Python MongoDB – find_one_and_delete 查询

MongoDB是一个跨平台的面向文档和非关系（即 NoSQL）的数据库程序。它是一个开源文档数据库，以键值对的形式存储数据。

find_one_and_delete()

此函数用于根据我们传递的过滤器从集合中删除单个文档，并从集合中返回已删除的文档。它找到与过滤器匹配的第一个匹配字段并将其从集合中删除，即找到单个文档并将其删除，返回该文档。

Syntax: Collection.find_one_and_delete(filter, projection=None, sort=None, session=None, **kwargs) 

Parameters:
‘filter’ : A query that matches the document to delete. 

‘projection’ (optional): A list of field names that should be returned in the 
result document or a mapping specifying the fields to include or exclude. If 
‘projection’ is a list “_id” will always be returned. Use a mapping to exclude 
fields from the result (e.g. projection={‘_id’: False}). 
‘

sort’ (optional): A list of (key, direction) pairs specifying the sort order for 
the query. If multiple documents match the query, they are sorted and the first is deleted. 

‘session’ (optional): A class: “~pymongo.client_session.ClientSession”. 
‘**kwargs’ (optional): Additional command arguments can be passed as keyword arguments 
  (for example maxTimeMS can be used with recent server versions). 
 

样本数据库：

我们操作的数据库。

示例 1：

Python3

# importing Mongoclient from pymongo
from pymongo import MongoClient
 
 
# Making Connection
myclient = MongoClient("mongodb://localhost:27017/")
 
# database
db = myclient["mydatabase"]
 
# Created or Switched to collection
# names: GeeksForGeeks
Collection = db["GeeksForGeeks"]
 
# Defining the filter that we want to use.
Filter ={'Manufacturer': 'Apple'}
 
# Using find_one_and_delete() function.
print("The returned document is:")
print(Collection.find_one_and_delete(Filter))
 
# Printing the data in the collection
# after find_one_and_delete() operation.
print("\nThe data after find_one_and_delete() operation is:")
 
for data in Collection.find():
    print(data)

输出 ：

示例 2：

在此示例中，我们使用 find_one_and_delete() 从数据库中删除 Redmi 数据：

Python3

# importing Mongoclient from pymongo
from pymongo import MongoClient
 
 
# Making Connection
myclient = MongoClient("mongodb://localhost:27017/")
 
# database
db = myclient["mydatabase"]
 
# Created or Switched to collection
# names: GeeksForGeeks
Collection = db["GeeksForGeeks"]
 
# Defining the filter that we want to use.
Filter ={'Manufacturer': 'Redmi'}
 
# Using find_one_and_delete() function.
print("The returned document is:")
print(Collection.find_one_and_delete(Filter)
 
# Printing the data in the collection
# after find_one_and_delete() operation.
print("\nThe data after find_one_and_delete() operation is:")
 
for data in Collection.find():
    print(data)

输出 ：