A document in MongoDB is the same as a record in SQL databases.
Insert Into Collection
To insert a record, or document as it is called in MongoDB, into a collection, we use the insert_one[]
method.
The first parameter of the insert_one[]
method is a dictionary containing the name[s] and value[s] of each field in the document you want to insert.
Example
Insert a record in the "customers" collection:
import pymongo
myclient = pymongo.MongoClient["mongodb://localhost:27017/"]
mydb = myclient["mydatabase"]
mycol = mydb["customers"]
mydict = { "name": "John", "address": "Highway 37" }
x = mycol.insert_one[mydict]
Run example »
Return the _id Field
The insert_one[]
method returns a InsertOneResult object,
which has a property, inserted_id
, that holds the id of the inserted document.
Example
Insert another record in the "customers" collection, and return the value of the _id
field:
mydict = { "name": "Peter", "address": "Lowstreet 27" }
x = mycol.insert_one[mydict]
print[x.inserted_id]
Run example »
If you do not specify
an _id
field, then MongoDB will add one for you and assign a unique id for each document.
In the example above no _id
field was specified, so MongoDB assigned a unique _id for the record [document].
Insert Multiple Documents
To insert multiple documents into a collection in MongoDB, we use the insert_many[]
method.
The first parameter of the insert_many[]
method is a list containing dictionaries with the data you want to insert:
Example
import pymongo
myclient = pymongo.MongoClient["mongodb://localhost:27017/"]
mydb = myclient["mydatabase"]
mycol = mydb["customers"]
mylist = [
{ "name": "Amy", "address": "Apple st 652"},
{ "name": "Hannah", "address": "Mountain 21"},
{ "name": "Michael", "address": "Valley 345"},
{ "name": "Sandy", "address": "Ocean blvd 2"},
{ "name": "Betty", "address": "Green Grass 1"},
{ "name": "Richard", "address": "Sky st
331"},
{ "name": "Susan", "address": "One way 98"},
{ "name": "Vicky", "address": "Yellow Garden 2"},
{ "name": "Ben", "address": "Park Lane 38"},
{ "name": "William", "address": "Central st 954"},
{ "name": "Chuck", "address": "Main Road 989"},
{ "name": "Viola", "address": "Sideway 1633"}
]
x = mycol.insert_many[mylist]
#print list of the _id values of the inserted documents:
print[x.inserted_ids]
Run example »
The insert_many[]
method returns a InsertManyResult object, which has a property, inserted_ids
, that holds the ids of the inserted documents.
Insert Multiple Documents, with Specified IDs
If you do not want MongoDB to assign unique ids for you document, you can specify the _id field when you insert the document[s].
Remember that the values has to be unique. Two documents cannot have the same _id.
Example
import pymongo
myclient = pymongo.MongoClient["mongodb://localhost:27017/"]
mydb = myclient["mydatabase"]
mycol = mydb["customers"]
mylist = [
{ "_id": 1, "name": "John", "address": "Highway 37"},
{ "_id": 2, "name": "Peter", "address": "Lowstreet 27"},
{ "_id": 3, "name": "Amy", "address": "Apple st 652"},
{ "_id": 4, "name": "Hannah", "address":
"Mountain 21"},
{ "_id": 5, "name": "Michael", "address": "Valley 345"},
{ "_id": 6, "name": "Sandy", "address": "Ocean blvd 2"},
{ "_id": 7, "name": "Betty", "address": "Green Grass 1"},
{ "_id": 8, "name": "Richard", "address": "Sky st 331"},
{ "_id": 9, "name": "Susan", "address": "One way 98"},
{ "_id": 10, "name": "Vicky", "address": "Yellow Garden 2"},
{ "_id": 11, "name": "Ben", "address": "Park Lane 38"},
{
"_id": 12, "name": "William", "address": "Central st 954"},
{ "_id": 13, "name": "Chuck", "address": "Main Road 989"},
{ "_id": 14, "name": "Viola", "address": "Sideway 1633"}
]
x = mycol.insert_many[mylist]
#print list of the _id values of the inserted documents:
print[x.inserted_ids]
Run example »
Prerequisites : MongoDB Python Basics We would first understand how to insert a document/entry in a collection of a database. Then we would work on how to update an existing document in MongoDB using pymongo library in python. The update commands helps us to update the query data inserted already in MongoDB database collection.
Insert data
We would first insert data in MongoDB.
- Step 1 – Establishing Connection: Port number Default: 27017
conn = MongoClient[‘localhost’, port-number]
- If using default port-number i.e. 27017. Alternate connection method:
conn = MongoClient[]
- Step 2 – Create Database or Switch to Existing Database:
db = conn.dabasename
- Create a collection or Switch to existing collection:
collection = db.collection_name
- Step 3 – Insert : To Insert Data create a dictionary object and insert data in database. Method used to insert data:
insert_one[] or insert_many[]
- After insert to find the documents inside a collection we use find[] command. The find[] method issues a query to retrieve data from a collection in MongoDB. All queries in MongoDB have the scope of a single collection. Note : ‘_id’ is different for every entry in database collection. Let us understand insert of data with help on code:-
Python3
from
pymongo
import
MongoClient
try
:
conn
=
MongoClient[]
print
[
"Connected successfully!!!"
]
except
:
print
[
"Could not connect to MongoDB"
]
db
=
conn.database
collection
=
db.my_gfg_collection
emp_rec1
=
{
"name"
:
"Mr.Geek"
,
"eid"
:
24
,
"location"
:
"delhi"
}
emp_rec2
=
{
"name"
:
"Mr.Shaurya"
,
"eid"
:
14
,
"location"
:
"delhi"
}
rec_id1
=
collection.insert_one[emp_rec1]
rec_id2
=
collection.insert_one[emp_rec2]
print
[
"Data inserted with record ids"
,rec_id1,
" "
,rec_id2]
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'}
Updating data in MongoDB
Methods used: update_one[] and update_many[] Parameters passed: + a filter document to match the documents to update + an update document to specify the modification to perform + an optional upsert parameter After inserting Data in MongoDB let’s Update the Data of employee with id:24
Python3
from
pymongo
import
MongoClient
try
:
conn
=
MongoClient[]
print
[
"Connected successfully!!!"
]
except
:
print
[
"Could not connect to MongoDB"
]
db
=
conn.database
collection
=
db.my_gfg_collection
result
=
collection.update_many[
{
"eid"
:
24
},
{
"$set"
:{
"name"
:
"Mr.Geeksforgeeks"
},
"$currentDate"
:{
"lastModified"
:
True
}
}
]
print
[
"Data updated with id"
,result]
cursor
=
collection.find[]
for
record
in
cursor:
print
[record]
Output:
Connected successfully!!! Data updated with id {'_id': ObjectId['5a02227b37b8552becf5ed2a'], 'name': 'Mr.Geeksforgeeks', 'eid': 24, 'location': 'delhi', 'lastModified': datetime.datetime[2017, 11, 7, 21, 19, 9, 698000]} {'_id': ObjectId['5a02227c37b8552becf5ed2b'], 'name': 'Mr.Shaurya', 'eid': 14, 'location': 'delhi'}
To find number of documents or entries in collection the are updated use.
print[result.matched_count]
Here output would be 1.