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 查询

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).

编程需要懂一点英语

示例 1：

样本数据库：

# 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': 'Maruti'}
  
# Using find_one_and_delete() function.
print("The returned document is:")
print(Collection.find_one_and_delete(Filter,
                                     projection = None,
                                     sort = None))
  
# 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：

# 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': 'Hyundai'}
  
# Using find_one_and_delete() function.
print("The returned document is:")
print(Collection.find_one_and_delete(Filter,
                                     projection = None,
                                     sort = None))
  
# 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：

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