Question

我想将csv文件导入到mongo集合中，但是，数据并不完全像我希望它在集合中。

我有以下csv文件:(简化）

city_id, city_name, street_id, street_name    
1,city1,1,street1
1,city1,2,street2
1,city1,3,street3
1,city1,4,street4
1,city1,5,street5
2,city2,1,street1
2,city2,2,street2
2,city2,3,street3
2,city2,4,street4
2,city2,5,street5
2,city2,6,street6
2,city2,7,street7

导入后，我希望导入的集合看起来像这样：

    {
        city_id: 1,
        city_name: "city1",
        streets: [
                    {
                     street_id: 1,
                     street_name: street1 
                    },
                    {
                     street_id: 2,
                     street_name: street2 
                    },
                    {
                     street_id: 3,
                     street_name: street3 
                    },
                    {
                     street_id: 4,
                     street_name: street4
                    },
                    {
                     street_id: 5,
                     street_name: street5
                    }
                ]
    },
    {
        city_id: 2,
        city_name: "city2",
        streets: [
                    {
                     street_id: 1,
                     street_name: street1 
                    },
                    {
                     street_id: 2,
                     street_name: street2 
                    },
                    {
                     street_id: 3,
                     street_name: street3 
                    },
                    {
                     street_id: 4,
                     street_name: street4
                    },
                    {
                     street_id: 5,
                     street_name: street5
                    },
                    {
                     street_id: 6,
                     street_name: street6
                    },
                    {
                     street_id: 7,
                     street_name: street7
                    }

                ]
    }

这可以通过相对简单的方式完成吗？

感谢您的帮助！

Answer 1

导入数据

mongoimport.exe /file:city.csv / type：csv / headerline

使用aggreagtion框架组合和重塑文件

db.city.aggregate([
{$group:{ 
    "_id":{"id":"$city_id","city_name":"$city_name" },
    "streets": { $push:  { street_id: "$street_id", street_name: "$street_name" } }
    }},
{$project:{
    "_id":0,
    "city_id":"$_id.id",
    "city_name":"$_id.city_name",
    "streets":1 
    }},
    {$out:"cities"}
])

检查城市集合中的搜索结果

从csv导入mongo集合，类似＆＃34; group by＆＃34;预先

1 个答案: