文章分类 - MongoDB

摘要：public List selectHotCity(){ DBObject dbObject = new BasicDBObject(); dbObject.put("isHot", true); DBObject fieldObject = new BasicDBObject(); fieldObject.put("zhName", true); fie... 阅读全文

posted @ 2019-03-18 17:10 dwtfukgv 阅读(755) 评论(0) 推荐(0)

MongoDB $elemMatch与aggregate

摘要：第一部分需求与问题 1.1 数据结构 1.1.1 插入测试数据 db.hhw.insert({ results: [ { item: "a", qty: 26, tags: ["blank", "red"], dim_cm: [ 1, 10 ] }, { item: "a", qty: 27, t 阅读全文

posted @ 2018-11-20 11:27 dwtfukgv 阅读(1513) 评论(0) 推荐(0)