Learn about MongoDB

Enter Mongodb:mongo

Exit Mongodb:exit

Show All libraries: Show DBS

Switch database: Use database name

View your library: DB

Delete Library: Db.dropdatabase ()

View a collection of current databases: Show collections

Collection creation: db.createcollection (name, options) collection name must be quoted

Delete collection: Db. Collection name. Drop ()

Insert data: DB. Collection name. Insert (document) #插入文档时, if you do not specify the _id parameter, MongoDB assigns the document a unique Objectid

Insert single: DB. Collection name. Insert ({name: ' Zhang San ', age:18})

Insert multiple: DB. collection name. Insert ([{name: ' Harry ', Sex: ' Male ', age:18}, {name: ' Zhang San ', Sex: ' Female ', age:30}, {name: ' John Doe ', Sex: ' Male ', age : 48}])

Query data: DB. Collection name. Find () #查询所有

Beauty query: Db. Collection name. Find (). Pretty ()

Update data: DB. Collection name. Update (condition),<update>) #单条更新

Multiple updates: DB. Collection name. Update ((condition), <update>, {multi:true})

Specifies the property update, through the operator $set:db. Collection name. Update (condition), {$set: <update>})

Delete data: Db. Collection name. Remove (condition) #默认删除所有

Delete Single: DB. Collection name. Remove ((condition), {justone:true})

Python Operation MongoDB

Install Python package: Pip install Pymongo

Introducing Package Pymongo:import Pymongo

Establish the connection and create the client: client= Pymongo. Mongoclient (host name, port) #本机 (' 127.0.0.1 ', 27017)

Specify database: db=client[database name]

Specified collection: col=db [collection name]

Common methods:

Learn about MongoDB