MongoDB Python – Insert and Replace Operations

20 Jun, 2022
This article focus on how to replace document or entry inside a collection. We can only replace the data already inserted in the database.
Prerequisites : MongoDB Python Basics 
Method used: replace_one() Aim: Replace entire data of old document with a new document
Insertion In MongoDB
We would first insert data in MongoDB. 
Python3
# Python code to illustrate# Insert in MongoDBfrom pymongo import MongoClient try:    conn = MongoClient()    print(& quot           Connected successfully!!!& quot           )except:    print(& quot           Could not connect to MongoDB & quot           ) # databasedb = conn.database # Created or Switched to collection names: my_gfg_collectioncollection = db.my_gfg_collection emp_rec1 = {    & quot    name & quot: & quot    Mr.Geek & quot,    & quot    eid & quot: 24,    & quot    location & quot: & quot    delhi & quot}emp_rec2 = {    & quot    name & quot: & quot    Mr.Shaurya & quot,    & quot    eid & quot: 14,    & quot    location & quot: & quot    delhi & quot}emp_rec3 = {    & quot    name & quot: & quot    Mr.Coder & quot,    & quot    eid & quot: 14,    & quot    location & quot: & quot    gurugram & quot} # Insert Datarec_id1 = collection.insert_one(emp_rec1)rec_id2 = collection.insert_one(emp_rec2)rec_id3 = collection.insert_one(emp_rec3)print(& quot       Data inserted with record ids", rec_id1, & quot       & quot       , rec_id2, rec_id3) # Printing the data insertedcursor = collection.find()for record in cursor:    print(record)
Output:
Connected successfully!!!
Data inserted with record ids    
{'_id': ObjectId('5a02227b37b8552becf5ed2a'), 'name': 
'Mr.Geek', 'eid': 24, 'location': 'delhi'}
{'_id': ObjectId('5a02227c37b8552becf5ed2b'), 'name': 
'Mr.Shaurya', 'eid': 14, 'location': 'delhi'}
{'_id': ObjectId('5a02227c37b8552becf5ed2c'), 'name': 
'Mr.Coder', 'eid': 14, 'location': 'gurugram'}
Replace_one()
After inserting the data let’s replace the Data of an employee whose name: Mr.Shaurya 
Matlab
# Python code to illustrate# Replace_one() in MongoDBfrom pymongo import MongoClient try:    conn = MongoClient()    print("Connected successfully!!!")except:     print("Could not connect to MongoDB") # databasedb = conn.database # Created or Switched to collection names: my_gfg_collectioncollection = db.my_gfg_collection # replace one of the employee data whose name is Mr.Shauryaresult = collection.replace_one(        {"name":"Mr.Shaurya"},        {                "name":"Mr.GfG",                "eid":45,                "location":"noida"                                 }        ) print("Data replaced with id",result) # Print the new recordcursor = collection.find()for record in cursor:    print(record)
Output:
Connected successfully!!!
Data replaced with id 
{'_id': ObjectId('5a02227b37b8552becf5ed2a'), 'name': 
'Mr.Geek', 'eid': 24, 'location': 'delhi'}
{'_id': ObjectId('5a02227c37b8552becf5ed2b'), 'name': 
'Mr.GfG', 'eid': 45, 'location': 'noida'}
{'_id': ObjectId('5a02227c37b8552becf5ed2c'), 'name': 
'Mr.Coder', 'eid': 14, 'location': 'gurugram'}
We have successfully replaced the document of employee name:’Mr.Shaurya’ and replaced the entire document with a new one, name:’Mr.GfG’ (present).
To replace multiple documents use update_many() with upsert set to True.
khushb99
Python-mongoDB
Python
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