aggregate基础 使用记录

mongoDB中聚合(aggregate)的具体使用

咱们能够用$指定字段来表示选定的document的field,另外能够使用$$ROOT来表示选定的document的全部内容（例如:chosenDocument: {$push: '$$ROOT'}）

示例：按条件查找数据，将找到的结果进行排序并分组，而且须要返回分组后的全部文档内容；$push, $addToSet实现的功能同样

GrowthRecordSync.aggregate([
                { $match: cond },
                { $sort: {time_point: 1}},
                { $group: {
                    _id: { $year: "$time_point"}, 
                    count:{ $sum: 1}, 
                    result:{ 
                        // $addToSet: "$$ROOT"}
                        $push: "$$ROOT"}
                    }
                },
                { $sort: {_id: 1}}
            ],cb)

结果：

"data": [
    {
      "_id": 2018,
      "count": 1,
      "result": [
        {
          "_id": "5c514c3675844415dac30efc",
          "createDate": "2019-01-30T07:03:18.000Z",
          "lastModified": "2019-01-30T07:03:18.285Z",
          "time_point": "2018-11-14T00:00:00.000Z",
          "type": "entry",
          "eveid": "5bf60a4dfdb0ed18594b8ce6",
          "title": "A职",
          "description": "",
          "client": "584ec02dacbd274539b4ab16",
          "people": "5bf60a4dfdb0ed18594b8ce6",
          "people_no": "00000009",
          "people_name": "成成",
          "ou_name": "啊总经办",
          "ou": "5858a50bdc2a25120dcf5163",
          "terminated": false,
          "activate": true,
          "block_reason": "",
          "block": false,
          "validTo": "9999-12-31T15:59:59.999Z",
          "validFrom": "2019-01-29T16:00:00.000Z",
          "__v": 0
        }
      ]
    },
    {
      "_id": 2019,
      "count": 2,
      "result": [
        {
          "_id": "5c6a979b1a921a16cc592fac",
          "createDate": "2019-02-18T11:31:39.000Z",
          "lastModified": "2019-02-18T11:31:39.062Z",
          "client": "584ec02dacbd274539b4ab16",
          "people": "5bf60a4dfdb0ed18594b8ce6",
          "people_no": "00000009",
          "ou_name": "33总经办",
          "ou": "5858a50bdc2a25120dcf5163",
          "time_point": "2019-02-20T00:00:00.000Z",
          "create_people": "585a17ae2098688d02eeade7",
          "type": "cus",
          "eveid": "5c6a979b1a921a16cc592fab",
          "title": "098765432dd1",
          "description": "88776787888",
          "terminated": false,
          "activate": true,
          "block_reason": "",
          "block": false,
          "validTo": "9999-12-31T15:59:59.999Z",
          "validFrom": "2019-02-17T16:00:00.000Z",
          "img": [
            "5c6a97221a921a16cc592fa5"
          ],
          "__v": 0
        },
        {
          "_id": "5c6a97271a921a16cc592fa9",
          "createDate": "2019-02-18T11:29:43.000Z",
          "lastModified": "2019-02-18T11:29:43.810Z",
          "client": "584ec02dacbd274539b4ab16",
          "people": "5bf60a4dfdb0ed18594b8ce6",
          "people_no": "00000009",
          "ou_name": "33总经办",
          "ou": "5858a50bdc2a25120dcf5163",
          "time_point": "2019-02-20T00:00:00.000Z",
          "create_people": "585a17ae2098688d02eeade7",
          "type": "cus",
          "eveid": "5c6a97271a921a16cc592fa8",
          "title": "098765432dd1",
          "description": "88776787888",
          "terminated": false,
          "activate": true,
          "block_reason": "",
          "block": false,
          "validTo": "9999-12-31T15:59:59.999Z",
          "validFrom": "2019-02-17T16:00:00.000Z",
          "img": [
            "5c6a97221a921a16cc592fa5"
          ],
          "__v": 0
        }
    ]
}

 

mongodb-模糊查询+聚合函数+连表查询+排序

 在 mongodb中用的主要是$regex来实现模糊查询

$project：修改输入文档的结构。能够用来重命名、增长或删除域，也能够用于建立计算结果以及嵌套文档。 $match：用于过滤数据，只输出符合条件的文档。$match使用MongoDB的标准查询操做。 $limit：用来限制MongoDB聚合管道返回的文档数。 $skip：在聚合管道中跳过指定数量的文档，并返回余下的文档。 $unwind：将文档中的某一个数组类型字段拆分红多条，每条包含数组中的一个值。
　　例：table1: 

{_id:1,result:[
    {name:"a",age:"18"},
    {name:"b",age:"19"},
    {name:"c",age:"20"}]
} 

执行db.table1.aggregate({"$unwind":"$result"})后的结果为

{id:1,result:{name:"a",age:"18"}},
{id:1,result:{name:"b",age:"19"}},
{id:1,result:{name:"c",age:"20"}} 

$group：将集合中的文档分组，可用于统计结果。 $sort：将输入文档排序后输出。 $geoNear：输出接近某一地理位置的有序文档。

聚合aggregate 管道运算符（全）

 

$setIntersection: 是取两个数组的交集

isShow: { $setIntersection: [ "$positions", current_positions ] }