MongoDB 2.5, python interact with

2.5, python interact with

• Click to view the official documentation
• Install python package

进入虚拟环境
sudo pip install pymongo
或源码安装
python setup.py

• The introduction of package pymongo

import pymongo

类MongoClient

• Connection, create a client

无安全认证：client=pymongo.MongoClient('mongodb://localhost:27017')

有安全认证：client=pymongo.MongoClient('Mongodb: // username: password @localhost: 27017 / database name') 

类database

• Get the database test1

db=client.test1

类collection

• The main methods are as follows

1. insert_one()
2. insert_many()
3. update_one()
4. update_many()
5. delete_one()
6. delete_many()
7. find_one()
8. find()

• Gets a collection of stu

stu = db.stu

• Add a document, you can return the document id

s1={name:'gj',age:18}
s1_id = stu.insert_one(s1).inserted_id
print(s1_id)

• Modify the document

　　scores.update_one({'name':'zsf'},{'$set':{'name':'张三丰'}})

• Delete Document

　　scores.delete_one({'name':'zsf'})

• Find a document, convert the document to return a dictionary

K = stu.find_one ()

print (right) 
print (right [ 'Name']) 


K = stu.find_one ({ 'name', '张三丰'}) 
the printer (right) 
print (right [ 'Name'])

• 1 when looking for multiple documents, returns an object of type Cursor, used to traverse, traverse, each document returned as a dictionary

cursor = stu.find()
for s in cursor:
    print(s)
    print(s['name'])

cursor = stu.find({'name':'张三丰'})
for s in cursor:
    print(s)
    print(s['name'])

• Find more documents 2

cur=stu.find()
cur.next()
cur.next()
cur.next()

• Gets the number of documents

print stu.count()

• Sort, returns an object of type cursor
• Used in ascending order ASCENDING, descending use DESCENDING:

Single property: cur = stu.find () sort ( 'age', DESCENDING).

Multiple Attribute: cur = stu.find () sort ([( 'age', DESCENDING), ( 'name', ASCENDING)]).

• Child Collection

cur=stu.find().skip(2).limit(3)

# -*- coding:utf-8 -*-
# @Time : 2020/1/29 23:16
# @Author : xxxx
# @File : test1_mongodb.py
# @Software: PyCharm

import pymongo

DEF test0 ():
     # get the client to establish a connection 
    CLI = pymongo.MongoClient ( ' MongoDB: // localhost: 27017 ' )
     # switching database 
    DB = cli.liuyan
     # Get set 
    Scores = db.scores

    # Add 
    scores.insert_one ({ ' name ' : ' Zhang Yifeng ' })

    # Delete 
    scores.delete_one ({ ' name ' : ' Zhang Yifeng ' })

    # Modify 
    scores.update_one ({ ' name ' : ' ZSF ' }, { ' $ SET ' : { ' name ' : ' Chi Master ' }})

DEF test1 ():
     # get the client to establish a connection 
    CLI = pymongo.MongoClient ( ' MongoDB: // localhost: 27017 ' )
     # switching database 
    DB = cli.liuyan
     # Get set 
    Scores = db.scores

    # 查询 
    K = scores.find_one ()
     print (right)
     the printer (right [ ' Name ' ])

DEF test2 ():
     # get the client to establish a connection 
    CLI = pymongo.MongoClient ( ' MongoDB: // localhost: 27017 ' )
     # switching database 
    DB = cli.liuyan
     # Get set 
    Scores = db.scores

    # Query 
    RET = scores.find_one ({ ' name ' : ' Chi Master ' })
     Print (RET)
     Print (RET [ ' name ' ])

DEF Test3 ():
     # get the client to establish a connection 
    CLI = pymongo.MongoClient ( ' MongoDB: // localhost: 27017 ' )
     # switching database 
    DB = cli.liuyan
     # Get set 
    Scores = db.scores

    # 查询
    cursor = scores.find()
    for s in cursor:
        print(s)
        print(s['name'])

DEF Test4 ():
     # get the client to establish a connection 
    CLI = pymongo.MongoClient ( ' MongoDB: // localhost: 27017 ' )
     # switching database 
    DB = cli.liuyan
     # Get set 
    Scores = db.scores

    # Query 
    Cursor = scores.find ({ ' name ' : ' Chi Master ' })
     for S in Cursor:
         Print (S)
         Print (S [ ' name ' ])

DEF Test5 ():
     # get the client to establish a connection 
    CLI = pymongo.MongoClient ( ' MongoDB: // localhost: 27017 ' )
     # switching database 
    DB = cli.liuyan
     # Get set 
    Scores = db.scores

    # 查询
    # ret = scores.find({'age':{'$gt':20}})
    # for s in ret:
    #     print(s['name'])

DEF test6 ():
     # get the client to establish a connection 
    CLI = pymongo.MongoClient ( ' MongoDB: // localhost: 27017 ' )
     # switching database 
    DB = cli.liuyan
     # Get set 
    Scores = db.scores

    # 查询、排序
    # cursor = scores.find().sort('name', pymongo.DESCENDING)
    cursor = scores.find().sort([('name', pymongo.DESCENDING), ('age', pymongo.ASCENDING)])
    for s in cursor:
        # print(s)
        print(s['name'])

if __name__ == '__main__':
    # test0()
    # test1()
    # test2()
    # test3()
    # test4()
    # test5()
    test6()