Shulou(Shulou.com)06/01 Report--

1. View the database

Show dbs

two。 Create a runoob database

Use runoob

3. View collections in runoob

Show collections

4. Create address set (address_home,address_office)

Db.createCollection ("address_home")

Db.createCollection ("address_office")

5. View created collections

Show collections

6. Add data to the home (address_home) address set and the address_office address set, respectively

Db.address_home.insertOne ({

'name':'home address'

'province':'jiangsu'

'city':'xuzhou'

})

View address_home data

Db.address_home.find () .pretty ()

Db.address_office.insertOne ({

'name':'office address'

'province':'jiangsu'

'city':'nanjing'

})

View address_office data

Db.address_office.find () .pretty ()

7. Create a user collection (users)

Db.createCollection ("users")

8. View create collection

Show collections

9. Add data to the users collection

Db.users.insertOne ({

"name": "suyanzhu"

"address": {

"$ref": "address_home"

"$id": ObjectId ("5bd2b70fabb45c7371f36eda")

}

"age": 18

})

View the data in the collection

Db.users.find () .pretty ()

10. View the specific address information of the user

Var user = db.users.findOne ({"name": "suyanzhu"})

User

Var dbRef = user.address

DbRef

Var collName = dbRef.$ref

CollName

Var id = dbRef.$id

Id

DB [collName] .findOne ({"_ id": id})

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