Using MongoDB in Python

The MongoDB hierarchy is database-->collection--and document

Installing MongoDB, starting the MONGO service

Installing the Python MONGO module

Pip Install Pymongo

View after installation

PIP List

Module reference

Import Pymongo

Establish a connection

Import Pymongo  from Import  = mongoclient ('localhost', 27017)#client = mongoclient ( ' mongodb://localhost:27017 ')

Accessing the database

The users of the database test currently in use

db == db.users# or db = client[' users ']

Insert Document

A document is a row, and a collection is a table

A Insert_one ()

User1 = {"name":"li8","Age": 8  = users.insert_one (user1)print('oneinsert:{0}'. Format (rs.inserted_id))

Multiple Insert_many ()

User2 = {"name":"Li9"," Age": 9}user3= {"name":"li10"," Age": 10}user4= {"name":"li11"," Age": 11}user5= {"name":"li12"," Age": 12}new_result=Users.insert_many ([User2, User3, User4, User5])Print('multiple users: {0}'. Format (New_result.inserted_ids))

Retrieving documents

A Find_one ()

Usertmp = Users.find_one ({"Age":)print(usertmp)

Multiple find ()

rs = users.find ({'age': +}) for in rs:    Print (TMP)

Advanced Query

rs = users.find ({'age': {"$lt": +}}). Sort ("  Name") for in rs:    print(TMP)

Number of statistics

Print (Users.count ())

Add index

 from Import Ascending, descending Print (Users.create_index ("Age", Descending), ("name", Ascending)])

Mongoengine is an Object document Mapper (ODM), equivalent to an SQL-based object-relational mapper (ORM)

The abstraction provided by Mongoengine is class-based, and all models created are classes

Installation

Pip Install Mongoengine

Use

 fromMongoengineImport*Connect ('Test', host='localhost', port=27017)ImportdatetimeclassUsers (Document): Name= Stringfield (Required=true, max_length=200) Age= Intfield (required=True) Users=Users.objects.all () forUinchUsers:Print("Name:", U.name,", Age:", U.age)

Save

 fromMongoengineImport*Connect ('Test', host='localhost', port=27017)ImportdatetimeclassUsers (Document): Name= Stringfield (Required=true, max_length=200) Age= Intfield (required=True) User1=Users (Name='ZZ', Age= 11) User1.save ()Print(user1.name) user1.name='Zz11'User1.save ()Print(User1.name)

Using MongoDB in Python