import pymongo
 
myclient = pymongo.MongoClient("mongodb://localhost:27017/")
mydb = myclient["runoobdb"]

import pymongo
 
myclient = pymongo.MongoClient('mongodb://localhost:27017/')
 
dblist = myclient.list_database_names()
# dblist = myclient.database_names() 
if "runoobdb" in dblist:
  print("数据库已存在！")

import pymongo
 
myclient = pymongo.MongoClient("mongodb://localhost:27017/")
mydb = myclient["runoobdb"]
 
mycol = mydb["sites"]

import pymongo
 
myclient = pymongo.MongoClient('mongodb://localhost:27017/')
 
mydb = myclient['runoobdb']
 
collist = mydb. list_collection_names()
# collist = mydb.collection_names()
if "sites" in collist:   # 判断 sites 集合是否存在
  print("集合已存在！")

import pymongo
 
myclient = pymongo.MongoClient("mongodb://localhost:27017/")
mydb = myclient["runoobdb"]
mycol = mydb["sites"]
 
mydict = { "name": "RUNOOB", "alexa": "10000", "url": "https://www.runoob.com" }
 
x = mycol.insert_one(mydict) 
print(x)
print(x)

import pymongo
 
myclient = pymongo.MongoClient("mongodb://localhost:27017/")
mydb = myclient["runoobdb"]
mycol = mydb["sites"]
 
x = mycol.find_one()
 
print(x)

import pymongo
 
myclient = pymongo.MongoClient("mongodb://localhost:27017/")
mydb = myclient["runoobdb"]
mycol = mydb["sites"]
 
for x in mycol.find():
  print(x)

import pymongo
 
myclient = pymongo.MongoClient("mongodb://localhost:27017/")
mydb = myclient["runoobdb"]
mycol = mydb["sites"]
 
myquery = { "alexa": "10000" }
newvalues = { "$set": { "alexa": "12345" } }
 
mycol.update_one(myquery, newvalues)
 
# 输出修改后的  "sites"  集合
for x in mycol.find():
  print(x)

import pymongo
 
myclient = pymongo.MongoClient("mongodb://localhost:27017/")
mydb = myclient["runoobdb"]
mycol = mydb["sites"]
 
myquery = { "name": { "$regex": "^F" } }
newvalues = { "$set": { "alexa": "123" } }
 
x = mycol.update_many(myquery, newvalues)
 
print(x.modified_count, "文档已修改")

import pymongo
 
myclient = pymongo.MongoClient("mongodb://localhost:27017/")
mydb = myclient["runoobdb"]
mycol = mydb["sites"]
 
mydoc = mycol.find().sort("alexa")
for x in mydoc:
  print(x)

import pymongo
 
myclient = pymongo.MongoClient("mongodb://localhost:27017/")
mydb = myclient["runoobdb"]
mycol = mydb["sites"]
 
mydoc = mycol.find().sort("alexa", -1)
 
for x in mydoc:
  print(x)

import pymongo
 
myclient = pymongo.MongoClient("mongodb://localhost:27017/")
mydb = myclient["runoobdb"]
mycol = mydb["sites"]
 
myquery = { "name": "Taobao" }
 
mycol.delete_one(myquery)
 
# 删除后输出
for x in mycol.find():
  print(x)

import pymongo
 
myclient = pymongo.MongoClient("mongodb://localhost:27017/")
mydb = myclient["runoobdb"]
mycol = mydb["sites"]
 
myquery = { "name": {"$regex": "^F"} }
 
x = mycol.delete_many(myquery)
 
print(x.deleted_count, "个文档已删除")

import pymongo
 
myclient = pymongo.MongoClient("mongodb://localhost:27017/")
mydb = myclient["runoobdb"]
mycol = mydb["sites"]
 
x = mycol.delete_many({})
 
print(x.deleted_count, "个文档已删除")

import pymongo
 
myclient = pymongo.MongoClient("mongodb://localhost:27017/")
mydb = myclient["runoobdb"]
mycol = mydb["sites"]
 
mycol.drop()