Java 如何在mongoDB中使用morphia进行分组和计数？_Java_Mongodb_Morphia

Java 如何在mongoDB中使用morphia进行分组和计数？

java mongodb

Java 如何在mongoDB中使用morphia进行分组和计数？,java,mongodb,morphia,Java,Mongodb,Morphia,我将Morphia与Java中的MongoDB一起使用，我有这样的集合 {"_id":"5d5e7ce7869eef030869e85c", "ip":"66.249.79.181", "date":"2019-08-19T18:30:00.000Z", "request_url":"https://www.example.com/home", "status_code":"200", "bot":"Google Android", "type

我将Morphia与Java中的MongoDB一起使用，我有这样的集合

{"_id":"5d5e7ce7869eef030869e85c",
    "ip":"66.249.79.181",
    "date":"2019-08-19T18:30:00.000Z",
    "request_url":"https://www.example.com/home", 
    "status_code":"200", 
    "bot":"Google Android",
    "type":"type/html",
    "domain":"https://www.example.com"},

{"_id":"5d5e7ce7869eef030869e85c",
    "ip":"66.249.79.181",
    "date":"2019-08-19T18:30:00.000Z",
    "request_url":"https://www.example.com/home", 
    "status_code":"200", 
    "bot":"Google",
    "type":"type/html",
    "domain":"https://www.example.com"},

{"_id":"5d5e7ce7869eef030869e85c",
    "ip":"66.249.79.181",
    "date":"2019-08-19T18:30:00.000Z",
    "request_url":"https://www.example.com/home", 
    "status_code":"200", 
    "bot":"bing",
    "type":"type/html",
    "domain":"https://www.example.com"}

{"request_url":"https://www.example.com/home",
 "status_code":"200",
 "Google": 1,
 "Google Android": 1,
 "bing": 1,
 "type":"type/html", }

我需要使用分组（“request_url”）并获得“bot”字段的计数，如果我需要这样的结果该怎么办

{"_id":"5d5e7ce7869eef030869e85c",
    "ip":"66.249.79.181",
    "date":"2019-08-19T18:30:00.000Z",
    "request_url":"https://www.example.com/home", 
    "status_code":"200", 
    "bot":"Google Android",
    "type":"type/html",
    "domain":"https://www.example.com"},

{"_id":"5d5e7ce7869eef030869e85c",
    "ip":"66.249.79.181",
    "date":"2019-08-19T18:30:00.000Z",
    "request_url":"https://www.example.com/home", 
    "status_code":"200", 
    "bot":"Google",
    "type":"type/html",
    "domain":"https://www.example.com"},

{"_id":"5d5e7ce7869eef030869e85c",
    "ip":"66.249.79.181",
    "date":"2019-08-19T18:30:00.000Z",
    "request_url":"https://www.example.com/home", 
    "status_code":"200", 
    "bot":"bing",
    "type":"type/html",
    "domain":"https://www.example.com"}

{"request_url":"https://www.example.com/home",
 "status_code":"200",
 "Google": 1,
 "Google Android": 1,
 "bing": 1,
 "type":"type/html", }

如何通过“request_url”字段进行分组，并使用下面的聚合获取每个“bot”字段的计数：

db.collection.aggregate([
 {
    $group: {
      _id: {
        request_url: "$request_url",
        bot: "$bot"
      },
      type: {
        $max: "$type"
      },
      status_code: {
        $max: "$status_code"
      },
      count: {
        $sum: 1
      }
    }
  },
  {
    $group: {
      _id: "$_id.request_url",
      type: {
        $max: "$type"
      },
      status_code: {
        $max: "$status_code"
      },
      counts: {
        $push: {
          bot: "$_id.bot",
          count: "$count"
        }
      }
    }
  }
])

提供投入：

[
  {
    "ip": "66.249.79.181",
    "date": "2019-08-19T18:30:00.000Z",
    "request_url": "https://www.example.com/home",
    "status_code": "200",
    "bot": "Google Android",
    "type": "type/html",
    "domain": "https://www.example.com"
  },
  {
    "ip": "66.249.79.181",
    "date": "2019-08-19T18:30:00.000Z",
    "request_url": "https://www.example.com/home",
    "status_code": "200",
    "bot": "Google",
    "type": "type/html",
    "domain": "https://www.example.com"
  },
  {
    "ip": "66.249.79.181",
    "date": "2019-08-19T18:30:00.000Z",
    "request_url": "https://www.example.com/home",
    "status_code": "200",
    "bot": "bing",
    "type": "type/html",
    "domain": "https://www.example.com"
  }
]

