesInput input, User owner) {
    DataTablesOutput<Goods> output = goodsRepository.findAll(input, querySpecifications.goodsForOwner(owner));
    log.debug("{}", output);
    return output;
}

（2）根据不同的支付状态进行查询，获取list列表
PayState 支付状态-- 0:未支付，1：已支付，2：已取消
way 订单来源--0:后台  1：手机端

查询条件：（1）支付状态为1的  （2）支付状态为1，订单状态来源为0 （3）支付状态为2  （4）商户名称下的订单

public Specification<com.ishare.football.model.Order> orderForOwner(User owner) {
    return new Specification<Order>() {
        @Override
        public Predicate toPredicate(Root<Order> root, CriteriaQuery<?> criteriaQuery, CriteriaBuilder criteriaBuilder) {
            List<Predicate> predicates = Lists.newArrayList();
            Predicate predicate = criteriaBuilder.equal(root.get("payState"), 1);
            Predicate predicate6 = criteriaBuilder.equal(root.get("payState"), 2);
            Predicate predicate1 = criteriaBuilder.equal(root.get("payState"), 0);
            Predicate predicate2 = criteriaBuilder.equal(root.get("way"), 1);
            Predicate predicate3 = criteriaBuilder.and(predicate1, predicate2);
            Predicate predicate4 = criteriaBuilder.or(predicate, predicate3, predicate6);
            Predicate predicate5 = criteriaBuilder.equal(root.get("fieldSchedule").get("field").get("owner"), owner);
            return criteriaBuilder.and(predicate4, predicate5);
        }
    };
}

@Service 中使用方法

public DataTablesOutput<Order> list(DataTablesInput input, User user) {
    input.addOrder("fieldSchedule.start",false);//排序方法，按照场地开始时间排序，false 倒叙，true 正序
    DataTablesOutput<Order> output = orderRepository.findAll(input, querySpecifications.orderForOwner(user));
    log.debug("{}", output);

    return output;
}

（3）多个列表，查询条件不同，放到一个方法里

public Specification<com.ishare.football.model.Order> orderForOwnerAndPayState(User owner, int single) {
    return new Specification<Order>() {
        @Override
        public Predicate toPredicate(Root<Order> root, CriteriaQuery<?> criteriaQuery, CriteriaBuilder criteriaBuilder) {
            List<Predicate> predicates = Lists.newArrayList();
            //single:0 待校验，1：已付款，2：已取消，3：待付款
            Predicate predicate = criteriaBuilder.equal(root.get("fieldSchedule").get("field").get("owner"), owner);
            if(single == 0){
                Predicate predicate1 = criteriaBuilder.equal(root.get("state"), 0);
                Predicate predicate2 = criteriaBuilder.equal(root.get("payState"), 1);
                Predicate predicate3 = criteriaBuilder.equal(root.get("way"), 0);
                Predicate predicate4 = criteriaBuilder.and(predicate1, predicate2,predicate3);
                return criteriaBuilder.and(predicate, predicate4 );
            }else if(single == 1){
                Predicate predicate1 = criteriaBuilder.equal(root.get("payState"), 1);
                return criteriaBuilder.and(predicate, predicate1 );

            }else if(single == 2){
                Predicate predicate1 = criteriaBuilder.equal(root.get("payState"), 2);
                return criteriaBuilder.and(predicate, predicate1 );

            }else if(single == 3){
                Predicate predicate1 = criteriaBuilder.equal(root.get("payState"), 0);
                Predicate predicate2 = criteriaBuilder.equal(root.get("way"), 1);
                Predicate predicate3 = criteriaBuilder.and(predicate1, predicate2);
                return criteriaBuilder.and(predicate, predicate3 );

            }else{
                return null;
            }

            /*return criteriaBuilder.and(predicates.toArray(new Predicate[predicates.size()]));*/
        }
    };
}

@Service 中使用方法

public DataTablesOutput<Order> listByPayState(DataTablesInput input, User owner, final int single) {
    input.addOrder("fieldSchedule.start",false);
    DataTablesOutput<Order> output = orderRepository.findAll(input, querySpecifications.orderForOwnerAndPayState(owner, single));
    log.debug("{}", output);
    return output;
}