Javascript 如何使用node.js、mngodb将多个集合合并为一个集合?
我有4个系列,比如 分部 类别 产品组 产品 这些都是存储在集合中的我的数据 我的部门收集数据Javascript 如何使用node.js、mngodb将多个集合合并为一个集合?,javascript,node.js,mongodb,Javascript,Node.js,Mongodb,我有4个系列,比如 分部 类别 产品组 产品 这些都是存储在集合中的我的数据 我的部门收集数据 { "divisionid": "1", "divisioncode": "0", "divisionname": "ELECTRONICS/HOME APPLIANCE", "divisionpoint": "2" }, { "divisionid": "2", "divisioncode": "1", "divisionname": "F
{
"divisionid": "1",
"divisioncode": "0",
"divisionname": "ELECTRONICS/HOME APPLIANCE",
"divisionpoint": "2"
},
{
"divisionid": "2",
"divisioncode": "1",
"divisionname": "FOODS",
"divisionpoint": "8"
}
{
"categoryid": "1",
"divisionid": "1",
"categorycode": "34",
"categoryname": "AUDIO SYSTEM",
"categorypoint": "Null"
},
{
"categoryid": "2",
"divisionid": "1",
"categorycode": "348",
"categoryname": "DVD/VCD",
"categorypoint": "8"
}
{
"productgroupid": "1",
"divisionid": "1",
"categoryid": "1",
"productgroupname": "ADAPTOR",
"productgroupcode": "6765",
"productgrouppoint": "7"
},
{
"productgroupid": "2",
"divisionid": "1",
"categoryid": "2",
"productgroupname": "WALKMAN",
"productgroupcode": "7659",
"productgrouppoint": "Null"
}
{
"productid": "1",
"divisionid": "1",
"categoryid": "1",
"productgroupid":"1",
"productname":"UNIVERSAL AC DC ADAPTER-PCS",
"productcode": "1000054",
"productpoint": "1"
},
{
"productid": "2",
"divisionid": "1",
"categoryid": "2",
"productgroupid":"2",
"productname":"WALKMAN WM#M470-PCS",
"productcode": "1000089",
"productpoint": "2"
}
类别收集数据的
{
"divisionid": "1",
"divisioncode": "0",
"divisionname": "ELECTRONICS/HOME APPLIANCE",
"divisionpoint": "2"
},
{
"divisionid": "2",
"divisioncode": "1",
"divisionname": "FOODS",
"divisionpoint": "8"
}
{
"categoryid": "1",
"divisionid": "1",
"categorycode": "34",
"categoryname": "AUDIO SYSTEM",
"categorypoint": "Null"
},
{
"categoryid": "2",
"divisionid": "1",
"categorycode": "348",
"categoryname": "DVD/VCD",
"categorypoint": "8"
}
{
"productgroupid": "1",
"divisionid": "1",
"categoryid": "1",
"productgroupname": "ADAPTOR",
"productgroupcode": "6765",
"productgrouppoint": "7"
},
{
"productgroupid": "2",
"divisionid": "1",
"categoryid": "2",
"productgroupname": "WALKMAN",
"productgroupcode": "7659",
"productgrouppoint": "Null"
}
{
"productid": "1",
"divisionid": "1",
"categoryid": "1",
"productgroupid":"1",
"productname":"UNIVERSAL AC DC ADAPTER-PCS",
"productcode": "1000054",
"productpoint": "1"
},
{
"productid": "2",
"divisionid": "1",
"categoryid": "2",
"productgroupid":"2",
"productname":"WALKMAN WM#M470-PCS",
"productcode": "1000089",
"productpoint": "2"
}
productgroup集合数据的
{
"divisionid": "1",
"divisioncode": "0",
"divisionname": "ELECTRONICS/HOME APPLIANCE",
"divisionpoint": "2"
},
{
"divisionid": "2",
"divisioncode": "1",
"divisionname": "FOODS",
"divisionpoint": "8"
}
{
"categoryid": "1",
"divisionid": "1",
"categorycode": "34",
"categoryname": "AUDIO SYSTEM",
"categorypoint": "Null"
},
{
"categoryid": "2",
"divisionid": "1",
"categorycode": "348",
"categoryname": "DVD/VCD",
"categorypoint": "8"
}
{
"productgroupid": "1",
"divisionid": "1",
"categoryid": "1",
"productgroupname": "ADAPTOR",
"productgroupcode": "6765",
"productgrouppoint": "7"
},
{
"productgroupid": "2",
"divisionid": "1",
"categoryid": "2",
"productgroupname": "WALKMAN",
"productgroupcode": "7659",
"productgrouppoint": "Null"
}
{
"productid": "1",
"divisionid": "1",
"categoryid": "1",
"productgroupid":"1",
"productname":"UNIVERSAL AC DC ADAPTER-PCS",
"productcode": "1000054",
"productpoint": "1"
