python增删改查mongodb

Python操作MongoDB的增删改查方法如下：

1. 连接MongoDB数据库

使用pymongo库连接MongoDB数据库，代码如下：

import pymongo

client = pymongo.MongoClient("mongodb://localhost:27017/")
db = client["mydatabase"]

2. 插入数据

使用insert_one()或insert_many()方法向MongoDB数据库中插入一条或多条数据，代码如下：

# 插入单条数据
mycollection = db["customers"]
mydict = { "name": "John", "address": "Highway 37" }
x = mycollection.insert_one(mydict)

# 插入多条数据
mylist = [
  { "name": "Amy", "address": "Apple st 652"},
  { "name": "Hannah", "address": "Mountain 21"},
  { "name": "Michael", "address": "Valley 345"},
  { "name": "Sandy", "address": "Ocean blvd 2"},
  { "name": "Betty", "address": "Green Grass 1"},
  { "name": "Richard", "address": "Sky st 331"}
]
x = mycollection.insert_many(mylist)

3. 查询数据

使用find()方法查询MongoDB数据库中的数据，代码如下：

# 查询所有数据
for x in mycollection.find():
  print(x)

# 查询指定数据
myquery = { "address": "Park Lane 38" }
mydoc = mycollection.find(myquery)
for x in mydoc:
  print(x)

4. 更新数据

使用update_one()或update_many()方法更新MongoDB数据库中的数据，代码如下：

# 更新单条数据
myquery = { "address": "Valley 345" }
newvalues = { "$set": { "address": "Canyon 123" } }
mycollection.update_one(myquery, newvalues)

# 更新多条数据
myquery = { "address": { "$regex": "^S" } }
newvalues = { "$set": { "name": "Minnie" } }
x = mycollection.update_many(myquery, newvalues)

5. 删除数据

使用delete_one()或delete_many()方法删除MongoDB数据库中的数据，代码如下：

# 删除单条数据
myquery = { "address": "Mountain 21" }
mycollection.delete_one(myquery)

# 删除多条数据
myquery = { "address": {"$regex": "^S"} }
x = mycollection.delete_many(myquery)