MongoDB Descriptor Table Relationships

Mode one: Embedded

> Db.person.find ({name: ' ZJF '}). Pretty ()

{

"_id": ObjectId ("592ffd872108e8e79ea902b0"),

"Name": "ZJF",

"Age": 30,

"Address": {

"Province": "Henan Province",

"City": "Nanyang",

"Building": "Tongbai County"

}

}

the Address embed as an object into the person , it can also be an array here.

There is data redundancy in this way. And the address is written dead in person, for all person, their address is a separate, not can be shared as a class.

Mode two: quoted type

> Db.person.find ({name: ' Xhj '}). Pretty ()

{

"_id": ObjectId ("593011C8A92497992CDFAC10"),

"Name": "Xhj",

"Age": 30,

"Address": ObjectId ("59314b07e693aae7a5eb72ab")

}

> Db.address.find (). Pretty ()

{

"_id": ObjectId ("59314b07e693aae7a5eb72ab"),

"Province": "Henan Province",

"City": "Nanyang",

"Building": "Tongbai County"

}

Person is stored in the address point the reference. The disadvantage of this approach is that it takes a join to get all the data, but MongoDB does not support direct join syntax.

MongoDB Descriptor Table Relationships