输出为：

[
  {
    "_id": "https://www.example.com/home",
    "counts": [
      {
        "bot": "bing",
        "count": 1
      },
      {
        "bot": "Google",
        "count": 1
      },
      {
        "bot": "Google Android",
        "count": 1
      }
    ],
    "status_code": "200",
    "type": "type/html"
  }
]

以下查询可以获得预期的输出：

db.collection.aggregate([
    {
        $group:{
            "_id":{
                "request_url":"$request_url",
                "bot":"$bot"
            },
            "request_url":{
                $first:"$request_url"
            },
            "k":{
                $first:"$bot"
            },
            "v":{
                $sum:1
            }
        }
    },
    {
        $group:{
            "_id":"$request_url",
            "request_url":{
                $first:"$request_url"
            },
            "bots":{
                $push:{
                    "k":"$k",
                    "v":"$v"
                }
            }
        }
    },
    {
        $project:{
            "info.request_url":"$request_url",
            "bots":{
                $arrayToObject:"$bots"
            }
        }
    },
    {
        $project:{
            "info":{
                $mergeObjects:["$info","$bots"]
            }
        }
    },
    {
        $replaceRoot:{
            newRoot:"$info"
        }
    }
]).pretty()

数据集：

{
    "_id" : ObjectId("5d6d0f456bc2ad3b23f7dfcf"),
    "ip" : "66.249.79.181",
    "date" : "2019-08-19T18:30:00.000Z",
    "request_url" : "https://www.example.com/home",
    "status_code" : "200",
    "bot" : "Google Android",
    "type" : "type/html",
    "domain" : "https://www.example.com"
}
{
    "_id" : ObjectId("5d6d0f456bc2ad3b23f7dfd0"),
    "ip" : "66.249.79.181",
    "date" : "2019-08-19T18:30:00.000Z",
    "request_url" : "https://www.example.com/home",
    "status_code" : "200",
    "bot" : "Google",
    "type" : "type/html",
    "domain" : "https://www.example.com"
}
{
    "_id" : ObjectId("5d6d0f456bc2ad3b23f7dfd1"),
    "ip" : "66.249.79.181",
    "date" : "2019-08-19T18:30:00.000Z",
    "request_url" : "https://www.example.com/home",
    "status_code" : "200",
    "bot" : "bing",
    "type" : "type/html",
    "domain" : "https://www.example.com"
}

{
    "request_url" : "https://www.example.com/home",
    "bing" : 1,
    "Google" : 1,
    "Google Android" : 1
}

输出：

{
    "_id" : ObjectId("5d6d0f456bc2ad3b23f7dfcf"),
    "ip" : "66.249.79.181",
    "date" : "2019-08-19T18:30:00.000Z",
    "request_url" : "https://www.example.com/home",
    "status_code" : "200",
    "bot" : "Google Android",
    "type" : "type/html",
    "domain" : "https://www.example.com"
}
{
    "_id" : ObjectId("5d6d0f456bc2ad3b23f7dfd0"),
    "ip" : "66.249.79.181",
    "date" : "2019-08-19T18:30:00.000Z",
    "request_url" : "https://www.example.com/home",
    "status_code" : "200",
    "bot" : "Google",
    "type" : "type/html",
    "domain" : "https://www.example.com"
}
{
    "_id" : ObjectId("5d6d0f456bc2ad3b23f7dfd1"),
    "ip" : "66.249.79.181",
    "date" : "2019-08-19T18:30:00.000Z",
    "request_url" : "https://www.example.com/home",
    "status_code" : "200",
    "bot" : "bing",
    "type" : "type/html",
    "domain" : "https://www.example.com"
}

{
    "request_url" : "https://www.example.com/home",
    "bing" : 1,
    "Google" : 1,
    "Google Android" : 1
}

说明：数据在

请求url上分组，并计算不同的键值对。键（k）将保存bot名称，值（v）将保存发生计数。随后，将每一对放入一个数组，然后将数组转换为一个对象。
他指定了“使用morphia”。他指定了“使用morphia”。