Python MongoDB Delete Document

Python MongoDB Delete Document

Python provides two useful methods to delete documents in a collection.

The delete_one() method is used to delete the first occurrence of the document (It is has more than one document in the result).

The delete_many() method is used to delete many documents in the result.

Both methods takes one arguments, which is:

  1. Query Object :- A query objective define which document to delete

We will take a sample collection called "emp" from "mydatabase" and it contains four columns ("id", "name", "city", and "salary") and five documents.

{'_id': 1, 'name': 'aa', 'city': 'berlin', 'salary': 2000}
{'_id': 2, 'name': 'bb', 'city': 'berlin', 'salary': 3500}
{'_id': 3, 'name': 'cc', 'city': 'new york', 'salary': 7000}
{'_id': 4, 'name': 'dd', 'city': 'paris', 'salary': 6000}
{'_id': 5, 'name': 'ee', 'city': 'berlin', 'salary': 1000}


Delete One Document - The delete_one() Method

We utilise the delete_one() method to remove a document.

Note : Only the first occurrence is erased when the query discovers more than one document.

Example :- Delete the "berlin" city of the document :

import pymongo
myclient = pymongo.MongoClient("mongodb://localhost:27017/")
mydb = myclient["mydatabase"]
mycol = mydb["emp"]
myquery = { "city": "berlin" }
mycol.delete_one(myquery)
for x in mycol.find():
  print(x)

Output :-

{'_id': 2, 'name': 'bb', 'city': 'berlin', 'salary': 3500}
{'_id': 3, 'name': 'cc', 'city': 'new york', 'salary': 7000}
{'_id': 4, 'name': 'dd', 'city': 'paris', 'salary': 6000}
{'_id': 5, 'name': 'ee', 'city': 'berlin', 'salary': 1000}

Note: There are three documents are selected by our query. But it deleted only the first document.

You can also search for these topics, python mongodb delete document entry, python key to delete document, locate the python mongodb delete document, working of document to delete in python, define the delete documents python properties, how to delete size of the delete document, unique and view of delete document using python.

Delete Many Documents - The delete_many() Method

Use the delete_many() function to remove more than one document.

Example :- Delete all documents where city="berlin" and salary < 6500 :

import pymongo
myclient = pymongo.MongoClient("mongodb://localhost:27017/")
mydb = myclient["mydatabase"]
mycol = mydb["emp"]
myquery = {"city": "berlin", "salary": {"$lt" : 6500} }
cnt = mycol.delete_many(myquery)
print(cnt.deleted_count, "documents deleted")
for x in mycol.find():
  print(x)

Output :-

2 documents deleted

{'_id': 3, 'name': 'cc', 'city': 'new york', 'salary': 7000}
{'_id': 4, 'name': 'dd', 'city': 'paris', 'salary': 6000}



You can also search for these topics, python delete all files, many document and folder in python mongodb directory, being used by another process the puthon mongodb, python delete many documents as local, list the deleted documents in python element, Example for python to delete many documents.

Delete All Documents in a Collection

Pass empty query objects on the delete_many() method to remove all documents in a collection :

Example :- Remove all documents in the collection "emp" :

import pymongo
myclient = pymongo.MongoClient("mongodb://localhost:27017/")
mydb = myclient["mydatabase"]
mycol = mydb["emp"]
x = mycol.delete_many({})
print(x.deleted_count, "documents deleted")

Output :-

2 documents deleted.



You can also search for these topics, python delete all document in a collection list, remove all files from python documents in a collection, python delete document but not directory, delete all contents and elements in a collection using python, python documents to delete all collection in folder, define the range of python all delete document, example for python delete all documents in a collection.