mongodb与python的交互

pip3 intsall pymongo

import pymongo
from bson.objectid import ObjectId

创建mongo客户端链接

mongoConn = pymongo.MongoClient('localhost',27017)

第二种

mongoConn = pymongo.MongoClient('mongodb://localhost:27017/')

有账号和密码的连接

mongoConn = pymongo.MongoClient('mongodb://user:paw@localhost:27017/')

操作数据库下的集合

获取要操作的数据库

use_db = mongoConn.数据库名称

use_db = mongoConn.mongotest

use_db = mongoConn['mongotest']

获取数据库下要操作的集合

use_col = use_db.class1804

use_col = use_db['class1804']

文档操作

增

def add_data():
document = {
# '_id':'2e761r27e1' 指定id
'name':'liyong',
'age':20,
'gender':'男',
'class':'1804',
}
document1 = {
'name':'lihua',
'age':22,
'gender':'男',
'class':'1804',
}
#插入单条(result直接返回一个ｉｄ串)
# result = use_col.insert(document)
# use_col.insert_one(document)
#插入多条(result直接返回list(Object(...),Object(...))
result = use_col.insert([document,document1])
# use_col.insert_many([document,document1])
#也可以使用save
# use_col.save(document)
print(result)

删

def delete_data():
#删除一条
#result = use_col.delete_one({})
# result = use_col.remove({'name':'liyong'},multi=False)
# print(result)
#删除多条
# result = use_col.delete_many({})
#　multi=False删除一条，multi=True删除多条，
result = use_col.remove({'name':'liyong'})
print(result)

改

def update_data():
#默认情况下只修改一条
# result = use_col.update({'name':'liyong'},{'set':{'age':23}})
# print(result)
#　使用save做更新操作,全文档更新
#注意：name 'ObjectId' is not defined,导入Bson模块下的objectid
result = use_col.save({'_id':ObjectId("5b836b9711575e79be9af0c7"),'name':'wangwu'})

查

def find_data():
#　使用find查询，会返回一个ｃｕｒｓｏｒ对象，
#<pymongo.cursor.Cursor object at 0x7fa13d988e10>
# 我们要拿到数据，需要遍历
# result = use_col.find({'name':'liyong'})
# print(result)
# print([i for i in result])

result = use_col.find_one_and_delete()

# result = use_col.find_one_and_replace()
# result = use_col.find_one_and_update()

find_one查询时，直接返回一个字典

# result = use_col.find_one({'name':'liyong'}) 
# print(result)
# print(type(result))

跳过和限制查询s

# result = use_col.find({}).limit(4).skip(2).sort([("age",1),("name",1)])
result = use_col.find({}).limit(4).skip(2).sort("age",1).sort("name",1)
print([i for i in result])
# for dict in result:
# print(dict)

if name == 'main':
# add_data()
#update_data()
# find_data()
#delete_data()

# find_data()
#delete_data()