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法律研究如何在 MongoDB 中对内部数组进行排序？
您可以借助 MongoDB 中的聚合框架来实现此目的。为了理解它，让我们创建一个包含文档的集合。用于创建包含文档的集合的查询如下
> db.sortInnerArrayDemo.insertOne(
...
... {
... "EmployeeDetails":
... {
... "EmployeeAddress":
... {
... "EmployeeCountry":
... [
... {
... "EmployeeZipCode":1003,
... "EmployeeStreetName":"7885 Trusel Street"
... },
... {
... "EmployeeZipCode":1001,
... "EmployeeStreetName":"7390 Gonzales Drive"
... },
... {
... "EmployeeZipCode":1002,
... "EmployeeStreetName":"444 N.Myres Rd."
... }
... ]
... }
... }
... }
...
... );
{
"acknowledged" : true,
"insertedId" : ObjectId("5c6f07d3da34711ecf87a5b8")
}使用 find() 方法显示集合中的所有文档。查询如下
> db.sortInnerArrayDemo.find().pretty();
以下是输出
{
"_id" : ObjectId("5c6f07d3da34711ecf87a5b8"),
"EmployeeDetails" : {
"EmployeeAddress" : {
"EmployeeCountry" : [
{
"EmployeeZipCode" : 1003,
"EmployeeStreetName" : "7885 Trusel Street"
},
{
"EmployeeZipCode" : 1001,
"EmployeeStreetName" : "7390 Gonzales Drive"
},
{
"EmployeeZipCode" : 1002,
"EmployeeStreetName" : "444 N.Myres Rd."
}
]}
}
}以下是用于对内部数组进行排序的查询。
情况 1：按升序进行排序。
查询如下
> db.sortInnerArrayDemo.aggregate(
... {$unwind: '$EmployeeDetails.EmployeeAddress.EmployeeCountry'},
... {$sort: {'EmployeeDetails.EmployeeAddress.EmployeeCountry.EmployeeZipCode': 1}},
... {$group: {_id: '$_id', 'EmpCountry': {$push:
'$EmployeeDetails.EmployeeAddress.EmployeeCountry'}}},
... {$project: {'EmployeeDetails.EmployeeAddress.EmployeeCountry':
'$EmpCountry'}}).pretty();以下是输出，显示内部数组基于 EmployeeZipCode 按升序排序
{
"_id" : ObjectId("5c6f07d3da34711ecf87a5b8"),
"EmployeeDetails" : {
"EmployeeAddress" : {
"EmployeeCountry" : [
{
"EmployeeZipCode" : 1001,
"EmployeeStreetName" : "7390 Gonzales Drive"
},
{
"EmployeeZipCode" : 1002,
"EmployeeStreetName" : "444 N.Myres Rd."
},
{
"EmployeeZipCode" : 1003,
"EmployeeStreetName" : "7885 Trusel Street"
}
]
}
}
}情况 2：按降序进行排序
查询如下
> db.sortInnerArrayDemo.aggregate(
... {$unwind: '$EmployeeDetails.EmployeeAddress.EmployeeCountry'},
... {$sort: {'EmployeeDetails.EmployeeAddress.EmployeeCountry.EmployeeZipCode':-1}},
... {$group: {_id: '$_id', 'EmpCountry': {$push:
'$EmployeeDetails.EmployeeAddress.EmployeeCountry'}}},
... {$project: {'EmployeeDetails.EmployeeAddress.EmployeeCountry':
'$EmpCountry'}}).pretty();以下是输出，显示内部数组基于 EmployeeZipCode 按降序排序
{
"_id" : ObjectId("5c6f07d3da34711ecf87a5b8"),
"EmployeeDetails" : {
"EmployeeAddress" : {
"EmployeeCountry" : [
{
"EmployeeZipCode" : 1003,
"EmployeeStreetName" : "7885 Trusel Street"
},
{
"EmployeeZipCode" : 1002,
"EmployeeStreetName" : "444 N.Myres Rd."
},
{
"EmployeeZipCode" : 1001,
"EmployeeStreetName" : "7390 Gonzales Drive"
}
]
}
}
}
更新日期：2019-07-30
3 千以上的观看次数
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