},
{
"productid": "2",
"divisionid": "1",
"categoryid": "2",
"productgroupid":"2",
"productname":"WALKMAN WM#M470-PCS",
"productcode": "1000089",
"productpoint": "2"
}
产品收集数据
{
"divisionid": "1",
"divisioncode": "0",
"divisionname": "ELECTRONICS/HOME APPLIANCE",
"divisionpoint": "2"
},
{
"divisionid": "2",
"divisioncode": "1",
"divisionname": "FOODS",
"divisionpoint": "8"
}
{
"categoryid": "1",
"divisionid": "1",
"categorycode": "34",
"categoryname": "AUDIO SYSTEM",
"categorypoint": "Null"
},
{
"categoryid": "2",
"divisionid": "1",
"categorycode": "348",
"categoryname": "DVD/VCD",
"categorypoint": "8"
}
{
"productgroupid": "1",
"divisionid": "1",
"categoryid": "1",
"productgroupname": "ADAPTOR",
"productgroupcode": "6765",
"productgrouppoint": "7"
},
{
"productgroupid": "2",
"divisionid": "1",
"categoryid": "2",
"productgroupname": "WALKMAN",
"productgroupcode": "7659",
"productgrouppoint": "Null"
}
{
"productid": "1",
"divisionid": "1",
"categoryid": "1",
"productgroupid":"1",
"productname":"UNIVERSAL AC DC ADAPTER-PCS",
"productcode": "1000054",
"productpoint": "1"
},
{
"productid": "2",
"divisionid": "1",
"categoryid": "2",
"productgroupid":"2",
"productname":"WALKMAN WM#M470-PCS",
"productcode": "1000089",
"productpoint": "2"
}
我想把这4个系列合并成一个系列
my expectation result:
productsummary
{
"product": {
"point": "1",
"name": "UNIVERSAL AC DC ADAPTER-PCS",
"code": "10000054",
"id" :"1"
},
"group": {
"point": "7",
"name": "ADAPTOR",
"id" :"1"
},
"category": {
"point": "0",
"name": "AUDIO SYSTEM",
"id" :"1"
},
"division": {
"point": "2",
"name": "ELECTRONICS/HOME APPLIANCE",
"id" :"1"
}
},
{
"product": {
"point": "2",
"name": "WALKMAN WM#M470-PCS",
"code": "1000089",
"id" :"2"
},
"group": {
"point": "7",
"name": "WALKMAN",
"id" :"Null"
},
"category": {
"point": "8",
"name": "DVD/VCD",
"id" :"2"
},
"division": {
"point": "2",
"name": "ELECTRONICS/HOME APPLIANCE",
"id" :"1"
}
}
当我执行下面的红色代码时,我得到了一个错误
您可以使用多个
$lookup
从多个集合中获取数据。假设您从产品集合运行查询。查询式
db.products.aggregate([
{$lookup:{from:"productgroups", localField:"productgroupid", foreignField:"productgroupid", as:"group"}},
{$lookup:{from:"category", localField:"categoryid", foreignField:"categoryid", as:"category"}},
{$lookup:{from:"divisions", localField:"divisionid", foreignField:"divisionid", as:"division"}},
{$project: {productpoint:1,productname:1,productcode:1,productid:1,group: { $arrayElemAt: [ "$group", 0 ]},
category: { $arrayElemAt: [ "$category", 0 ]}, division: { $arrayElemAt: [ "$division", 0 ]} }}
]);
然后您的输出将显示为
{
"_id" : ObjectId("58466154668bde730a460e1c"),
"productid" : "1",
"productname" : "UNIVERSAL AC DC ADAPTER-PCS",
"productcode" : "1000054",
"productpoint" : "1",
"group" : {
"_id" : ObjectId("5846612b668bde730a460e1a"),
"productgroupid" : "1",
"divisionid" : "1",
"categoryid" : "1",
"productgroupname" : "ADAPTOR",
"productgroupcode" : "6765",
"productgrouppoint" : "7"
},
"category" : {
"_id" : ObjectId("584660f8668bde730a460e18"),
"categoryid" : "1",
"divisionid" : "1",
"categorycode" : "34",
"categoryname" : "AUDIO SYSTEM",
"categorypoint" : "Null"
},
"division" : {
"_id" : ObjectId("584660a7668bde730a460e16"),
"divisionid" : "1",
"divisioncode" : "0",
"divisionname" : "ELECTRONICS/HOME APPLIANCE",
"divisionpoint" : "2"
}
}
如果您遇到任何问题,您可以通过聚合和查找参考资料来完成此操作。我是这项技术的新手,请您帮助我@VinodLouisi有6万种产品。上面的代码不起作用@Shaishab Royi先生,如果有大量数据,那么您可以使用
跳过和限制lookup
否则可能需要一些时间才能完成,一件重要的事情是你应该创建lookup
字段的index
,然后它会运行得更快。我如何做skip和limit?你能帮我吗?{$skip:skipValue},{$limit:limitValue}
然后{$lookup:…}