【MongoDB】python操作MongoDB

一、模块的准备

1.1模块的安装

pip3 install pymongo

1.2可能用到的相关模块

from bson import ObjectId
from pymongo import MongoClient
from pymongo.cursor import Cursor

1.3数据库的连接

m_client = MongoClient("127.0.0.1",27017)

mdb = m_client["nbsu"]#连接数据库，如果指定的数据库不存在，会自动创建一个

二、用python操作 MogoDb 的增删改查操作

2.1 增

res =mdb.info.insert([{\'name\':\'小铭同学\'},{\'name\':\'小雪\'}])
print(res) #[ObjectId(\'5d2f1d3741ea8971fc7ec48d\'), ObjectId(\'5d2f1d3741ea8971fc7ec48e\')]
res =mdb.info.insert_one({\'name\':\'小铭同学\'})
print(res.inserted_id)#5d2f1dd0203c698a3a809f55
res =mdb.info.insert_many([{\'name\':\'小铭同学\'},{\'name\':\'小雪\'}])
print(res.inserted_ids) #[ObjectId(\'5d2f1dd0203c698a3a809f56\'), ObjectId(\'5d2f1dd0203c698a3a809f57\')]

2.2删

res = mdb.info.delete_one({\'name\':\'小雪\'})

2.3改

res = mdb.info.update_one({\'name\':\'小铭同学\'},{\'$set\':{"name":"hh"}})
# print(res.modified_count) #1
user = mdb.info.find_one({\'name\':\'小雪\'})
user[\'age\'] =19
user[\'hobby\'] =\'读书\'
# res= mdb.info.update_one({\'name\':\'hh\'},{\'$set\':user})
print(user)
res= mdb.info.update_one({\'name\':\'小雪\'},{\'$set\':{\'hobby\':user.get(\'hobby\')}})

2.4查

res =list(mdb.info.find())
print(res)  #[{\'_id\': ObjectId(\'5d2f1c8d8c31a48691fbe63d\'), \'name\': \'小铭同学\'}, {\'_id\': ObjectId(\'5d2f1c8d8c31a48691fbe63e\'), \'name\': \'小雪\'}]
#序列化的过程
for user in res:
    user["_id"] = str(user.get("_id"))
res_json = json.dumps(res)

三、排序及分页

res =mdb.info.find() 
# res_list =list(res.sort(\'age\',pymongo.DESCENDING))
# res_list =list(res.sort(\'age\',pymongo.DESCENDING).limit(3))
res_list =list(res.sort(\'age\',pymongo.DESCENDING).skip(2))
for s in res_list:
     print(s)


# 分页
res = list(res.sort("age",pymongo.ASCENDING).limit(2).skip(4))
print(res)