MongoDB Python - Insert and Replace Operations

MongoDB Python – Insert and Replace Operations

Difficulty Level : Easy
Last Updated : 03 Dec, 2020

Prerequisites : MongoDB Python Basics
This article focus on how to replace document or entry inside a collection. We can only replace the data already inserted in the database.
Method used : replace_one() and replace_many()
Aim: Replace entire data of old document with new document

Insertion In MongoDB

We would first insert data in MongoDB.

# Python code to illustrate 
# Insert in MongoDB 
from pymongo import MongoClient 
  
try: 
    conn = MongoClient() 
    print("Connected successfully!!!") 
except:   
    print("Could not connect to MongoDB") 
  
# database 
db = conn.database 
  
# Created or Switched to collection names: my_gfg_collection 
collection = db.my_gfg_collection 
  
emp_rec1 = { 
        "name":"Mr.Geek", 
        "eid":24, 
        "location":"delhi"
        } 
emp_rec2 = { 
        "name":"Mr.Shaurya", 
        "eid":14, 
        "location":"delhi"
        } 
emp_rec3 = { 
        "name":"Mr.Coder", 
        "eid":14, 
        "location":"gurugram"
        }  
  
# Insert Data 
rec_id1 = collection.insert_one(emp_rec1) 
rec_id2 = collection.insert_one(emp_rec2) 
rec_id3 = collection.insert_one(emp_rec3) 
print("Data inserted with record ids",rec_id1," ",rec_id2,rec_id3) 
  
# Printing the data inserted 
cursor = 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 employee whose name : Mr.Shaurya

# Python code to illustrate  
# Replace_one() in MongoDB 
from pymongo import MongoClient  
  
try: 
    conn = MongoClient() 
    print("Connected successfully!!!") 
except:   
    print("Could not connect to MongoDB") 
  
# database 
db = conn.database 
  
# Created or Switched to collection names: my_gfg_collection 
collection = db.my_gfg_collection 
  
# replace one of the employee data whose name is Mr.Shaurya 
result = collection.replace_one( 
        {"name":"Mr.Shaurya"}, 
        { 
                "name":"Mr.GfG", 
                "eid":45, 
                "location":"noida"
                  
                } 
        ) 
  
print("Data replaced with id",result) 
  
# Print the new record 
cursor = collection.find() 
for record in cursor: 
    print(record) 

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 new one, name:’Mr.GfG’ (present).

Replace_many()

Considering the data is same as inserted.
Replace all the data entries with eid:14.

# Python code to illustrate  
# Replace_many() in MongoDB 
from pymongo import MongoClient 
  
try: 
    conn = MongoClient() 
    print("Connected successfully!!!") 
except:   
    print("Could not connect to MongoDB") 
  
# database 
db = conn.database 
  
# Created or Switched to collection names: my_gfg_collection 
collection = db.my_gfg_collection 
  
# replace one of the employee data whose name is Mr.Shaurya 
result = collection.replace_many( 
        {"eid":14}, 
        { 
                "name":"Mr.GfG", 
                "eid":45, 
                "location":"noida"
                  
                } 
        ) 
  
print("Data replaced with id",result) 
  
# Print the new record 
cursor = collection.find() 
for record in cursor: 
    print(record) 

Output would have been:

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.GfG', 'eid': 45, 'location': 'noida'}

Here we can see both entries with eid:14 got replace with new data. (ObjectId will be different even if data is same).

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