吴裕雄--天生自然 PYTHON3开发学习：MongoDB

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": "", "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": "" }
newvalues = { "$set": { "alexa": "" } }

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": "" } }

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()