mongodb在java中的查询

public Price queryPriceById(String id) throws Exception {
　　return mongoTemplate.findById(new ObjectId(id), Price.class, PRICE_COLLECTION);
}

    public Price queryPriceByName(String name) throws Exception {
        Price price = null;
        price = mongoTemplate.findOne(new Query(Criteria.where("name").is(name)), Price.class, PRICE_COLLECTION);
        return price;
    }